Merge pull request #5935 from koba1t/pinToCmdConfig

Update cmd/config to v0.20.0

.dockerignore

@@ -0,0 +1,5 @@
+.github
+docs
+examples
+travis
+*.md

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -0,0 +1,87 @@
+name: Bug report
+description: File a bug report
+labels: ["kind/bug"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: What happened?
+      description: |
+        Please provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner.
+        If this matter is security related, please disclose it privately via https://kubernetes.io/security
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: repro-files
+    attributes:
+      label: How can we reproduce it (as minimally and precisely as possible)?
+      description: Please provide a minimum set of files that can reproduce the issue. You can paste the file contents here or provide a link to a tarball or git repo. Even better, submit a tests case in the api/krusty package! For more information on how to do that, see https://kubectl.docs.kubernetes.io/contributing/kustomize/bugs/.
+      value: | 
+        ```yaml
+        # kustomization.yaml
+        apiVersion: kustomize.config.k8s.io/v1beta1
+        kind: Kustomization
+        resources:
+        - resources.yaml
+        ```
+    
+        ```yaml
+        # resources.yaml
+        apiVersion: v1
+        kind: ConfigMap
+        metadata:
+          name: test-object
+        data:
+          placeholder: data
+        ```
+    validations:
+      required: true  
+  - type: textarea
+    id: expected-output
+    attributes:
+      label: Expected output
+      description: If you are able to provide reproduction files, please include the output you expect here.
+      value: | 
+        ```yaml
+
+        ```
+    validations:
+      required: false
+  - type: textarea
+    id: actual-output
+    attributes:
+      label: Actual output
+      description: If you are able to provide reproduction files, please include the output they currently produce here.
+      value: | 
+        ```yaml
+
+        ```
+    validations:
+      required: false
+  - type: input
+    id: kustomize-version
+    attributes:
+      label: Kustomize version
+      description: Please use the latest version whenever possible.
+      placeholder: What version of Kustomize are you using?
+    validations:
+      required: true
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating system
+      options:
+        - Linux
+        - MacOS
+        - Windows
+        - Other
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,6 @@
+contact_links:
+  - name: Support request
+    url: https://discuss.kubernetes.io
+    about: |
+      Please do not submit support requests or questions as issues. 
+      Ask your question in the Kubernetes Community Forums, or in the #kustomize channel on Kubernetes Slack (https://slack.k8s.io).

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -0,0 +1,64 @@
+name: Feature request
+description: Propose an enhancement to Kustomize
+labels: kind/feature
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Small, straightforward enhancements can be proposed in regular GitHub issues using the template below. As a rule of thumb, the enhancement should be resolvable in a single PR that is at most size L. Anything more involved requires a mini (in-repo) enhancement proposal, and features with implications for kubectl require a full [KEP](https://github.com/kubernetes/enhancements). 
+         
+        For more information on the Kustomize enhancement process, see: https://github.com/kubernetes-sigs/kustomize/tree/master/proposals.      
+         
+        When in doubt, go ahead and fill out the template below; the maintainers will let you know if a KEP is required.
+
+  - type: checkboxes
+    attributes:
+      label: Eschewed features
+      description: Some features are out of scope for Kustomize because they are incompatible with its foundational design principles. Please review the [Eschewed Features](https://kubectl.docs.kubernetes.io/faq/kustomize/eschewedfeatures/) documentation before submitting your feature request.
+      options:
+      - label: This issue is not requesting templating, unstuctured edits, build-time side-effects from args or env vars, or any other eschewed feature.
+        required: true
+
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: What would you like to have added?
+    validations:
+      required: true
+
+  - type: textarea
+    id: rationale
+    attributes:
+      label: Why is this needed?
+    validations:
+      required: true
+      
+  - type: textarea
+    id: current-alternatives
+    attributes:
+      label: Can you accomplish the motivating task without this feature, and if so, how?
+    validations:
+      required: true      
+      
+      
+  - type: textarea
+    id: design-alternatives
+    attributes:
+      label: What other solutions have you considered?
+    validations:
+      required: true        
+
+  - type: textarea
+    id: additional-info
+    attributes:
+      label: Anything else we should know?
+    validations:
+      required: false
+      
+  - type: checkboxes
+    attributes:
+      label: Feature ownership
+      description: The Kustomize project, like many areas of Kubernetes, currently lacks enough contributors to adequately respond to all proposals that have merit. Offering to build and support the feature yourself can help get traction for your request.
+      options:
+      - label: I am interested in contributing this feature myself! 🎉
+        required: false

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+      interval: "weekly"
+
+- package-ecosystem: gomod
+  directory: "/"
+  schedule:
+    interval: "weekly"
+  open-pull-requests-limit: 10
+  vulnerability-alerts:
+    enabled: true

.github/workflows/apidiff.yml

@@ -0,0 +1,36 @@
+name: APIDiff
+
+# Trigger the workflow on pull requests and direct pushes to any branch
+on:
+  push:
+  pull_request:
+
+jobs:
+  go-apidiff:
+    name: Verify API differences
+    runs-on: ubuntu-latest
+    # Pull requests from different repository only trigger this checks
+    if: (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository)
+    steps:
+      - name: Clone the code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.work
+      - name: Execute go-apidiff
+        uses: joelanford/go-apidiff@v0.8.3
+        with:
+          compare-imports: true
+          print-compatible: true
+      - name: Report failure
+        uses: nashmaniac/create-issue-action@v1.2
+        # Only report failures of pushes (PRs have are visible through the Checks section) to the default branch
+        if: failure() && github.event_name == 'push' && github.ref == 'refs/heads/master'
+        with:
+          title: 🐛 go-apidiff failed for ${{ github.sha }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          labels: kind/bug
+          body: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}

.github/workflows/go.yml

@@ -1,28 +1,130 @@
-name: Go
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-    steps:
-
-    - name: Set up Go 1.x
-      uses: actions/setup-go@v2
-      with:
-        go-version: ^1.13
-      id: go
-
-    - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
-
-    - name: Build
-      run: ./travis/kyaml-pre-commit.sh
-      env:
-        KUSTOMIZE_DOCKER_E2E: true
+name: Go
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+permissions:
+  contents: read
+
+jobs:
+  conditional-changes:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: read
+    outputs:
+      doc: ${{ steps.filter.outputs.doc }}
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dorny/paths-filter@v3
+      id: filter
+      with:
+        filters: |
+          doc:
+            - 'site/**'
+
+  check-modules:
+    name: check-synced-go-modules
+    needs: conditional-changes
+    # if: needs.conditional-changes.outputs.doc == 'false'
+    runs-on: [ubuntu-latest]
+    steps:
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: go.work
+      id: go
+    - name: sync go modules
+      run: make workspace-sync
+    - name: check for changes with 'make workspace-sync'
+      run: git diff --exit-code
+
+  lint:
+    name: Lint
+    needs: conditional-changes
+    # if: needs.conditional-changes.outputs.doc == 'false'
+    runs-on: [ubuntu-latest]
+    steps:
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: go.work
+      id: go
+    - name: Lint
+      run: make lint
+    - name: Verify boilerplate
+      run: make check-license
+
+  test-linux:
+    name: Test Linux
+    needs: conditional-changes
+    # if: needs.conditional-changes.outputs.doc == 'false'
+    runs-on: [ubuntu-latest]
+    steps:
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v4
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: go.work
+      id: go
+    - name: Test all modules
+      run: make test-unit-non-plugin
+      env:
+        KUSTOMIZE_DOCKER_E2E: true
+
+  test-macos:
+    name: Test MacOS
+    needs: conditional-changes
+    # if: needs.conditional-changes.outputs.doc == 'false'
+    runs-on: [macos-latest]
+    steps:
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v4
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: go.work
+      id: go
+    - name: Test all modules
+      run: make test-unit-non-plugin
+      env:
+        KUSTOMIZE_DOCKER_E2E: false # docker not installed on mac
+
+  test-windows:
+    name: Test Windows
+    needs: conditional-changes
+    # if: needs.conditional-changes.outputs.doc == 'false'
+    runs-on: [windows-latest]
+    steps:
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v4
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: go.work
+      id: go
+    - name: Test kyaml
+      run: go test -cover ./...
+      working-directory: ./kyaml
+    - name: Test cmd/config
+      run: go test -cover ./...
+      working-directory: ./cmd/config
+      env:
+        KUSTOMIZE_DOCKER_E2E: false # docker on windows not working well yet
+
+    # TODO (#4001): replace specific modules above with this once Windows tests are passing.
+    #- name: Test all modules
+    #  run: make test-unit-non-plugin
+    #  env:
+    #    KUSTOMIZE_DOCKER_E2E: false # docker on windows not working well yet

.github/workflows/release.yaml

@@ -0,0 +1,30 @@
+name: release
+
+permissions:
+  contents: write # Allow actions to update dependabot PRs
+
+on:
+  push:
+    tags:
+      - kyaml/v*
+      - cmd/config/v*
+      - api/v*
+      - kustomize/v*
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: go.work
+      id: go
+    - run: ./releasing/create-release.sh "${tag}"
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        tag: ${{ github.ref_name }}

.gitignore

@@ -19,3 +19,16 @@
 
 # macOS
 *.DS_store
+
+.bin
+
+# Hugo site
+publishedSite/
+site/public/
+site/resources/
+site/.hugo_build.lock
+**/node_modules/
+
+# goreleaser artifacts
+**/dist/
+/output/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "site/themes/docsy"]
+	path = site/themes/docsy
+	url = https://github.com/google/docsy.git

.golangci-kustomize.yml

@@ -1,50 +0,0 @@
-run:
-  deadline: 5m
-
-linters:
-  disable-all: true
-  enable:
-    - bodyclose
-    - deadcode
-    - depguard
-    # - dogsled
-    - dupl
-    # - errcheck
-    # - funlen
-    # - gochecknoinits
-    - goconst
-    # - gocritic
-    - gocyclo
-    - gofmt
-    - goimports
-    - golint
-    - gosec
-    - gosimple
-    - govet
-    - ineffassign
-    - interfacer
-    - lll
-    - misspell
-    - nakedret
-    # - scopelint
-    - staticcheck
-    - structcheck
-    # stylecheck demands that acronyms not be treated as words
-    # in camelCase, so JsonOp become JSONOp, etc.  Yuck.
-    # - stylecheck
-    - typecheck
-    - unconvert
-    - unparam
-    - unused
-    - varcheck
-    # - whitespace
-
-linters-settings:
-  dupl:
-    threshold: 400
-  lll:
-    line-length: 170
-  gocyclo:
-    min-complexity: 15
-  golint:
-    min-confidence: 0.85

.golangci.yml

@@ -0,0 +1,91 @@
+# Copyright 2019 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+run:
+  deadline: 5m
+  go: '1.22'
+
+linters:
+  enable-all: true
+  disable:
+    - cyclop
+    - depguard
+    - exhaustivestruct
+    - forbidigo
+    - funlen
+    - gci
+    - gocognit
+    - godot
+    - godox
+    - goerr113
+    - gofumpt
+    - ifshort # too many false positives
+    - ireturn
+    - nilnil
+    - nlreturn
+    - noctx
+    - paralleltest
+    - perfsprint
+    - stylecheck
+    - testifylint
+    - varnamelen
+    - wsl
+    - exhaustruct
+    - deadcode
+    - scopelint
+    - nonamedreturns
+    - golint
+    - maintidx
+    - nosnakecase
+    - testpackage # it's better to keep tests in the same package for now because kustomize does open box testing
+    - structcheck # abandoned by author
+    - varcheck # abandoned by author
+    - maligned # abandoned by author
+    - interfacer # archived by author
+
+linters-settings:
+  dupl:
+    threshold: 400
+  lll:
+    line-length: 170
+  gocyclo:
+    min-complexity: 30
+  revive:
+    rules:
+    - name: var-naming
+      arguments:
+      - [ "ID", "API", "JSON" ] # AllowList
+      - [ ] # DenyList
+  gomnd:
+    ignored-functions:
+    - os.WriteFile
+    - make
+  gomoddirectives:
+    replace-local: true
+  gosec:
+    config:
+      G306: "0644"
+  wrapcheck:
+    ignoreSigs:
+      # defaults
+      - .Errorf(
+      - errors.New(
+      - errors.Unwrap(
+      - .Wrap(
+      - .Wrapf(
+      - .WithMessage(
+      - .WithMessagef(
+      - .WithStack(
+      # from kyaml's errors package
+      - .WrapPrefixf(
+
+issues:
+  new-from-rev: c94b5d8f2 # enables us to enforce a larger set of linters for new code than pass on existing code
+  max-same-issues: 0
+  exclude-rules:
+    - linters:
+        - revive
+      text: "don't use leading"
+    - linters:
+        - staticcheck
+      text: "SA1019: kioutil.Legacy"

ARCHITECTURE.md

@@ -0,0 +1,299 @@
+# Architecture
+
+* _Updated: December 2021_
+
+This document describes the repository organization and the kustomize
+build process. It's meant to lower the barrier to learning and
+contributing to the code base.
+
+If not kept up to date, it will just be a historical snapshot.
+
+
+## Repository layout
+
+[human-edited docs]: https://github.com/kubernetes-sigs/cli-experimental/tree/master/site
+[generated docs]: https://github.com/kubernetes-sigs/cli-experimental/tree/master/docs
+[rendered docs]: https://kubectl.docs.kubernetes.io
+[openapi]: https://kubernetes.io/blog/2016/12/kubernetes-supports-openapi
+
+[`api` module]: https://github.com/kubernetes-sigs/kustomize/blob/master/api/go.mod
+[`api`]: #the-api-module
+[`cmd/config` module]: https://github.com/kubernetes-sigs/kustomize/blob/master/cmd/config/go.mod
+[`cmd/config`]: #the-cmdconfig-module
+[`kustomize` module]: https://github.com/kubernetes-sigs/kustomize/blob/master/kustomize/go.mod
+[`kustomize`]: #the-kustomize-module
+[`kyaml` module]: https://github.com/kubernetes-sigs/kustomize/blob/master/kyaml/go.mod
+[`kyaml`]: #the-kyaml-module
+[`kyaml/kio.Filter`]: https://github.com/Kubernetes-sigs/kustomize/blob/master/kyaml/kio/kio.go
+[`go-yaml`]: https://github.com/go-yaml/yaml/tree/v3
+
+
+[3922]: https://github.com/kubernetes-sigs/kustomize/issues/3922
+
+
+
+ |  directory  | purpose      |
+ | ---------:  | :---------- |
+ |       `api` | The [`api`] module, holding high level kustomize code, suitable for import by other programs.  |
+ |       `cmd` | Various Go programs aiding repo management. See also `hack`. As an outlier, includes the special [`cmd/config`] module. |
+ |      `docs` | Old home of documentation; contains pointers to new homes: [human-edited docs], [generated docs] and [rendered docs]. |
+ |  `examples` | Full kustomization examples that run as pre-merge tests.  |
+ | `functions` | Examples of plugins in KRM function form. TODO([3922]): Move under `plugin`. |
+ |      `hack` | Various shell scripts to help with code management. |
+ | `kustomize` | The [`kustomize`] module holds the `main.go` for kustomize. |
+ |     `kyaml` | The [`kyaml`] module, holding Kubernetes-specific YAML editing packages used by the [`api`] module. Wraps [`go-yaml`] v3.|
+ |    `plugin` | Examples of Kustomize plugins. |
+ | `releasing` | Instructions for releasing the various modules. |
+ |      `site` | Old generated documentation, kept to provide redirection links to the new docs. |
+
+
+## Modules
+
+[semantically versioned]: https://semver.org
+[Go modules]: https://github.com/golang/go/wiki/Modules
+
+The [Go modules] in the kustomize repository are [semantically versioned].
+
+
+### `kustomize`
+
+> _Depends on [`api`], [`cmd/config`], [`kyaml`]_
+
+The [`kustomize` module] contains the `main.go` for `kustomize`, buildable with
+
+```
+(cd kustomize; go install .)
+```
+
+[appears in kubectl]: https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/kubectl/pkg/cmd/kustomize/kustomize.go
+
+Below this are packages containing
+[cobra](http://github.com/spf13/cobra) commands implementing `build`,
+`edit`, `fix`, etc., packages linked together by `main.go`.
+
+These command packages are intentionally public, semantically
+versioned, and can be used in other programs.  Specifically, the
+`kustomize build` command [appears in kubectl] as `kubectl kustomize`.
+
+The code in the `build` package is dominated by flag validation,
+with minimal business logic.  The critical lines are something
+like
+
+```
+# Make a kustomizer.
+k := krusty.MakeKustomizer(
+  HonorKustomizeFlags(krusty.MakeDefaultOptions()),
+)
+
+# Run the kustomizer, sending location of kustomization.yaml
+m := k.Run(fSys, "/path/to/dir")
+
+# Write the result as YAML.
+writer.Write(m.AsYaml())
+```
+
+The `krusty` package is in the [`api`] module.
+
+### `api`
+
+> _Depends on [`kyaml`] and code generated from builtin plugin modules_
+
+The [`api` module] is used by CLI programs like `kustomize` and `kubectl`
+to read and honor `kustomization.yaml` files and all that implies.
+
+The main public packages in the [`api` module] are
+
+ | package   |             |
+ | --------: | :---------- |
+ | `filters` | Implementations of [`kyaml/kio.Filter`] used by kustomize to transform Kubernetes objects. |
+ |  `konfig` | Configuration methods and constants in the kustomize API. |
+ |  `krusty` | Primary API entry point.  Holds the kustomizer and hundreds of tests for it. |
+ |  `loader` | Loads kustomization files and the files they refer to, enforcing security rules. |
+ |  `resmap` | The primary internal data structure over which the kustomizer and filters work. |
+ |   `types` | The `Kustomization` object and ancillary structs. |
+
+### `cmd/config`
+
+> _Depends on [`kyaml`]_
+
+This module contains cobra commands and kyaml-based functionality to
+provide unix-like file manipulation commands to kustomize like `grep`
+and `tree`.  These commands may be included in any program that
+manipulates k8s YAML (e.g. kustomize).
+
+### `kyaml`
+
+> _Has no in-repo dependence_
+
+The [`kyaml` module] is a kubernetes-focussed enhancement of [go-yaml].
+
+The YAML manipulation performed by a kustomize is based on these libraries.
+
+These libraries evolve independently of kustomize, and other programs depend on them.
+
+The key public packages in the [`kyaml` module] include
+
+ | package   |             |
+ | --------: | :---------- |
+ | `errors` | Wrapper for the go-errors/errors lib |
+ | `filesys` | A kustomize-specific file system abstraction, to ease writing tests |
+ | `fn/framework` | An SDK for writing KRM Functions in Go |
+ | `fn/runtime` | Implements the runtime for KRM Function extensions |
+ | `kio` | Libraries for reading and writing collections of Kubernetes resources as RNodes |
+ | `openapi` | Loads and accesses openapi schemas for schema-aware resource manipultaion |
+ | `resid` | Representations to aid in unique identification of Kubernetes resources |
+ | `yaml` | A Kubernetes-focused wrapper of [go-yaml], notably including the RNode object |
+
+
+-------
+
+## How _kustomize build_ works
+
+The command `kustomize build` accepts a single string argument,
+which must resolve to a directory, possibly in a git repository,
+called the _kustomization root_.
+
+This directory must contain a file called `kustomization.yaml`, with
+YAML that marshals into a single instance of a `Kustomization` object.
+
+For the remainder of this document, the word _kustomization_ refers to
+either of these things.
+
+This kustomization is the access point to a directed, acyclic graph of
+Kubernetes objects, including other kustomizations, to include in a
+build.
+
+Execution of `build` starts and ends in the [`api`] module,
+frequently dipping into the [`kyaml`] module for lower level
+YAML manipulation.
+
+### The `build` flow
+
+  - Validate command lines arguments and flags.
+
+  - Make a `Kustomizer` as a function of those arguments.
+
+  - Call `Run` on the kustomizer, passing it the path to the
+    kustomization.
+
+    `Run` returns an instance of `ResMap`, the `api` package's
+    representation of a set of kubernetes `Resource` objects.
+
+    This structure offers resource lookup methods (map behavior),
+    but also retains the resources in the order they were
+    specified in kustomization files (list behavior).
+
+    Post-run, the objects are fully hydrated, per the
+    instructions in the kustomization.
+
+  - Marshal the objects as YAML to a file or `stdout`.
+
+
+### The `Run` function
+
+  - Create various objects
+
+    - A `ResMap` factory.
+
+      Makes  `ResMaps` from byte streams, other `ResMaps`, etc.
+
+    - A file `loader.Loader`.
+
+      It's fed an appropriate set of restrictions, and the path to the kustomization.
+
+    - A plugin loader.
+
+      It finds plugins (transformers, generators or validators)
+      and prepares them for running.
+
+    - A `KustTarget` encapsulating all of the above.
+
+      A KustTarget contains one `Kustomization` and represents
+	  everything that kustomization can reach.  This will include
+	  other `KustTarget` instances, each having a smaller purview than
+	  the one referencing it.
+
+  - Call `KustTarget.Load` to load its kustomization.
+
+    This step deals with deprecations and field changes.
+
+  - Load [openapi] data specified by the kustomization.
+
+    This is needed to recognize k8s kinds and their special
+    properties, e.g. which kinds are cluster-scoped, which kinds
+    refer to others, etc.
+
+  - Call `KustTarget.makeCustomizedResmap` to create the `ResMap` result.
+
+    This visits everything referenced by the kustomization,
+    performing all generation, transformation and validation.
+
+  - Finish the `Run` with
+
+    - Optional reordering of objects in `ResMap`, overriding the
+      FIFO rule.
+
+    - Optional addition of _kustomize build annotations_ to the
+      resources.  E.g. from which repo and file the resource was
+      read, the fact that kustomize touched the resource, etc.
+      These kustomize-specific annotations are intended for
+      server-side data analytics, file structure traceability and
+      reconstruction, etc.
+
+### The `makeCustomizedResmap` function
+
+  This function starts the process of object transformation,
+  as well as accumulation of recursively referenced data.
+
+  - Call `ra := KustTarget.AccumulateTarget`.
+
+    The result, `ra`, is a resource accumulator that contains
+    everything referred to by the current kustomization, now fully
+    hydrated.
+
+  - Uniquify names of generated objects by appending content hashes.
+
+    This cannot be done until the objects are complete.
+
+  - Fix all name references (given that names may have changed).
+
+    E.g. if a ConfigMaps was given a generated name, all objects that
+    refer to that ConfigMap must be given its name.
+
+  - Resolve vars, replacing them with whatever they refer to (a legacy feature).
+
+### The `AccumulateTarget` function
+
+  - Call `AccumulateResources` over the `resources` field (this can recurse).
+  - Call `AccumulateComponents` over the `components` field (this can recurse),
+  - Load legacy (pre-plugin) global kustomize configuration,
+  - Load legacy (pre-openapi) _Custom Resource Definition_ data.
+  - In the context of the data loaded above, run the kustomization's
+    - generators,
+    - transformers,
+    - and validators.
+  - Accumulate `vars` (make note of them for later replacement).
+
+### `AccumulateResources` and component accumulation
+
+  - If the path is a file:
+    - Accumulate the objects in the file (treating them
+      as opaque kubernetes objects).
+
+  - If the path is a directory:
+    - Create a new `KustTarget` referring to that directory's kustomization.
+	- Call `subRa := KustTarget.AccumulateTarget`.
+    - Call `ra.MergeAccumulator(subRa)`
+	This completes a recursion.
+
+  - If the path is a git URL:
+    - Clone the repository to a temporary directory.
+    - Process the path optionally specified in the URL
+      as a path in the clone.
+	- If no path specified, work from the repository root.
+
+
+That's as deep as this discussion will go.
+
+The deeper this document goes into the details, the faster
+it will get out of date.

CONTRIBUTING.md

@@ -1,26 +1,304 @@
+[SIG-CLI]: https://github.com/kubernetes/community/tree/master/sig-cli
+[Slack channel]: https://kubernetes.slack.com/messages/kustomize
+[Mailing list]: https://groups.google.com/forum/#!forum/kubernetes-sig-cli
+
+[OWNERS file spec]: https://github.com/kubernetes/community/blob/master/contributors/guide/owners.md
+[Kustomize OWNERS_ALIASES]: https://github.com/kubernetes-sigs/kustomize/blob/8049f7b1af52e8a7ec26faf6cf714f560d0043c5/OWNERS_ALIASES
+[SIG-CLI Teams]: https://github.com/kubernetes/org/blob/main/config/kubernetes-sigs/sig-cli/teams.yaml
+[Github permissions]: https://docs.github.com/en/organizations/managing-access-to-your-organizations-repositories/repository-permission-levels-for-an-organization#repository-access-for-each-permission-level
+
+[Contributor License Agreement]: https://git.k8s.io/community/CLA.md
+[Kubernetes Contributor Guide]: http://git.k8s.io/community/contributors/guide
+[Contributor Cheat Sheet]: https://git.k8s.io/community/contributors/guide/contributor-cheatsheet/README.md
+[CNCF Code of Conduct]: https://github.com/cncf/foundation/blob/master/code-of-conduct.md
+[Kubernetes Community Membership]: https://github.com/kubernetes/community/blob/master/community-membership.md
+
+[Kustomize Architecture]: ARCHITECTURE.md
+[Contribution Guide]: https://kubectl.docs.kubernetes.io/contributing/kustomize/
+[MacOS Dev Guide]: https://kubectl.docs.kubernetes.io/contributing/kustomize/mac/
+[Windows Dev Guide]: https://kubectl.docs.kubernetes.io/contributing/kustomize/windows/
+
 # Contributing Guidelines
 
-Welcome to Kubernetes. We are excited about the prospect of you joining our [community](https://github.com/kubernetes/community)! The Kubernetes community abides by the CNCF [code of conduct](code-of-conduct.md). Here is an excerpt:
+Welcome to Kubernetes. We are excited about the prospect of you joining our [community](https://github.com/kubernetes/community)! The Kubernetes community abides by the [CNCF Code of Conduct]. Here is an excerpt:
 
 _As contributors and maintainers of this project, and in the interest of fostering an open and welcoming community, we pledge to respect all people who contribute through reporting issues, posting feature requests, updating documentation, submitting pull requests or patches, and other activities._
 
 ## Getting Started
 
-Dev guides:
+### Forking Kustomize and Working Locally
+The Kustomize project uses a "Fork and Pull" workflow that is standard to GitHub. In git terms, your personal fork is referred to as the "origin" and the actual project's git repository is called "upstream". To keep your personal branch (origin) up to date with the project (upstream), it must be configured within your local working copy.
 
-- [Mac](docs/macDevGuide.md)
+### Create a fork in GitHub
+1. Visit https://github.com/kubernetes-sigs/kustomize
+2. Click the `Fork` button on the top right
 
-We have full documentation on how to get started contributing here:
+### Clone the repository
+```bash
+# Clone your repository fork from the previous step
+git clone --recurse-submodules git@github.com:<your github username>/kustomize.git
+cd kustomize
 
-- [Contributor License Agreement](https://git.k8s.io/community/CLA.md) Kubernetes projects require that you sign a Contributor License Agreement (CLA) before we can accept your pull requests
-- [Kubernetes Contributor Guide](http://git.k8s.io/community/contributors/guide) - Main contributor documentation, or you can just jump directly to the [contributing section](http://git.k8s.io/community/contributors/guide#contributing)
-- [Contributor Cheat Sheet](https://git.k8s.io/community/contributors/guide/contributor-cheatsheet/README.md) - Common resources for existing developers
+# Configure upstream
+git remote add upstream https://github.com/kubernetes-sigs/kustomize
+git remote set-url --push upstream no_push
+
+# Review git configuration
+git remote -v
+```
+
+### Create a working branch
+```bash
+# Fetch changes from upstream master
+cd kustomize
+git fetch upstream
+git checkout master
+git rebase upstream/master
+
+# Create your working branch
+git checkout -b myfeature
+```
+
+### Sync your working branch
+You will need to periodically fetch changes from the `upstream` repository to keep your working branch in sync.
+```bash
+cd kustomize
+git fetch upstream
+git checkout myfeature
+git rebase upstream/master
+```
+
+### Push to GitHub
+When your changes are ready for review, push your working branch to your fork on GitHub.
+```bash
+cd kustomize
+git push origin myfeature
+```
+
+### Pull Request Rules
+
+We are using [Conventional Commits v1.0.0](https://www.conventionalcommits.org/en/v1.0.0/) as the main guideline of making PR. This guideline serves to help contributor and maintainer to classify their changes, thus providing better insight on type of release will be covered on each Kustomize release cycle.
+
+1. Please add these keywords on your PR titles accordingly
+
+| Keyword  | Description | Example |
+| ------------- | ------------- | ------------- |
+| fix  | Patching or fixing bugs or improvements introduction from previous release. This type of change will mark a `PATCH` release.  | fix: fix null value when generating yaml |
+| feat  | New features. This change will mark a `MINOR` release. | feat: new transformer and generator for ACME API CRD. |
+| chore  | Minor improvement outside main code base  | chore: add exclusion for transformer test. |
+| ci | CI/CD related changes (e.g. github workflow, scripts, CI steps). | ci: remove blocking tests |
+| docs  | Changes related to documentation. | docs: add rules documentation for PR. |
+
+
+2. Add `BREAKING CHANGE:` on your commit message as footer to signify breaking changes. This will help maintainers identify `MAJOR` releases.
+  
+Example:
+
+```
+feat: change YAML parser from `yaml/v1` to `yaml/v2`
+
+BREAKING CHANGE: parse() function now works with 2 arguments.
+```
+
+### Create a Pull Request
+
+1. Visit your fork at `https://github.com/<user>/kustomize`
+2. Click the **Compare & Pull Request** button next to your `myfeature` branch.
+3. Check out the pull request [process](https://github.com/kubernetes/community/blob/master/contributors/guide/pull-requests.md) for more details and advice.
+
+If you ran `git push` in the previous step, GitHub will return a useful link to create a Pull Request.
+
+### Build Kustomize
+The [Kustomize Architecture] document describes the respository organization and the kustomize build process.
+```bash
+# For go version >= 1.13
+unset GOPATH
+unset GO111MODULES
+
+# Build kustomize binary and install in go bin path
+cd kustomize
+make kustomize
+
+# Run unit tests
+make test-unit-all
+
+# Run linter
+make lint
+
+# Test examples against HEAD
+make test-examples-kustomize-against-HEAD
+
+# Run your development version
+~/go/bin/kustomize version
+```
+
+### General resources for contributors
+
+- [Contributor License Agreement] - Kubernetes projects require that you sign a Contributor License Agreement (CLA) before we can accept your pull requests.
+- [Kubernetes Contributor Guide] - Main contributor documentation.
+- [Contributor Cheat Sheet] - Common resources for existing developers.
+
+Here are some additional ideas to help you get started with Kustomize:
+- Attend a Kustomize Bug Scrub. Check the [SIG-CLI] meetings list to find the next one.
+- Help triage issues by confirming validity and applying the appropriate `kind` label (e.g. comment `/kind bug`).
+- Pick up an issue to fix. Issues with the `help-wanted` label are a good place to start, but you can also look for any issue with the `triage/accepted` label and no assignee. Remember to `/assign` yourself to let others know you're working on it.
+- Help confirm new issues labelled `kind/bug` by reproducing them with the latest release.
+- Support Kustomize users by responding to questions on issues labelled `kind/support` or in the [Slack channel].
 
 ## Mentorship
 
 - [Mentoring Initiatives](https://git.k8s.io/community/mentoring) - We have a diverse set of mentorship programs available that are always looking for volunteers!
 
+## Contributor Ladder
+
+Kustomize follows the [Kubernetes Community Membership] contributor ladder. Roles are as follows:
+
+1. Contributor: Anyone who actively contributes code, issues or reviews to the project. All contributors must sign the [Contributor License Agreement].
+1. Reviewer: Contributors with a history of review and authorship on Kustomize. Has LGTM rights on the Kustomize repo (as do all kubernetes-sigs org members). Active contributors are encouraged to join the reviewers list to be automatically pinged on PRs.
+1. Approver: Highly experienced active reviewer and contributor to Kustomize. Has both LTGM and approval rights on the Kustomize repo, as well as "maintain" [Github permissions].
+1. Owner: Approver who sets technical direction and makes or approves design decisions for the project. Has LGTM and approval rights on the Kustomize repo as well as "admin" [Github permissions].
+
+The kyaml module within the Kustomize repo has additional owners following the same ladder.
+
+For the kustomize project, we have defined some specific guidelines on each step of the ladder:
+
+To reach reviewer status, you must:
+- Have been actively involved in kustomize for 3+ months
+- Review at least 8 PRs that have been driven through to completion (see the reviewer guide below)
+- Author at least 5 PRs that have been approved and merged
+- Be a member of the kubernetes-sigs org. This should not be a blocker though, as once you meet the requirements for reviewer here,
+the existing kustomize maintainers will be happy to sponsor your request to join the kubernetes-sigs org.
+- Once you have met the above requirements, you may submit a PR adding yourself to the kustomize reviewers list, with links to your
+contributions in the description.
+
+To reach approver status, you must:
+- Meet all the requirements of a reviewer
+- Have been actively involved in kustomize for 6+ months
+- Review at least 15 PRs that have been driven through to completion (see the reviewer guide below)
+- Authored PRs meeting *either* of the following requirements:
+  - 15 PRs that have been approved and merged
+  - *OR* 10 PRs that have been approved and merged where some were more difficult, required greater thought/design,
+or built up to larger features/long-term goals.
+- File 3 issues. This can be any number of things, including but not limited to:
+  - Bugs with kustomize usage that you've found
+  - CI or release improvements
+  - Creating subtasks of a larger feature or project that you are in charge of.
+  - Long term improvements for the health of the project
+- Triage at least 10 untriaged issues, including at least 1 feature request. The kustomize bug scrub is a great place to get practice with doing this, but you can
+also follow the triage guide below to get started on your own.
+- Demonstrate deeper understanding of kustomize goals. This can take many forms and is a bit subjective, but here are a few examples:
+  - saying no to an eschewed feature, instead recommending an alternative solution that is more aligned with the declarative configuration model
+  - active participation in discussion on a feature request issue
+  - filing an issue describing a long term problem and solution aligned with kustomize goals, for example: https://github.com/kubernetes-sigs/kustomize/issues/5140
+  - writing up KEPs for features that will improve the kustomize workflow while being aligned with kustomize goals, for example: https://github.com/kubernetes-sigs/kustomize/pull/4558
+- Regularly interact with the existing kustomize maintainers, with clear communication about what you are working on or planning to work on. The kustomize
+maintainers should know who you are and be familiar with your contributions.
+- If you meet *most* of the above requirements while going above and beyond in a few areas, we will still consider your request to become an approver even
+if you are missing one or two of the requirements. Please contact the maintainers directly to ask about getting approver status if you fall into this category.
+- Otherwise, once you meet all the above requirements, you may:
+  - request to be added to the kustomize maintainer meeting that occurs each week with the kustomize PMs.
+  - submit a PR adding yourself to the kustomize approvers list, with links to your contributions in the description.
+
+To reach owner status, you must:
+- Meet all the requirements of an approver
+- Have been actively involved with kustomize for 1+ year
+- Assisted the current owner in driving the roadmap. This can be explicit or implicit help, such as:
+  - Editing the roadmap directly
+  - Reviewing the roadmap
+  - Providing suggestions for issues or prioritization in meetings that indirectly influence the roadmap
+- Regularly triage issues and attend the kustomize bug scrub
+- Regularly review PRs (1-2 a week)
+- Periodically lead the kustomize bug scrub
+- Periodically release kustomize (ensuring that there are no release blockers and that release notes are clean)
+- Be the primary owner or point of contact for a particular project or area of code
+- Ideally, there should be 2-3 owners at a time. Reach out to the current owners if you are interested in ownership. These
+requirements are not strict and evaluation is somewhat subjective.
+
+## Reviewer guide
+Please watch this talk on how to review code from Tim Hockin: https://www.youtube.com/watch?v=OZVv7-o8i40
+
+For reviewing PRs in kustomize, we have some specific guidelines:
+- If the PR is introducing a new feature:
+  - *It must be implementing an issue that has already been triage/accepted or
+a KEP that has been approved.* If it is not, then request the PR author to first file an issue.
+  - The PR must include thorough tests for the new feature, including unit and integration tests
+  - The code must be clean and readable, with thought given to how we will maintain the code in the future
+  - If the feature requires being broken up into multiple PRs to ease review, the feature should not be exposed to users
+    until the feature is completed in the last PR. For example, while we were building `kustomize localize`, we
+    built the feature almost entirely under the `api` module as a library with all the needed tests. There was no way
+    for users to invoke the localize code until the last PR that actually exposed the `kustomize localize` command in the
+    kustomize binary. This allowed us to continue development of `kustomize localize` without blocking kustomize releases.
+    If this type of development is not possible, then new features requiring multiple PRs should be
+    developed in their own feature branch.
+- If the PR is introducing a bug fix:
+  - If the PR is not fixing an issue that has already been triage/accepted, follow the triage guide below on bug
+    fixes to decide if this is a PR we want to accept.
+  - The PR should have two distinct commits:
+    - The first commit should add a test demonstrating incorrect behavior
+    - The second commit should include the bug fix
+    - Some sample PRs:
+      - https://github.com/kubernetes-sigs/kustomize/pull/5263/commits
+      - https://github.com/kubernetes-sigs/kustomize/pull/3931/commits
+    - The regression test is absolutely required, and we cannot accept bug fixes without tests.
+- If the PR is introducing a performance improvement:
+  - The PR description should give an indication of how much the performance is being improved and how we
+    can measure it - benchmark tests are fantastic.
+- Other PRs (documentation, CI improvements, etc.) should be reviewed based on your best judgment.
+
+## Triage guide
+The possible triage labels are listed here: https://github.com/kubernetes-sigs/kustomize/labels?q=triage.
+
+Triaging a feature request means:
+- Understand what the user is asking for, and their use case.
+- Verify that it is not an [eschewed feature](https://kubectl.docs.kubernetes.io/faq/kustomize/eschewedfeatures/#build-time-side-effects-from-cli-args-or-env-variables)
+- Verify that it is not a duplicate issue.
+- Look into workarounds. Is there another way that the user can achieve their use case with existing features?
+- If you are new to this role, prior to leaving a comment on the issue, please bring it to weekly standup
+for group discussion to make sure that we are all on the same page.
+- Once you feel ready, you can label it with a triage label. Here's an [example](https://github.com/kubernetes-sigs/kustomize/issues/5049). You can also
+look at other feature request issues to see how they were triaged and resolved. There are a few different triage labels that you can use, you can see the
+full list [here](https://github.com/kubernetes-sigs/kustomize/labels?q=triage).
+
+Triaging a bug means:
+- First, verify that you can reproduce the issue. If you cannot reproduce the issue or need more information to give
+it a go, triage it accordingly.
+- Try to understand if this is really a bug or if this is intended behavior from kustomize. If it seems like intended
+behavior, do your best to explain to the user why this is the case.
+- If it seems to be a genuine bug, you can /triage accept the issue. In addition, investigate if there are workarounds or
+alternative solutions for the user that they can try until the issue gets resolved.
+
+The triage party for kustomize is here https://cli.triage.k8s.io/s/kustomize and can be a easy way to
+find issues that have not been triaged yet.
+
+## Project/Product Managers
+
+Kustomize will have opportunities to join in a project/product manager role. You can reach out to
+the existing kustomize maintainers if you are interested in this type of role. Project management work
+can greatly help supplement your contributions as you climb from reviewer to approver
+to owner.
+
+Expectations for this role are:
+
+- Triage 1 feature request each week, and bring it to weekly stand-up for discussion. Feature
+requests are issues labeled kind/feature, and you can find them [here](https://github.com/kubernetes-sigs/kustomize/issues?q=is%3Aissue+is%3Aopen+kind+feature+label%3Akind%2Ffeature).
+Please view the above triage guide for details on how to approach feature request triage.
+- Monitor the kustomize Slack channel and try to help users if you can. It is a pretty
+active channel, so responding to 4-5 users per week is sufficient even if some
+questions go unanswered. If there is an interesting topic or a recurring problem that many
+users are having, please bring it up in weekly stand-up.
+- Keeping track of a queue of backlog issues or PRs that are not being actively looked at in any existing project board.
+- Organizing or reorganizing project tracking boards when it makes sense.
+
+You will also be asked to help with roadmap planning, deprecation communication, prioritization,
+and doing research on kustomize usage when appropriate, though these responsibilities will occur less
+frequently.
+
+## Administrative notes:
+
+- The [OWNERS file spec] is a useful resources in making changes.
+- Maintainers and admins must be added to the appropriate lists in both [Kustomize OWNERS_ALIASES] and [SIG-CLI Teams]. If this isn't done, the individual in question will lack either PR approval rights (Kustomize list) or the appropriate Github repository permissions (community list).
+
 ## Contact Information
 
-- [Slack channel](https://kubernetes.slack.com/messages/sig-cli)
-- [Mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-cli)
+- [Slack channel]
+- [Mailing list]

Makefile

@@ -3,223 +3,165 @@
 #
 # Makefile for kustomize CLI and API.
 
-MYGOBIN := $(shell go env GOPATH)/bin
-SHELL := /bin/bash
+LATEST_RELEASE=v5.6.0
+
+SHELL := /usr/bin/env bash
+GOOS = $(shell go env GOOS)
+GOARCH = $(shell go env GOARCH)
+MYGOBIN = $(shell go env GOBIN)
+ifeq ($(MYGOBIN),)
+MYGOBIN = $(shell go env GOPATH)/bin
+endif
 export PATH := $(MYGOBIN):$(PATH)
 
-.PHONY: all
-all: verify-kustomize
+# Provide defaults for REPO_OWNER and REPO_NAME if not present.
+# Typically these values would be provided by Prow.
+ifndef REPO_OWNER
+REPO_OWNER := "kubernetes-sigs"
+endif
 
-.PHONY: verify-kustomize
-verify-kustomize: \
-	lint-kustomize \
-	test-unit-kustomize-all \
+ifndef REPO_NAME
+REPO_NAME := "kustomize"
+endif
+
+
+# --- Plugins ---
+include Makefile-plugins.mk
+
+
+# --- Tool management ---
+include Makefile-tools.mk
+
+.PHONY: install-tools
+install-tools: \
+	install-local-tools \
+	install-out-of-tree-tools
+
+.PHONY: uninstall-tools
+uninstall-tools: \
+	uninstall-local-tools \
+	uninstall-out-of-tree-tools
+
+.PHONY: install-local-tools
+install-local-tools: \
+	$(MYGOBIN)/gorepomod \
+	$(MYGOBIN)/k8scopy \
+	$(MYGOBIN)/pluginator
+
+.PHONY: uninstall-local-tools
+uninstall-local-tools:
+	rm -f $(MYGOBIN)/gorepomod
+	rm -f $(MYGOBIN)/k8scopy
+	rm -f $(MYGOBIN)/pluginator
+
+# Build from local source.
+$(MYGOBIN)/gorepomod:
+	cd cmd/gorepomod && go install .
+
+# Build from local source.
+$(MYGOBIN)/k8scopy:
+	cd cmd/k8scopy && go install .
+
+# Build from local source.
+$(MYGOBIN)/pluginator:
+	cd cmd/pluginator && go install .
+
+
+# --- Build targets ---
+
+# Build from local source.
+$(MYGOBIN)/kustomize: build-kustomize-api
+	cd kustomize && go install -ldflags \
+	"-X sigs.k8s.io/kustomize/api/provenance.buildDate=$(shell date -u +'%Y-%m-%dT%H:%M:%SZ') \
+	 -X sigs.k8s.io/kustomize/api/provenance.version=$(shell git describe --tags --always --dirty)" \
+	.
+
+kustomize: $(MYGOBIN)/kustomize
+
+# Used to add non-default compilation flags when experimenting with
+# plugin-to-api compatibility checks.
+.PHONY: build-kustomize-api
+build-kustomize-api: $(MYGOBIN)/goimports $(builtinplugins)
+	cd api && $(MAKE) build
+
+.PHONY: generate-kustomize-api
+generate-kustomize-api:
+	cd api && $(MAKE) generate
+
+
+# --- Verification targets ---
+.PHONY: verify-kustomize-repo
+verify-kustomize-repo: \
+	install-tools \
+	lint \
+	check-license \
+	test-unit-all \
+	build-non-plugin-all \
+	test-go-mod \
 	test-examples-kustomize-against-HEAD \
-	test-examples-kustomize-against-latest
+	test-examples-kustomize-against-latest-release
 
 # The following target referenced by a file in
 # https://github.com/kubernetes/test-infra/tree/master/config/jobs/kubernetes-sigs/kustomize
 .PHONY: prow-presubmit-check
 prow-presubmit-check: \
-	lint-kustomize \
-	test-unit-kustomize-all \
-	test-unit-cmd-all \
-	test-go-mod
+	install-tools \
+	workspace-sync \
+	generate-kustomize-builtin-plugins \
+	builtin-plugins-diff \
+	test-unit-kustomize-plugins \
+	test-go-mod \
+	build-non-plugin-all \
+	test-examples-kustomize-against-HEAD \
+	test-examples-kustomize-against-latest-release
 
-.PHONY: verify-kustomize-e2e
-verify-kustomize-e2e: test-examples-e2e-kustomize
+.PHONY: license
+license: $(MYGOBIN)/addlicense
+	./hack/add-license.sh run
 
-# Other builds in this repo might want a different linter version.
-# Without one Makefile to rule them all, the different makes
-# cannot assume that golanci-lint is at the version they want
-# since everything uses the same implicit GOPATH.
-# This installs in a temp dir to avoid overwriting someone else's
-# linter, then installs in MYGOBIN with a new name.
-# Version pinned by hack/go.mod
-$(MYGOBIN)/golangci-lint-kustomize:
-	( \
-		set -e; \
-		export GOBIN=$$(mktemp -d); \
-		cd hack; \
-		GO111MODULE=on go install github.com/golangci/golangci-lint/cmd/golangci-lint; \
-		mv $$GOBIN/golangci-lint $(MYGOBIN)/golangci-lint-kustomize \
-	)
+.PHONY: check-license
+check-license: $(MYGOBIN)/addlicense
+	./hack/add-license.sh check
 
-# Version pinned by api/go.mod
-$(MYGOBIN)/mdrip:
-	cd api; \
-	go install github.com/monopole/mdrip
+.PHONY: lint
+lint: $(MYGOBIN)/golangci-lint $(MYGOBIN)/goimports $(builtinplugins)
+	./hack/for-each-module.sh "make lint"
 
-# Version pinned by api/go.mod
-$(MYGOBIN)/stringer:
-	cd api; \
-	go install golang.org/x/tools/cmd/stringer
+.PHONY: apidiff
+apidiff: $(MYGOBIN)/go-apidiff ## Run the go-apidiff to verify any API differences compared with origin/master
+	go-apidiff master --compare-imports --print-compatible --repo-path=.
 
-# Version pinned by api/go.mod
-$(MYGOBIN)/goimports:
-	cd api; \
-	go install golang.org/x/tools/cmd/goimports
-
-# Install resource from whatever is checked out.
-$(MYGOBIN)/resource:
-	cd cmd/resource; \
-	go install .
-
-# To pin pluginator, use this recipe instead:
-#   cd api;
-#   go install sigs.k8s.io/kustomize/pluginator/v2
-$(MYGOBIN)/pluginator:
-	cd pluginator; \
-	go install .
-
-# Install kustomize from whatever is checked out.
-$(MYGOBIN)/kustomize:
-	cd kustomize; \
-	go install .
-
-.PHONY: install-tools
-install-tools: \
-	$(MYGOBIN)/goimports \
-	$(MYGOBIN)/golangci-lint-kustomize \
-	$(MYGOBIN)/mdrip \
-	$(MYGOBIN)/pluginator \
-	$(MYGOBIN)/stringer
-
-### Begin kustomize plugin rules.
-#
-# The rules to deal with builtin plugins are a bit
-# complicated because
-#
-# - Every builtin plugin is a Go plugin -
-#   meaning it gets its own module directory
-#   (outside of the api module) with Go
-#   code in a 'main' package per Go plugin rules.
-# - kustomize locates plugins using the
-#   'apiVersion' and 'kind' fields from the
-#   plugin config file.
-# - k8s wants CamelCase in 'kind' fields.
-# - The module name (the last name in the path)
-#   must be the lowercased 'kind' of the
-#   plugin because Go and related tools
-#   demand lowercase in import paths, but
-#   allow CamelCase in file names.
-# - the generated code must live in the api
-#   module (it's linked into the api).
-
-# Where all generated builtin plugin code should go.
-pGen=api/builtins
-# Where the builtin Go plugin modules live.
-pSrc=plugin/builtin
-
-_builtinplugins = \
-	AnnotationsTransformer.go \
-	ConfigMapGenerator.go \
-	HashTransformer.go \
-	ImageTagTransformer.go \
-	LabelTransformer.go \
-	LegacyOrderTransformer.go \
-	NamespaceTransformer.go \
-	PatchJson6902Transformer.go \
-	PatchStrategicMergeTransformer.go \
-	PatchTransformer.go \
-	PrefixSuffixTransformer.go \
-	ReplicaCountTransformer.go \
-	SecretGenerator.go \
-	ValueAddTransformer.go
-
-# Maintaining this explicit list of generated files, and
-# adding it as a dependency to a few targets, to assure
-# they get recreated if deleted.  The rules below on how
-# to make them don't, by themselves, assure they will be
-# recreated if deleted.
-builtinplugins = $(patsubst %,$(pGen)/%,$(_builtinplugins))
-
-# These rules are verbose, but assure that if a source file
-# is modified, the corresponding generated file, and only
-# that file, will be recreated.
-$(pGen)/AnnotationsTransformer.go: $(pSrc)/annotationstransformer/AnnotationsTransformer.go
-$(pGen)/ConfigMapGenerator.go: $(pSrc)/configmapgenerator/ConfigMapGenerator.go
-$(pGen)/HashTransformer.go: $(pSrc)/hashtransformer/HashTransformer.go
-$(pGen)/ImageTagTransformer.go: $(pSrc)/imagetagtransformer/ImageTagTransformer.go
-$(pGen)/LabelTransformer.go: $(pSrc)/labeltransformer/LabelTransformer.go
-$(pGen)/LegacyOrderTransformer.go: $(pSrc)/legacyordertransformer/LegacyOrderTransformer.go
-$(pGen)/NamespaceTransformer.go: $(pSrc)/namespacetransformer/NamespaceTransformer.go
-$(pGen)/PatchJson6902Transformer.go: $(pSrc)/patchjson6902transformer/PatchJson6902Transformer.go
-$(pGen)/PatchStrategicMergeTransformer.go: $(pSrc)/patchstrategicmergetransformer/PatchStrategicMergeTransformer.go
-$(pGen)/PatchTransformer.go: $(pSrc)/patchtransformer/PatchTransformer.go
-$(pGen)/PrefixSuffixTransformer.go: $(pSrc)/prefixsuffixtransformer/PrefixSuffixTransformer.go
-$(pGen)/ReplicaCountTransformer.go: $(pSrc)/replicacounttransformer/ReplicaCountTransformer.go
-$(pGen)/SecretGenerator.go: $(pSrc)/secretgenerator/SecretGenerator.go
-$(pGen)/ValueAddTransformer.go: $(pSrc)/valueaddtransformer/ValueAddTransformer.go
-
-# The (verbose but portable) Makefile way to convert to lowercase.
-toLowerCase = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,$(subst X,x,$(subst Y,y,$(subst Z,z,$1))))))))))))))))))))))))))
-
-$(pGen)/%.go: $(MYGOBIN)/pluginator
-	@echo "generating $*"
-	( \
-		set -e; \
-		cd $(pSrc)/$(call toLowerCase,$*); \
-		go generate .; \
-		cd ../../../$(pGen); \
-		$(MYGOBIN)/goimports -w $*.go \
-	)
-
-# Target is for debugging.
-.PHONY: generate-kustomize-builtin-plugins
-generate-kustomize-builtin-plugins: $(builtinplugins)
-
-.PHONY: kustomize-external-go-plugin-build
-kustomize-external-go-plugin-build:
-	./hack/buildExternalGoPlugins.sh ./plugin
-
-.PHONY: kustomize-external-go-plugin-clean
-kustomize-external-go-plugin-clean:
-	./hack/buildExternalGoPlugins.sh ./plugin clean
-
-### End kustomize plugin rules.
-
-.PHONY: lint-kustomize
-lint-kustomize: install-tools $(builtinplugins)
-	cd api; \
-	$(MYGOBIN)/golangci-lint-kustomize -c ../.golangci-kustomize.yml run ./...
-	cd kustomize; \
-	$(MYGOBIN)/golangci-lint-kustomize -c ../.golangci-kustomize.yml run ./...
-	cd pluginator; \
-	$(MYGOBIN)/golangci-lint-kustomize -c ../.golangci-kustomize.yml run ./...
-
-# Used to add non-default compilation flags when experimenting with
-# plugin-to-api compatibility checks.
-.PHONY: build-kustomize-api
-build-kustomize-api: $(builtinplugins)
-	cd api; go build ./...
-
-.PHONY: test-unit-kustomize-api
-test-unit-kustomize-api: build-kustomize-api
-	cd api; go test ./...
-
-.PHONY: test-unit-kustomize-plugins
-test-unit-kustomize-plugins:
-	./hack/testUnitKustomizePlugins.sh
-
-.PHONY: test-unit-kustomize-cli
-test-unit-kustomize-cli:
-	cd kustomize; go test ./...
-
-.PHONY: test-unit-kustomize-all
-test-unit-kustomize-all: \
-	test-unit-kustomize-api \
-	test-unit-kustomize-cli \
+.PHONY: test-unit-all
+test-unit-all: \
+	test-unit-non-plugin \
 	test-unit-kustomize-plugins
 
-test-unit-cmd-all:
-	./travis/kyaml-pre-commit.sh
+# This target is used by our Github Actions CI to run unit tests for all non-plugin modules in multiple GOOS environments.
+.PHONY: test-unit-non-plugin
+test-unit-non-plugin:
+	./hack/for-each-module.sh "make test" "./plugin/*" 20
+
+.PHONY: build-non-plugin-all
+build-non-plugin-all:
+	./hack/for-each-module.sh "make build" "./plugin/*" 20
+
+.PHONY: test-unit-kustomize-plugins
+test-unit-kustomize-plugins: build-kustomize-external-go-plugin
+	./hack/testUnitKustomizePlugins.sh
+
+.PHONY: functions-examples-all
+functions-examples-all:
+	for dir in $(abspath $(wildcard functions/examples/*/.)); do \
+		echo -e "\n---Running make tasks for function $$dir---"; \
+		set -e; \
+		cd $$dir; $(MAKE) all; \
+	done
 
 test-go-mod:
-	./travis/check-go-mod.sh
+	./hack/for-each-module.sh "go mod tidy -v"
 
 .PHONY:
-test-examples-e2e-kustomize: $(MYGOBIN)/mdrip $(MYGOBIN)/kind
+verify-kustomize-e2e: $(MYGOBIN)/mdrip $(MYGOBIN)/kind
 	( \
 		set -e; \
 		/bin/rm -f $(MYGOBIN)/kustomize; \
@@ -233,83 +175,21 @@ test-examples-kustomize-against-HEAD: $(MYGOBIN)/kustomize $(MYGOBIN)/mdrip
 	./hack/testExamplesAgainstKustomize.sh HEAD
 
 .PHONY:
-test-examples-kustomize-against-latest: $(MYGOBIN)/mdrip
-	( \
-		set -e; \
-		/bin/rm -f $(MYGOBIN)/kustomize; \
-		echo "Installing kustomize from latest."; \
-		GO111MODULE=on go get sigs.k8s.io/kustomize/kustomize/v3@v3.5.4; \
-		./hack/testExamplesAgainstKustomize.sh latest; \
-		echo "Reinstalling kustomize from HEAD."; \
-		cd kustomize; go install .; \
-	)
-
-# linux only.
-# This is for testing an example plugin that
-# uses kubeval for validation.
-# Don't want to add a hard dependence in go.mod file
-# to github.com/instrumenta/kubeval.
-# Instead, download the binary.
-$(MYGOBIN)/kubeval:
-	( \
-		set -e; \
-		d=$(shell mktemp -d); cd $$d; \
-		wget https://github.com/instrumenta/kubeval/releases/latest/download/kubeval-linux-amd64.tar.gz; \
-		tar xf kubeval-linux-amd64.tar.gz; \
-		mv kubeval $(MYGOBIN); \
-		rm -rf $$d; \
-	)
-
-# linux only.
-# This is for testing an example plugin that uses helm to inflate a chart
-# for subsequent kustomization.
-# Don't want to add a hard dependence in go.mod file to helm.
-# Instead, download the binaries.
-$(MYGOBIN)/helmV2:
-	( \
-		set -e; \
-		d=$(shell mktemp -d); cd $$d; \
-		tgzFile=helm-v2.13.1-linux-amd64.tar.gz; \
-		wget https://storage.googleapis.com/kubernetes-helm/$$tgzFile; \
-		tar -xvzf $$tgzFile; \
-		mv linux-amd64/helm $(MYGOBIN)/helmV2; \
-		rm -rf $$d \
-	)
-
-# Helm V3 differs from helm V2; downloading it to provide coverage for the
-# chart inflator plugin under helm v3.
-$(MYGOBIN)/helmV3:
-	( \
-		set -e; \
-		d=$(shell mktemp -d); cd $$d; \
-		tgzFile=helm-v3.2.0-rc.1-linux-amd64.tar.gz; \
-		wget https://get.helm.sh/$$tgzFile; \
-		tar -xvzf $$tgzFile; \
-		mv linux-amd64/helm $(MYGOBIN)/helmV3; \
-		rm -rf $$d \
-	)
-
-# Default version of helm is v2 for the time being.
-$(MYGOBIN)/helm: $(MYGOBIN)/helmV2
-	ln -s $(MYGOBIN)/helmV2 $(MYGOBIN)/helm
-
-$(MYGOBIN)/kind:
-	( \
-        set -e; \
-        d=$(shell mktemp -d); cd $$d; \
-        wget -O ./kind https://github.com/kubernetes-sigs/kind/releases/download/v0.7.0/kind-$(shell uname)-amd64; \
-        chmod +x ./kind; \
-        mv ./kind $(MYGOBIN); \
-        rm -rf $$d; \
-	)
+test-examples-kustomize-against-latest-release: $(MYGOBIN)/mdrip
+	./hack/testExamplesAgainstKustomize.sh v5@$(LATEST_RELEASE)
 
+# Pushes dependencies in the go.work file back to go.mod files of each workspace module.
+.PHONY: workspace-sync
+workspace-sync:
+	go work sync
+	./hack/doGoMod.sh tidy
+	
+# --- Cleanup targets ---
 .PHONY: clean
-clean: kustomize-external-go-plugin-clean
+clean: clean-kustomize-external-go-plugin uninstall-tools
 	go clean --cache
 	rm -f $(builtinplugins)
-	rm -f $(MYGOBIN)/pluginator
 	rm -f $(MYGOBIN)/kustomize
-	rm -f $(MYGOBIN)/golangci-lint-kustomize
 
 # Nuke the site from orbit.  It's the only way to be sure.
 .PHONY: nuke

Makefile-modules.mk

@@ -0,0 +1,39 @@
+# Copyright 2022 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+MYGOBIN = $(shell go env GOBIN)
+ifeq ($(MYGOBIN),)
+MYGOBIN = $(shell go env GOPATH)/bin
+endif
+export PATH := $(MYGOBIN):$(PATH)
+
+# only set this if not already set, so importing makefiles can override it
+export KUSTOMIZE_ROOT ?= $(shell pwd | sed -E 's|(.*\/kustomize)/(.*)|\1|')
+include $(KUSTOMIZE_ROOT)/Makefile-tools.mk
+
+.PHONY: lint test fix fmt tidy vet build
+
+lint: $(MYGOBIN)/golangci-lint
+	$(MYGOBIN)/golangci-lint cache clean # Workaround for https://github.com/golangci/golangci-lint/issues/3228
+	$(MYGOBIN)/golangci-lint \
+	  -c $$KUSTOMIZE_ROOT/.golangci.yml \
+	  --path-prefix $(shell pwd | sed -E 's|(.*\/kustomize)/(.*)|\2|') \
+	  run ./...
+
+test:
+	go test -v -timeout 45m -cover ./...
+
+fix:
+	go fix ./...
+
+fmt:
+	go fmt ./...
+
+tidy:
+	go mod tidy
+
+vet:
+	go vet ./...
+
+build:
+	go build -v -o $(MYGOBIN) ./...

Makefile-plugins.mk

@@ -0,0 +1,120 @@
+# Copyright 2022 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+### Kustomize plugin rules.
+#
+# The rules to deal with builtin plugins are a bit
+# complicated because
+#
+# - Every builtin plugin is a Go plugin -
+#   meaning it gets its own module directory
+#   (outside of the api module) with Go
+#   code in a 'main' package per Go plugin rules.
+# - kustomize locates plugins using the
+#   'apiVersion' and 'kind' fields from the
+#   plugin config file.
+# - k8s wants CamelCase in 'kind' fields.
+# - The module name (the last name in the path)
+#   must be the lowercased 'kind' of the
+#   plugin because Go and related tools
+#   demand lowercase in import paths, but
+#   allow CamelCase in file names.
+# - the generated code must live in the api
+#   module (it's linked into the api).
+
+# Where all generated builtin plugin code should go.
+pGen=api/internal/builtins
+# Where the builtin Go plugin modules live.
+pSrc=plugin/builtin
+
+_builtinplugins = \
+	AnnotationsTransformer.go \
+	ConfigMapGenerator.go \
+	IAMPolicyGenerator.go \
+	HashTransformer.go \
+	ImageTagTransformer.go \
+	LabelTransformer.go \
+	SortOrderTransformer.go \
+	NamespaceTransformer.go \
+	PatchJson6902Transformer.go \
+	PatchStrategicMergeTransformer.go \
+	PatchTransformer.go \
+	PrefixTransformer.go \
+	SuffixTransformer.go \
+	ReplacementTransformer.go \
+	ReplicaCountTransformer.go \
+	SecretGenerator.go \
+	ValueAddTransformer.go \
+	HelmChartInflationGenerator.go
+
+# Maintaining this explicit list of generated files, and
+# adding it as a dependency to a few targets, to assure
+# they get recreated if deleted.  The rules below on how
+# to make them don't, by themselves, assure they will be
+# recreated if deleted.
+builtinplugins = $(patsubst %,$(pGen)/%,$(_builtinplugins))
+
+# These rules are verbose, but assure that if a source file
+# is modified, the corresponding generated file, and only
+# that file, will be recreated.
+$(pGen)/AnnotationsTransformer.go: $(pSrc)/annotationstransformer/AnnotationsTransformer.go
+$(pGen)/ConfigMapGenerator.go: $(pSrc)/configmapgenerator/ConfigMapGenerator.go
+$(pGen)/GkeSaGenerator.go: $(pSrc)/gkesagenerator/GkeSaGenerator.go
+$(pGen)/HashTransformer.go: $(pSrc)/hashtransformer/HashTransformer.go
+$(pGen)/ImageTagTransformer.go: $(pSrc)/imagetagtransformer/ImageTagTransformer.go
+$(pGen)/LabelTransformer.go: $(pSrc)/labeltransformer/LabelTransformer.go
+$(pGen)/SortOrderTransformer.go: $(pSrc)/sortordertransformer/SortOrderTransformer.go
+$(pGen)/NamespaceTransformer.go: $(pSrc)/namespacetransformer/NamespaceTransformer.go
+$(pGen)/PatchJson6902Transformer.go: $(pSrc)/patchjson6902transformer/PatchJson6902Transformer.go
+$(pGen)/PatchStrategicMergeTransformer.go: $(pSrc)/patchstrategicmergetransformer/PatchStrategicMergeTransformer.go
+$(pGen)/PatchTransformer.go: $(pSrc)/patchtransformer/PatchTransformer.go
+$(pGen)/PrefixTransformer.go: $(pSrc)/prefixtransformer/PrefixTransformer.go
+$(pGen)/SuffixTransformer.go: $(pSrc)/suffixtransformer/SuffixTransformer.go
+$(pGen)/ReplacementTransformer.go: $(pSrc)/replacementtransformer/ReplacementTransformer.go
+$(pGen)/ReplicaCountTransformer.go: $(pSrc)/replicacounttransformer/ReplicaCountTransformer.go
+$(pGen)/SecretGenerator.go: $(pSrc)/secretgenerator/SecretGenerator.go
+$(pGen)/ValueAddTransformer.go: $(pSrc)/valueaddtransformer/ValueAddTransformer.go
+$(pGen)/HelmChartInflationGenerator.go: $(pSrc)/helmchartinflationgenerator/HelmChartInflationGenerator.go
+
+# The (verbose but portable) Makefile way to convert to lowercase.
+toLowerCase = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,$(subst X,x,$(subst Y,y,$(subst Z,z,$1))))))))))))))))))))))))))
+
+$(pGen)/%.go: $(MYGOBIN)/pluginator $(MYGOBIN)/goimports
+	@echo "generating $*"
+	( \
+		set -e; \
+		cd $(pSrc)/$(call toLowerCase,$*); \
+		go generate .; \
+		cd ../../../$(pGen); \
+		$(MYGOBIN)/goimports -w $*.go \
+	)
+
+# Generate builtin plugins
+.PHONY: generate-kustomize-builtin-plugins
+generate-kustomize-builtin-plugins: $(builtplugins)
+	for plugin in $(abspath $(wildcard $(pSrc)/*)); do \
+		echo "generating $${plugin} ..."; \
+		set -e; \
+		cd $${plugin}; \
+		go generate .; \
+	done
+
+# Check for diff by comparing current revision of generated plugins on HEAD and newly generated plugins on local branch, 
+# If diff is found, throw error code 1
+.PHONY: builtin-plugins-diff
+builtin-plugins-diff: $(builtplugins)
+	for file in $(abspath $(builtinplugins)); do \
+		echo "Checking for diff... $${file}" ; \
+		set -e ; \
+		if [ "`git diff $${file} | wc -c`" -gt 0 ]; then\
+			echo "Error(1): diff found on $${file}"; exit 1; \
+		fi \
+	done
+
+.PHONY: build-kustomize-external-go-plugin
+build-kustomize-external-go-plugin:
+	./hack/buildExternalGoPlugins.sh ./plugin
+
+.PHONY: clean-kustomize-external-go-plugin
+clean-kustomize-external-go-plugin:
+	./hack/buildExternalGoPlugins.sh ./plugin clean

Makefile-tools.mk

@@ -0,0 +1,97 @@
+# Copyright 2022 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+GOOS = $(shell go env GOOS)
+GOARCH = $(shell go env GOARCH)
+MYGOBIN = $(shell go env GOBIN)
+ifeq ($(MYGOBIN),)
+MYGOBIN = $(shell go env GOPATH)/bin
+endif
+export PATH := $(MYGOBIN):$(PATH)
+
+REPO_ROOT=$(shell git rev-parse --show-toplevel)
+
+# determines whether to run tests that only behave locally; can be overridden by override variable
+export IS_LOCAL = false
+
+.PHONY: install-out-of-tree-tools
+install-out-of-tree-tools: \
+	$(MYGOBIN)/goimports \
+	$(MYGOBIN)/golangci-lint \
+	$(MYGOBIN)/helmV3 \
+	$(MYGOBIN)/mdrip \
+	$(MYGOBIN)/stringer
+
+.PHONY: uninstall-out-of-tree-tools
+uninstall-out-of-tree-tools:
+	rm -f $(MYGOBIN)/goimports
+	rm -f $(MYGOBIN)/golangci-lint
+	rm -f $(MYGOBIN)/helmV3
+	rm -f $(MYGOBIN)/mdrip
+	rm -f $(MYGOBIN)/stringer
+
+.PHONY: $(MYGOBIN)/golangci-lint
+$(MYGOBIN)/golangci-lint:
+	cd $(REPO_ROOT)/hack && go install github.com/golangci/golangci-lint/cmd/golangci-lint
+
+.PHONY: $(MYGOBIN)/mdrip
+$(MYGOBIN)/mdrip:
+	cd $(REPO_ROOT)/hack && go install github.com/monopole/mdrip
+
+.PHONY: $(MYGOBIN)/stringer
+$(MYGOBIN)/stringer:
+	cd $(REPO_ROOT)/hack && go install golang.org/x/tools/cmd/stringer
+
+.PHONY: $(MYGOBIN)/goimports
+$(MYGOBIN)/goimports:
+	cd $(REPO_ROOT)/hack && go install golang.org/x/tools/cmd/goimports
+
+.PHONY: $(MYGOBIN)/mdtogo
+$(MYGOBIN)/mdtogo:
+	cd $(REPO_ROOT)/hack && go install sigs.k8s.io/kustomize/cmd/mdtogo
+
+.PHONY: $(MYGOBIN)/addlicense
+$(MYGOBIN)/addlicense:
+	cd $(REPO_ROOT)/hack && go install github.com/google/addlicense
+
+.PHONY: $(MYGOBIN)/kind
+$(MYGOBIN)/kind:
+	cd $(REPO_ROOT)/hack && go install sigs.k8s.io/kind
+
+.PHONY: $(MYGOBIN)/controller-gen
+$(MYGOBIN)/controller-gen:
+	cd $(REPO_ROOT)/hack && go install sigs.k8s.io/controller-tools/cmd/controller-gen
+
+.PHONY: $(MYGOBIN)/embedmd
+$(MYGOBIN)/embedmd:
+	cd $(REPO_ROOT)/hack && go install github.com/campoy/embedmd
+
+.PHONY: $(MYGOBIN)/go-bindata
+$(MYGOBIN)/go-bindata:
+	cd $(REPO_ROOT)/hack && go install github.com/go-bindata/go-bindata/v3/go-bindata
+
+.PHONY: $(MYGOBIN)/go-apidiff
+$(MYGOBIN)/go-apidiff:
+	cd $(REPO_ROOT)/hack && go install github.com/joelanford/go-apidiff
+
+.PHONY: $(MYGOBIN)/gh
+$(MYGOBIN)/gh:
+	cd $(REPO_ROOT)/hack && go install github.com/cli/cli/cmd/gh
+
+.PHONY: $(MYGOBIN)/kubeval
+$(MYGOBIN)/kubeval:
+	cd $(REPO_ROOT)/hack && go install github.com/instrumenta/kubeval
+
+# Helm V3 differs from helm V2; downloading it to provide coverage for the
+# chart inflator plugin under helm v3.
+.PHONY: $(MYGOBIN)/helmV3
+$(MYGOBIN)/helmV3:
+	( \
+		set -e; \
+		d=$(shell mktemp -d); cd $$d; \
+		tgzFile=helm-v3.10.2-$(GOOS)-$(GOARCH).tar.gz; \
+		wget https://get.helm.sh/$$tgzFile; \
+		tar -xvzf $$tgzFile; \
+		mv $(GOOS)-$(GOARCH)/helm $(MYGOBIN)/helmV3; \
+		rm -rf $$d \
+	)

OWNERS

@@ -1,4 +1,5 @@
 # See https://github.com/kubernetes/community/blob/master/community-membership.md
 approvers:
-  - kustomize-admins
-  - kustomize-maintainers
+  - kustomize-approvers
+reviewers:
+  - kustomize-reviewers

OWNERS_ALIASES

@@ -1,12 +1,38 @@
+# Keep *-owners and *-approvers lists in sync with *-admins and *-maintainers in
+# https://github.com/kubernetes/org/blob/main/config/kubernetes-sigs/sig-cli/teams.yaml
 aliases:
-  kustomize-admins:
-    - monopole
-    - pwittrock
-  kustomize-maintainers:
-    - droot
-    - justinsb
-    - liujingfang1
-    - mengqiy
-    - monopole
-    - pwittrock
-    - mortent
+  kustomize-owners:
+    - knverey
+    - koba1t
+  kustomize-approvers:
+    - knverey
+    - koba1t
+    - varshaprasad96
+  kustomize-reviewers:
+    - knverey
+    - koba1t
+    - stormqueen1990
+    - varshaprasad96
+    - ncapps
+
+  docs-approvers:
+    - ncapps
+  docs-reviewers:
+    - ncapps
+
+  commands-approvers: []
+  commands-reviewers:
+    - stormqueen1990
+
+  #  emeritus:
+  #    - liujingfang1
+  #    - Shell32-Natsu
+  #    - justinsb
+  #    - monopole
+  #    - pwittrock
+  #    - mengqiy
+  #    - mortent
+  #    - phanimarupaka
+  #    - natasha41575
+  #    - annasong20
+  #    - yuwenma

README.md

@@ -9,29 +9,51 @@ patch [kubernetes style] API objects.  It's like
 [`make`], in that what it does is declared in a file,
 and it's like [`sed`], in that it emits edited text.
 
-This tool is sponsored by [sig-cli] ([KEP]), and
-inspired by [DAM].
+This tool is sponsored by [sig-cli] ([KEP]).
+
+ - [Installation instructions](https://kubectl.docs.kubernetes.io/installation/kustomize/)
+ - [General documentation](https://kubectl.docs.kubernetes.io/references/kustomize/)
+ - [Examples](examples)
 
 [![Build Status](https://prow.k8s.io/badge.svg?jobs=kustomize-presubmit-master)](https://prow.k8s.io/job-history/kubernetes-jenkins/pr-logs/directory/kustomize-presubmit-master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/kubernetes-sigs/kustomize)](https://goreportcard.com/report/github.com/kubernetes-sigs/kustomize)
 
-Download a binary from the [release page], or see
-these [instructions](docs/INSTALL.md).
-
-Browse the [docs](docs) or jump right into the
-tested [examples](examples).
-
 ## kubectl integration
 
-Since [v1.14][kubectl announcement] the kustomize build system has been included in kubectl.
+To find the kustomize version embedded in recent versions of kubectl, run `kubectl version`:
 
-| kubectl version | kustomize version |
-|---------|--------|
-| v1.16.0 | [v2.0.3](/../../tree/v2.0.3) |
-| v1.15.x | [v2.0.3](/../../tree/v2.0.3) |
-| v1.14.x | [v2.0.3](/../../tree/v2.0.3) |
+```sh
+> kubectl version --client
+Client Version: v1.31.0
+Kustomize Version: v5.4.2
+```
 
-For examples and guides for using the kubectl integration please see the [kubectl book] or the [kubernetes documentation].
+The kustomize build flow at [v2.0.3] was added
+to [kubectl v1.14][kubectl announcement].  The kustomize
+flow in kubectl remained frozen at v2.0.3 until kubectl v1.21,
+which [updated it to v4.0.5][kust-in-kubectl update]. It will
+be updated on a regular basis going forward, and such updates
+will be reflected in the Kubernetes release notes.
+
+| Kubectl version | Kustomize version |
+| --------------- | ----------------- |
+| < v1.14         | n/a               |
+| v1.14-v1.20     | v2.0.3            |
+| v1.21           | v4.0.5            |
+| v1.22           | v4.2.0            |
+| v1.23           | v4.4.1            |
+| v1.24           | v4.5.4            |
+| v1.25           | v4.5.7            |
+| v1.26           | v4.5.7            |
+| v1.27           | v5.0.1            |
+
+[v2.0.3]: https://github.com/kubernetes-sigs/kustomize/releases/tag/v2.0.3
+[#2506]: https://github.com/kubernetes-sigs/kustomize/issues/2506
+[#1500]: https://github.com/kubernetes-sigs/kustomize/issues/1500
+[kust-in-kubectl update]: https://github.com/kubernetes/kubernetes/blob/4d75a6238a6e330337526e0513e67d02b1940b63/CHANGELOG/CHANGELOG-1.21.md#kustomize-updates-in-kubectl
+
+For examples and guides for using the kubectl integration please
+see the [kubernetes documentation].
 
 ## Usage
 
@@ -46,7 +68,37 @@ This file should declare those resources, and any
 customization to apply to them, e.g. _add a common
 label_.
 
-![base image][imageBase]
+```
+
+base: kustomization + resources
+
+kustomization.yaml                                      deployment.yaml                                                 service.yaml
++---------------------------------------------+         +-------------------------------------------------------+       +-----------------------------------+
+| apiVersion: kustomize.config.k8s.io/v1beta1 |         | apiVersion: apps/v1                                   |       | apiVersion: v1                    |
+| kind: Kustomization                         |         | kind: Deployment                                      |       | kind: Service                     |
+| labels:                                     |         | metadata:                                             |       | metadata:                         |
+| - includeSelectors: true                    |         |   name: myapp                                         |       |   name: myapp                     |
+|   pairs:                                    |         | spec:                                                 |       | spec:                             |
+|     app: myapp                              |         |   selector:                                           |       |   selector:                       |
+| resources:                                  |         |     matchLabels:                                      |       |     app: myapp                    |
+|   - deployment.yaml                         |         |       app: myapp                                      |       |   ports:                          |
+|   - service.yaml                            |         |   template:                                           |       |     - port: 6060                  |
+| configMapGenerator:                         |         |     metadata:                                         |       |       targetPort: 6060            |
+|   - name: myapp-map                         |         |       labels:                                         |       +-----------------------------------+
+|     literals:                               |         |         app: myapp                                    |
+|       - KEY=value                           |         |     spec:                                             |
++---------------------------------------------+         |       containers:                                     |
+                                                        |         - name: myapp                                 |
+                                                        |           image: myapp                                |
+                                                        |           resources:                                  |
+                                                        |             limits:                                   |
+                                                        |               memory: "128Mi"                         |
+                                                        |               cpu: "500m"                             |
+                                                        |           ports:                                      |
+                                                        |             - containerPort: 6060                     |
+                                                        +-------------------------------------------------------+
+
+```
 
 File structure:
 
@@ -82,20 +134,41 @@ Manage traditional [variants] of a configuration - like
 _development_, _staging_ and _production_ - using
 [overlays] that modify a common [base].
 
-![overlay image][imageOverlay]
+```
+
+overlay: kustomization + patches
+
+kustomization.yaml                                      replica_count.yaml                      cpu_count.yaml
++-----------------------------------------------+       +-------------------------------+       +------------------------------------------+
+| apiVersion: kustomize.config.k8s.io/v1beta1   |       | apiVersion: apps/v1           |       | apiVersion: apps/v1                      |
+| kind: Kustomization                           |       | kind: Deployment              |       | kind: Deployment                         |
+| labels:                                       |       | metadata:                     |       | metadata:                                |
+|  - includeSelectors: true                     |       |   name: myapp                 |       |   name: myapp                            |
+|    pairs:                                     |       | spec:                         |       | spec:                                    |
+|      variant: prod                            |       |   replicas: 80                |       |  template:                               |
+| resources:                                    |       +-------------------------------+       |     spec:                                |
+|   - ../../base                                |                                               |       containers:                        |
+| patches:                                      |                                               |         - name: myapp                    |
+|   - path: replica_count.yaml                  |                                               |           resources:                     |
+|   - path: cpu_count.yaml                      |                                               |             limits:                      |
++-----------------------------------------------+                                               |               memory: "128Mi"            |
+                                                                                                |               cpu: "7000m"               |
+                                                                                                +------------------------------------------+
+```
+
 
 File structure:
 > ```
 > ~/someApp
 > ├── base
-> │   ├── deployment.yaml
-> │   ├── kustomization.yaml
-> │   └── service.yaml
+> │   ├── deployment.yaml
+> │   ├── kustomization.yaml
+> │   └── service.yaml
 > └── overlays
 >     ├── development
->     │   ├── cpu_count.yaml
->     │   ├── kustomization.yaml
->     │   └── replica_count.yaml
+>     │   ├── cpu_count.yaml
+>     │   ├── kustomization.yaml
+>     │   └── replica_count.yaml
 >     └── production
 >         ├── cpu_count.yaml
 >         ├── kustomization.yaml
@@ -132,20 +205,9 @@ The YAML can be directly [applied] to a cluster:
 
 ## Community
 
-To file bugs please read [this](docs/bugs.md).
-
-Before working on an implementation, please
-
- * Read the [eschewed feature list].
- * File an issue describing
-   how the new feature would behave
-   and label it [kind/feature].
-
-### Other communication channels
-
-- [Slack]
-- [Mailing List]
-- General kubernetes [community page]
+- [file a bug](https://kubectl.docs.kubernetes.io/contributing/kustomize/bugs/)
+- [contribute a feature](https://kubectl.docs.kubernetes.io/contributing/kustomize/features/)
+- [propose a larger enhancement](https://github.com/kubernetes-sigs/kustomize/tree/master/proposals)
 
 ### Code of conduct
 
@@ -154,32 +216,20 @@ is governed by the [Kubernetes Code of Conduct].
 
 [`make`]: https://www.gnu.org/software/make
 [`sed`]: https://www.gnu.org/software/sed
-[DAM]: docs/glossary.md#declarative-application-management
-[KEP]: https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/0008-kustomize.md
+[DAM]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#declarative-application-management
+[KEP]: https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/2377-Kustomize/README.md
 [Kubernetes Code of Conduct]: code-of-conduct.md
-[Mailing List]: https://groups.google.com/forum/#!forum/kubernetes-sig-cli
-[Slack]: https://kubernetes.slack.com/messages/sig-cli
-[applied]: docs/glossary.md#apply
-[base]: docs/glossary.md#base
-[community page]: http://kubernetes.io/community/
-[declarative configuration]: docs/glossary.md#declarative-application-management
-[eschewed feature list]: docs/eschewedFeatures.md
-[imageBase]: docs/images/base.jpg
-[imageOverlay]: docs/images/overlay.jpg
-[kind/feature]: /../../labels/kind%2Ffeature
+[applied]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#apply
+[base]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#base
+[declarative configuration]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#declarative-application-management
 [kubectl announcement]: https://kubernetes.io/blog/2019/03/25/kubernetes-1-14-release-announcement
-[kubectl book]: https://kubectl.docs.kubernetes.io/pages/app_customization/introduction.html
 [kubernetes documentation]: https://kubernetes.io/docs/tasks/manage-kubernetes-objects/kustomization/
-[kubernetes style]: docs/glossary.md#kubernetes-style-object
-[kustomization]: docs/glossary.md#kustomization
-[overlay]: docs/glossary.md#overlay
-[overlays]: docs/glossary.md#overlay
-[release page]: /../../releases
-[resource]: docs/glossary.md#resource
-[resources]: docs/glossary.md#resource
+[kubernetes style]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#kubernetes-style-object
+[kustomization]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#kustomization
+[overlay]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#overlay
+[overlays]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#overlay
+[release page]: https://github.com/kubernetes-sigs/kustomize/releases
+[resource]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#resource
+[resources]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#resource
 [sig-cli]: https://github.com/kubernetes/community/blob/master/sig-cli/README.md
-[variant]: docs/glossary.md#variant
-[variants]: docs/glossary.md#variant
-[v2.0.3]: /../../releases/tag/v2.0.3
-[v2.1.0]: /../../releases/tag/v2.1.0
-[workflows]: docs/workflows.md
+[variants]: https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#variant

ROADMAP.md

@@ -0,0 +1,185 @@
+# Kustomize roadmap 2023-2024
+
+This document describes the items that we hope to make progress on over the next
+1 year (H2 2023 and H1 2024). Take this roadmap as more of what we hope to achieve
+rather than what we promise to achieve, as some items in this doc are highly dependent
+on the success that we have on-ramping new contributors to the project, and other
+items will depend on external contributions, which can vary.
+
+If you are interested in contributing to a particular area, you can look through
+the project board for that area and assign yourself to one of the issues. It is
+recommended to start with smaller issues to ramp up on the project before starting
+to tackle larger issues.
+
+Project boards:
+https://github.com/orgs/kubernetes-sigs/projects/50
+https://github.com/orgs/kubernetes-sigs/projects/51
+https://github.com/orgs/kubernetes-sigs/projects/52
+https://github.com/orgs/kubernetes-sigs/projects/53
+https://github.com/orgs/kubernetes-sigs/projects/54
+
+## Kustomize contributors (at time of writing):
+
+kustomize owner: @natasha41575
+
+kustomize maintainers: @annasong20, @koba1t
+
+kustomize contributors: @varshaprasad96
+
+
+# H2 2023
+
+## Goal: Create kustomize leadership and contributor playbooks
+
+Contributors: natasha41575, annasong20
+
+Priority: High
+
+Effort: Medium
+
+In the past, when the leads stopped contributing (for various reasons, not covered here)
+in various kubernetes projects, it left a wide hole that few could easily fill,
+leaving the remaining leads in a bad position and the project understaffed. We should assume
+that we will need to onboard new maintainers in the future, and should have playbooks
+for doing so. As we grow the contributor base in kustomize, we will build these playbooks for
+those who are contributing and those who are looking to grow into kustomize leaders.
+To ensure the long term health and stability of the project, we should have:
+
+- On-boarding guides for new contributors
+- Clear guidelines for how to climb the kustomize ladder from contributor to approver to owner
+- A plan (maybe a schedule) for future kustomize cohorts
+- A succession plan, in case the current kustomize leads ever decide to step down
+
+## Goal: Onboard 2-5 new contributors to kustomize
+
+Contributors: natasha41575, annasong20, koba1t
+
+Priority: High
+
+Effort: High
+
+In order to make progress on kustomize goals in the future, we need to increase the
+level of staffing on kustomize. We should leverage community contributions to keep kustomize
+healthy and making progress.
+
+The primary means in which we will try to find new kustomize contributors is through the new kustomize
+maintainer training cohort. We will lead a group of ~20 kubernetes community members through a 3-6 month
+training program, involving talk sessions, bug scrubs, issue triage, PR reviews, and coding projects for
+each member.
+
+See [our call for help](https://groups.google.com/a/kubernetes.io/g/dev/c/M5OphEVsv5o/m/zc6G4H15AAAJ) for more
+specific details about the program.
+
+The effort from existing kustomize maintainers here will be to:
+- Organize the cohort, so that each cohort member feels productive and understands what they should work on
+- Align motivation of the cohort members with the work that we assign to them.
+- Review PRs from cohort members in a timely manner.
+- Be the point(s) of contact for questions/escalations
+- Lead weekly stand-ups and monthly bug scrubs
+
+At the end of all this, if we have a small team of contributors to kustomize, who understand its founding
+philosophy and intentions, we should be able to keep the project up to date.
+
+## Goal: Improve kustomize extensibility through KRM functions and CRD support
+
+Contributors: koba1t, varshaprasad96, external contributors
+
+Priority: High
+
+Effort: High
+
+Project board: https://github.com/orgs/kubernetes-sigs/projects/53/views/1
+
+For a long time, we have supported KRM functions as the proper way to implement custom generators and transformers.
+However, due to limited staffing, we have been unable to drive this feature out of alpha in kustomize. The two
+main features which we hope to make progress on are Composition and Catalog, two long-standing proposals for which
+numerous users have been waiting for a long time. There are several open issues
+regarding KRM functions where our long-term answer has been these two features, but users have been hearing about them
+for over a year without seeing any progress. If we can implement them, they will vastly improve usability and security
+of KRM functions.
+
+One item that falls under this category that does not currently have a contributor is improving CRD support.
+Currently, it is difficult to use CRDs properly, as there are three different fields (configurations, openapi, and crds)
+where users have to input their CRD configuration. We need to consolidate these fields into one easy to use feature to
+support CRDs. If you are interested in putting together a design proposal for how to tackle this task, please reach
+out to the kustomize maintainers.
+
+# H1 2024
+
+## Goal: Improve the kustomize documentation
+
+Contributors: annasong20, external contributions
+
+Priority: High
+
+Effort: High
+
+Project board: https://github.com/orgs/kubernetes-sigs/projects/50
+
+The kustomize documentation is currently fragmented, out of date, and lacks examples to fully understand its value.
+We have had a "docs project" for a long time; we need to prioritize implementing it so that the documentation is in
+one place, easy to find, and helps new users get started more easily. Some outcomes from this project should be:
+
+- A single, unified website hosted on kustomize.io
+- Updated information architecture, and a plan to keep it up to date
+- End to end examples of using kustomize, including complex use cases
+
+## Goal: Fix core usability bugs in kustomize
+
+Contributors: external contributions
+
+Priority: High
+
+Effort: High
+
+Project board: https://github.com/orgs/kubernetes-sigs/projects/51
+
+There are several core usability issues that block some users from adopting kustomize features or in
+some base block users from using kustomize entirely. These issues range from small bugs with workable but
+inconvenient workarounds, to enormous feature gaps.
+
+As part of this goal, we should work toward reducing the number of such issues that we have, making
+kustomize work more smoothly and predictably, and be usable for a larger range of users.
+
+There are a lot of important issues in this project, but the biggest and highest priority one is that
+kustomize doesn't currently support metadata.GenerateName. Unfortunately, we don't currently have anyone
+actively working on this issue, we would need an external contributor to reach out to the kustomize
+maintainers to pick it up.
+
+## Goal: Improve kustomize CI, release, & security patch processes
+
+Contributors: external contributions
+
+Priority: Medium
+
+Effort: High
+
+Project board: https://github.com/orgs/kubernetes-sigs/projects/54
+
+The kustomize release process is currently done on-demand and is strictly linear. This means that if we find a CVE,
+we are forced to release the next version of kustomize ASAP, and we are required to release every PR that has merged
+since the last release. This can put us in a sticky situation if we have a breaking change that we are
+not ready to release yet, but we need a patch quickly.
+
+We should try to improve the kustomize release process so that we can release frequently, reliably, and with some
+flexibility. The outcome of this effort should be:
+
+- kustomize is released on a regular cadence (biweekly or monthly)
+- kustomize is able to separate patch and feature releases, so that we can fix CVEs without needing to release
+everything that we have in flight
+- We can detect and fix CVEs early
+
+## Goal: Take long-standing alpha commands out of alpha
+
+Contributors: external contributions
+
+Priority: Medium
+
+Effort: Medium
+
+Project board: https://github.com/orgs/kubernetes-sigs/projects/52
+
+There are several commands in kustomize that have been alpha for a long time, including the cfg command group and
+localize. Moving them forward can indicate good health of a project and these commands are useful to many users.
+Some of these projects can be good starter issues for new contributors to have an easier onramp while others will
+require more effort and thought.

SECURITY_CONTACTS

@@ -9,7 +9,7 @@
 #
 # DO NOT REPORT SECURITY VULNERABILITIES DIRECTLY TO THESE NAMES, FOLLOW THE
 # INSTRUCTIONS AT https://kubernetes.io/security/
-
-monopole
-Liujingfang1
-pwittrock
+eddiezane
+KnVerey
+natasha41575
+soltysh

api/Makefile

@@ -0,0 +1,28 @@
+# Copyright 2022 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+include ../Makefile-modules.mk
+
+test:
+	go test -v -timeout 45m -cover ./... -ldflags "-X sigs.k8s.io/kustomize/api/provenance.buildDate=2023-01-31T23:38:41Z -X sigs.k8s.io/kustomize/api/provenance.version=(test)"
+
+build:
+	go build -ldflags "-X sigs.k8s.io/kustomize/api/provenance.buildDate=$(shell date -u +"%Y-%m-%dT%H:%M:%SZ")" ./...
+
+generate: $(MYGOBIN)/k8scopy $(MYGOBIN)/stringer
+	go generate ./...
+
+lint: lint-api-static
+
+## lint-api-static runs the linter on the API module
+## with build-tag kustomize_disable_go_plugin_support
+## this aims to catch any issues with the API module
+## that would prevent the API module from being used
+## when the go plugin support is disabled.
+lint-api-static:
+	$(MYGOBIN)/golangci-lint cache clean # Workaround for https://github.com/golangci/golangci-lint/issues/3228
+	$(MYGOBIN)/golangci-lint \
+	  -c $$KUSTOMIZE_ROOT/.golangci.yml \
+	  --build-tags kustomize_disable_go_plugin_support \
+	  --path-prefix api \
+	  run ./...

api/builtins/ImageTagTransformer.go

@@ -1,187 +0,0 @@
-// Code generated by pluginator on ImageTagTransformer; DO NOT EDIT.
-// pluginator {unknown  1970-01-01T00:00:00Z  }
-
-package builtins
-
-import (
-	"fmt"
-	"regexp"
-	"strings"
-
-	"sigs.k8s.io/kustomize/api/transform"
-	"sigs.k8s.io/kustomize/api/types"
-
-	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/yaml"
-)
-
-// Find matching image declarations and replace
-// the name, tag and/or digest.
-type ImageTagTransformerPlugin struct {
-	ImageTag   types.Image       `json:"imageTag,omitempty" yaml:"imageTag,omitempty"`
-	FieldSpecs []types.FieldSpec `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
-}
-
-func (p *ImageTagTransformerPlugin) Config(
-	_ *resmap.PluginHelpers, c []byte) (err error) {
-	p.ImageTag = types.Image{}
-	p.FieldSpecs = nil
-	return yaml.Unmarshal(c, p)
-}
-
-func (p *ImageTagTransformerPlugin) Transform(m resmap.ResMap) error {
-	for _, r := range m.Resources() {
-		for _, path := range p.FieldSpecs {
-			if !r.OrgId().IsSelected(&path.Gvk) {
-				continue
-			}
-			err := transform.MutateField(
-				r.Map(), path.PathSlice(), false, p.mutateImage)
-			if err != nil {
-				return err
-			}
-		}
-		// Kept for backward compatibility
-		if err := p.findAndReplaceImage(r.Map()); err != nil && r.OrgId().Kind != `CustomResourceDefinition` {
-			return err
-		}
-	}
-	return nil
-}
-
-func (p *ImageTagTransformerPlugin) mutateImage(in interface{}) (interface{}, error) {
-	original, ok := in.(string)
-	if !ok {
-		return nil, fmt.Errorf("image path is not of type string but %T", in)
-	}
-
-	if !isImageMatched(original, p.ImageTag.Name) {
-		return original, nil
-	}
-	name, tag := split(original)
-	if p.ImageTag.NewName != "" {
-		name = p.ImageTag.NewName
-	}
-	if p.ImageTag.NewTag != "" {
-		tag = ":" + p.ImageTag.NewTag
-	}
-	if p.ImageTag.Digest != "" {
-		tag = "@" + p.ImageTag.Digest
-	}
-	return name + tag, nil
-}
-
-// findAndReplaceImage replaces the image name and
-// tags inside one object.
-// It searches the object for container session
-// then loops though all images inside containers
-// session, finds matched ones and update the
-// image name and tag name
-func (p *ImageTagTransformerPlugin) findAndReplaceImage(obj map[string]interface{}) error {
-	paths := []string{"containers", "initContainers"}
-	updated := false
-	for _, path := range paths {
-		containers, found := obj[path]
-		if found && containers != nil {
-			if _, err := p.updateContainers(containers); err != nil {
-				return err
-			}
-			updated = true
-		}
-	}
-	if !updated {
-		return p.findContainers(obj)
-	}
-	return nil
-}
-
-func (p *ImageTagTransformerPlugin) updateContainers(in interface{}) (interface{}, error) {
-	containers, ok := in.([]interface{})
-	if !ok {
-		return nil, fmt.Errorf(
-			"containers path is not of type []interface{} but %T", in)
-	}
-	for i := range containers {
-		container := containers[i].(map[string]interface{})
-		containerImage, found := container["image"]
-		if !found {
-			continue
-		}
-		imageName := containerImage.(string)
-		if isImageMatched(imageName, p.ImageTag.Name) {
-			newImage, err := p.mutateImage(imageName)
-			if err != nil {
-				return nil, err
-			}
-			container["image"] = newImage
-		}
-	}
-	return containers, nil
-}
-
-func (p *ImageTagTransformerPlugin) findContainers(obj map[string]interface{}) error {
-	for key := range obj {
-		switch typedV := obj[key].(type) {
-		case map[string]interface{}:
-			err := p.findAndReplaceImage(typedV)
-			if err != nil {
-				return err
-			}
-		case []interface{}:
-			for i := range typedV {
-				item := typedV[i]
-				typedItem, ok := item.(map[string]interface{})
-				if ok {
-					err := p.findAndReplaceImage(typedItem)
-					if err != nil {
-						return err
-					}
-				}
-			}
-		}
-	}
-	return nil
-}
-
-func isImageMatched(s, t string) bool {
-	// Tag values are limited to [a-zA-Z0-9_.{}-].
-	// Some tools like Bazel rules_k8s allow tag patterns with {} characters.
-	// More info: https://github.com/bazelbuild/rules_k8s/pull/423
-	pattern, _ := regexp.Compile("^" + t + "(@sha256)?(:[a-zA-Z0-9_.{}-]*)?$")
-	return pattern.MatchString(s)
-}
-
-// split separates and returns the name and tag parts
-// from the image string using either colon `:` or at `@` separators.
-// Note that the returned tag keeps its separator.
-func split(imageName string) (name string, tag string) {
-	// check if image name contains a domain
-	// if domain is present, ignore domain and check for `:`
-	ic := -1
-	if slashIndex := strings.Index(imageName, "/"); slashIndex < 0 {
-		ic = strings.LastIndex(imageName, ":")
-	} else {
-		lastIc := strings.LastIndex(imageName[slashIndex:], ":")
-		// set ic only if `:` is present
-		if lastIc > 0 {
-			ic = slashIndex + lastIc
-		}
-	}
-	ia := strings.LastIndex(imageName, "@")
-	if ic < 0 && ia < 0 {
-		return imageName, ""
-	}
-
-	i := ic
-	if ia > 0 {
-		i = ia
-	}
-
-	name = imageName[:i]
-	tag = imageName[i:]
-	return
-}
-
-func NewImageTagTransformerPlugin() resmap.TransformerPlugin {
-	return &ImageTagTransformerPlugin{}
-}

api/builtins/LegacyOrderTransformer.go

@@ -1,46 +0,0 @@
-// Code generated by pluginator on LegacyOrderTransformer; DO NOT EDIT.
-// pluginator {unknown  1970-01-01T00:00:00Z  }
-
-package builtins
-
-import (
-	"sort"
-
-	"github.com/pkg/errors"
-	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
-)
-
-// Sort the resources using an ordering defined in the Gvk class.
-// This puts cluster-wide basic resources with no
-// dependencies (like Namespace, StorageClass, etc.)
-// first, and resources with a high number of dependencies
-// (like ValidatingWebhookConfiguration) last.
-type LegacyOrderTransformerPlugin struct{}
-
-// Nothing needed for configuration.
-func (p *LegacyOrderTransformerPlugin) Config(
-	_ *resmap.PluginHelpers, _ []byte) (err error) {
-	return nil
-}
-
-func (p *LegacyOrderTransformerPlugin) Transform(m resmap.ResMap) (err error) {
-	resources := make([]*resource.Resource, m.Size())
-	ids := m.AllIds()
-	sort.Sort(resmap.IdSlice(ids))
-	for i, id := range ids {
-		resources[i], err = m.GetByCurrentId(id)
-		if err != nil {
-			return errors.Wrap(err, "expected match for sorting")
-		}
-	}
-	m.Clear()
-	for _, r := range resources {
-		m.Append(r)
-	}
-	return nil
-}
-
-func NewLegacyOrderTransformerPlugin() resmap.TransformerPlugin {
-	return &LegacyOrderTransformerPlugin{}
-}

api/builtins/NamespaceTransformer.go

@@ -1,150 +0,0 @@
-// Code generated by pluginator on NamespaceTransformer; DO NOT EDIT.
-// pluginator {unknown  1970-01-01T00:00:00Z  }
-
-package builtins
-
-import (
-	"fmt"
-
-	"sigs.k8s.io/kustomize/api/filters/namespace"
-	"sigs.k8s.io/kustomize/api/resid"
-	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
-	"sigs.k8s.io/kustomize/api/transform"
-	"sigs.k8s.io/kustomize/api/types"
-	"sigs.k8s.io/kustomize/kyaml/filtersutil"
-	"sigs.k8s.io/yaml"
-)
-
-// Change or set the namespace of non-cluster level resources.
-type NamespaceTransformerPlugin struct {
-	types.ObjectMeta `json:"metadata,omitempty" yaml:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
-	FieldSpecs       []types.FieldSpec `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
-
-	// YAMLSupport can be set to true to use the kyaml filter instead of the
-	// kunstruct transformer.
-	// TODO: change the default to use kyaml when it is stable
-	YAMLSupport bool `json:"yamlSupport,omitempty" yaml:"yamlSupport,omitempty"`
-}
-
-func (p *NamespaceTransformerPlugin) Config(
-	_ *resmap.PluginHelpers, c []byte) (err error) {
-	p.Namespace = ""
-	p.FieldSpecs = nil
-	return yaml.Unmarshal(c, p)
-}
-
-func (p *NamespaceTransformerPlugin) Transform(m resmap.ResMap) error {
-	if len(p.Namespace) == 0 {
-		return nil
-	}
-	for _, r := range m.Resources() {
-		if len(r.Map()) == 0 {
-			// Don't mutate empty objects?
-			continue
-		}
-
-		id := r.OrgId()
-
-		if p.YAMLSupport {
-			// use the new style transform
-			err := filtersutil.ApplyToJSON(namespace.Filter{
-				Namespace: p.Namespace,
-				FsSlice:   p.FieldSpecs,
-			}, r.Kunstructured)
-			if err != nil {
-				return err
-			}
-		} else {
-			// use the old style transform
-			applicableFs := p.applicableFieldSpecs(id)
-			for _, fs := range applicableFs {
-				err := transform.MutateField(
-					r.Map(), fs.PathSlice(), fs.CreateIfNotPresent,
-					p.changeNamespace(r))
-				if err != nil {
-					return err
-				}
-			}
-		}
-
-		matches := m.GetMatchingResourcesByCurrentId(r.CurId().Equals)
-		if len(matches) != 1 {
-			return fmt.Errorf(
-				"namespace transformation produces ID conflict: %+v", matches)
-		}
-	}
-	return nil
-}
-
-// Special casing metadata.namespace since
-// all objects have it, even "ClusterKind" objects
-// that don't exist in a namespace (the Namespace
-// object itself doesn't live in a namespace).
-func (p *NamespaceTransformerPlugin) applicableFieldSpecs(id resid.ResId) []types.FieldSpec {
-	var res []types.FieldSpec
-	for _, fs := range p.FieldSpecs {
-		if id.IsSelected(&fs.Gvk) &&
-			(fs.Path != types.MetadataNamespacePath ||
-				(fs.Path == types.MetadataNamespacePath && id.IsNamespaceableKind())) {
-			res = append(res, fs)
-		}
-	}
-	return res
-}
-
-func (p *NamespaceTransformerPlugin) changeNamespace(
-	_ *resource.Resource) func(in interface{}) (interface{}, error) {
-	return func(in interface{}) (interface{}, error) {
-		switch in.(type) {
-		case string:
-			// will happen when the metadata/namespace
-			// value is replaced
-			return p.Namespace, nil
-		case []interface{}:
-			l, _ := in.([]interface{})
-			for idx, item := range l {
-				switch item.(type) {
-				case map[string]interface{}:
-					// Will happen when mutating the subjects
-					// field of ClusterRoleBinding and RoleBinding
-					inMap, _ := item.(map[string]interface{})
-					if _, ok := inMap["name"]; !ok {
-						continue
-					}
-					name, ok := inMap["name"].(string)
-					if !ok {
-						continue
-					}
-					// The only case we need to force the namespace
-					// if for the "service account". "default" is
-					// kind of hardcoded here for right now.
-					if name != "default" {
-						continue
-					}
-					inMap["namespace"] = p.Namespace
-					l[idx] = inMap
-				default:
-					// nothing to do for right now
-				}
-			}
-			return in, nil
-		case map[string]interface{}:
-			// Will happen if the createField=true
-			// when the namespace is added to the
-			// object
-			inMap := in.(map[string]interface{})
-			if len(inMap) == 0 {
-				return p.Namespace, nil
-			} else {
-				return in, nil
-			}
-		default:
-			return in, nil
-		}
-	}
-}
-
-func NewNamespaceTransformerPlugin() resmap.TransformerPlugin {
-	return &NamespaceTransformerPlugin{}
-}

api/builtins/PatchStrategicMergeTransformer.go

@@ -1,117 +0,0 @@
-// Code generated by pluginator on PatchStrategicMergeTransformer; DO NOT EDIT.
-// pluginator {unknown  1970-01-01T00:00:00Z  }
-
-package builtins
-
-import (
-	"encoding/json"
-	"fmt"
-
-	kyaml "sigs.k8s.io/kustomize/kyaml/yaml"
-
-	"sigs.k8s.io/kustomize/api/filters/patchstrategicmerge"
-	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
-	"sigs.k8s.io/kustomize/api/types"
-	"sigs.k8s.io/kustomize/kyaml/filtersutil"
-	"sigs.k8s.io/yaml"
-)
-
-type PatchStrategicMergeTransformerPlugin struct {
-	h             *resmap.PluginHelpers
-	loadedPatches []*resource.Resource
-	Paths         []types.PatchStrategicMerge `json:"paths,omitempty" yaml:"paths,omitempty"`
-	Patches       string                      `json:"patches,omitempty" yaml:"patches,omitempty"`
-
-	YAMLSupport bool `json:"yamlSupport,omitempty" yaml:"yamlSupport,omitempty"`
-}
-
-func (p *PatchStrategicMergeTransformerPlugin) Config(
-	h *resmap.PluginHelpers, c []byte) (err error) {
-	p.h = h
-	err = yaml.Unmarshal(c, p)
-	if err != nil {
-		return err
-	}
-	if len(p.Paths) == 0 && p.Patches == "" {
-		return fmt.Errorf("empty file path and empty patch content")
-	}
-	if len(p.Paths) != 0 {
-		for _, onePath := range p.Paths {
-			res, err := p.h.ResmapFactory().RF().SliceFromBytes([]byte(onePath))
-			if err == nil {
-				p.loadedPatches = append(p.loadedPatches, res...)
-				continue
-			}
-			res, err = p.h.ResmapFactory().RF().SliceFromPatches(
-				p.h.Loader(), []types.PatchStrategicMerge{onePath})
-			if err != nil {
-				return err
-			}
-			p.loadedPatches = append(p.loadedPatches, res...)
-		}
-	}
-	if p.Patches != "" {
-		res, err := p.h.ResmapFactory().RF().SliceFromBytes([]byte(p.Patches))
-		if err != nil {
-			return err
-		}
-		p.loadedPatches = append(p.loadedPatches, res...)
-	}
-
-	if len(p.loadedPatches) == 0 {
-		return fmt.Errorf(
-			"patch appears to be empty; files=%v, Patch=%s", p.Paths, p.Patches)
-	}
-	return err
-}
-
-func (p *PatchStrategicMergeTransformerPlugin) Transform(m resmap.ResMap) error {
-	patches, err := p.h.ResmapFactory().MergePatches(p.loadedPatches)
-	if err != nil {
-		return err
-	}
-	for _, patch := range patches.Resources() {
-		target, err := m.GetById(patch.OrgId())
-		if err != nil {
-			return err
-		}
-		if !p.YAMLSupport {
-			err = target.Patch(patch.Kunstructured)
-			if err != nil {
-				return err
-			}
-			// remove the resource from resmap
-			// when the patch is to $patch: delete that target
-			if len(target.Map()) == 0 {
-				err = m.Remove(target.CurId())
-				if err != nil {
-					return err
-				}
-			}
-		} else {
-			node, err := getRNode(patch)
-			if err != nil {
-				return err
-			}
-			err = filtersutil.ApplyToJSON(patchstrategicmerge.Filter{
-				Patch: node,
-			}, target.Kunstructured)
-		}
-	}
-	return nil
-}
-
-//TODO: Remove this once the next version of kyaml is released which
-// exposes GetRNode from the filutersutil package.
-func getRNode(k json.Marshaler) (*kyaml.RNode, error) {
-	j, err := k.MarshalJSON()
-	if err != nil {
-		return nil, err
-	}
-	return kyaml.Parse(string(j))
-}
-
-func NewPatchStrategicMergeTransformerPlugin() resmap.TransformerPlugin {
-	return &PatchStrategicMergeTransformerPlugin{}
-}

api/builtins/PatchTransformer.go

@@ -1,193 +0,0 @@
-// Code generated by pluginator on PatchTransformer; DO NOT EDIT.
-// pluginator {unknown  1970-01-01T00:00:00Z  }
-
-package builtins
-
-import (
-	"fmt"
-	"strings"
-
-	jsonpatch "github.com/evanphx/json-patch"
-	"github.com/pkg/errors"
-	"sigs.k8s.io/kustomize/api/filters/patchjson6902"
-	"sigs.k8s.io/kustomize/api/filters/patchstrategicmerge"
-	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
-	"sigs.k8s.io/kustomize/api/types"
-	"sigs.k8s.io/kustomize/kyaml/filtersutil"
-	"sigs.k8s.io/yaml"
-)
-
-type PatchTransformerPlugin struct {
-	loadedPatch  *resource.Resource
-	decodedPatch jsonpatch.Patch
-	Path         string          `json:"path,omitempty" yaml:"path,omitempty"`
-	Patch        string          `json:"patch,omitempty" yaml:"patch,omitempty"`
-	Target       *types.Selector `json:"target,omitempty" yaml:"target,omitempty"`
-
-	YAMLSupport bool `json:"yamlSupport,omitempty" yaml:"yamlSupport,omitempty"`
-}
-
-func (p *PatchTransformerPlugin) Config(
-	h *resmap.PluginHelpers, c []byte) error {
-	err := yaml.Unmarshal(c, p)
-	if err != nil {
-		return err
-	}
-	p.Patch = strings.TrimSpace(p.Patch)
-	if p.Patch == "" && p.Path == "" {
-		return fmt.Errorf(
-			"must specify one of patch and path in\n%s", string(c))
-	}
-	if p.Patch != "" && p.Path != "" {
-		return fmt.Errorf(
-			"patch and path can't be set at the same time\n%s", string(c))
-	}
-
-	if p.Path != "" {
-		loaded, loadErr := h.Loader().Load(p.Path)
-		if loadErr != nil {
-			return loadErr
-		}
-		p.Patch = string(loaded)
-	}
-
-	patchSM, errSM := h.ResmapFactory().RF().FromBytes([]byte(p.Patch))
-	patchJson, errJson := jsonPatchFromBytes([]byte(p.Patch))
-	if (errSM == nil && errJson == nil) ||
-		(patchSM != nil && patchJson != nil) {
-		return fmt.Errorf(
-			"illegally qualifies as both an SM and JSON patch: [%v]",
-			p.Patch)
-	}
-	if errSM != nil && errJson != nil {
-		return fmt.Errorf(
-			"unable to parse SM or JSON patch from [%v]", p.Patch)
-	}
-	if errSM == nil {
-		p.loadedPatch = patchSM
-	} else {
-		p.decodedPatch = patchJson
-	}
-	return nil
-}
-
-func (p *PatchTransformerPlugin) Transform(m resmap.ResMap) error {
-	if p.loadedPatch != nil {
-		// The patch was a strategic merge patch
-		return p.transformStrategicMerge(m, p.loadedPatch)
-	} else {
-		return p.transformJson6902(m, p.decodedPatch)
-	}
-}
-
-// transformStrategicMerge applies the provided strategic merge patch
-// to all the resources in the ResMap that match either the Target or
-// the identifier of the patch.
-func (p *PatchTransformerPlugin) transformStrategicMerge(m resmap.ResMap, patch *resource.Resource) error {
-	if p.Target == nil {
-		target, err := m.GetById(patch.OrgId())
-		if err != nil {
-			return err
-		}
-		return p.applySMPatch(target, patch)
-	}
-
-	resources, err := m.Select(*p.Target)
-	if err != nil {
-		return err
-	}
-	for _, res := range resources {
-		patchCopy := patch.DeepCopy()
-		patchCopy.SetName(res.GetName())
-		patchCopy.SetNamespace(res.GetNamespace())
-		patchCopy.SetGvk(res.GetGvk())
-		err := p.applySMPatch(res, patchCopy)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// applySMPatch applies the provided strategic merge patch to the
-// given resource. Depending on the value of YAMLSupport, it will either
-// use the legacy implementation or the kyaml-based solution.
-func (p *PatchTransformerPlugin) applySMPatch(resource, patch *resource.Resource) error {
-	if !p.YAMLSupport {
-		return resource.Patch(patch.Kunstructured)
-	} else {
-		node, err := filtersutil.GetRNode(patch)
-		if err != nil {
-			return err
-		}
-		return filtersutil.ApplyToJSON(patchstrategicmerge.Filter{
-			Patch: node,
-		}, resource.Kunstructured)
-	}
-}
-
-// transformJson6902 applies the provided json6902 patch
-// to all the resources in the ResMap that match the Target.
-func (p *PatchTransformerPlugin) transformJson6902(m resmap.ResMap, patch jsonpatch.Patch) error {
-	if p.Target == nil {
-		return fmt.Errorf("must specify a target for patch %s", p.Patch)
-	}
-
-	resources, err := m.Select(*p.Target)
-	if err != nil {
-		return err
-	}
-	for _, res := range resources {
-		err = p.applyJson6902Patch(res, patch)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// applyJson6902Patch applies the provided patch to the given resource.
-// Depending on the value of YAMLSupport, it will either
-// use the legacy implementation or the kyaml-based solution.
-func (p *PatchTransformerPlugin) applyJson6902Patch(resource *resource.Resource, patch jsonpatch.Patch) error {
-	if !p.YAMLSupport {
-		rawObj, err := resource.MarshalJSON()
-		if err != nil {
-			return err
-		}
-		modifiedObj, err := patch.Apply(rawObj)
-		if err != nil {
-			return errors.Wrapf(
-				err, "failed to apply json patch '%s'", p.Patch)
-		}
-		return resource.UnmarshalJSON(modifiedObj)
-	} else {
-		return filtersutil.ApplyToJSON(patchjson6902.Filter{
-			Patch: p.Patch,
-		}, resource.Kunstructured)
-	}
-}
-
-// jsonPatchFromBytes loads a Json 6902 patch from
-// a bytes input
-func jsonPatchFromBytes(
-	in []byte) (jsonpatch.Patch, error) {
-	ops := string(in)
-	if ops == "" {
-		return nil, fmt.Errorf("empty json patch operations")
-	}
-
-	if ops[0] != '[' {
-		jsonOps, err := yaml.YAMLToJSON(in)
-		if err != nil {
-			return nil, err
-		}
-		ops = string(jsonOps)
-	}
-	return jsonpatch.DecodePatch([]byte(ops))
-}
-
-func NewPatchTransformerPlugin() resmap.TransformerPlugin {
-	return &PatchTransformerPlugin{}
-}

api/builtins/PrefixSuffixTransformer.go

@@ -1,123 +0,0 @@
-// Code generated by pluginator on PrefixSuffixTransformer; DO NOT EDIT.
-// pluginator {unknown  1970-01-01T00:00:00Z  }
-
-package builtins
-
-import (
-	"errors"
-	"fmt"
-
-	"sigs.k8s.io/kustomize/api/transform"
-	"sigs.k8s.io/kustomize/api/types"
-
-	"sigs.k8s.io/kustomize/api/resid"
-	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/yaml"
-)
-
-// Add the given prefix and suffix to the field.
-type PrefixSuffixTransformerPlugin struct {
-	Prefix     string            `json:"prefix,omitempty" yaml:"prefix,omitempty"`
-	Suffix     string            `json:"suffix,omitempty" yaml:"suffix,omitempty"`
-	FieldSpecs []types.FieldSpec `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
-}
-
-// Not placed in a file yet due to lack of demand.
-var prefixSuffixFieldSpecsToSkip = []types.FieldSpec{
-	{
-		Gvk: resid.Gvk{Kind: "CustomResourceDefinition"},
-	},
-	{
-		Gvk: resid.Gvk{Group: "apiregistration.k8s.io", Kind: "APIService"},
-	},
-}
-
-func (p *PrefixSuffixTransformerPlugin) Config(
-	_ *resmap.PluginHelpers, c []byte) (err error) {
-	p.Prefix = ""
-	p.Suffix = ""
-	p.FieldSpecs = nil
-	err = yaml.Unmarshal(c, p)
-	if err != nil {
-		return
-	}
-	if p.FieldSpecs == nil {
-		return errors.New("fieldSpecs is not expected to be nil")
-	}
-	return
-}
-
-func (p *PrefixSuffixTransformerPlugin) Transform(m resmap.ResMap) error {
-
-	// Even if both the Prefix and Suffix are empty we want
-	// to proceed with the transformation. This allows to add contextual
-	// information to the resources (AddNamePrefix and AddNameSuffix).
-
-	for _, r := range m.Resources() {
-		if p.shouldSkip(r.OrgId()) {
-			// Don't change the actual definition
-			// of a CRD.
-			continue
-		}
-		id := r.OrgId()
-		// current default configuration contains
-		// only one entry: "metadata/name" with no GVK
-		for _, path := range p.FieldSpecs {
-			if !id.IsSelected(&path.Gvk) {
-				// With the currrent default configuration,
-				// because no Gvk is specified, so a wild
-				// card
-				continue
-			}
-
-			if smellsLikeANameChange(&path) {
-				// "metadata/name" is the only field.
-				// this will add a prefix and a suffix
-				// to the resource even if those are
-				// empty
-				r.AddNamePrefix(p.Prefix)
-				r.AddNameSuffix(p.Suffix)
-			}
-
-			// the addPrefixSuffix method will not
-			// change the name if both the prefix and suffix
-			// are empty.
-			err := transform.MutateField(
-				r.Map(),
-				path.PathSlice(),
-				path.CreateIfNotPresent,
-				p.addPrefixSuffix)
-			if err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
-func smellsLikeANameChange(fs *types.FieldSpec) bool {
-	return fs.Path == "metadata/name"
-}
-
-func (p *PrefixSuffixTransformerPlugin) shouldSkip(
-	id resid.ResId) bool {
-	for _, path := range prefixSuffixFieldSpecsToSkip {
-		if id.IsSelected(&path.Gvk) {
-			return true
-		}
-	}
-	return false
-}
-
-func (p *PrefixSuffixTransformerPlugin) addPrefixSuffix(
-	in interface{}) (interface{}, error) {
-	s, ok := in.(string)
-	if !ok {
-		return nil, fmt.Errorf("%#v is expected to be %T", in, s)
-	}
-	return fmt.Sprintf("%s%s%s", p.Prefix, s, p.Suffix), nil
-}
-
-func NewPrefixSuffixTransformerPlugin() resmap.TransformerPlugin {
-	return &PrefixSuffixTransformerPlugin{}
-}

api/builtins/builtins.go

@@ -0,0 +1,49 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Deprecated: Package api/builtins will not be available in API v1.
+package builtins
+
+import (
+	internal "sigs.k8s.io/kustomize/api/internal/builtins"
+)
+
+type (
+	AnnotationsTransformerPlugin         = internal.AnnotationsTransformerPlugin
+	ConfigMapGeneratorPlugin             = internal.ConfigMapGeneratorPlugin
+	HashTransformerPlugin                = internal.HashTransformerPlugin
+	HelmChartInflationGeneratorPlugin    = internal.HelmChartInflationGeneratorPlugin
+	IAMPolicyGeneratorPlugin             = internal.IAMPolicyGeneratorPlugin
+	ImageTagTransformerPlugin            = internal.ImageTagTransformerPlugin
+	LabelTransformerPlugin               = internal.LabelTransformerPlugin
+	NamespaceTransformerPlugin           = internal.NamespaceTransformerPlugin
+	PatchJson6902TransformerPlugin       = internal.PatchJson6902TransformerPlugin
+	PatchStrategicMergeTransformerPlugin = internal.PatchStrategicMergeTransformerPlugin
+	PatchTransformerPlugin               = internal.PatchTransformerPlugin
+	PrefixTransformerPlugin              = internal.PrefixTransformerPlugin
+	SuffixTransformerPlugin              = internal.SuffixTransformerPlugin
+	ReplacementTransformerPlugin         = internal.ReplacementTransformerPlugin
+	ReplicaCountTransformerPlugin        = internal.ReplicaCountTransformerPlugin
+	SecretGeneratorPlugin                = internal.SecretGeneratorPlugin
+	ValueAddTransformerPlugin            = internal.ValueAddTransformerPlugin
+)
+
+var (
+	NewAnnotationsTransformerPlugin         = internal.NewAnnotationsTransformerPlugin
+	NewConfigMapGeneratorPlugin             = internal.NewConfigMapGeneratorPlugin
+	NewHashTransformerPlugin                = internal.NewHashTransformerPlugin
+	NewHelmChartInflationGeneratorPlugin    = internal.NewHelmChartInflationGeneratorPlugin
+	NewIAMPolicyGeneratorPlugin             = internal.NewIAMPolicyGeneratorPlugin
+	NewImageTagTransformerPlugin            = internal.NewImageTagTransformerPlugin
+	NewLabelTransformerPlugin               = internal.NewLabelTransformerPlugin
+	NewNamespaceTransformerPlugin           = internal.NewNamespaceTransformerPlugin
+	NewPatchJson6902TransformerPlugin       = internal.NewPatchJson6902TransformerPlugin
+	NewPatchStrategicMergeTransformerPlugin = internal.NewPatchStrategicMergeTransformerPlugin
+	NewPatchTransformerPlugin               = internal.NewPatchTransformerPlugin
+	NewPrefixTransformerPlugin              = internal.NewPrefixTransformerPlugin
+	NewSuffixTransformerPlugin              = internal.NewSuffixTransformerPlugin
+	NewReplacementTransformerPlugin         = internal.NewReplacementTransformerPlugin
+	NewReplicaCountTransformerPlugin        = internal.NewReplicaCountTransformerPlugin
+	NewSecretGeneratorPlugin                = internal.NewSecretGeneratorPlugin
+	NewValueAddTransformerPlugin            = internal.NewValueAddTransformerPlugin
+)

api/filesys/filesys.go

@@ -0,0 +1,61 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package filesys provides a file system abstraction,
+// a subset of that provided by golang.org/pkg/os,
+// with an on-disk and in-memory representation.
+//
+// Deprecated: use sigs.k8s.io/kustomize/kyaml/filesys instead.
+package filesys
+
+import "sigs.k8s.io/kustomize/kyaml/filesys"
+
+const (
+	// Separator is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.Separator.
+	Separator = filesys.Separator
+	// SelfDir is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.SelfDir.
+	SelfDir = filesys.SelfDir
+	// ParentDir is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.ParentDir.
+	ParentDir = filesys.ParentDir
+)
+
+type (
+	// FileSystem is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.FileSystem.
+	FileSystem = filesys.FileSystem
+	// FileSystemOrOnDisk is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.FileSystemOrOnDisk.
+	FileSystemOrOnDisk = filesys.FileSystemOrOnDisk
+	// ConfirmedDir is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.ConfirmedDir.
+	ConfirmedDir = filesys.ConfirmedDir
+)
+
+// MakeEmptyDirInMemory is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.MakeEmptyDirInMemory.
+func MakeEmptyDirInMemory() FileSystem { return filesys.MakeEmptyDirInMemory() }
+
+// MakeFsInMemory is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.MakeFsInMemory.
+func MakeFsInMemory() FileSystem { return filesys.MakeFsInMemory() }
+
+// MakeFsOnDisk is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.MakeFsOnDisk.
+func MakeFsOnDisk() FileSystem { return filesys.MakeFsOnDisk() }
+
+// NewTmpConfirmedDir is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.NewTmpConfirmedDir.
+func NewTmpConfirmedDir() (filesys.ConfirmedDir, error) { return filesys.NewTmpConfirmedDir() }
+
+// RootedPath is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.RootedPath.
+func RootedPath(elem ...string) string { return filesys.RootedPath(elem...) }
+
+// StripTrailingSeps is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.StripTrailingSeps.
+func StripTrailingSeps(s string) string { return filesys.StripTrailingSeps(s) }
+
+// StripLeadingSeps is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.StripLeadingSeps.
+func StripLeadingSeps(s string) string { return filesys.StripLeadingSeps(s) }
+
+// PathSplit is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.PathSplit.
+func PathSplit(incoming string) []string { return filesys.PathSplit(incoming) }
+
+// PathJoin is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.PathJoin.
+func PathJoin(incoming []string) string { return filesys.PathJoin(incoming) }
+
+// InsertPathPart is deprecated, use sigs.k8s.io/kustomize/kyaml/filesys.InsertPathPart.
+func InsertPathPart(path string, pos int, part string) string {
+	return filesys.InsertPathPart(path, pos, part)
+}

api/filesys/filesystem.go

@@ -1,50 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-// Package filesys provides a file system abstraction layer.
-package filesys
-
-import (
-	"path/filepath"
-)
-
-const (
-	Separator = string(filepath.Separator)
-	SelfDir   = "."
-	ParentDir = ".."
-)
-
-// FileSystem groups basic os filesystem methods.
-// It's supposed be functional subset of https://golang.org/pkg/os
-type FileSystem interface {
-	// Create a file.
-	Create(path string) (File, error)
-	// MkDir makes a directory.
-	Mkdir(path string) error
-	// MkDirAll makes a directory path, creating intervening directories.
-	MkdirAll(path string) error
-	// RemoveAll removes path and any children it contains.
-	RemoveAll(path string) error
-	// Open opens the named file for reading.
-	Open(path string) (File, error)
-	// IsDir returns true if the path is a directory.
-	IsDir(path string) bool
-	// CleanedAbs converts the given path into a
-	// directory and a file name, where the directory
-	// is represented as a ConfirmedDir and all that implies.
-	// If the entire path is a directory, the file component
-	// is an empty string.
-	CleanedAbs(path string) (ConfirmedDir, string, error)
-	// Exists is true if the path exists in the file system.
-	Exists(path string) bool
-	// Glob returns the list of matching files,
-	// emulating https://golang.org/pkg/path/filepath/#Glob
-	Glob(pattern string) ([]string, error)
-	// ReadFile returns the contents of the file at the given path.
-	ReadFile(path string) ([]byte, error)
-	// WriteFile writes the data to a file at the given path,
-	// overwriting anything that's already there.
-	WriteFile(path string, data []byte) error
-	// Walk walks the file system with the given WalkFunc.
-	Walk(path string, walkFn filepath.WalkFunc) error
-}

api/filesys/fsondisk_test.go

@@ -1,165 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-package filesys_test
-
-import (
-	"io/ioutil"
-	"os"
-	"path"
-	"path/filepath"
-	"reflect"
-	"testing"
-
-	. "sigs.k8s.io/kustomize/api/filesys"
-)
-
-func makeTestDir(t *testing.T) (FileSystem, string) {
-	fSys := MakeFsOnDisk()
-	td, err := ioutil.TempDir("", "kustomize_testing_dir")
-	if err != nil {
-		t.Fatalf("unexpected error %s", err)
-	}
-	testDir, err := filepath.EvalSymlinks(td)
-	if err != nil {
-		t.Fatalf("unexpected error %s", err)
-	}
-	if !fSys.Exists(testDir) {
-		t.Fatalf("expected existence")
-	}
-	if !fSys.IsDir(testDir) {
-		t.Fatalf("expected directory")
-	}
-	return fSys, testDir
-}
-
-func TestCleanedAbs_1(t *testing.T) {
-	fSys, testDir := makeTestDir(t)
-	defer os.RemoveAll(testDir)
-
-	d, f, err := fSys.CleanedAbs("")
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-	wd, err := os.Getwd()
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-	if d.String() != wd {
-		t.Fatalf("unexpected d=%s", d)
-	}
-	if f != "" {
-		t.Fatalf("unexpected f=%s", f)
-	}
-}
-
-func TestCleanedAbs_2(t *testing.T) {
-	fSys, testDir := makeTestDir(t)
-	defer os.RemoveAll(testDir)
-
-	d, f, err := fSys.CleanedAbs("/")
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-	if d != "/" {
-		t.Fatalf("unexpected d=%s", d)
-	}
-	if f != "" {
-		t.Fatalf("unexpected f=%s", f)
-	}
-}
-
-func TestCleanedAbs_3(t *testing.T) {
-	fSys, testDir := makeTestDir(t)
-	defer os.RemoveAll(testDir)
-
-	err := fSys.WriteFile(
-		filepath.Join(testDir, "foo"), []byte(`foo`))
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-
-	d, f, err := fSys.CleanedAbs(filepath.Join(testDir, "foo"))
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-	if d.String() != testDir {
-		t.Fatalf("unexpected d=%s", d)
-	}
-	if f != "foo" {
-		t.Fatalf("unexpected f=%s", f)
-	}
-}
-
-func TestCleanedAbs_4(t *testing.T) {
-	fSys, testDir := makeTestDir(t)
-	defer os.RemoveAll(testDir)
-
-	err := fSys.MkdirAll(filepath.Join(testDir, "d1", "d2"))
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-	err = fSys.WriteFile(
-		filepath.Join(testDir, "d1", "d2", "bar"),
-		[]byte(`bar`))
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-
-	d, f, err := fSys.CleanedAbs(
-		filepath.Join(testDir, "d1", "d2"))
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-	if d.String() != filepath.Join(testDir, "d1", "d2") {
-		t.Fatalf("unexpected d=%s", d)
-	}
-	if f != "" {
-		t.Fatalf("unexpected f=%s", f)
-	}
-
-	d, f, err = fSys.CleanedAbs(
-		filepath.Join(testDir, "d1", "d2", "bar"))
-	if err != nil {
-		t.Fatalf("unexpected err=%v", err)
-	}
-	if d.String() != filepath.Join(testDir, "d1", "d2") {
-		t.Fatalf("unexpected d=%s", d)
-	}
-	if f != "bar" {
-		t.Fatalf("unexpected f=%s", f)
-	}
-}
-
-func TestReadFilesRealFS(t *testing.T) {
-	fSys, testDir := makeTestDir(t)
-	defer os.RemoveAll(testDir)
-
-	err := fSys.WriteFile(path.Join(testDir, "foo"), []byte(`foo`))
-	if err != nil {
-		t.Fatalf("unexpected error %s", err)
-	}
-	if !fSys.Exists(path.Join(testDir, "foo")) {
-		t.Fatalf("expected foo")
-	}
-	if fSys.IsDir(path.Join(testDir, "foo")) {
-		t.Fatalf("expected foo not to be a directory")
-	}
-
-	err = fSys.WriteFile(path.Join(testDir, "bar"), []byte(`bar`))
-	if err != nil {
-		t.Fatalf("unexpected error %s", err)
-	}
-
-	files, err := fSys.Glob(path.Join("testDir", "*"))
-	expected := []string{
-		path.Join(testDir, "bar"),
-		path.Join(testDir, "foo"),
-	}
-	if err != nil {
-		t.Fatalf("expected no error")
-	}
-	if reflect.DeepEqual(files, expected) {
-		t.Fatalf("incorrect files found by glob: %v", files)
-	}
-}

api/filters/annotations/annotations.go

@@ -19,19 +19,29 @@ type Filter struct {
 
 	// FsSlice contains the FieldSpecs to locate the namespace field
 	FsSlice types.FsSlice
+
+	trackableSetter filtersutil.TrackableSetter
 }
 
 var _ kio.Filter = Filter{}
+var _ kio.TrackableFilter = &Filter{}
+
+// WithMutationTracker registers a callback which will be invoked each time a field is mutated
+func (f *Filter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) {
+	f.trackableSetter.WithMutationTracker(callback)
+}
 
 func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
-	keys := filtersutil.SortedMapKeys(f.Annotations)
+	keys := yaml.SortedMapKeys(f.Annotations)
 	_, err := kio.FilterAll(yaml.FilterFunc(
 		func(node *yaml.RNode) (*yaml.RNode, error) {
 			for _, k := range keys {
 				if err := node.PipeE(fsslice.Filter{
-					FsSlice:    f.FsSlice,
-					SetValue:   fsslice.SetEntry(k, f.Annotations[k]),
+					FsSlice: f.FsSlice,
+					SetValue: f.trackableSetter.SetEntry(
+						k, f.Annotations[k], yaml.NodeTagString),
 					CreateKind: yaml.MappingNode, // Annotations are MappingNodes.
+					CreateTag:  yaml.NodeTagMap,
 				}); err != nil {
 					return nil, err
 				}

api/filters/annotations/annotations_test.go

@@ -11,16 +11,20 @@ import (
 	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
 	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 var annosFs = builtinconfig.MakeDefaultConfig().CommonAnnotations
 
 func TestAnnotations_Filter(t *testing.T) {
+	mutationTrackStub := filtertest_test.MutationTrackerStub{}
 	testCases := map[string]struct {
-		input          string
-		expectedOutput string
-		filter         Filter
-		fsslice        types.FsSlice
+		input                string
+		expectedOutput       string
+		filter               Filter
+		fsslice              types.FsSlice
+		setEntryCallback     func(key, value, tag string, node *yaml.RNode)
+		expectedSetEntryArgs []filtertest_test.SetValueArg
 	}{
 		"add": {
 			input: `
@@ -123,17 +127,173 @@ a:
 				},
 			},
 		},
+
+		"number": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  annotations:
+    hero: batman
+    fiend: riddler
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  annotations:
+    hero: batman
+    fiend: riddler
+    2: ford
+    clown: "1"
+`,
+			filter: Filter{Annotations: annoMap{
+				"clown": "1",
+				"2":     "ford",
+			}},
+		},
+
+		// test quoting of values which are not considered strings in yaml 1.1
+		"yaml_1_1_compatibility": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  annotations:
+    hero: batman
+    fiend: riddler
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  annotations:
+    hero: batman
+    fiend: riddler
+    a: "y"
+    b: y1
+    c: "yes"
+    d: yes1
+    e: "true"
+    f: true1
+`,
+			filter: Filter{Annotations: annoMap{
+				"a": "y",
+				"b": "y1",
+				"c": "yes",
+				"d": "yes1",
+				"e": "true",
+				"f": "true1",
+			}},
+		},
+
+		// test quoting of values which are not considered strings in yaml 1.1
+		"null_annotations": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  annotations: null
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  annotations:
+    a: a1
+    b: b1
+`,
+			filter: Filter{Annotations: annoMap{
+				"a": "a1",
+				"b": "b1",
+			}},
+		},
+
+		// test usage of SetEntryCallback
+		"set_entry_callback": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  annotations:
+    a: a1
+    b: b1
+spec:
+  template:
+    metadata:
+      annotations:
+        a: a1
+        b: b1
+`,
+			filter: Filter{
+				Annotations: annoMap{
+					"a": "a1",
+					"b": "b1",
+				},
+			},
+			setEntryCallback: mutationTrackStub.MutationTracker,
+			fsslice: []types.FieldSpec{
+				{
+					Path:               "spec/template/metadata/annotations",
+					CreateIfNotPresent: true,
+				},
+			},
+			expectedSetEntryArgs: []filtertest_test.SetValueArg{
+				{
+					Key:      "a",
+					Value:    "a1",
+					Tag:      "!!str",
+					NodePath: []string{"metadata", "annotations"},
+				},
+				{
+					Key:      "a",
+					Value:    "a1",
+					Tag:      "!!str",
+					NodePath: []string{"spec", "template", "metadata", "annotations"},
+				},
+				{
+					Key:      "b",
+					Value:    "b1",
+					Tag:      "!!str",
+					NodePath: []string{"metadata", "annotations"},
+				},
+				{
+					Key:      "b",
+					Value:    "b1",
+					Tag:      "!!str",
+					NodePath: []string{"spec", "template", "metadata", "annotations"},
+				},
+			},
+		},
 	}
 
 	for tn, tc := range testCases {
+		mutationTrackStub.Reset()
 		t.Run(tn, func(t *testing.T) {
 			filter := tc.filter
-			filter.FsSlice = append(annosFs, tc.fsslice...)
+			filter.WithMutationTracker(tc.setEntryCallback)
+			filter.FsSlice = append(annosFs, tc.fsslice...) //nolint:gocritic
 			if !assert.Equal(t,
 				strings.TrimSpace(tc.expectedOutput),
 				strings.TrimSpace(filtertest_test.RunFilter(t, tc.input, filter))) {
 				t.FailNow()
 			}
+			if !assert.Equal(t, tc.expectedSetEntryArgs, mutationTrackStub.SetValueArgs()) {
+				t.FailNow()
+			}
 		})
 	}
 }

api/filters/annotations/example_test.go

@@ -28,7 +28,9 @@ metadata:
 `)}},
 		Filters: []kio.Filter{Filter{
 			Annotations: map[string]string{
-				"foo": "bar",
+				"foo":          "bar",
+				"booleanValue": "true",
+				"numberValue":  "42",
 			},
 			FsSlice: fss,
 		}},
@@ -44,12 +46,16 @@ metadata:
 	// metadata:
 	//   name: instance
 	//   annotations:
+	//     booleanValue: "true"
 	//     foo: bar
+	//     numberValue: "42"
 	// ---
 	// apiVersion: example.com/v1
 	// kind: Bar
 	// metadata:
 	//   name: instance
 	//   annotations:
+	//     booleanValue: "true"
 	//     foo: bar
+	//     numberValue: "42"
 }

api/filters/doc.go

@@ -0,0 +1,8 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package filters
+
+// Package filters collects various implementations
+// sigs.k8s.io/kustomize/kyaml/kio.Filter used by kustomize
+// transformers to modify kubernetes objects.

api/filters/fieldspec/doc.go

@@ -0,0 +1,6 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package fieldspec contains a yaml.Filter to modify a resource
+// that matches the FieldSpec.
+package fieldspec

api/filters/fieldspec/example_test.go

@@ -0,0 +1,61 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package fieldspec_test
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	. "sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+func ExampleFilter() {
+	in := &kio.ByteReader{
+		Reader: bytes.NewBufferString(`
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+`),
+	}
+	fltr := Filter{
+		CreateKind: yaml.ScalarNode,
+		SetValue:   filtersutil.SetScalar("green"),
+		FieldSpec:  types.FieldSpec{Path: "a/b", CreateIfNotPresent: true},
+	}
+
+	err := kio.Pipeline{
+		Inputs:  []kio.Reader{in},
+		Filters: []kio.Filter{kio.FilterAll(fltr)},
+		Outputs: []kio.Writer{kio.ByteWriter{Writer: os.Stdout}},
+	}.Execute()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Output:
+	// apiVersion: example.com/v1
+	// kind: Foo
+	// metadata:
+	//   name: instance
+	// a:
+	//   b: green
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance
+	// a:
+	//   b: green
+}

api/filters/fieldspec/fieldspec.go

@@ -0,0 +1,182 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package fieldspec
+
+import (
+	"fmt"
+	"strings"
+
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/errors"
+	"sigs.k8s.io/kustomize/kyaml/resid"
+	"sigs.k8s.io/kustomize/kyaml/utils"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+var _ yaml.Filter = Filter{}
+
+// Filter possibly mutates its object argument using a FieldSpec.
+// If the object matches the FieldSpec, and the node found
+// by following the fieldSpec's path is non-null, this filter calls
+// the setValue function on the node at the end of the path.
+// If any part of the path doesn't exist, the filter returns
+// without doing anything and without error, unless it was set
+// to create the path. If set to create, it creates a tree of maps
+// along the path, and the leaf node gets the setValue called on it.
+// Error on GVK mismatch, empty or poorly formed path.
+// Filter expect kustomize style paths, not JSON paths.
+// Filter stores internal state and should not be reused
+type Filter struct {
+	// FieldSpec contains the path to the value to set.
+	FieldSpec types.FieldSpec `yaml:"fieldSpec"`
+
+	// Set the field using this function
+	SetValue filtersutil.SetFn
+
+	// CreateKind defines the type of node to create if the field is not found
+	CreateKind yaml.Kind
+
+	CreateTag string
+
+	// path keeps internal state about the current path
+	path []string
+}
+
+func (fltr Filter) Filter(obj *yaml.RNode) (*yaml.RNode, error) {
+	// check if the FieldSpec applies to the object
+	if match := isMatchGVK(fltr.FieldSpec, obj); !match {
+		return obj, nil
+	}
+	fltr.path = utils.PathSplitter(fltr.FieldSpec.Path, "/")
+	if err := fltr.filter(obj); err != nil {
+		return nil, errors.WrapPrefixf(err,
+			"considering field '%s' of object %s", fltr.FieldSpec.Path, resid.FromRNode(obj))
+	}
+	return obj, nil
+}
+
+// Recursively called.
+func (fltr Filter) filter(obj *yaml.RNode) error {
+	if len(fltr.path) == 0 {
+		// found the field -- set its value
+		return fltr.SetValue(obj)
+	}
+	if obj.IsTaggedNull() || obj.IsNil() {
+		return nil
+	}
+	switch obj.YNode().Kind {
+	case yaml.SequenceNode:
+		return fltr.handleSequence(obj)
+	case yaml.MappingNode:
+		return fltr.handleMap(obj)
+	case yaml.AliasNode:
+		return fltr.filter(yaml.NewRNode(obj.YNode().Alias))
+	default:
+		return errors.Errorf("expected sequence or mapping node")
+	}
+}
+
+// handleMap calls filter on the map field matching the next path element
+func (fltr Filter) handleMap(obj *yaml.RNode) error {
+	fieldName, isSeq := isSequenceField(fltr.path[0])
+	if fieldName == "" {
+		return fmt.Errorf("cannot set or create an empty field name")
+	}
+	// lookup the field matching the next path element
+	var operation yaml.Filter
+	var kind yaml.Kind
+	tag := yaml.NodeTagEmpty
+	switch {
+	case !fltr.FieldSpec.CreateIfNotPresent || fltr.CreateKind == 0 || isSeq:
+		// don't create the field if we don't find it
+		operation = yaml.Lookup(fieldName)
+		if isSeq {
+			// The query path thinks this field should be a sequence;
+			// accept this hint for use later if the tag is NodeTagNull.
+			kind = yaml.SequenceNode
+		}
+	case len(fltr.path) <= 1:
+		// create the field if it is missing: use the provided node kind
+		operation = yaml.LookupCreate(fltr.CreateKind, fieldName)
+		kind = fltr.CreateKind
+		tag = fltr.CreateTag
+	default:
+		// create the field if it is missing: must be a mapping node
+		operation = yaml.LookupCreate(yaml.MappingNode, fieldName)
+		kind = yaml.MappingNode
+		tag = yaml.NodeTagMap
+	}
+
+	// locate (or maybe create) the field
+	field, err := obj.Pipe(operation)
+	if err != nil {
+		return errors.WrapPrefixf(err, "fieldName: %s", fieldName)
+	}
+	if field == nil {
+		// No error if field not found.
+		return nil
+	}
+
+	// if the value exists, but is null and kind is set,
+	// then change it to the creation type
+	// TODO: update yaml.LookupCreate to support this
+	if field.YNode().Tag == yaml.NodeTagNull && yaml.IsCreate(kind) {
+		field.YNode().Kind = kind
+		field.YNode().Tag = tag
+	}
+
+	// copy the current fltr and change the path on the copy
+	var next = fltr
+	// call filter for the next path element on the matching field
+	next.path = fltr.path[1:]
+	return next.filter(field)
+}
+
+// seq calls filter on all sequence elements
+func (fltr Filter) handleSequence(obj *yaml.RNode) error {
+	if err := obj.VisitElements(func(node *yaml.RNode) error {
+		// set an accurate FieldPath for nested elements
+		node.AppendToFieldPath(obj.FieldPath()...)
+		// recurse on each element -- re-allocating a Filter is
+		// not strictly required, but is more consistent with field
+		// and less likely to have side effects
+		// keep the entire path -- it does not contain parts for sequences
+		return fltr.filter(node)
+	}); err != nil {
+		return errors.WrapPrefixf(err,
+			"visit traversal on path: %v", fltr.path)
+	}
+	return nil
+}
+
+// isSequenceField returns true if the path element is for a sequence field.
+// isSequence also returns the path element with the '[]' suffix trimmed
+func isSequenceField(name string) (string, bool) {
+	shorter := strings.TrimSuffix(name, "[]")
+	return shorter, shorter != name
+}
+
+// isMatchGVK returns true if the fs.GVK matches the obj GVK.
+func isMatchGVK(fs types.FieldSpec, obj *yaml.RNode) bool {
+	if kind := obj.GetKind(); fs.Kind != "" && fs.Kind != kind {
+		// kind doesn't match
+		return false
+	}
+
+	// parse the group and version from the apiVersion field
+	group, version := resid.ParseGroupVersion(obj.GetApiVersion())
+
+	if fs.Group != "" && fs.Group != group {
+		// group doesn't match
+		return false
+	}
+
+	if fs.Version != "" && fs.Version != version {
+		// version doesn't match
+		return false
+	}
+
+	return true
+}

api/filters/fieldspec/fieldspec_test.go

@@ -0,0 +1,643 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package fieldspec_test
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+func TestFilter_Filter(t *testing.T) {
+	testCases := map[string]struct {
+		input     string
+		expected  string
+		filter    fieldspec.Filter
+		fieldSpec string
+		error     string
+	}{
+		"path not found": {
+			fieldSpec: `
+path: a/b
+group: foo
+kind: Bar
+`,
+			input: `
+apiVersion: foo
+kind: Bar
+xxx:
+`,
+			expected: `
+apiVersion: foo
+kind: Bar
+xxx:
+`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+		"empty path": {
+			fieldSpec: `
+group: foo
+version: v1
+kind: Bar
+`,
+			input: `
+apiVersion: foo/v1
+kind: Bar
+xxx:
+`,
+			expected: `
+apiVersion: foo
+kind: Bar
+xxx:
+`,
+			error: `considering field '' of object Bar.v1.foo/[noName].[noNs]: cannot set or create an empty field name`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		"update": {
+			fieldSpec: `
+path: a/b
+group: foo
+kind: Bar
+`,
+			input: `
+apiVersion: foo/v1beta1
+kind: Bar
+a:
+  b: c
+`,
+			expected: `
+apiVersion: foo/v1beta1
+kind: Bar
+a:
+  b: e
+`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		"update-kind-not-match": {
+			fieldSpec: `
+path: a/b
+group: foo
+kind: Bar1
+`,
+			input: `
+apiVersion: foo/v1beta1
+kind: Bar2
+a:
+  b: c
+`,
+			expected: `
+apiVersion: foo/v1beta1
+kind: Bar2
+a:
+  b: c
+`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		"update-group-not-match": {
+			fieldSpec: `
+path: a/b
+group: foo1
+kind: Bar
+`,
+			input: `
+apiVersion: foo2/v1beta1
+kind: Bar
+a:
+  b: c
+`,
+			expected: `
+apiVersion: foo2/v1beta1
+kind: Bar
+a:
+  b: c
+`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		"update-version-not-match": {
+			fieldSpec: `
+path: a/b
+group: foo
+version: v1beta1
+kind: Bar
+`,
+			input: `
+apiVersion: foo/v1beta2
+kind: Bar
+a:
+  b: c
+`,
+			expected: `
+apiVersion: foo/v1beta2
+kind: Bar
+a:
+  b: c
+`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		"bad-version": {
+			fieldSpec: `
+path: a/b
+group: foo
+version: v1beta1
+kind: Bar
+`,
+			input: `
+apiVersion: foo/v1beta2/something
+kind: Bar
+a:
+  b: c
+`,
+			expected: `
+apiVersion: foo/v1beta2/something
+kind: Bar
+a:
+  b: c
+`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		"bad-meta": {
+			fieldSpec: `
+path: a/b
+group: foo
+version: v1beta1
+kind: Bar
+`,
+			input: `
+a:
+  b: c
+`,
+			expected: `
+a:
+  b: c
+`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		"miss-match-type": {
+			fieldSpec: `
+path: a/b/c
+kind: Bar
+`,
+			input: `
+kind: Bar
+a:
+  b: a
+`,
+			error: `considering field 'a/b/c' of object Bar.[noVer].[noGrp]/[noName].[noNs]: expected sequence or mapping node`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		"add": {
+			fieldSpec: `
+path: a/b/c/d
+group: foo
+create: true
+kind: Bar
+`,
+			input: `
+apiVersion: foo/v1beta1
+kind: Bar
+a: {}
+`,
+			expected: `
+apiVersion: foo/v1beta1
+kind: Bar
+a: {b: {c: {d: e}}}
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("e"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+
+		"update-in-sequence": {
+			fieldSpec: `
+path: a/b[]/c/d
+group: foo
+kind: Bar
+`,
+			input: `
+apiVersion: foo/v1beta1
+kind: Bar
+a:
+  b:
+  - c:
+      d: a
+`,
+			expected: `
+apiVersion: foo/v1beta1
+kind: Bar
+a:
+  b:
+  - c:
+      d: e
+`,
+			filter: fieldspec.Filter{
+				SetValue: filtersutil.SetScalar("e"),
+			},
+		},
+
+		// Don't create a sequence
+		"empty-sequence-no-create": {
+			fieldSpec: `
+path: a/b[]/c/d
+group: foo
+create: true
+kind: Bar
+`,
+			input: `
+apiVersion: foo/v1beta1
+kind: Bar
+a: {}
+`,
+			expected: `
+apiVersion: foo/v1beta1
+kind: Bar
+a: {}
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("e"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+
+		// Create a new field for an element in a sequence
+		"empty-sequence-create": {
+			fieldSpec: `
+path: a/b[]/c/d
+group: foo
+create: true
+kind: Bar
+`,
+			input: `
+apiVersion: foo/v1beta1
+kind: Bar
+a:
+  b:
+  - c: {}
+`,
+			expected: `
+apiVersion: foo/v1beta1
+kind: Bar
+a:
+  b:
+  - c: {d: e}
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("e"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+
+		"group v1": {
+			fieldSpec: `
+path: a/b
+group: v1
+create: true
+kind: Bar
+`,
+			input: `
+apiVersion: v1
+kind: Bar
+`,
+			expected: `
+apiVersion: v1
+kind: Bar
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("e"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+
+		"version v1": {
+			fieldSpec: `
+path: a/b
+version: v1
+create: true
+kind: Bar
+`,
+			input: `
+apiVersion: v1
+kind: Bar
+`,
+			expected: `
+apiVersion: v1
+kind: Bar
+a:
+  b: e
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("e"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+
+		"successfully set field on array entry no sequence hint": {
+			fieldSpec: `
+path: spec/containers/image
+version: v1
+kind: Bar
+`,
+			input: `
+apiVersion: v1
+kind: Bar
+spec:
+  containers:
+  - image: foo
+`,
+			expected: `
+apiVersion: v1
+kind: Bar
+spec:
+  containers:
+  - image: bar
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("bar"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+
+		"successfully set field on array entry with sequence hint": {
+			fieldSpec: `
+path: spec/containers[]/image
+version: v1
+kind: Bar
+`,
+			input: `
+apiVersion: v1
+kind: Bar
+spec:
+  containers:
+  - image: foo
+`,
+			expected: `
+apiVersion: v1
+kind: Bar
+spec:
+  containers:
+  - image: bar
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("bar"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+		"failure to set field on array entry with sequence hint in path": {
+			fieldSpec: `
+path: spec/containers[]/image
+version: v1
+kind: Bar
+`,
+			input: `
+apiVersion: v1
+kind: Bar
+spec:
+  containers:
+`,
+			expected: `
+apiVersion: v1
+kind: Bar
+spec:
+  containers: []
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("bar"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+
+		"failure to set field on array entry, no sequence hint in path": {
+			fieldSpec: `
+path: spec/containers/image
+version: v1
+kind: Bar
+`,
+			input: `
+apiVersion: v1
+kind: Bar
+spec:
+  containers:
+`,
+			expected: `
+apiVersion: v1
+kind: Bar
+spec:
+  containers:
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("bar"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+		"fieldname with slash '/'": {
+			fieldSpec: `
+path: a/b\/c/d
+version: v1
+kind: Bar
+`,
+			input: `
+apiVersion: v1
+kind: Bar
+a:
+  b/c:
+    d: foo
+`,
+			expected: `
+apiVersion: v1
+kind: Bar
+a:
+  b/c:
+    d: bar
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("bar"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+		"fieldname with multiple '/'": {
+			fieldSpec: `
+path: a/b\/c/d\/e/f
+version: v1
+kind: Bar
+`,
+			input: `
+apiVersion: v1
+kind: Bar
+a:
+  b/c:
+    d/e:
+      f: foo
+`,
+			expected: `
+apiVersion: v1
+kind: Bar
+a:
+  b/c:
+    d/e:
+      f: bar
+`,
+			filter: fieldspec.Filter{
+				SetValue:   filtersutil.SetScalar("bar"),
+				CreateKind: yaml.ScalarNode,
+			},
+		},
+	}
+
+	for n := range testCases {
+		tc := testCases[n]
+		t.Run(n, func(t *testing.T) {
+			err := yaml.Unmarshal([]byte(tc.fieldSpec), &tc.filter.FieldSpec)
+			if !assert.NoError(t, err) {
+				t.FailNow()
+			}
+
+			out := &bytes.Buffer{}
+			rw := &kio.ByteReadWriter{
+				Reader:                bytes.NewBufferString(tc.input),
+				Writer:                out,
+				OmitReaderAnnotations: true,
+			}
+
+			// run the filter
+			err = kio.Pipeline{
+				Inputs:  []kio.Reader{rw},
+				Filters: []kio.Filter{kio.FilterAll(tc.filter)},
+				Outputs: []kio.Writer{rw},
+			}.Execute()
+			if tc.error != "" {
+				if !assert.EqualError(t, err, tc.error) {
+					t.FailNow()
+				}
+				// stop rest of test
+				return
+			}
+
+			if !assert.NoError(t, err) {
+				t.FailNow()
+			}
+
+			// check results
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expected),
+				strings.TrimSpace(out.String())) {
+				t.FailNow()
+			}
+		})
+	}
+}
+
+func TestFilter_FieldPaths(t *testing.T) {
+	testCases := map[string]struct {
+		input     string
+		fieldSpec string
+		expected  []string
+	}{
+		"fieldpath containing SequenceNode": {
+			input: `
+apiVersion: v1
+kind: Pod
+metadata:
+  name: app
+spec:
+  containers:
+  - name: store
+    image: redis:6.2.6
+  - name: server
+    image: nginx:latest
+`,
+			fieldSpec: `
+path: spec/containers[]/image
+kind: Pod
+`,
+			expected: []string{
+				"spec.containers.image",
+				"spec.containers.image",
+			},
+		},
+		"fieldpath with MappingNode": {
+			input: `
+apiVersion: v1
+kind: Pod
+metadata:
+  name: app
+spec:
+  containers:
+  - name: store
+    image: redis:6.2.6
+  - name: server
+    image: nginx:latest
+`,
+			fieldSpec: `
+path: metadata/name
+kind: Pod
+`,
+			expected: []string{
+				"metadata.name",
+			},
+		},
+	}
+	for name, tc := range testCases {
+		var fieldPaths []string
+		trackableSetter := filtersutil.TrackableSetter{}
+		trackableSetter.WithMutationTracker(func(key, value, tag string, node *yaml.RNode) {
+			fieldPaths = append(fieldPaths, strings.Join(node.FieldPath(), "."))
+		})
+		filter := fieldspec.Filter{
+			SetValue: trackableSetter.SetScalar("foo"),
+		}
+
+		t.Run(name, func(t *testing.T) {
+			err := yaml.Unmarshal([]byte(tc.fieldSpec), &filter.FieldSpec)
+			require.NoError(t, err)
+			rw := &kio.ByteReadWriter{
+				Reader:                bytes.NewBufferString(tc.input),
+				Writer:                &bytes.Buffer{},
+				OmitReaderAnnotations: true,
+			}
+
+			// run the filter
+			err = kio.Pipeline{
+				Inputs:  []kio.Reader{rw},
+				Filters: []kio.Filter{kio.FilterAll(filter)},
+				Outputs: []kio.Writer{rw},
+			}.Execute()
+
+			require.NoError(t, err)
+			assert.Equal(t, tc.expected, fieldPaths)
+		})
+	}
+}

api/filters/filtersutil/filtersutil.go

@@ -1,21 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-package filtersutil
-
-import (
-	"sort"
-)
-
-// SortedMapKeys returns a sorted slice of keys to the given map.
-// Writing this function never gets old.
-func SortedMapKeys(m map[string]string) []string {
-	keys := make([]string, len(m))
-	i := 0
-	for k := range m {
-		keys[i] = k
-		i++
-	}
-	sort.Strings(keys)
-	return keys
-}

api/filters/filtersutil/setters.go

@@ -0,0 +1,105 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package filtersutil
+
+import (
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// SetFn is a function that accepts an RNode to possibly modify.
+type SetFn func(*yaml.RNode) error
+
+// SetScalar returns a SetFn to set a scalar value
+func SetScalar(value string) SetFn {
+	return SetEntry("", value, yaml.NodeTagEmpty)
+}
+
+// SetEntry returns a SetFn to set a field or a map entry to a value.
+// It can be used with an empty name to set both a value and a tag on a scalar node.
+// When setting only a value on a scalar node, use SetScalar instead.
+func SetEntry(name, value, tag string) SetFn {
+	n := &yaml.Node{
+		Kind:  yaml.ScalarNode,
+		Value: value,
+		Tag:   tag,
+	}
+	return func(node *yaml.RNode) error {
+		return node.PipeE(yaml.FieldSetter{
+			Name:  name,
+			Value: yaml.NewRNode(n),
+		})
+	}
+}
+
+type TrackableSetter struct {
+	// SetValueCallback will be invoked each time a field is set
+	setValueCallback func(name, value, tag string, node *yaml.RNode)
+}
+
+// WithMutationTracker registers a callback which will be invoked each time a field is mutated
+func (s *TrackableSetter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) *TrackableSetter {
+	s.setValueCallback = callback
+	return s
+}
+
+// SetScalar returns a SetFn to set a scalar value.
+// if a mutation tracker has been registered, the tracker will be invoked each
+// time a scalar is set
+func (s TrackableSetter) SetScalar(value string) SetFn {
+	return s.SetEntry("", value, yaml.NodeTagEmpty)
+}
+
+// SetScalarIfEmpty returns a SetFn to set a scalar value only if it isn't already set.
+// If a mutation tracker has been registered, the tracker will be invoked each
+// time a scalar is actually set.
+func (s TrackableSetter) SetScalarIfEmpty(value string) SetFn {
+	return s.SetEntryIfEmpty("", value, yaml.NodeTagEmpty)
+}
+
+// SetEntry returns a SetFn to set a field or a map entry to a value.
+// It can be used with an empty name to set both a value and a tag on a scalar node.
+// When setting only a value on a scalar node, use SetScalar instead.
+// If a mutation tracker has been registered, the tracker will be invoked each
+// time an entry is set.
+func (s TrackableSetter) SetEntry(name, value, tag string) SetFn {
+	origSetEntry := SetEntry(name, value, tag)
+	return func(node *yaml.RNode) error {
+		if s.setValueCallback != nil {
+			s.setValueCallback(name, value, tag, node)
+		}
+		return origSetEntry(node)
+	}
+}
+
+// SetEntryIfEmpty returns a SetFn to set a field or a map entry to a value only if it isn't already set.
+// It can be used with an empty name to set both a value and a tag on a scalar node.
+// When setting only a value on a scalar node, use SetScalar instead.
+// If a mutation tracker has been registered, the tracker will be invoked each
+// time an entry is actually set.
+func (s TrackableSetter) SetEntryIfEmpty(key, value, tag string) SetFn {
+	origSetEntry := SetEntry(key, value, tag)
+	return func(node *yaml.RNode) error {
+		if hasExistingValue(node, key) {
+			return nil
+		}
+		if s.setValueCallback != nil {
+			s.setValueCallback(key, value, tag, node)
+		}
+		return origSetEntry(node)
+	}
+}
+
+func hasExistingValue(node *yaml.RNode, key string) bool {
+	if node.IsNilOrEmpty() {
+		return false
+	}
+	if err := yaml.ErrorIfInvalid(node, yaml.ScalarNode); err == nil {
+		return yaml.GetValue(node) != ""
+	}
+	entry := node.Field(key)
+	if entry.IsNilOrEmpty() {
+		return false
+	}
+	return yaml.GetValue(entry.Value) != ""
+}

api/filters/filtersutil/setters_test.go

@@ -0,0 +1,108 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package filtersutil_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+func TestTrackableSetter_SetScalarIfEmpty(t *testing.T) {
+	tests := []struct {
+		name  string
+		input *yaml.RNode
+		value string
+		want  string
+	}{
+		{
+			name:  "sets null values",
+			input: yaml.MakeNullNode(),
+			value: "foo",
+			want:  "foo",
+		},
+		{
+			name:  "sets empty values",
+			input: yaml.NewScalarRNode(""),
+			value: "foo",
+			want:  "foo",
+		},
+		{
+			name:  "does not overwrite values",
+			input: yaml.NewStringRNode("a"),
+			value: "foo",
+			want:  "a",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			wasSet := false
+			s := (&filtersutil.TrackableSetter{}).WithMutationTracker(func(_, _, _ string, _ *yaml.RNode) {
+				wasSet = true
+			})
+			wantSet := tt.value == tt.want
+			fn := s.SetScalarIfEmpty(tt.value)
+			require.NoError(t, fn(tt.input))
+			assert.Equal(t, tt.want, yaml.GetValue(tt.input))
+			assert.Equal(t, wantSet, wasSet, "tracker invoked even though value was not changed")
+		})
+	}
+}
+
+func TestTrackableSetter_SetEntryIfEmpty(t *testing.T) {
+	tests := []struct {
+		name  string
+		input *yaml.RNode
+		key   string
+		value string
+		want  string
+	}{
+		{
+			name:  "sets empty values",
+			input: yaml.NewMapRNode(&map[string]string{"setMe": ""}),
+			key:   "setMe",
+			value: "foo",
+			want:  "foo",
+		},
+		{
+			name:  "sets missing keys",
+			input: yaml.NewMapRNode(&map[string]string{}),
+			key:   "setMe",
+			value: "foo",
+			want:  "foo",
+		},
+		{
+			name:  "does not overwrite values",
+			input: yaml.NewMapRNode(&map[string]string{"existing": "original"}),
+			key:   "existing",
+			value: "foo",
+			want:  "original",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			wasSet := false
+			s := (&filtersutil.TrackableSetter{}).WithMutationTracker(func(_, _, _ string, _ *yaml.RNode) {
+				wasSet = true
+			})
+			wantSet := tt.value == tt.want
+			fn := s.SetEntryIfEmpty(tt.key, tt.value, "")
+			require.NoError(t, fn(tt.input))
+			assert.Equal(t, tt.want, yaml.GetValue(tt.input.Field(tt.key).Value))
+			assert.Equal(t, wantSet, wasSet, "tracker invoked even though value was not changed")
+		})
+	}
+}
+
+func TestTrackableSetter_SetEntryIfEmpty_BadInputNodeKind(t *testing.T) {
+	fn := filtersutil.TrackableSetter{}.SetEntryIfEmpty("foo", "false", yaml.NodeTagBool)
+	rn := yaml.NewListRNode("nope")
+	rn.AppendToFieldPath("dummy", "path")
+	assert.EqualError(t, fn(rn), `wrong node kind: expected MappingNode but got SequenceNode: node contents:
+- nope
+`)
+}

api/filters/fsslice/doc.go

@@ -1,6 +1,6 @@
 // Copyright 2020 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-// Package fsslice contains a yaml.Filter to modify a resource using an
-// FsSlice to identify fields to be updated within the resource.
+// Package fsslice contains a yaml.Filter to modify a resource if
+// it matches one or more FieldSpec entries.
 package fsslice

api/filters/fsslice/example_test.go

@@ -8,6 +8,7 @@ import (
 	"log"
 	"os"
 
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
 	"sigs.k8s.io/kustomize/api/filters/fsslice"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/kio"
@@ -30,7 +31,7 @@ metadata:
 	}
 	fltr := fsslice.Filter{
 		CreateKind: yaml.ScalarNode,
-		SetValue:   fsslice.SetScalar("green"),
+		SetValue:   filtersutil.SetScalar("green"),
 		FsSlice: []types.FieldSpec{
 			{Path: "a/b", CreateIfNotPresent: true},
 		},

api/filters/fsslice/fieldspec_filter.go

@@ -1,140 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-package fsslice
-
-import (
-	"strings"
-
-	"sigs.k8s.io/kustomize/api/types"
-	"sigs.k8s.io/kustomize/kyaml/errors"
-	"sigs.k8s.io/kustomize/kyaml/yaml"
-)
-
-// fieldSpecFilter applies a single fieldSpec to a single object
-// fieldSpecFilter stores internal state and should not be reused
-type fieldSpecFilter struct {
-	// FieldSpec contains the path to the value to set.
-	FieldSpec types.FieldSpec `yaml:"fieldSpec"`
-
-	// Set the field using this function
-	SetValue SetFn
-
-	// CreateKind defines the type of node to create if the field is not found
-	CreateKind yaml.Kind
-
-	// path keeps internal state about the current path
-	path []string
-}
-
-func (fltr fieldSpecFilter) Filter(obj *yaml.RNode) (*yaml.RNode, error) {
-	// check if the FieldSpec applies to the object
-	if match, err := isMatchGVK(fltr.FieldSpec, obj); !match || err != nil {
-		return obj, errors.Wrap(err)
-	}
-	fltr.path = strings.Split(fltr.FieldSpec.Path, "/")
-	if err := fltr.filter(obj); err != nil {
-		s, _ := obj.String()
-		return nil, errors.WrapPrefixf(err,
-			"obj %v at path %v", s, fltr.FieldSpec.Path)
-	}
-	return obj, nil
-}
-
-func (fltr fieldSpecFilter) filter(obj *yaml.RNode) error {
-	if len(fltr.path) == 0 {
-		// found the field -- set its value
-		return fltr.SetValue(obj)
-	}
-	switch obj.YNode().Kind {
-	case yaml.SequenceNode:
-		return fltr.seq(obj)
-	case yaml.MappingNode:
-		return fltr.field(obj)
-	}
-	// not found -- this might be an error since the type doesn't match
-
-	return errors.Errorf("unsupported yaml node")
-}
-
-// field calls filter on the field matching the next path element
-func (fltr fieldSpecFilter) field(obj *yaml.RNode) error {
-	fieldName, isSeq := isSequenceField(fltr.path[0])
-
-	// lookup the field matching the next path element
-	var lookupField yaml.Filter
-	switch {
-	case !fltr.FieldSpec.CreateIfNotPresent || fltr.CreateKind == 0 || isSeq:
-		// dont' create the field if we don't find it
-		lookupField = yaml.Lookup(fieldName)
-	case len(fltr.path) <= 1:
-		// create the field if it is missing: use the provided node kind
-		lookupField = yaml.LookupCreate(fltr.CreateKind, fieldName)
-	default:
-		// create the field if it is missing: must be a mapping node
-		lookupField = yaml.LookupCreate(yaml.MappingNode, fieldName)
-	}
-
-	// locate (or maybe create) the field
-	field, err := obj.Pipe(lookupField)
-	if err != nil || field == nil {
-		return errors.WrapPrefixf(err, "fieldName: %s", fieldName)
-	}
-
-	// copy the current fltr and change the path on the copy
-	var next = fltr
-	// call filter for the next path element on the matching field
-	next.path = fltr.path[1:]
-	return next.filter(field)
-}
-
-// seq calls filter on all sequence elements
-func (fltr fieldSpecFilter) seq(obj *yaml.RNode) error {
-	if err := obj.VisitElements(func(node *yaml.RNode) error {
-		// recurse on each element -- re-allocating a fieldSpecFilter is
-		// not strictly required, but is more consistent with field
-		// and less likely to have side effects
-		// keep the entire path -- it does not contain parts for sequences
-		return fltr.filter(node)
-	}); err != nil {
-		return errors.WrapPrefixf(err,
-			"visit traversal on path: %v", fltr.path)
-	}
-
-	return nil
-}
-
-// isSequenceField returns true if the path element is for a sequence field.
-// isSequence also returns the path element with the '[]' suffix trimmed
-func isSequenceField(name string) (string, bool) {
-	isSeq := strings.HasSuffix(name, "[]")
-	name = strings.TrimSuffix(name, "[]")
-	return name, isSeq
-}
-
-// isMatchGVK returns true if the fs.GVK matches the obj GVK.
-func isMatchGVK(fs types.FieldSpec, obj *yaml.RNode) (bool, error) {
-	meta, err := obj.GetMeta()
-	if err != nil {
-		return false, err
-	}
-	if fs.Kind != "" && fs.Kind != meta.Kind {
-		// kind doesn't match
-		return false, err
-	}
-
-	// parse the group and version from the apiVersion field
-	group, version := parseGV(meta.APIVersion)
-
-	if fs.Group != "" && fs.Group != group {
-		// group doesn't match
-		return false, nil
-	}
-
-	if fs.Version != "" && fs.Version != version {
-		// version doesn't match
-		return false, nil
-	}
-
-	return true, nil
-}

api/filters/fsslice/fsslice.go

@@ -4,40 +4,28 @@
 package fsslice
 
 import (
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
-// SetFn sets a value
-type SetFn func(*yaml.RNode) error
-
-// SetScalar returns a SetFn to set a scalar value
-func SetScalar(value string) SetFn {
-	return func(node *yaml.RNode) error {
-		return node.PipeE(yaml.FieldSetter{StringValue: value})
-	}
-}
-
-// SetEntry returns a SetFn to set an entry in a map
-func SetEntry(key, value string) SetFn {
-	return func(node *yaml.RNode) error {
-		return node.PipeE(yaml.FieldSetter{
-			Name: key, StringValue: value})
-	}
-}
-
 var _ yaml.Filter = Filter{}
 
-// Filter uses an FsSlice to modify fields on a single object
+// Filter ranges over an FsSlice to modify fields on a single object.
+// An FsSlice is a range of FieldSpecs. A FieldSpec is a GVK plus a path.
 type Filter struct {
 	// FieldSpecList list of FieldSpecs to set
 	FsSlice types.FsSlice `yaml:"fsSlice"`
 
 	// SetValue is called on each field that matches one of the FieldSpecs
-	SetValue SetFn
+	SetValue filtersutil.SetFn
 
 	// CreateKind is used to create fields that do not exist
 	CreateKind yaml.Kind
+
+	// CreateTag is used to set the tag if encountering a null field
+	CreateTag string
 }
 
 func (fltr Filter) Filter(obj *yaml.RNode) (*yaml.RNode, error) {
@@ -45,10 +33,11 @@ func (fltr Filter) Filter(obj *yaml.RNode) (*yaml.RNode, error) {
 		// apply this FieldSpec
 		// create a new filter for each iteration because they
 		// store internal state about the field paths
-		_, err := (&fieldSpecFilter{
+		_, err := (&fieldspec.Filter{
 			FieldSpec:  fltr.FsSlice[i],
 			SetValue:   fltr.SetValue,
 			CreateKind: fltr.CreateKind,
+			CreateTag:  fltr.CreateTag,
 		}).Filter(obj)
 		if err != nil {
 			return nil, err

api/filters/fsslice/fsslice_test.go

@@ -9,335 +9,77 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"sigs.k8s.io/kustomize/api/filters/fsslice"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+	. "sigs.k8s.io/kustomize/api/filters/fsslice"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 type TestCase struct {
-	name     string
 	input    string
 	expected string
-	filter   fsslice.Filter
+	filter   Filter
 	fsSlice  string
 	error    string
 }
 
-var tests = []TestCase{
-	{
-		name: "update",
+var tests = map[string]TestCase{
+	"empty": {
 		fsSlice: `
-- path: a/b
-  group: foo
-  kind: Bar
 `,
 		input: `
-apiVersion: foo/v1beta1
+apiVersion: foo/v1
 kind: Bar
-a:
-  b: c
 `,
 		expected: `
-apiVersion: foo/v1beta1
+apiVersion: foo/v1
 kind: Bar
-a:
-  b: e
 `,
-		filter: fsslice.Filter{
-			SetValue: fsslice.SetScalar("e"),
-		},
-	},
-
-	{
-		name: "update-kind-not-match",
-		fsSlice: `
-- path: a/b
-  group: foo
-  kind: Bar1
-`,
-		input: `
-apiVersion: foo/v1beta1
-kind: Bar2
-a:
-  b: c
-`,
-		expected: `
-apiVersion: foo/v1beta1
-kind: Bar2
-a:
-  b: c
-`,
-		filter: fsslice.Filter{
-			SetValue: fsslice.SetScalar("e"),
-		},
-	},
-
-	{
-		name: "update-group-not-match",
-		fsSlice: `
-- path: a/b
-  group: foo1
-  kind: Bar
-`,
-		input: `
-apiVersion: foo2/v1beta1
-kind: Bar
-a:
-  b: c
-`,
-		expected: `
-apiVersion: foo2/v1beta1
-kind: Bar
-a:
-  b: c
-`,
-		filter: fsslice.Filter{
-			SetValue: fsslice.SetScalar("e"),
-		},
-	},
-
-	{
-		name: "update-version-not-match",
-		fsSlice: `
-- path: a/b
-  group: foo
-  version: v1beta1
-  kind: Bar
-`,
-		input: `
-apiVersion: foo/v1beta2
-kind: Bar
-a:
-  b: c
-`,
-		expected: `
-apiVersion: foo/v1beta2
-kind: Bar
-a:
-  b: c
-`,
-		filter: fsslice.Filter{
-			SetValue: fsslice.SetScalar("e"),
-		},
-	},
-
-	{
-		name: "bad-version",
-		fsSlice: `
-- path: a/b
-  group: foo
-  version: v1beta1
-  kind: Bar
-`,
-		input: `
-apiVersion: foo/v1beta2/something
-kind: Bar
-a:
-  b: c
-`,
-		expected: `
-apiVersion: foo/v1beta2/something
-kind: Bar
-a:
-  b: c
-`,
-		filter: fsslice.Filter{
-			SetValue: fsslice.SetScalar("e"),
-		},
-	},
-
-	{
-		name: "bad-meta",
-		fsSlice: `
-- path: a/b
-  group: foo
-  version: v1beta1
-  kind: Bar
-`,
-		input: `
-a:
-  b: c
-`,
-		filter: fsslice.Filter{
-			SetValue: fsslice.SetScalar("e"),
-		},
-		error: "missing Resource metadata",
-	},
-
-	{
-		name: "miss-match-type",
-		fsSlice: `
-- path: a/b/c
-  kind: Bar
-`,
-		input: `
-kind: Bar
-a:
-  b: a
-`,
-		error: "obj kind: Bar\na:\n  b: a\n at path a/b/c: unsupported yaml node",
-		filter: fsslice.Filter{
-			SetValue: fsslice.SetScalar("e"),
-		},
-	},
-
-	{
-		name: "add",
-		fsSlice: `
-- path: a/b/c/d
-  group: foo
-  create: true
-  kind: Bar
-`,
-		input: `
-apiVersion: foo/v1beta1
-kind: Bar
-a: {}
-`,
-		expected: `
-apiVersion: foo/v1beta1
-kind: Bar
-a: {b: {c: {d: e}}}
-`,
-		filter: fsslice.Filter{
-			SetValue:   fsslice.SetScalar("e"),
+		filter: Filter{
+			SetValue:   filtersutil.SetScalar("e"),
 			CreateKind: yaml.ScalarNode,
 		},
 	},
-
-	{
-		name: "update-in-sequence",
-		fsSlice: `
-- path: a/b[]/c/d
-  group: foo
-  kind: Bar
-`,
-		input: `
-apiVersion: foo/v1beta1
-kind: Bar
-a:
-  b:
-  - c:
-      d: a
-`,
-		expected: `
-apiVersion: foo/v1beta1
-kind: Bar
-a:
-  b:
-  - c:
-      d: e
-`,
-		filter: fsslice.Filter{
-			SetValue: fsslice.SetScalar("e"),
-		},
-	},
-
-	// Don't create a sequence
-	{
-		name: "empty-sequence-no-create",
-		fsSlice: `
-- path: a/b[]/c/d
-  group: foo
-  create: true
-  kind: Bar
-`,
-		input: `
-apiVersion: foo/v1beta1
-kind: Bar
-a: {}
-`,
-		expected: `
-apiVersion: foo/v1beta1
-kind: Bar
-a: {}
-`,
-		filter: fsslice.Filter{
-			SetValue:   fsslice.SetScalar("e"),
-			CreateKind: yaml.ScalarNode,
-		},
-	},
-
-	// Create a new field for an element in a sequence
-	{
-		name: "empty-sequence-create",
-		fsSlice: `
-- path: a/b[]/c/d
-  group: foo
-  create: true
-  kind: Bar
-`,
-		input: `
-apiVersion: foo/v1beta1
-kind: Bar
-a:
-  b:
-  - c: {}
-`,
-		expected: `
-apiVersion: foo/v1beta1
-kind: Bar
-a:
-  b:
-  - c: {d: e}
-`,
-		filter: fsslice.Filter{
-			SetValue:   fsslice.SetScalar("e"),
-			CreateKind: yaml.ScalarNode,
-		},
-	},
-
-	{
-		name: "group v1",
+	"two": {
 		fsSlice: `
 - path: a/b
-  group: v1
+  group: foo
+  version: v1
   create: true
   kind: Bar
-`,
-		input: `
-apiVersion: v1
-kind: Bar
-`,
-		expected: `
-apiVersion: v1
-kind: Bar
-`,
-		filter: fsslice.Filter{
-			SetValue:   fsslice.SetScalar("e"),
-			CreateKind: yaml.ScalarNode,
-		},
-	},
-
-	{
-		name: "version v1",
-		fsSlice: `
-- path: a/b
+- path: q/r[]/s/t
+  group: foo
   version: v1
   create: true
   kind: Bar
 `,
 		input: `
-apiVersion: v1
+apiVersion: foo/v1
 kind: Bar
+q:
+  r:
+  - s: {}
 `,
 		expected: `
-apiVersion: v1
+apiVersion: foo/v1
 kind: Bar
+q:
+  r:
+  - s: {t: e}
 a:
   b: e
 `,
-		filter: fsslice.Filter{
-			SetValue:   fsslice.SetScalar("e"),
+		filter: Filter{
+			SetValue:   filtersutil.SetScalar("e"),
 			CreateKind: yaml.ScalarNode,
 		},
 	},
 }
 
-func TestFilter_Filter(t *testing.T) {
-	for i := range tests {
-		test := tests[i]
-		t.Run(test.name, func(t *testing.T) {
+func TestFilter(t *testing.T) {
+	for name := range tests {
+		test := tests[name]
+		t.Run(name, func(t *testing.T) {
 			err := yaml.Unmarshal([]byte(test.fsSlice), &test.filter.FsSlice)
 			if !assert.NoError(t, err) {
 				t.FailNow()

api/filters/fsslice/gvk.go

@@ -1,49 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-package fsslice
-
-import (
-	"strings"
-
-	"sigs.k8s.io/kustomize/api/resid"
-	"sigs.k8s.io/kustomize/kyaml/yaml"
-)
-
-// Return true for 'v' followed by a 1 or 2, and don't look at rest.
-// I.e. 'v1', 'v1beta1', 'v2', would return true.
-func looksLikeACoreApiVersion(s string) bool {
-	if len(s) < 2 {
-		return false
-	}
-	if s[0:1] != "v" {
-		return false
-	}
-	return s[1:2] == "1" || s[1:2] == "2"
-}
-
-// parseGV parses apiVersion field into group and version.
-func parseGV(apiVersion string) (group, version string) {
-	// parse the group and version from the apiVersion field
-	parts := strings.SplitN(apiVersion, "/", 2)
-	group = parts[0]
-	if len(parts) > 1 {
-		version = parts[1]
-	}
-	// Special case the original "apiVersion" of what
-	// we now call the "core" (empty) group.
-	if version == "" && looksLikeACoreApiVersion(group) {
-		version = group
-		group = ""
-	}
-	return
-}
-
-// GetGVK parses the metadata into a GVK
-func GetGVK(meta yaml.ResourceMeta) resid.Gvk {
-	group, version := parseGV(meta.APIVersion)
-	return resid.Gvk{
-		Group:   group,
-		Version: version,
-		Kind:    meta.Kind,
-	}
-}

api/filters/fsslice/gvk_test.go

@@ -1,156 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-package fsslice
-
-import (
-	"strings"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"sigs.k8s.io/kustomize/api/resid"
-	"sigs.k8s.io/kustomize/kyaml/yaml"
-)
-
-func TestParseGV(t *testing.T) {
-	testCases := map[string]struct {
-		input           string
-		expectedGroup   string
-		expectedVersion string
-	}{
-		"empty": {
-			input:           "",
-			expectedGroup:   "",
-			expectedVersion: "",
-		},
-		"certSigning": {
-			input:           "certificates.k8s.io/v1beta1",
-			expectedGroup:   "certificates.k8s.io",
-			expectedVersion: "v1beta1",
-		},
-		"extensions": {
-			input:           "extensions/v1beta1",
-			expectedGroup:   "extensions",
-			expectedVersion: "v1beta1",
-		},
-		"normal": {
-			input:           "apps/v1",
-			expectedGroup:   "apps",
-			expectedVersion: "v1",
-		},
-		"justApps": {
-			input:           "apps",
-			expectedGroup:   "apps",
-			expectedVersion: "",
-		},
-		"coreV1": {
-			input:           "v1",
-			expectedGroup:   "",
-			expectedVersion: "v1",
-		},
-		"coreV2": {
-			input:           "v2",
-			expectedGroup:   "",
-			expectedVersion: "v2",
-		},
-		"coreV2Beta1": {
-			input:           "v2beta1",
-			expectedGroup:   "",
-			expectedVersion: "v2beta1",
-		},
-	}
-
-	for tn, tc := range testCases {
-		t.Run(tn, func(t *testing.T) {
-			group, version := parseGV(tc.input)
-			if !assert.Equal(t, tc.expectedGroup, group) {
-				t.FailNow()
-			}
-			if !assert.Equal(t, tc.expectedVersion, version) {
-				t.FailNow()
-			}
-		})
-	}
-}
-
-func TestGetGVK(t *testing.T) {
-	testCases := map[string]struct {
-		input      string
-		expected   resid.Gvk
-		parseError string
-		metaError  string
-	}{
-		"empty": {
-			input: `
-`,
-			parseError: "EOF",
-		},
-		"junk": {
-			input: `
-congress: effective
-`,
-			metaError: "missing Resource metadata",
-		},
-		"normal": {
-			input: `
-apiVersion: apps/v1
-kind: Deployment
-`,
-			expected: resid.Gvk{Group: "apps", Version: "v1", Kind: "Deployment"},
-		},
-		"apiVersionOnlyWithSlash": {
-			input: `
-apiVersion: apps/v1
-`,
-			expected: resid.Gvk{Group: "apps", Version: "v1", Kind: ""},
-		},
-		"apiVersionOnlyNoSlash1": {
-			input: `
-apiVersion: apps
-`,
-			expected: resid.Gvk{Group: "apps", Version: "", Kind: ""},
-		},
-		"apiVersionOnlyNoSlash2": {
-			input: `
-apiVersion: v1
-`,
-			expected: resid.Gvk{Group: "", Version: "v1", Kind: ""},
-		},
-	}
-
-	for tn, tc := range testCases {
-		t.Run(tn, func(t *testing.T) {
-			obj, err := yaml.Parse(tc.input)
-			if len(tc.parseError) != 0 {
-				if err == nil {
-					t.Error("expected parse error")
-					return
-				}
-				if !strings.Contains(err.Error(), tc.parseError) {
-					t.Errorf("expected parse err '%s', got '%v'", tc.parseError, err)
-				}
-				return
-			}
-			if !assert.NoError(t, err) {
-				t.FailNow()
-			}
-			meta, err := obj.GetMeta()
-			if len(tc.metaError) != 0 {
-				if err == nil {
-					t.Error("expected meta error")
-					return
-				}
-				if !strings.Contains(err.Error(), tc.metaError) {
-					t.Errorf("expected meta err '%s', got '%v'", tc.metaError, err)
-				}
-				return
-			}
-			if !assert.NoError(t, err) {
-				t.FailNow()
-			}
-			gvk := GetGVK(meta)
-			if !assert.Equal(t, tc.expected, gvk) {
-				t.FailNow()
-			}
-		})
-	}
-}

api/filters/iampolicygenerator/doc.go

@@ -0,0 +1,6 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package gkesagenerator contains a kio.Filter that that generates a
+// iampolicy-related resources for a given cloud provider
+package iampolicygenerator

api/filters/iampolicygenerator/example_test.go

@@ -0,0 +1,46 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package iampolicygenerator
+
+import (
+	"log"
+	"os"
+
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+func ExampleFilter() {
+	f := Filter{}
+	var err = yaml.Unmarshal([]byte(`
+cloud: gke
+kubernetesService: 
+  namespace: k8s-namespace
+  name: k8s-sa-name
+serviceAccount:
+  name: gsa-name
+  projectId: project-id
+`), &f)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = kio.Pipeline{
+		Inputs:  []kio.Reader{},
+		Filters: []kio.Filter{f},
+		Outputs: []kio.Writer{kio.ByteWriter{Writer: os.Stdout}},
+	}.Execute()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Output:
+	// apiVersion: v1
+	// kind: ServiceAccount
+	// metadata:
+	//   annotations:
+	//     iam.gke.io/gcp-service-account: gsa-name@project-id.iam.gserviceaccount.com
+	//   name: k8s-sa-name
+	//   namespace: k8s-namespace
+}

api/filters/iampolicygenerator/iampolicygenerator.go

@@ -0,0 +1,55 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package iampolicygenerator
+
+import (
+	"fmt"
+
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+type Filter struct {
+	IAMPolicyGenerator types.IAMPolicyGeneratorArgs `json:",inline,omitempty" yaml:",inline,omitempty"`
+}
+
+// Filter adds a GKE service account object to nodes
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	switch f.IAMPolicyGenerator.Cloud {
+	case types.GKE:
+		IAMPolicyResources, err := f.generateGkeIAMPolicyResources()
+		if err != nil {
+			return nil, err
+		}
+		nodes = append(nodes, IAMPolicyResources...)
+	default:
+		return nil, fmt.Errorf("cloud provider %s not supported yet", f.IAMPolicyGenerator.Cloud)
+	}
+	return nodes, nil
+}
+
+func (f Filter) generateGkeIAMPolicyResources() ([]*yaml.RNode, error) {
+	var result []*yaml.RNode
+	input := fmt.Sprintf(`
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  annotations:
+    iam.gke.io/gcp-service-account: %s@%s.iam.gserviceaccount.com
+  name: %s
+`, f.IAMPolicyGenerator.ServiceAccount.Name,
+		f.IAMPolicyGenerator.ProjectId,
+		f.IAMPolicyGenerator.KubernetesService.Name)
+
+	if f.IAMPolicyGenerator.Namespace != "" {
+		input += fmt.Sprintf("\n  namespace: %s", f.IAMPolicyGenerator.Namespace)
+	}
+
+	sa, err := yaml.Parse(input)
+	if err != nil {
+		return nil, err
+	}
+
+	return append(result, sa), nil
+}

api/filters/iampolicygenerator/iampolicygenerator_test.go

@@ -0,0 +1,75 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package iampolicygenerator
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	filtertest "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+)
+
+func TestFilter(t *testing.T) {
+	testCases := map[string]struct {
+		args     types.IAMPolicyGeneratorArgs
+		expected string
+	}{
+		"with namespace": {
+			args: types.IAMPolicyGeneratorArgs{
+				Cloud: types.GKE,
+				KubernetesService: types.KubernetesService{
+					Namespace: "k8s-namespace",
+					Name:      "k8s-sa-name",
+				},
+				ServiceAccount: types.ServiceAccount{
+					Name:      "gsa-name",
+					ProjectId: "project-id",
+				},
+			},
+			expected: `
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  annotations:
+    iam.gke.io/gcp-service-account: gsa-name@project-id.iam.gserviceaccount.com
+  name: k8s-sa-name
+  namespace: k8s-namespace
+`,
+		},
+		"without namespace": {
+			args: types.IAMPolicyGeneratorArgs{
+				Cloud: types.GKE,
+				KubernetesService: types.KubernetesService{
+					Name: "k8s-sa-name",
+				},
+				ServiceAccount: types.ServiceAccount{
+					Name:      "gsa-name",
+					ProjectId: "project-id",
+				},
+			},
+			expected: `
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  annotations:
+    iam.gke.io/gcp-service-account: gsa-name@project-id.iam.gserviceaccount.com
+  name: k8s-sa-name
+`,
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			f := Filter{
+				IAMPolicyGenerator: tc.args,
+			}
+			actual := filtertest.RunFilter(t, "", f)
+			if !assert.Equal(t, strings.TrimSpace(tc.expected), strings.TrimSpace(actual)) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/imagetag/imagetag.go

@@ -4,21 +4,36 @@
 package imagetag
 
 import (
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
 	"sigs.k8s.io/kustomize/api/filters/fsslice"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
+// Filter modifies an "image tag", the value used to specify the
+// name, tag, version digest etc. of (docker) container images
+// used by a pod template.
 type Filter struct {
 	// imageTag is the tag we want to apply to the inputs
+	// The name of the image is used as a key, and other fields
+	// can specify a new name, tag, etc.
 	ImageTag types.Image `json:"imageTag,omitempty" yaml:"imageTag,omitempty"`
 
-	// FsSlice contains the FieldSpecs to locate the namespace field
+	// FsSlice contains the FieldSpecs to locate an image field,
+	// e.g. Path: "spec/myContainers[]/image"
 	FsSlice types.FsSlice `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
+
+	trackableSetter filtersutil.TrackableSetter
 }
 
 var _ kio.Filter = Filter{}
+var _ kio.TrackableFilter = &Filter{}
+
+// WithMutationTracker registers a callback which will be invoked each time a field is mutated
+func (f *Filter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) {
+	f.trackableSetter.WithMutationTracker(callback)
+}
 
 func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
 	_, err := kio.FilterAll(yaml.FilterFunc(f.filter)).Filter(nodes)
@@ -26,19 +41,32 @@ func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
 }
 
 func (f Filter) filter(node *yaml.RNode) (*yaml.RNode, error) {
+	// FsSlice is an allowlist, not a denyList, so to deny
+	// something via configuration a new config mechanism is
+	// needed. Until then, hardcode it.
+	if f.isOnDenyList(node) {
+		return node, nil
+	}
 	if err := node.PipeE(fsslice.Filter{
-		FsSlice:  f.FsSlice,
-		SetValue: updateImageTagFn(f.ImageTag),
+		FsSlice: f.FsSlice,
+		SetValue: imageTagUpdater{
+			ImageTag:        f.ImageTag,
+			trackableSetter: f.trackableSetter,
+		}.SetImageValue,
 	}); err != nil {
 		return nil, err
 	}
 	return node, nil
 }
 
-func updateImageTagFn(imageTag types.Image) fsslice.SetFn {
-	return func(node *yaml.RNode) error {
-		return node.PipeE(imageTagUpdater{
-			ImageTag: imageTag,
-		})
+func (f Filter) isOnDenyList(node *yaml.RNode) bool {
+	meta, err := node.GetMeta()
+	if err != nil {
+		// A missing 'meta' field will cause problems elsewhere;
+		// ignore it here to keep the signature simple.
+		return false
 	}
+	// Ignore CRDs
+	// https://github.com/kubernetes-sigs/kustomize/issues/890
+	return meta.Kind == `CustomResourceDefinition`
 }

api/filters/imagetag/imagetag_test.go

@@ -10,15 +10,175 @@ import (
 	"github.com/stretchr/testify/assert"
 	filtertest "sigs.k8s.io/kustomize/api/testutils/filtertest"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 func TestImageTagUpdater_Filter(t *testing.T) {
+	mutationTrackerStub := filtertest.MutationTrackerStub{}
 	testCases := map[string]struct {
-		input          string
-		expectedOutput string
-		filter         Filter
-		fsSlice        types.FsSlice
+		input                string
+		expectedOutput       string
+		filter               Filter
+		fsSlice              types.FsSlice
+		setValueCallback     func(key, value, tag string, node *yaml.RNode)
+		expectedSetValueArgs []filtertest.SetValueArg
 	}{
+		"ignore CustomResourceDefinition": {
+			input: `
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  name: whatever
+spec:
+  containers:
+  - image: whatever
+`,
+			expectedOutput: `
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  name: whatever
+spec:
+  containers:
+  - image: whatever
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "whatever",
+					NewName: "theImageShouldNotChangeInACrd",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/containers/image",
+				},
+			},
+		},
+
+		"legacy multiple images in containers": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - image: nginx:1.2.1
+  - image: nginx:2.1.2
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - image: apache@12345
+  - image: apache@12345
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					Digest:  "12345",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/containers/image",
+				},
+			},
+		},
+		"legacy both containers and initContainers": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - image: nginx:1.2.1
+  - image: tomcat:1.2.3
+  initContainers:
+  - image: nginx:1.2.1
+  - image: apache:1.2.3
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - image: apache:3.2.1
+  - image: tomcat:1.2.3
+  initContainers:
+  - image: apache:3.2.1
+  - image: apache:1.2.3
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					NewTag:  "3.2.1",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/containers/image",
+				},
+				{
+					Path: "spec/initContainers/image",
+				},
+			},
+		},
+		"legacy updates at multiple depths": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - image: nginx:1.2.1
+  - image: tomcat:1.2.3
+  template:
+    spec:
+      initContainers:
+      - image: nginx:1.2.1
+      - image: apache:1.2.3
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - image: apache:3.2.1
+  - image: tomcat:1.2.3
+  template:
+    spec:
+      initContainers:
+      - image: apache:3.2.1
+      - image: apache:1.2.3
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					NewTag:  "3.2.1",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/containers/image",
+				},
+				{
+					Path: "spec/template/spec/initContainers/image",
+				},
+			},
+		},
 		"update with digest": {
 			input: `
 apiVersion: example.com/v1
@@ -49,6 +209,7 @@ spec:
 				},
 			},
 		},
+
 		"multiple matches in sequence": {
 			input: `
 apiVersion: example.com/v1
@@ -85,17 +246,731 @@ spec:
 				},
 			},
 		},
+
+		"new Tag": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:latest
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx
+        name: nginx-notag
+      - image: nginx@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:v2
+        name: nginx-tagged
+      - image: nginx:v2
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx:v2
+        name: nginx-notag
+      - image: nginx:v2
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:   "nginx",
+					NewTag: "v2",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/containers[]/image",
+				},
+				{
+					Path: "spec/template/spec/initContainers[]/image",
+				},
+			},
+		},
+		"newImage": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:latest
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx
+        name: nginx-notag
+      - image: nginx@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: busybox:1.7.9
+        name: nginx-tagged
+      - image: busybox:latest
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: busybox
+        name: nginx-notag
+      - image: busybox@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "busybox",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/containers[]/image",
+				},
+				{
+					Path: "spec/template/spec/initContainers[]/image",
+				},
+			},
+		},
+		"newImageAndTag": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:latest
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx
+        name: nginx-notag
+      - image: nginx@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: busybox:v3
+        name: nginx-tagged
+      - image: busybox:v3
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: busybox:v3
+        name: nginx-notag
+      - image: busybox:v3
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "busybox",
+					NewTag:  "v3",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/containers[]/image",
+				},
+				{
+					Path: "spec/template/spec/initContainers[]/image",
+				},
+			},
+		},
+		"newDigest": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:latest
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx
+        name: nginx-notag
+      - image: nginx@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx@sha256:222222222222222222
+        name: nginx-tagged
+      - image: nginx@sha256:222222222222222222
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx@sha256:222222222222222222
+        name: nginx-notag
+      - image: nginx@sha256:222222222222222222
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:   "nginx",
+					Digest: "sha256:222222222222222222",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/containers/image",
+				},
+				{
+					Path: "spec/template/spec/initContainers/image",
+				},
+			},
+		},
+		"newImageAndDigest": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:latest
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx
+        name: nginx-notag
+      - image: nginx@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: busybox@sha256:222222222222222222
+        name: nginx-tagged
+      - image: busybox@sha256:222222222222222222
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: busybox@sha256:222222222222222222
+        name: nginx-notag
+      - image: busybox@sha256:222222222222222222
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "busybox",
+					Digest:  "sha256:222222222222222222",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/containers[]/image",
+				},
+				{
+					Path: "spec/template/spec/initContainers[]/image",
+				},
+			},
+		},
+		"emptyContainers": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  containers:
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  containers: []
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:   "nginx",
+					NewTag: "v2",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/containers[]/image",
+					//					CreateIfNotPresent: true,
+				},
+			},
+		},
+		"tagWithBraces": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: some.registry.io/my-image:{GENERATED_TAG}
+        name: my-image
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: some.registry.io/my-image:my-fixed-tag
+        name: my-image
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:   "some.registry.io/my-image",
+					NewTag: "my-fixed-tag",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/containers[]/image",
+				},
+				{
+					Path: "spec/template/spec/initContainers[]/image",
+				},
+			},
+		},
+		"mutation tracker": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:latest
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx
+        name: nginx-notag
+      - image: nginx@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: busybox:v3
+        name: nginx-tagged
+      - image: busybox:v3
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: busybox:v3
+        name: nginx-notag
+      - image: busybox:v3
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "busybox",
+					NewTag:  "v3",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/containers[]/image",
+				},
+				{
+					Path: "spec/template/spec/initContainers[]/image",
+				},
+			},
+			setValueCallback: mutationTrackerStub.MutationTracker,
+			expectedSetValueArgs: []filtertest.SetValueArg{
+				{
+					Value:    "busybox:v3",
+					NodePath: []string{"spec", "template", "spec", "containers", "image"},
+				},
+				{
+					Value:    "busybox:v3",
+					NodePath: []string{"spec", "template", "spec", "containers", "image"},
+				},
+				{
+					Value:    "busybox:v3",
+					NodePath: []string{"spec", "template", "spec", "initContainers", "image"},
+				},
+				{
+					Value:    "busybox:v3",
+					NodePath: []string{"spec", "template", "spec", "initContainers", "image"},
+				},
+			},
+		},
+		"image with tag and digest new name": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  image: nginx:1.2.1@sha256:46d5b90a7f4e9996351ad893a26bcbd27216676ad4d5316088ce351fb2c2c3dd
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  image: apache:1.2.1@sha256:46d5b90a7f4e9996351ad893a26bcbd27216676ad4d5316088ce351fb2c2c3dd
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/image",
+				},
+			},
+		},
+		"image with tag and digest new name new tag": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  image: nginx:1.2.1@sha256:46d5b90a7f4e9996351ad893a26bcbd27216676ad4d5316088ce351fb2c2c3dd
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  image: apache:1.3.0
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					NewTag:  "1.3.0",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/image",
+				},
+			},
+		},
+		"image with tag and digest new name new tag and digest": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  image: nginx:1.2.1@sha256:46d5b90a7f4e9996351ad893a26bcbd27216676ad4d5316088ce351fb2c2c3dd
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  image: apache:1.3.0@sha256:xyz
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					NewTag:  "1.3.0",
+					Digest:  "sha256:xyz",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/image",
+				},
+			},
+		},
+		"updateimagesuffix": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploysuffix
+spec:
+  template:
+    spec:
+      containers:
+      - image: redis:6.2.6
+        name: redis
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploysuffix
+spec:
+  template:
+    spec:
+      containers:
+      - image: redis:6.2.6-alpine
+        name: redis
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:      "redis",
+					TagSuffix: "-alpine",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/containers[]/image",
+				},
+			},
+		},
+		"update image volume in pod template": {
+			input: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: imagevolume
+spec:
+  template:
+    spec:
+      volumes:
+      - name: volume
+        image:
+          reference: nginx
+`,
+			expectedOutput: `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: imagevolume
+spec:
+  template:
+    spec:
+      volumes:
+      - name: volume
+        image:
+          reference: apache@12345
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					Digest:  "12345",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/template/spec/volumes[]/image/reference",
+				},
+			},
+		},
+		"update image volume in pod spec": {
+			input: `
+apiVersion: v1
+kind: Pod
+metadata:
+  name: imagevolume
+spec:
+  volumes:
+  - name: volume
+    image:
+      reference: nginx
+`,
+			expectedOutput: `
+apiVersion: v1
+kind: Pod
+metadata:
+  name: imagevolume
+spec:
+  volumes:
+  - name: volume
+    image:
+      reference: apache@12345
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					Digest:  "12345",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/volumes[]/image/reference",
+				},
+			},
+		},
 	}
 
 	for tn, tc := range testCases {
+		mutationTrackerStub.Reset()
 		t.Run(tn, func(t *testing.T) {
 			filter := tc.filter
+			filter.WithMutationTracker(tc.setValueCallback)
 			filter.FsSlice = tc.fsSlice
 			if !assert.Equal(t,
 				strings.TrimSpace(tc.expectedOutput),
 				strings.TrimSpace(filtertest.RunFilter(t, tc.input, filter))) {
 				t.FailNow()
 			}
+			assert.Equal(t, tc.expectedSetValueArgs, mutationTrackerStub.SetValueArgs())
 		})
 	}
 }

api/filters/imagetag/legacy.go

@@ -4,7 +4,9 @@
 package imagetag
 
 import (
+	"sigs.k8s.io/kustomize/api/internal/utils"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/errors"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
@@ -74,28 +76,17 @@ func (f findFieldsFilter) walk(node *yaml.RNode) error {
 				return err
 			}
 			key := n.Key.YNode().Value
-			if contains(f.fields, key) {
+			if utils.StringSliceContains(f.fields, key) {
 				return f.fieldCallback(n.Value)
 			}
 			return nil
 		})
 	case yaml.SequenceNode:
-		return node.VisitElements(func(n *yaml.RNode) error {
-			return f.walk(n)
-		})
+		return errors.Wrap(node.VisitElements(f.walk))
 	}
 	return nil
 }
 
-func contains(slice []string, str string) bool {
-	for _, s := range slice {
-		if s == str {
-			return true
-		}
-	}
-	return false
-}
-
 func checkImageTagsFn(imageTag types.Image) fieldCallback {
 	return func(node *yaml.RNode) error {
 		if node.YNode().Kind != yaml.SequenceNode {

api/filters/imagetag/updater.go

@@ -4,7 +4,9 @@
 package imagetag
 
 import (
-	"sigs.k8s.io/kustomize/api/image"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+
+	"sigs.k8s.io/kustomize/api/internal/image"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
@@ -13,31 +15,57 @@ import (
 // that will update the value of the yaml node based on the provided
 // ImageTag if the current value matches the format of an image reference.
 type imageTagUpdater struct {
-	Kind     string      `yaml:"kind,omitempty"`
-	ImageTag types.Image `yaml:"imageTag,omitempty"`
+	Kind            string      `yaml:"kind,omitempty"`
+	ImageTag        types.Image `yaml:"imageTag,omitempty"`
+	trackableSetter filtersutil.TrackableSetter
 }
 
-func (u imageTagUpdater) Filter(rn *yaml.RNode) (*yaml.RNode, error) {
+func (u imageTagUpdater) SetImageValue(rn *yaml.RNode) error {
 	if err := yaml.ErrorIfInvalid(rn, yaml.ScalarNode); err != nil {
-		return nil, err
+		return err
 	}
 
 	value := rn.YNode().Value
 
 	if !image.IsImageMatched(value, u.ImageTag.Name) {
-		return rn, nil
+		return nil
 	}
 
-	name, tag := image.Split(value)
+	name, tag, digest := image.Split(value)
 	if u.ImageTag.NewName != "" {
 		name = u.ImageTag.NewName
 	}
-	if u.ImageTag.NewTag != "" {
-		tag = ":" + u.ImageTag.NewTag
-	}
-	if u.ImageTag.Digest != "" {
-		tag = "@" + u.ImageTag.Digest
+
+	// overriding tag or digest will replace both original tag and digest values
+	switch {
+	case u.ImageTag.NewTag != "" && u.ImageTag.Digest != "":
+		tag = u.ImageTag.NewTag
+		digest = u.ImageTag.Digest
+	case u.ImageTag.NewTag != "":
+		tag = u.ImageTag.NewTag
+		digest = ""
+	case u.ImageTag.Digest != "":
+		tag = ""
+		digest = u.ImageTag.Digest
+	case u.ImageTag.TagSuffix != "":
+		tag += u.ImageTag.TagSuffix
+		digest = ""
 	}
 
-	return rn.Pipe(yaml.FieldSetter{StringValue: name + tag})
+	// build final image name
+	if tag != "" {
+		name += ":" + tag
+	}
+	if digest != "" {
+		name += "@" + digest
+	}
+
+	return u.trackableSetter.SetScalar(name)(rn)
+}
+
+func (u imageTagUpdater) Filter(rn *yaml.RNode) (*yaml.RNode, error) {
+	if err := u.SetImageValue(rn); err != nil {
+		return nil, err
+	}
+	return rn, nil
 }

api/filters/labels/labels.go

@@ -20,19 +20,29 @@ type Filter struct {
 
 	// FsSlice identifies the label fields.
 	FsSlice types.FsSlice
+
+	trackableSetter filtersutil.TrackableSetter
 }
 
 var _ kio.Filter = Filter{}
+var _ kio.TrackableFilter = &Filter{}
+
+// WithMutationTracker registers a callback which will be invoked each time a field is mutated
+func (f *Filter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) {
+	f.trackableSetter.WithMutationTracker(callback)
+}
 
 func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
-	keys := filtersutil.SortedMapKeys(f.Labels)
+	keys := yaml.SortedMapKeys(f.Labels)
 	_, err := kio.FilterAll(yaml.FilterFunc(
 		func(node *yaml.RNode) (*yaml.RNode, error) {
 			for _, k := range keys {
 				if err := node.PipeE(fsslice.Filter{
-					FsSlice:    f.FsSlice,
-					SetValue:   fsslice.SetEntry(k, f.Labels[k]),
+					FsSlice: f.FsSlice,
+					SetValue: f.trackableSetter.SetEntry(
+						k, f.Labels[k], yaml.NodeTagString),
 					CreateKind: yaml.MappingNode, // Labels are MappingNodes.
+					CreateTag:  yaml.NodeTagMap,
 				}); err != nil {
 					return nil, err
 				}

api/filters/labels/labels_test.go

@@ -8,16 +8,20 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"sigs.k8s.io/kustomize/api/resid"
 	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/resid"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 func TestLabels_Filter(t *testing.T) {
+	mutationTrackerStub := filtertest_test.MutationTrackerStub{}
 	testCases := map[string]struct {
-		input          string
-		expectedOutput string
-		filter         Filter
+		input                string
+		expectedOutput       string
+		filter               Filter
+		setEntryCallback     func(key, value, tag string, node *yaml.RNode)
+		expectedSetEntryArgs []filtertest_test.SetValueArg
 	}{
 		"add": {
 			input: `
@@ -291,15 +295,182 @@ metadata:
 				},
 			},
 		},
+
+		"number": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    hero: batman
+    fiend: riddler
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    hero: batman
+    fiend: riddler
+    1: emmett kelley
+    auto: "2"
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"1":    "emmett kelley",
+					"auto": "2",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+
+		// test quoting of values which are not considered strings in yaml 1.1
+		"yaml_1_1_compatibility": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    hero: batman
+    fiend: riddler
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    hero: batman
+    fiend: riddler
+    a: "y"
+    b: y1
+    c: "yes"
+    d: yes1
+    e: "true"
+    f: true1
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"a": "y",
+					"b": "y1",
+					"c": "yes",
+					"d": "yes1",
+					"e": "true",
+					"f": "true1",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+
+		"null_labels": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels: null
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    a: a1
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"a": "a1",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+
+		// test usage of SetEntryCallback
+		"set_entry_callback": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    witcher: geralt
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    witcher: geralt
+    mage: yennefer
+a:
+  b:
+    mage: yennefer
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"mage": "yennefer",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+					{
+						Path:               "a/b",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+			setEntryCallback: mutationTrackerStub.MutationTracker,
+			expectedSetEntryArgs: []filtertest_test.SetValueArg{
+				{
+					Key:      "mage",
+					Value:    "yennefer",
+					Tag:      "!!str",
+					NodePath: []string{"metadata", "labels"},
+				},
+				{
+					Key:      "mage",
+					Value:    "yennefer",
+					Tag:      "!!str",
+					NodePath: []string{"a", "b"},
+				},
+			},
+		},
 	}
 
 	for tn, tc := range testCases {
+		mutationTrackerStub.Reset()
 		t.Run(tn, func(t *testing.T) {
+			tc.filter.WithMutationTracker(tc.setEntryCallback)
 			if !assert.Equal(t,
 				strings.TrimSpace(tc.expectedOutput),
 				strings.TrimSpace(filtertest_test.RunFilter(t, tc.input, tc.filter))) {
 				t.FailNow()
 			}
+			if !assert.Equal(t, tc.expectedSetEntryArgs, mutationTrackerStub.SetValueArgs()) {
+				t.FailNow()
+			}
 		})
 	}
 }

api/filters/nameref/doc.go

@@ -0,0 +1,6 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package nameref contains a kio.Filter implementation of the kustomize
+// name reference transformer.
+package nameref

api/filters/nameref/nameref.go

@@ -0,0 +1,416 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package nameref
+
+import (
+	"fmt"
+	"strings"
+
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/resmap"
+	"sigs.k8s.io/kustomize/api/resource"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/errors"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/resid"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// Filter updates a name references.
+type Filter struct {
+	// Referrer refers to another resource X by X's name.
+	// E.g. A Deployment can refer to a ConfigMap.
+	// The Deployment is the Referrer,
+	// the ConfigMap is the ReferralTarget.
+	// This filter seeks to repair the reference in Deployment, given
+	// that the ConfigMap's name may have changed.
+	Referrer *resource.Resource
+
+	// NameFieldToUpdate is the field in the Referrer
+	// that holds the name requiring an update.
+	// This is the field to write.
+	NameFieldToUpdate types.FieldSpec
+
+	// ReferralTarget is the source of the new value for
+	// the name, always in the 'metadata/name' field.
+	// This is the field to read.
+	ReferralTarget resid.Gvk
+
+	// Set of resources to scan to find the ReferralTarget.
+	ReferralCandidates resmap.ResMap
+}
+
+// At time of writing, in practice this is called with a slice with only
+// one entry, the node also referred to be the resource in the Referrer field.
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	return kio.FilterAll(yaml.FilterFunc(f.run)).Filter(nodes)
+}
+
+// The node passed in here is the same node as held in Referrer;
+// that's how the referrer's name field is updated.
+// Currently, however, this filter still needs the extra methods on Referrer
+// to consult things like the resource Id, its namespace, etc.
+// TODO(3455): No filter should use the Resource api; all information
+// about names should come from annotations, with helper methods
+// on the RNode object.  Resource should get stupider, RNode smarter.
+func (f Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
+	if err := f.confirmNodeMatchesReferrer(node); err != nil {
+		// sanity check.
+		return nil, err
+	}
+	f.NameFieldToUpdate.Gvk = f.Referrer.GetGvk()
+	if err := node.PipeE(fieldspec.Filter{
+		FieldSpec: f.NameFieldToUpdate,
+		SetValue:  f.set,
+	}); err != nil {
+		return nil, errors.WrapPrefixf(
+			err, "updating name reference in '%s' field of '%s'",
+			f.NameFieldToUpdate.Path, f.Referrer.CurId().String())
+	}
+	return node, nil
+}
+
+// This function is called on the node found at FieldSpec.Path.
+// It's some node in the Referrer.
+func (f Filter) set(node *yaml.RNode) error {
+	if yaml.IsMissingOrNull(node) {
+		return nil
+	}
+	switch node.YNode().Kind {
+	case yaml.ScalarNode:
+		return f.setScalar(node)
+	case yaml.MappingNode:
+		return f.setMapping(node)
+	case yaml.SequenceNode:
+		return applyFilterToSeq(seqFilter{
+			setScalarFn:  f.setScalar,
+			setMappingFn: f.setMapping,
+		}, node)
+	default:
+		return fmt.Errorf("node must be a scalar, sequence or map")
+	}
+}
+
+// This method used when NameFieldToUpdate doesn't lead to
+// one scalar field (typically called 'name'), but rather
+// leads to a map field (called anything). In this case we
+// must complete the field path, looking for both  a 'name'
+// and a 'namespace' field to help select the proper
+// ReferralTarget to read the name and namespace from.
+func (f Filter) setMapping(node *yaml.RNode) error {
+	if node.YNode().Kind != yaml.MappingNode {
+		return fmt.Errorf("expect a mapping node")
+	}
+	nameNode, err := node.Pipe(yaml.FieldMatcher{Name: "name"})
+	if err != nil {
+		return errors.WrapPrefixf(err, "trying to match 'name' field")
+	}
+	if nameNode == nil {
+		// This is a _configuration_ error; the field path
+		// specified in NameFieldToUpdate.Path doesn't resolve
+		// to a map with a 'name' field, so we have no idea what
+		// field to update with a new name.
+		return fmt.Errorf("path config error; no 'name' field in node")
+	}
+	candidates, err := f.filterMapCandidatesByNamespace(node)
+	if err != nil {
+		return err
+	}
+	oldName := nameNode.YNode().Value
+	// use allNamesAndNamespacesAreTheSame to compare referral candidates for functional identity,
+	// because we source both name and namespace values from the referral in this case.
+	referral, err := f.selectReferral(oldName, candidates, allNamesAndNamespacesAreTheSame)
+	if err != nil || referral == nil {
+		// Nil referral means nothing to do.
+		return err
+	}
+	f.recordTheReferral(referral)
+	if referral.GetName() == oldName && referral.GetNamespace() == "" {
+		// The name has not changed, nothing to do.
+		return nil
+	}
+	if err = node.PipeE(yaml.FieldSetter{
+		Name:        "name",
+		StringValue: referral.GetName(),
+	}); err != nil {
+		return err
+	}
+	if referral.GetNamespace() == "" {
+		// Don't write an empty string into the namespace field, as
+		// it should not replace the value "default".  The empty
+		// string is handled as a wild card here, not as an implicit
+		// specification of the "default" k8s namespace.
+		return nil
+	}
+	return node.PipeE(yaml.FieldSetter{
+		Name:        "namespace",
+		StringValue: referral.GetNamespace(),
+	})
+}
+
+func (f Filter) filterMapCandidatesByNamespace(
+	node *yaml.RNode) ([]*resource.Resource, error) {
+	namespaceNode, err := node.Pipe(yaml.FieldMatcher{Name: "namespace"})
+	if err != nil {
+		return nil, errors.WrapPrefixf(err, "trying to match 'namespace' field")
+	}
+	if namespaceNode == nil {
+		return f.ReferralCandidates.Resources(), nil
+	}
+	namespace := namespaceNode.YNode().Value
+	nsMap := f.ReferralCandidates.GroupedByOriginalNamespace()
+	if candidates, ok := nsMap[namespace]; ok {
+		return candidates, nil
+	}
+	nsMap = f.ReferralCandidates.GroupedByCurrentNamespace()
+	// This could be nil, or an empty list.
+	return nsMap[namespace], nil
+}
+
+func (f Filter) setScalar(node *yaml.RNode) error {
+	// use allNamesAreTheSame to compare referral candidates for functional identity,
+	// because we only source the name from the referral in this case.
+	referral, err := f.selectReferral(
+		node.YNode().Value, f.ReferralCandidates.Resources(), allNamesAreTheSame)
+	if err != nil || referral == nil {
+		// Nil referral means nothing to do.
+		return err
+	}
+	f.recordTheReferral(referral)
+	if referral.GetName() == node.YNode().Value {
+		// The name has not changed, nothing to do.
+		return nil
+	}
+	return node.PipeE(yaml.FieldSetter{StringValue: referral.GetName()})
+}
+
+// In the resource, make a note that it is referred to by the Referrer.
+func (f Filter) recordTheReferral(referral *resource.Resource) {
+	referral.AppendRefBy(f.Referrer.CurId())
+}
+
+// getRoleRefGvk returns a Gvk in the roleRef field. Return error
+// if the roleRef, roleRef/apiGroup or roleRef/kind is missing.
+func getRoleRefGvk(n *resource.Resource) (*resid.Gvk, error) {
+	roleRef, err := n.Pipe(yaml.Lookup("roleRef"))
+	if err != nil {
+		return nil, err
+	}
+	if roleRef.IsNil() {
+		return nil, fmt.Errorf("roleRef cannot be found in %s", n.MustString())
+	}
+	apiGroup, err := roleRef.Pipe(yaml.Lookup("apiGroup"))
+	if err != nil {
+		return nil, err
+	}
+	if apiGroup.IsNil() {
+		return nil, fmt.Errorf(
+			"apiGroup cannot be found in roleRef %s", roleRef.MustString())
+	}
+	kind, err := roleRef.Pipe(yaml.Lookup("kind"))
+	if err != nil {
+		return nil, err
+	}
+	if kind.IsNil() {
+		return nil, fmt.Errorf(
+			"kind cannot be found in roleRef %s", roleRef.MustString())
+	}
+	return &resid.Gvk{
+		Group: apiGroup.YNode().Value,
+		Kind:  kind.YNode().Value,
+	}, nil
+}
+
+// sieveFunc returns true if the resource argument satisfies some criteria.
+type sieveFunc func(*resource.Resource) bool
+
+// doSieve uses a function to accept or ignore resources from a list.
+// If list is nil, returns immediately.
+// It's a filter obviously, but that term is overloaded here.
+func doSieve(list []*resource.Resource, fn sieveFunc) (s []*resource.Resource) {
+	for _, r := range list {
+		if fn(r) {
+			s = append(s, r)
+		}
+	}
+	return
+}
+
+func acceptAll(r *resource.Resource) bool {
+	return true
+}
+
+func previousNameMatches(name string) sieveFunc {
+	return func(r *resource.Resource) bool {
+		for _, id := range r.PrevIds() {
+			if id.Name == name {
+				return true
+			}
+		}
+		return false
+	}
+}
+
+func previousIdSelectedByGvk(gvk *resid.Gvk) sieveFunc {
+	return func(r *resource.Resource) bool {
+		for _, id := range r.PrevIds() {
+			if id.IsSelected(gvk) {
+				return true
+			}
+		}
+		return false
+	}
+}
+
+// If the we are updating a 'roleRef/name' field, the 'apiGroup' and 'kind'
+// fields in the same 'roleRef' map must be considered.
+// If either object is cluster-scoped, there can be a referral.
+// E.g. a RoleBinding (which exists in a namespace) can refer
+// to a ClusterRole (cluster-scoped) object.
+// https://kubernetes.io/docs/reference/access-authn-authz/rbac/#role-and-clusterrole
+// Likewise, a ClusterRole can refer to a Secret (in a namespace).
+// Objects in different namespaces generally cannot refer to other
+// with some exceptions (e.g. RoleBinding and ServiceAccount are both
+// namespaceable, but the former can refer to accounts in other namespaces).
+func (f Filter) roleRefFilter() sieveFunc {
+	if !strings.HasSuffix(f.NameFieldToUpdate.Path, "roleRef/name") {
+		return acceptAll
+	}
+	roleRefGvk, err := getRoleRefGvk(f.Referrer)
+	if err != nil {
+		return acceptAll
+	}
+	return previousIdSelectedByGvk(roleRefGvk)
+}
+
+func prefixSuffixEquals(other resource.ResCtx, allowEmpty bool) sieveFunc {
+	return func(r *resource.Resource) bool {
+		return r.PrefixesSuffixesEquals(other, allowEmpty)
+	}
+}
+
+func (f Filter) sameCurrentNamespaceAsReferrer() sieveFunc {
+	referrerCurId := f.Referrer.CurId()
+	if referrerCurId.IsClusterScoped() {
+		// If the referrer is cluster-scoped, let anything through.
+		return acceptAll
+	}
+	return func(r *resource.Resource) bool {
+		if r.CurId().IsClusterScoped() {
+			// Allow cluster-scoped through.
+			return true
+		}
+		if r.GetKind() == "ServiceAccount" {
+			// Allow service accounts through, even though they
+			// are in a namespace.  A RoleBinding in another namespace
+			// can reference them.
+			return true
+		}
+		return referrerCurId.IsNsEquals(r.CurId())
+	}
+}
+
+// selectReferral picks the best referral from a list of candidates.
+func (f Filter) selectReferral(
+	// The name referral that may need to be updated.
+	oldName string,
+	candidates []*resource.Resource,
+	// function that returns whether two referrals are identical for the purposes of the transformation
+	candidatesIdentical func(resources []*resource.Resource) bool) (*resource.Resource, error) {
+	candidates = doSieve(candidates, previousNameMatches(oldName))
+	candidates = doSieve(candidates, previousIdSelectedByGvk(&f.ReferralTarget))
+	candidates = doSieve(candidates, f.roleRefFilter())
+	candidates = doSieve(candidates, f.sameCurrentNamespaceAsReferrer())
+	if len(candidates) == 1 {
+		return candidates[0], nil
+	}
+	candidates = doSieve(candidates, prefixSuffixEquals(f.Referrer, true))
+	if len(candidates) > 1 {
+		candidates = doSieve(candidates, prefixSuffixEquals(f.Referrer, false))
+	}
+	if len(candidates) == 1 {
+		return candidates[0], nil
+	}
+	if len(candidates) == 0 {
+		return nil, nil
+	}
+	if candidatesIdentical(candidates) {
+		// Just take the first one.
+		return candidates[0], nil
+	}
+	ids := getIds(candidates)
+	return nil, fmt.Errorf("found multiple possible referrals: %s\n%s", ids, f.failureDetails(candidates))
+}
+
+func (f Filter) failureDetails(resources []*resource.Resource) string {
+	msg := strings.Builder{}
+	msg.WriteString(fmt.Sprintf("\n**** Too many possible referral targets to referrer:\n%s\n", f.Referrer.MustYaml()))
+	for i, r := range resources {
+		msg.WriteString(fmt.Sprintf("--- possible referral %d:\n%s\n", i, r.MustYaml()))
+	}
+	return msg.String()
+}
+
+func allNamesAreTheSame(resources []*resource.Resource) bool {
+	name := resources[0].GetName()
+	for i := 1; i < len(resources); i++ {
+		if name != resources[i].GetName() {
+			return false
+		}
+	}
+	return true
+}
+
+func allNamesAndNamespacesAreTheSame(resources []*resource.Resource) bool {
+	name := resources[0].GetName()
+	namespace := resources[0].GetNamespace()
+	for i := 1; i < len(resources); i++ {
+		if name != resources[i].GetName() || namespace != resources[i].GetNamespace() {
+			return false
+		}
+	}
+	return true
+}
+
+func getIds(rs []*resource.Resource) string {
+	var result []string
+	for _, r := range rs {
+		result = append(result, r.CurId().String())
+	}
+	return strings.Join(result, ", ")
+}
+
+func checkEqual(k, a, b string) error {
+	if a != b {
+		return fmt.Errorf(
+			"node-referrerOriginal '%s' mismatch '%s' != '%s'",
+			k, a, b)
+	}
+	return nil
+}
+
+func (f Filter) confirmNodeMatchesReferrer(node *yaml.RNode) error {
+	meta, err := node.GetMeta()
+	if err != nil {
+		return err
+	}
+	gvk := f.Referrer.GetGvk()
+	if err = checkEqual(
+		"APIVersion", meta.APIVersion, gvk.ApiVersion()); err != nil {
+		return err
+	}
+	if err = checkEqual(
+		"Kind", meta.Kind, gvk.Kind); err != nil {
+		return err
+	}
+	if err = checkEqual(
+		"Name", meta.Name, f.Referrer.GetName()); err != nil {
+		return err
+	}
+	if err = checkEqual(
+		"Namespace", meta.Namespace, f.Referrer.GetNamespace()); err != nil {
+		return err
+	}
+	return nil
+}

api/filters/nameref/nameref_test.go

@@ -0,0 +1,792 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package nameref
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"sigs.k8s.io/kustomize/api/provider"
+	"sigs.k8s.io/kustomize/api/resmap"
+	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/resid"
+)
+
+func TestNamerefFilter(t *testing.T) {
+	testCases := map[string]struct {
+		referrerOriginal string
+		candidates       string
+		referrerFinal    string
+		filter           Filter
+		originalNames    []string
+	}{
+		"simple scalar": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: NotSecret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "newName2"},
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: newName
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"sequence": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+seq:
+- oldName1
+- oldName2
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: NotSecret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName1", "newName2"},
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+seq:
+- newName
+- oldName2
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "seq"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"mapping": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+map:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: NotSecret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "newName2"},
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+map:
+  name: newName
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "map"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"mapping with namespace": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+  namespace: someNs
+map:
+  name: oldName
+  namespace: someNs
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+  namespace: someNs
+---
+apiVersion: apps/v1
+kind: NotSecret
+metadata:
+  name: newName2
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: thirdName
+`,
+			originalNames: []string{"oldName", "oldName", "oldName"},
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+  namespace: someNs
+map:
+  name: newName
+  namespace: someNs
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "map"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"null value": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+map:
+  name: null
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: NotSecret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "newName2"},
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+map:
+  name: null
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "map"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			factory := provider.NewDefaultDepProvider().GetResourceFactory()
+			referrer, err := factory.FromBytes([]byte(tc.referrerOriginal))
+			if err != nil {
+				t.Fatal(err)
+			}
+			tc.filter.Referrer = referrer
+
+			resMapFactory := resmap.NewFactory(factory)
+			candidatesRes, err := factory.SliceFromBytesWithNames(
+				tc.originalNames, []byte(tc.candidates))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			candidates := resMapFactory.FromResourceSlice(candidatesRes)
+			tc.filter.ReferralCandidates = candidates
+
+			result := filtertest_test.RunFilter(t, tc.referrerOriginal, tc.filter)
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.referrerFinal),
+				strings.TrimSpace(result)) {
+				t.FailNow()
+			}
+		})
+	}
+}
+
+func TestNamerefFilterUnhappy(t *testing.T) {
+	testCases := map[string]struct {
+		referrerOriginal string
+		candidates       string
+		referrerFinal    string
+		filter           Filter
+		originalNames    []string
+	}{
+		"multiple match": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			referrerFinal: "",
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"no name": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  notName: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			referrerFinal: "",
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			factory := provider.NewDefaultDepProvider().GetResourceFactory()
+			referrer, err := factory.FromBytes([]byte(tc.referrerOriginal))
+			if err != nil {
+				t.Fatal(err)
+			}
+			tc.filter.Referrer = referrer
+
+			resMapFactory := resmap.NewFactory(factory)
+			candidatesRes, err := factory.SliceFromBytesWithNames(
+				tc.originalNames, []byte(tc.candidates))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			candidates := resMapFactory.FromResourceSlice(candidatesRes)
+			tc.filter.ReferralCandidates = candidates
+
+			_, err = filtertest_test.RunFilterE(t, tc.referrerOriginal, tc.filter)
+			if err == nil {
+				t.Fatalf("expect an error")
+			}
+			if tc.referrerFinal != "" && !assert.EqualError(t, err, tc.referrerFinal) {
+				t.FailNow()
+			}
+		})
+	}
+}
+
+func TestCandidatesWithDifferentPrefixSuffix(t *testing.T) {
+	testCases := map[string]struct {
+		referrerOriginal string
+		candidates       string
+		referrerFinal    string
+		filter           Filter
+		originalNames    []string
+		prefix           []string
+		suffix           []string
+		inputPrefix      string
+		inputSuffix      string
+		err              bool
+	}{
+		"prefix match": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"prefix1", "prefix2"},
+			suffix:        []string{"", "suffix2"},
+			inputPrefix:   "prefix1",
+			inputSuffix:   "",
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: newName
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"suffix match": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"", "prefix2"},
+			suffix:        []string{"suffix1", "suffix2"},
+			inputPrefix:   "",
+			inputSuffix:   "suffix1",
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: newName
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"prefix suffix both match": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"prefix1", "prefix2"},
+			suffix:        []string{"suffix1", "suffix2"},
+			inputPrefix:   "prefix1",
+			inputSuffix:   "suffix1",
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: newName
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"multiple match: both": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"prefix", "prefix"},
+			suffix:        []string{"suffix", "suffix"},
+			inputPrefix:   "prefix",
+			inputSuffix:   "suffix",
+			referrerFinal: "",
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: true,
+		},
+		"multiple match: only prefix": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"prefix", "prefix"},
+			suffix:        []string{"", ""},
+			inputPrefix:   "prefix",
+			inputSuffix:   "",
+			referrerFinal: "",
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: true,
+		},
+		"multiple match: only suffix": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"", ""},
+			suffix:        []string{"suffix", "suffix"},
+			inputPrefix:   "",
+			inputSuffix:   "suffix",
+			referrerFinal: "",
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: true,
+		},
+		"no match: neither match": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"prefix1", "prefix2"},
+			suffix:        []string{"suffix1", "suffix2"},
+			inputPrefix:   "prefix",
+			inputSuffix:   "suffix",
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"no match: prefix doesn't match": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"prefix1", "prefix2"},
+			suffix:        []string{"suffix", "suffix"},
+			inputPrefix:   "prefix",
+			inputSuffix:   "suffix",
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"no match: suffix doesn't match": {
+			referrerOriginal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+---
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", "oldName"},
+			prefix:        []string{"prefix", "prefix"},
+			suffix:        []string{"suffix1", "suffix2"},
+			inputPrefix:   "prefix",
+			inputSuffix:   "suffix",
+			referrerFinal: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			filter: Filter{
+				NameFieldToUpdate: types.FieldSpec{Path: "ref/name"},
+				ReferralTarget: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			factory := provider.NewDefaultDepProvider().GetResourceFactory()
+			referrer, err := factory.FromBytes([]byte(tc.referrerOriginal))
+			if err != nil {
+				t.Fatal(err)
+			}
+			if tc.inputPrefix != "" {
+				referrer.AddNamePrefix(tc.inputPrefix)
+			}
+			if tc.inputSuffix != "" {
+				referrer.AddNameSuffix(tc.inputSuffix)
+			}
+			tc.filter.Referrer = referrer
+
+			resMapFactory := resmap.NewFactory(factory)
+			candidatesRes, err := factory.SliceFromBytesWithNames(
+				tc.originalNames, []byte(tc.candidates))
+			if err != nil {
+				t.Fatal(err)
+			}
+			for i := range candidatesRes {
+				if tc.prefix[i] != "" {
+					candidatesRes[i].AddNamePrefix(tc.prefix[i])
+				}
+				if tc.suffix[i] != "" {
+					candidatesRes[i].AddNameSuffix(tc.suffix[i])
+				}
+			}
+
+			candidates := resMapFactory.FromResourceSlice(candidatesRes)
+			tc.filter.ReferralCandidates = candidates
+
+			if !tc.err {
+				if !assert.Equal(t,
+					strings.TrimSpace(tc.referrerFinal),
+					strings.TrimSpace(
+						filtertest_test.RunFilter(
+							t, tc.referrerOriginal, tc.filter))) {
+					t.FailNow()
+				}
+			} else {
+				_, err := filtertest_test.RunFilterE(
+					t, tc.referrerOriginal, tc.filter)
+				if err == nil {
+					t.Fatalf("an error is expected")
+				}
+			}
+		})
+	}
+}

api/filters/nameref/seqfilter.go

@@ -0,0 +1,60 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package nameref
+
+import (
+	"fmt"
+
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+type setFn func(*yaml.RNode) error
+
+type seqFilter struct {
+	setScalarFn  setFn
+	setMappingFn setFn
+}
+
+func (sf seqFilter) Filter(node *yaml.RNode) (*yaml.RNode, error) {
+	if yaml.IsMissingOrNull(node) {
+		return node, nil
+	}
+	switch node.YNode().Kind {
+	case yaml.ScalarNode:
+		// Kind: Role/ClusterRole
+		// FieldSpec is rules.resourceNames
+		err := sf.setScalarFn(node)
+		return node, err
+	case yaml.MappingNode:
+		// Kind: RoleBinding/ClusterRoleBinding
+		// FieldSpec is subjects
+		// Note: The corresponding fieldSpec had been changed from
+		// from path: subjects/name to just path: subjects. This is
+		// what get mutatefield to request the mapping of the whole
+		// map containing namespace and name instead of just a simple
+		// string field containing the name
+		err := sf.setMappingFn(node)
+		return node, err
+	default:
+		return node, fmt.Errorf(
+			"%#v is expected to be either a string or a map of string", node)
+	}
+}
+
+// applyFilterToSeq will apply the filter to each element in the sequence node
+func applyFilterToSeq(filter yaml.Filter, node *yaml.RNode) error {
+	if node.YNode().Kind != yaml.SequenceNode {
+		return fmt.Errorf("expect a sequence node but got %v", node.YNode().Kind)
+	}
+
+	for _, elem := range node.Content() {
+		rnode := yaml.NewRNode(elem)
+		err := rnode.PipeE(filter)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

api/filters/nameref/seqfilter_test.go

@@ -0,0 +1,83 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package nameref
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+func SeqFilter(node *yaml.RNode) (*yaml.RNode, error) {
+	if node.YNode().Value == "aaa" {
+		node.YNode().SetString("ccc")
+	}
+	return node, nil
+}
+
+func TestApplyFilterToSeq(t *testing.T) {
+	fltr := yaml.FilterFunc(SeqFilter)
+
+	testCases := map[string]struct {
+		input  string
+		expect string
+	}{
+		"replace in seq": {
+			input: `
+- aaa
+- bbb`,
+			expect: `
+- ccc
+- bbb`,
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			node, err := yaml.Parse(tc.input)
+			if err != nil {
+				t.Fatal(err)
+			}
+			err = applyFilterToSeq(fltr, node)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expect),
+				strings.TrimSpace(node.MustString())) {
+				t.Fatalf("expect:\n%s\nactual:\n%s",
+					strings.TrimSpace(tc.expect),
+					strings.TrimSpace(node.MustString()))
+			}
+		})
+	}
+}
+
+func TestApplyFilterToSeqUnhappy(t *testing.T) {
+	fltr := yaml.FilterFunc(SeqFilter)
+
+	testCases := map[string]struct {
+		input string
+	}{
+		"replace in seq": {
+			input: `
+aaa`,
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			node, err := yaml.Parse(tc.input)
+			if err != nil {
+				t.Fatal(err)
+			}
+			err = applyFilterToSeq(fltr, node)
+			if err == nil {
+				t.Fatalf("expect an error")
+			}
+		})
+	}
+}

api/filters/namespace/namespace.go

@@ -4,9 +4,12 @@
 package namespace
 
 import (
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
 	"sigs.k8s.io/kustomize/api/filters/fsslice"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/errors"
 	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/resid"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
@@ -16,9 +19,36 @@ type Filter struct {
 
 	// FsSlice contains the FieldSpecs to locate the namespace field
 	FsSlice types.FsSlice `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
+
+	// UnsetOnly means only blank namespace fields will be set
+	UnsetOnly bool `json:"unsetOnly" yaml:"unsetOnly"`
+
+	// SetRoleBindingSubjects determines which subject fields in RoleBinding and ClusterRoleBinding
+	// objects will have their namespace fields set. Overrides field specs provided for these types, if any.
+	// - defaultOnly (default): namespace will be set only on subjects named "default".
+	// - allServiceAccounts: namespace will be set on all subjects with "kind: ServiceAccount"
+	// - none: all subjects will be skipped.
+	SetRoleBindingSubjects RoleBindingSubjectMode `json:"setRoleBindingSubjects" yaml:"setRoleBindingSubjects"`
+
+	trackableSetter filtersutil.TrackableSetter
 }
 
+type RoleBindingSubjectMode string
+
+const (
+	DefaultSubjectsOnly       RoleBindingSubjectMode = "defaultOnly"
+	SubjectModeUnspecified    RoleBindingSubjectMode = ""
+	AllServiceAccountSubjects RoleBindingSubjectMode = "allServiceAccounts"
+	NoSubjects                RoleBindingSubjectMode = "none"
+)
+
 var _ kio.Filter = Filter{}
+var _ kio.TrackableFilter = &Filter{}
+
+// WithMutationTracker registers a callback which will be invoked each time a field is mutated
+func (ns *Filter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) {
+	ns.trackableSetter.WithMutationTracker(callback)
+}
 
 func (ns Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
 	return kio.FilterAll(yaml.FilterFunc(ns.run)).Filter(nodes)
@@ -26,73 +56,65 @@ func (ns Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
 
 // Run runs the filter on a single node rather than a slice
 func (ns Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
-	// hacks for hardcoded types -- :(
-	if err := ns.hacks(node); err != nil {
+	// Special handling for metadata.namespace and metadata.name -- :(
+	// never let SetEntry handle metadata.namespace--it will incorrectly include cluster-scoped resources
+	// only update metadata.name if api version is expected one--so-as it leaves other resources of kind namespace alone
+	apiVersion := node.GetApiVersion()
+	ns.FsSlice = ns.removeUnneededMetaFieldSpecs(apiVersion, ns.FsSlice)
+	gvk := resid.GvkFromNode(node)
+	if err := ns.metaNamespaceHack(node, gvk); err != nil {
 		return nil, err
 	}
 
-	// Remove the fieldspecs that are for hardcoded fields.  The fieldspecs
-	// exist for backwards compatibility with other implementations
-	// of this transformation.
-	// This implementation of the namespace transformation
-	// Does not use the fieldspecs for implementing cases which
-	// require hardcoded logic.
-	ns.FsSlice = ns.removeFieldSpecsForHacks(ns.FsSlice)
+	// Special handling for (cluster) role binding subjects -- :(
+	if isRoleBinding(gvk.Kind) {
+		ns.FsSlice = ns.removeRoleBindingSubjectFieldSpecs(ns.FsSlice)
+		if err := ns.roleBindingHack(node); err != nil {
+			return nil, err
+		}
+	}
 
 	// transformations based on data -- :)
 	err := node.PipeE(fsslice.Filter{
 		FsSlice:    ns.FsSlice,
-		SetValue:   fsslice.SetScalar(ns.Namespace),
+		SetValue:   ns.fieldSetter(),
 		CreateKind: yaml.ScalarNode, // Namespace is a ScalarNode
+		CreateTag:  yaml.NodeTagString,
 	})
-	return node, err
-}
-
-// hacks applies the namespace transforms that are hardcoded rather
-// than specified through FieldSpecs.
-func (ns Filter) hacks(obj *yaml.RNode) error {
-	meta, err := obj.GetMeta()
-	if err != nil {
-		return err
+	invalidKindErr := &yaml.InvalidNodeKindError{}
+	if err != nil && errors.As(err, &invalidKindErr) && invalidKindErr.ActualNodeKind() != yaml.ScalarNode {
+		return nil, errors.WrapPrefixf(err, "namespace field specs must target scalar nodes")
 	}
-
-	if err := ns.metaNamespaceHack(obj, meta); err != nil {
-		return err
-	}
-
-	return ns.roleBindingHack(obj, meta)
+	return node, errors.WrapPrefixf(err, "namespace transformation failed")
 }
 
 // metaNamespaceHack is a hack for implementing the namespace transform
 // for the metadata.namespace field on namespace scoped resources.
-// namespace scoped resources are determined by NOT being present
-// in a blacklist of cluster-scoped resource types (by apiVersion and kind).
-//
-// This hack should be updated to allow individual resources to specify
-// if they are cluster scoped through either an annotation on the resources,
-// or through inlined OpenAPI on the resource as a YAML comment.
-func (ns Filter) metaNamespaceHack(obj *yaml.RNode, meta yaml.ResourceMeta) error {
-	gvk := fsslice.GetGVK(meta)
-	if !gvk.IsNamespaceableKind() {
+func (ns Filter) metaNamespaceHack(obj *yaml.RNode, gvk resid.Gvk) error {
+	if gvk.IsClusterScoped() {
 		return nil
 	}
 	f := fsslice.Filter{
 		FsSlice: []types.FieldSpec{
 			{Path: types.MetadataNamespacePath, CreateIfNotPresent: true},
 		},
-		SetValue:   fsslice.SetScalar(ns.Namespace),
+		SetValue:   ns.fieldSetter(),
 		CreateKind: yaml.ScalarNode, // Namespace is a ScalarNode
 	}
 	_, err := f.Filter(obj)
 	return err
 }
 
-// roleBindingHack is a hack for implementing the namespace transform
+// roleBindingHack is a hack for implementing the transformer's SetRoleBindingSubjects option
 // for RoleBinding and ClusterRoleBinding resource types.
-// RoleBinding and ClusterRoleBinding have namespace set on
+//
+// In NoSubjects mode, it does nothing.
+//
+// In AllServiceAccountSubjects mode, it sets the namespace on subjects with "kind: ServiceAccount".
+//
+// In DefaultSubjectsOnly mode (default mode), RoleBinding and ClusterRoleBinding have namespace set on
 // elements of the "subjects" field if and only if the subject elements
 // "name" is "default".  Otherwise the namespace is not set.
-//
 // Example:
 //
 // kind: RoleBinding
@@ -101,57 +123,64 @@ func (ns Filter) metaNamespaceHack(obj *yaml.RNode, meta yaml.ResourceMeta) erro
 //   ...
 // - name: "something-else" # this will not have the namespace set
 //   ...
-func (ns Filter) roleBindingHack(obj *yaml.RNode, meta yaml.ResourceMeta) error {
-	if meta.Kind != roleBindingKind && meta.Kind != clusterRoleBindingKind {
+func (ns Filter) roleBindingHack(obj *yaml.RNode) error {
+	var visitor filtersutil.SetFn
+	switch ns.SetRoleBindingSubjects {
+	case NoSubjects:
 		return nil
+	case DefaultSubjectsOnly, SubjectModeUnspecified:
+		visitor = ns.setSubjectsNamedDefault
+	case AllServiceAccountSubjects:
+		visitor = ns.setServiceAccountNamespaces
+	default:
+		return errors.Errorf("invalid value %q for setRoleBindingSubjects: "+
+			"must be one of %q, %q or %q", ns.SetRoleBindingSubjects,
+			DefaultSubjectsOnly, NoSubjects, AllServiceAccountSubjects)
 	}
 
-	// Lookup the namespace field on all elements.
-	// We should change the fieldspec so this isn't necessary.
+	// Lookup the subjects field on all elements.
 	obj, err := obj.Pipe(yaml.Lookup(subjectsField))
-	if err != nil || yaml.IsEmpty(obj) {
+	if err != nil || yaml.IsMissingOrNull(obj) {
 		return err
 	}
-
-	// add the namespace to each "subject" with name: default
-	err = obj.VisitElements(func(o *yaml.RNode) error {
-		// copied from kunstruct based kustomize NamespaceTransformer plugin
-		// The only case we need to force the namespace
-		// if for the "service account". "default" is
-		// kind of hardcoded here for right now.
-		name, err := o.Pipe(
-			yaml.Lookup("name"), yaml.Match("default"),
-		)
-		if err != nil || yaml.IsEmpty(name) {
-			return err
-		}
-
-		// set the namespace for the default account
-		v := yaml.NewScalarRNode(ns.Namespace)
-		return o.PipeE(
-			yaml.LookupCreate(yaml.ScalarNode, "namespace"),
-			yaml.FieldSetter{Value: v},
-		)
-	})
-
-	return err
+	// Use the appropriate visitor to set the namespace field on the correct subset of subjects
+	return errors.WrapPrefixf(obj.VisitElements(visitor), "setting namespace on (cluster)role binding subjects")
 }
 
-// removeFieldSpecsForHacks removes from the list fieldspecs that
+func isRoleBinding(kind string) bool {
+	return kind == roleBindingKind || kind == clusterRoleBindingKind
+}
+
+func (ns Filter) setServiceAccountNamespaces(o *yaml.RNode) error {
+	name, err := o.Pipe(yaml.Lookup("kind"), yaml.Match("ServiceAccount"))
+	if err != nil || yaml.IsMissingOrNull(name) {
+		return errors.WrapPrefixf(err, "looking up kind on (cluster)role binding subject")
+	}
+	return setNamespaceField(o, ns.fieldSetter())
+}
+
+func (ns Filter) setSubjectsNamedDefault(o *yaml.RNode) error {
+	name, err := o.Pipe(yaml.Lookup("name"), yaml.Match("default"))
+	if err != nil || yaml.IsMissingOrNull(name) {
+		return errors.WrapPrefixf(err, "looking up name on (cluster)role binding subject")
+	}
+	return setNamespaceField(o, ns.fieldSetter())
+}
+
+func setNamespaceField(node *yaml.RNode, setter filtersutil.SetFn) error {
+	node, err := node.Pipe(yaml.LookupCreate(yaml.ScalarNode, "namespace"))
+	if err != nil {
+		return errors.WrapPrefixf(err, "setting namespace field on (cluster)role binding subject")
+	}
+	return setter(node)
+}
+
+// removeRoleBindingSubjectFieldSpecs removes from the list fieldspecs that
 // have hardcoded implementations
-func (ns Filter) removeFieldSpecsForHacks(fs types.FsSlice) types.FsSlice {
+func (ns Filter) removeRoleBindingSubjectFieldSpecs(fs types.FsSlice) types.FsSlice {
 	var val types.FsSlice
 	for i := range fs {
-		// implemented by metaNamespaceHack
-		if fs[i].Path == types.MetadataNamespacePath {
-			continue
-		}
-		// implemented by roleBindingHack
-		if fs[i].Kind == roleBindingKind && fs[i].Path == subjectsField {
-			continue
-		}
-		// implemented by roleBindingHack
-		if fs[i].Kind == clusterRoleBindingKind && fs[i].Path == subjectsField {
+		if isRoleBinding(fs[i].Kind) && fs[i].Path == subjectsNamespacePath {
 			continue
 		}
 		val = append(val, fs[i])
@@ -159,8 +188,30 @@ func (ns Filter) removeFieldSpecsForHacks(fs types.FsSlice) types.FsSlice {
 	return val
 }
 
+func (ns Filter) removeUnneededMetaFieldSpecs(apiVersion string, fs types.FsSlice) types.FsSlice {
+	var val types.FsSlice
+	for i := range fs {
+		if fs[i].Path == types.MetadataNamespacePath {
+			continue
+		}
+		if apiVersion != types.MetadataNamespaceApiVersion && fs[i].Path == types.MetadataNamePath {
+			continue
+		}
+		val = append(val, fs[i])
+	}
+	return val
+}
+
+func (ns *Filter) fieldSetter() filtersutil.SetFn {
+	if ns.UnsetOnly {
+		return ns.trackableSetter.SetEntryIfEmpty("", ns.Namespace, yaml.NodeTagString)
+	}
+	return ns.trackableSetter.SetEntry("", ns.Namespace, yaml.NodeTagString)
+}
+
 const (
 	subjectsField          = "subjects"
+	subjectsNamespacePath  = "subjects/namespace"
 	roleBindingKind        = "RoleBinding"
 	clusterRoleBindingKind = "ClusterRoleBinding"
 )

api/filters/namespace/namespace_test.go

@@ -12,8 +12,11 @@ import (
 	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
 	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
+var mutationTrackerStub = filtertest_test.MutationTrackerStub{}
+
 var tests = []TestCase{
 	{
 		name: "add",
@@ -44,6 +47,37 @@ metadata:
 		filter: namespace.Filter{Namespace: "foo"},
 	},
 
+	{
+		name: "null_ns",
+		input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  namespace: null
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  namespace: null
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  namespace: foo
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  namespace: foo
+`,
+		filter: namespace.Filter{Namespace: "foo"},
+	},
+
 	{
 		name: "add-recurse",
 		input: `
@@ -163,47 +197,47 @@ metadata:
 	{
 		name: "update-clusterrolebinding",
 		input: `
-apiVersion: example.com/v1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 subjects:
 - name: default
 ---
-apiVersion: example.com/v1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 subjects:
 - name: default
   namespace: foo
 ---
-apiVersion: example.com/v1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 subjects:
 - name: something
 ---
-apiVersion: example.com/v1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 subjects:
 - name: something
   namespace: foo
 `,
 		expected: `
-apiVersion: example.com/v1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 subjects:
 - name: default
   namespace: bar
 ---
-apiVersion: example.com/v1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 subjects:
 - name: default
   namespace: bar
 ---
-apiVersion: example.com/v1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 subjects:
 - name: something
 ---
-apiVersion: example.com/v1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 subjects:
 - name: something
@@ -252,29 +286,134 @@ a:
 			},
 		},
 	},
+
+	{
+		name: "mutation tracker",
+		input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: default
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  namespace: bar
+a:
+  b:
+    c: bar
+---
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: default
+  namespace: bar
+metadata:
+  namespace: bar
+a:
+  b:
+    c: bar
+`,
+		filter: namespace.Filter{Namespace: "bar"},
+		fsslice: []types.FieldSpec{
+			{
+				Path:               "a/b/c",
+				CreateIfNotPresent: true,
+			},
+		},
+		mutationTracker: mutationTrackerStub.MutationTracker,
+		expectedSetValueArgs: []filtertest_test.SetValueArg{
+			{
+				Value:    "bar",
+				Tag:      "!!str",
+				NodePath: []string{"metadata", "namespace"},
+			},
+			{
+				Value:    "bar",
+				Tag:      "!!str",
+				NodePath: []string{"a", "b", "c"},
+			},
+			{
+				Value:    "bar",
+				Tag:      "!!str",
+				NodePath: []string{"metadata", "namespace"},
+			},
+			{
+				Value:    "bar",
+				Tag:      "!!str",
+				NodePath: []string{"namespace"},
+			},
+			{
+				Value:    "bar",
+				Tag:      "!!str",
+				NodePath: []string{"a", "b", "c"},
+			},
+		},
+	},
+
+	{
+		name: "numeric",
+		input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  namespace: "01234"
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  namespace: "01234"
+`,
+		filter: namespace.Filter{Namespace: "01234"},
+	},
 }
 
 type TestCase struct {
-	name     string
-	input    string
-	expected string
-	filter   namespace.Filter
-	fsslice  types.FsSlice
+	name                 string
+	input                string
+	expected             string
+	filter               namespace.Filter
+	fsslice              types.FsSlice
+	mutationTracker      func(key, value, tag string, node *yaml.RNode)
+	expectedSetValueArgs []filtertest_test.SetValueArg
 }
 
 var config = builtinconfig.MakeDefaultConfig()
 
 func TestNamespace_Filter(t *testing.T) {
 	for i := range tests {
+		mutationTrackerStub.Reset()
 		test := tests[i]
+		test.filter.WithMutationTracker(test.mutationTracker)
 		t.Run(test.name, func(t *testing.T) {
-			test.filter.FsSlice = append(config.NameSpace, test.fsslice...)
+			test.filter.FsSlice = append(config.NameSpace, test.fsslice...) //nolint:gocritic
 			if !assert.Equal(t,
 				strings.TrimSpace(test.expected),
 				strings.TrimSpace(
 					filtertest_test.RunFilter(t, test.input, test.filter))) {
 				t.FailNow()
 			}
+			assert.Equal(t, test.expectedSetValueArgs, mutationTrackerStub.SetValueArgs())
 		})
 	}
 }

api/filters/patchjson6902/patchjson6902.go

@@ -6,7 +6,7 @@ package patchjson6902
 import (
 	"strings"
 
-	jsonpatch "github.com/evanphx/json-patch"
+	jsonpatch "gopkg.in/evanphx/json-patch.v4"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 	k8syaml "sigs.k8s.io/yaml"

api/filters/patchstrategicmerge/patchstrategicmerge.go

@@ -1,3 +1,6 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package patchstrategicmerge
 
 import (
@@ -12,10 +15,22 @@ type Filter struct {
 
 var _ kio.Filter = Filter{}
 
+// Filter does a strategic merge patch, which can delete nodes.
 func (pf Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
-	return kio.FilterAll(yaml.FilterFunc(pf.run)).Filter(nodes)
-}
-
-func (pf Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
-	return merge2.Merge(pf.Patch, node)
+	var result []*yaml.RNode
+	for i := range nodes {
+		r, err := merge2.Merge(
+			pf.Patch, nodes[i],
+			yaml.MergeOptions{
+				ListIncreaseDirection: yaml.MergeOptionsListPrepend,
+			},
+		)
+		if err != nil {
+			return nil, err
+		}
+		if r != nil {
+			result = append(result, r)
+		}
+	}
+	return result, nil
 }

api/filters/patchstrategicmerge/patchstrategicmerge_test.go

@@ -1,3 +1,6 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package patchstrategicmerge
 
 import (
@@ -15,6 +18,101 @@ func TestFilter(t *testing.T) {
 		patch    *yaml.RNode
 		expected string
 	}{
+		"simple": {
+			input: `apiVersion: v1
+kind: Deployment
+metadata:
+  name: clown
+spec:
+  numReplicas: 1
+`,
+			patch: yaml.MustParse(`apiVersion: v1
+kind: Deployment
+metadata:
+  name: clown
+spec:
+  numReplicas: 999
+`),
+			expected: `apiVersion: v1
+kind: Deployment
+metadata:
+  name: clown
+spec:
+  numReplicas: 999
+`,
+		},
+		"nullMapEntry1": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: my-foo
+spec:
+  bar:
+    B:
+    C: Z
+`,
+			patch: yaml.MustParse(`
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: my-foo
+spec:
+  bar:
+    C: Z
+    D: W
+  baz:
+    hello: world
+`),
+			expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: my-foo
+spec:
+  bar:
+    C: Z
+    D: W
+  baz:
+    hello: world
+`,
+		},
+		"nullMapEntry2": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: my-foo
+spec:
+  bar:
+    C: Z
+    D: W
+  baz:
+    hello: world
+`,
+			patch: yaml.MustParse(`
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: my-foo
+spec:
+  bar:
+    B:
+    C: Z
+`),
+			expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: my-foo
+spec:
+  bar:
+    C: Z
+    D: W
+  baz:
+    hello: world
+`,
+		},
 		"simple patch": {
 			input: `
 apiVersion: apps/v1
@@ -31,6 +129,86 @@ apiVersion: apps/v1
 metadata:
   name: yourDeploy
 kind: Deployment
+`,
+		},
+		"container patch": {
+			input: `
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo1
+      - name: foo2
+      - name: foo3
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo0
+`),
+			expected: `
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo0
+      - name: foo1
+      - name: foo2
+      - name: foo3
+`,
+		},
+		"volumes patch": {
+			input: `
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  template:
+    spec:
+      volumes:
+      - name: foo1
+      - name: foo2
+      - name: foo3
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  template:
+    spec:
+      volumes:
+      - name: foo0
+`),
+			expected: `
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  template:
+    spec:
+      volumes:
+      - name: foo0
+      - name: foo1
+      - name: foo2
+      - name: foo3
 `,
 		},
 		"nested patch": {
@@ -62,6 +240,669 @@ spec:
   - name: nginx
     args:
     - def
+`,
+		},
+		"remove mapping - directive": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test
+        $patch: delete   
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers: []
+`,
+		},
+		"replace mapping - directive": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      $patch: replace
+      containers:
+      - name: new
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: new
+`,
+		},
+		"merge mapping - directive": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test1
+        $patch: merge   
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test1
+`,
+		},
+		"remove list - directive": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - whatever
+      - $patch: delete
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec: {}
+`,
+		},
+		"replace list - directive": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: replace
+        image: replace
+      - $patch: replace   
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: replace
+        image: replace
+`,
+		},
+		"merge list - directive": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test
+        image: test
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test2
+        image: test2
+      - $patch: merge   
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  template:
+    spec:
+      containers:
+      - name: test2
+        image: test2
+      - name: test
+        image: test
+`,
+		},
+		"list map keys - add a port, no names": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: test-deployment
+spec:
+ template:
+   spec:
+     containers:
+     - image: test-image
+       name: test-deployment
+       ports:
+       - containerPort: 8080
+         protocol: TCP
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: test-deployment
+spec:
+ template:
+   spec:
+     containers:
+     - image: test-image
+       name: test-deployment
+       ports:
+       - containerPort: 8080
+         protocol: UDP
+       - containerPort: 80
+         protocol: UDP
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+spec:
+  template:
+    spec:
+      containers:
+      - image: test-image
+        name: test-deployment
+        ports:
+        - containerPort: 8080
+          protocol: UDP
+        - containerPort: 80
+          protocol: UDP
+        - containerPort: 8080
+          protocol: TCP
+`,
+		},
+		"list map keys - add name to port": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: test-deployment
+spec:
+ template:
+   spec:
+     containers:
+     - image: test-image
+       name: test-deployment
+       ports:
+       - containerPort: 8080
+         protocol: UDP
+       - containerPort: 8080
+         protocol: TCP
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: test-deployment
+spec:
+ template:
+   spec:
+     containers:
+     - image: test-image
+       name: test-deployment
+       ports:
+       - containerPort: 8080
+         protocol: UDP
+         name: UDP-name-patch
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+spec:
+  template:
+    spec:
+      containers:
+      - image: test-image
+        name: test-deployment
+        ports:
+        - containerPort: 8080
+          protocol: UDP
+          name: UDP-name-patch
+        - containerPort: 8080
+          protocol: TCP
+`,
+		},
+		"list map keys - replace port name": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: test-deployment
+spec:
+ template:
+   spec:
+     containers:
+     - image: test-image
+       name: test-deployment
+       ports:
+       - containerPort: 8080
+         protocol: UDP
+         name: UDP-name-original
+       - containerPort: 8080
+         protocol: TCP
+         name: TCP-name-original
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: test-deployment
+spec:
+ template:
+   spec:
+     containers:
+     - image: test-image
+       name: test-deployment
+       ports:
+       - containerPort: 8080
+         protocol: UDP
+         name: UDP-name-patch
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+spec:
+  template:
+    spec:
+      containers:
+      - image: test-image
+        name: test-deployment
+        ports:
+        - containerPort: 8080
+          protocol: UDP
+          name: UDP-name-patch
+        - containerPort: 8080
+          protocol: TCP
+          name: TCP-name-original
+`,
+		},
+		"list map keys - add a port, no protocol": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: test-deployment
+spec:
+ template:
+   spec:
+     containers:
+     - image: test-image
+       name: test-deployment
+       ports:
+       - containerPort: 8080
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: test-deployment
+spec:
+ template:
+   spec:
+     containers:
+     - image: test-image
+       name: test-deployment
+       ports:
+       - containerPort: 80
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+spec:
+  template:
+    spec:
+      containers:
+      - image: test-image
+        name: test-deployment
+        ports:
+        - containerPort: 80
+        - containerPort: 8080
+`,
+		},
+
+		// Test for issue #3513
+		// Currently broken; when one port has only containerPort, the output
+		// should not merge containerPort 8301 together
+		// This occurs because when protocol is missing on the first port,
+		// the merge code uses [containerPort] as the merge key rather than
+		// [containerPort, protocol]
+		"list map keys - protocol only present on some ports": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: consul
+        image: "dashicorp/consul:1.9.1"
+        ports:
+        - containerPort: 8500
+          name: http
+        - containerPort: 8301
+          protocol: "TCP"
+        - containerPort: 8301
+          protocol: "UDP"
+`,
+			patch: yaml.MustParse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+  labels:
+    test: label
+`),
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+  labels:
+    test: label
+spec:
+  template:
+    spec:
+      containers:
+      - name: consul
+        image: "dashicorp/consul:1.9.1"
+        ports:
+        - containerPort: 8500
+          name: http
+        - containerPort: 8301
+          protocol: "TCP"
+        - containerPort: 8301
+          protocol: "UDP"
+`,
+		},
+
+		// Issue #4628
+		"should retain existing null values in targets": {
+			input: `
+apiVersion: helm.toolkit.fluxcd.io/v2beta1
+kind: HelmRelease
+metadata:
+  name: chart
+spec:
+  releaseName: helm-chart
+  timeout: 15m
+  values:
+    chart:
+      replicaCount: null
+      autoscaling: true
+`,
+			patch: yaml.MustParse(`
+apiVersion: helm.toolkit.fluxcd.io/v2beta1
+kind: HelmRelease
+metadata:
+  name: chart
+spec:
+  releaseName: helm-chart
+  timeout: 15m
+  values:
+    deepgram-api:
+      some: value
+`),
+			expected: `
+apiVersion: helm.toolkit.fluxcd.io/v2beta1
+kind: HelmRelease
+metadata:
+  name: chart
+spec:
+  releaseName: helm-chart
+  timeout: 15m
+  values:
+    chart:
+      replicaCount: null
+      autoscaling: true
+    deepgram-api:
+      some: value
+`,
+		},
+
+		// Issue #4928
+		"support numeric keys": {
+			input: `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "foobar"
+`,
+			patch: yaml.MustParse(`
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "barfoo"
+  "9110": "foo-foo"
+`),
+			expected: `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "barfoo"
+  "9110": "foo-foo"
+`,
+		},
+
+		"honor different key style one": {
+			input: `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  '6443': "foobar"
+`,
+			patch: yaml.MustParse(`
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "barfoo"
+  9110: "foo-foo"
+`),
+			expected: `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  '6443': "barfoo"
+  9110: "foo-foo"
+`,
+		},
+
+		"honor different key style two": {
+			input: `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "foobar"
+`,
+			patch: yaml.MustParse(`
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "barfoo"
+  '9110': "foo-foo"
+`),
+			expected: `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "barfoo"
+  '9110': "foo-foo"
+`,
+		},
+
+		"different key types": {
+			input: `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "key-string-double-quoted"
+`,
+			patch: yaml.MustParse(`
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  6443: "key-int"
+`),
+			expected: `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: blabla
+  namespace: blabla-ns
+data:
+  "6443": "key-int"
 `,
 		},
 	}

api/filters/prefix/doc.go

@@ -0,0 +1,6 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package prefix contains a kio.Filter implementation of the kustomize
+// PrefixTransformer.
+package prefix

api/filters/prefix/example_test.go

@@ -1,20 +1,19 @@
 // Copyright 2020 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-package prefixsuffix_test
+package prefix_test
 
 import (
 	"bytes"
 	"log"
 	"os"
 
-	"sigs.k8s.io/kustomize/api/filters/prefixsuffix"
-	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
+	"sigs.k8s.io/kustomize/api/filters/prefix"
+	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 )
 
 func ExampleFilter() {
-	fss := builtinconfig.MakeDefaultConfig().NamePrefix
 	err := kio.Pipeline{
 		Inputs: []kio.Reader{&kio.ByteReader{Reader: bytes.NewBufferString(`
 apiVersion: example.com/v1
@@ -27,7 +26,8 @@ kind: Bar
 metadata:
   name: instance
 `)}},
-		Filters: []kio.Filter{prefixsuffix.Filter{Prefix: "baz-", FsSlice: fss}},
+		Filters: []kio.Filter{prefix.Filter{
+			Prefix: "baz-", FieldSpec: types.FieldSpec{Path: "metadata/name"}}},
 		Outputs: []kio.Writer{kio.ByteWriter{Writer: os.Stdout}},
 	}.Execute()
 	if err != nil {

api/filters/prefix/prefix.go

@@ -0,0 +1,50 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package prefix
+
+import (
+	"fmt"
+
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// Filter applies resource name prefix's using the fieldSpecs
+type Filter struct {
+	Prefix string `json:"prefix,omitempty" yaml:"prefix,omitempty"`
+
+	FieldSpec types.FieldSpec `json:"fieldSpec,omitempty" yaml:"fieldSpec,omitempty"`
+
+	trackableSetter filtersutil.TrackableSetter
+}
+
+var _ kio.Filter = Filter{}
+var _ kio.TrackableFilter = &Filter{}
+
+// WithMutationTracker registers a callback which will be invoked each time a field is mutated
+func (f *Filter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) {
+	f.trackableSetter.WithMutationTracker(callback)
+}
+
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	return kio.FilterAll(yaml.FilterFunc(f.run)).Filter(nodes)
+}
+
+func (f Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
+	err := node.PipeE(fieldspec.Filter{
+		FieldSpec:  f.FieldSpec,
+		SetValue:   f.evaluateField,
+		CreateKind: yaml.ScalarNode, // Name is a ScalarNode
+		CreateTag:  yaml.NodeTagString,
+	})
+	return node, err
+}
+
+func (f Filter) evaluateField(node *yaml.RNode) error {
+	return f.trackableSetter.SetScalar(fmt.Sprintf(
+		"%s%s", f.Prefix, node.YNode().Value))(node)
+}

api/filters/prefix/prefix_test.go

@@ -1,22 +1,23 @@
 // Copyright 2019 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-package prefixsuffix_test
+package prefix_test
 
 import (
 	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"sigs.k8s.io/kustomize/api/filters/prefixsuffix"
-	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
+	"sigs.k8s.io/kustomize/api/filters/prefix"
 	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
-var tests = []TestCase{
-	{
-		name: "prefix",
+var mutationTrackerStub = filtertest_test.MutationTrackerStub{}
+
+var tests = map[string]TestCase{
+	"prefix": {
 		input: `
 apiVersion: example.com/v1
 kind: Foo
@@ -39,65 +40,13 @@ kind: Bar
 metadata:
   name: foo-instance
 `,
-		filter: prefixsuffix.Filter{Prefix: "foo-"},
+		filter: prefix.Filter{
+			Prefix:    "foo-",
+			FieldSpec: types.FieldSpec{Path: "metadata/name"},
+		},
 	},
 
-	{
-		name: "suffix",
-		input: `
-apiVersion: example.com/v1
-kind: Foo
-metadata:
-  name: instance
----
-apiVersion: example.com/v1
-kind: Bar
-metadata:
-  name: instance
-`,
-		expected: `
-apiVersion: example.com/v1
-kind: Foo
-metadata:
-  name: instance-foo
----
-apiVersion: example.com/v1
-kind: Bar
-metadata:
-  name: instance-foo
-`,
-		filter: prefixsuffix.Filter{Suffix: "-foo"},
-	},
-
-	{
-		name: "prefix-suffix",
-		input: `
-apiVersion: example.com/v1
-kind: Foo
-metadata:
-  name: instance
----
-apiVersion: example.com/v1
-kind: Bar
-metadata:
-  name: instance
-`,
-		expected: `
-apiVersion: example.com/v1
-kind: Foo
-metadata:
-  name: bar-instance-foo
----
-apiVersion: example.com/v1
-kind: Bar
-metadata:
-  name: bar-instance-foo
-`,
-		filter: prefixsuffix.Filter{Prefix: "bar-", Suffix: "-foo"},
-	},
-
-	{
-		name: "data-fieldspecs",
+	"data-fieldspecs": {
 		input: `
 apiVersion: example.com/v1
 kind: Foo
@@ -119,7 +68,7 @@ a:
 apiVersion: example.com/v1
 kind: Foo
 metadata:
-  name: foo-instance
+  name: instance
 a:
   b:
     c: foo-d
@@ -127,41 +76,79 @@ a:
 apiVersion: example.com/v1
 kind: Bar
 metadata:
-  name: foo-instance
+  name: instance
 a:
   b:
     c: foo-d
 `,
-		filter: prefixsuffix.Filter{Prefix: "foo-"},
-		fsslice: []types.FieldSpec{
+		filter: prefix.Filter{
+			Prefix:    "foo-",
+			FieldSpec: types.FieldSpec{Path: "a/b/c"},
+		},
+	},
+
+	"mutation tracker": {
+		input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: foo-instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: foo-instance
+`,
+		filter: prefix.Filter{
+			Prefix:    "foo-",
+			FieldSpec: types.FieldSpec{Path: "metadata/name"},
+		},
+		mutationTracker: mutationTrackerStub.MutationTracker,
+		expectedSetValueArgs: []filtertest_test.SetValueArg{
 			{
-				Path: "a/b/c",
+				Value:    "foo-instance",
+				NodePath: []string{"metadata", "name"},
+			},
+			{
+				Value:    "foo-instance",
+				NodePath: []string{"metadata", "name"},
 			},
 		},
 	},
 }
 
 type TestCase struct {
-	name     string
-	input    string
-	expected string
-	filter   prefixsuffix.Filter
-	fsslice  types.FsSlice
+	input                string
+	expected             string
+	filter               prefix.Filter
+	mutationTracker      func(key, value, tag string, node *yaml.RNode)
+	expectedSetValueArgs []filtertest_test.SetValueArg
 }
 
-var config = builtinconfig.MakeDefaultConfig()
-
 func TestFilter(t *testing.T) {
-	for i := range tests {
-		test := tests[i]
-		t.Run(test.name, func(t *testing.T) {
-			test.filter.FsSlice = append(config.NamePrefix, test.fsslice...)
+	for name := range tests {
+		mutationTrackerStub.Reset()
+		test := tests[name]
+		test.filter.WithMutationTracker(test.mutationTracker)
+		t.Run(name, func(t *testing.T) {
 			if !assert.Equal(t,
 				strings.TrimSpace(test.expected),
 				strings.TrimSpace(
 					filtertest_test.RunFilter(t, test.input, test.filter))) {
 				t.FailNow()
 			}
+			assert.Equal(t, test.expectedSetValueArgs, mutationTrackerStub.SetValueArgs())
 		})
 	}
 }

api/filters/prefixsuffix/doc.go

@@ -1,6 +0,0 @@
-// Copyright 2020 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-// Package prefixsuffix contains a kio.Filter implementation of the kustomize
-// PrefixSuffixTransformer.
-package prefixsuffix

api/filters/prefixsuffix/prefixsuffix.go

@@ -1,43 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-package prefixsuffix
-
-import (
-	"fmt"
-
-	"sigs.k8s.io/kustomize/api/filters/fsslice"
-	"sigs.k8s.io/kustomize/api/types"
-	"sigs.k8s.io/kustomize/kyaml/kio"
-	"sigs.k8s.io/kustomize/kyaml/yaml"
-)
-
-// Filter applies resource name prefix's and suffix's using the fieldSpecs
-type Filter struct {
-	Prefix string `json:"prefix,omitempty" yaml:"prefix,omitempty"`
-	Suffix string `json:"suffix,omitempty" yaml:"suffix,omitempty"`
-
-	FsSlice types.FsSlice `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
-}
-
-var _ kio.Filter = Filter{}
-
-func (ns Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
-	return kio.FilterAll(yaml.FilterFunc(ns.run)).Filter(nodes)
-}
-
-// Run runs the filter on a single node rather than a slice
-func (ns Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
-	// transformations based on data -- :)
-	err := node.PipeE(fsslice.Filter{
-		FsSlice:    ns.FsSlice,
-		SetValue:   ns.set,
-		CreateKind: yaml.ScalarNode, // Name is a ScalarNode
-	})
-	return node, err
-}
-
-func (ns Filter) set(node *yaml.RNode) error {
-	return fsslice.SetScalar(fmt.Sprintf(
-		"%s%s%s", ns.Prefix, node.YNode().Value, ns.Suffix))(node)
-}

api/filters/refvar/doc.go

@@ -0,0 +1,6 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package refvar contains a kio.Filter implementation of the kustomize
+// refvar transformer (find and replace $(FOO) style variables in strings).
+package refvar

api/filters/refvar/expand.go

@@ -1,12 +1,12 @@
 // Copyright 2019 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-// Package expansion provides functions find and replace $(FOO) style variables in strings.
-package expansion
+package refvar
 
 import (
-	"bytes"
 	"fmt"
+	"log"
+	"strings"
 )
 
 const (
@@ -17,38 +17,64 @@ const (
 
 // syntaxWrap returns the input string wrapped by the expansion syntax.
 func syntaxWrap(input string) string {
-	return string(operator) + string(referenceOpener) + input + string(referenceCloser)
+	var sb strings.Builder
+	sb.WriteByte(operator)
+	sb.WriteByte(referenceOpener)
+	sb.WriteString(input)
+	sb.WriteByte(referenceCloser)
+	return sb.String()
 }
 
-// MappingFuncFor returns a mapping function for use with Expand that
-// implements the expansion semantics defined in the expansion spec; it
-// returns the input string wrapped in the expansion syntax if no mapping
-// for the input is found.
-func MappingFuncFor(
-	counts map[string]int,
-	context ...map[string]interface{}) func(string) interface{} {
-	return func(input string) interface{} {
-		for _, vars := range context {
-			val, ok := vars[input]
-			if ok {
-				counts[input]++
-				switch typedV := val.(type) {
-				case string, int64, float64, bool:
-					return typedV
-				default:
-					return syntaxWrap(input)
-				}
+// MappingFunc maps a string to anything.
+type MappingFunc func(string) interface{}
+
+// MakePrimitiveReplacer returns a MappingFunc that uses a map to do
+// replacements, and a histogram to count map hits.
+//
+// Func behavior:
+//
+// If the input key is NOT found in the map, the key is wrapped up as
+// as a variable declaration string and returned, e.g. key FOO becomes $(FOO).
+// This string is presumably put back where it was found, and might get replaced
+// later.
+//
+// If the key is found in the map, the value is returned if it is a primitive
+// type (string, bool, number), and the hit is counted.
+//
+// If it's not a primitive type (e.g. a map, struct, func, etc.) then this
+// function doesn't know what to do with it and it returns the key wrapped up
+// again as if it had not been replaced.  This should probably be an error.
+func MakePrimitiveReplacer(
+	counts map[string]int, someMap map[string]interface{}) MappingFunc {
+	return func(key string) interface{} {
+		if value, ok := someMap[key]; ok {
+			switch typedV := value.(type) {
+			case string, int, int32, int64, float32, float64, bool:
+				counts[key]++
+				return typedV
+			default:
+				// If the value is some complicated type (e.g. a map or struct),
+				// this function doesn't know how to jam it into a string,
+				// so just pretend it was a cache miss.
+				// Likely this should be an error instead of a silent failure,
+				// since the programmer passed an impossible value.
+				log.Printf(
+					"MakePrimitiveReplacer: bad replacement type=%T val=%v",
+					typedV, typedV)
+				return syntaxWrap(key)
 			}
 		}
-		return syntaxWrap(input)
+		// If unable to return the mapped variable, return it
+		// as it was found, and a later mapping might be able to
+		// replace it.
+		return syntaxWrap(key)
 	}
 }
 
-// Expand replaces variable references in the input string according to
-// the expansion spec using the given mapping function to resolve the
-// values of variables.
-func Expand(input string, mapping func(string) interface{}) interface{} {
-	var buf bytes.Buffer
+// DoReplacements replaces variable references in the input string
+// using the mapping function.
+func DoReplacements(input string, mapping MappingFunc) interface{} {
+	var buf strings.Builder
 	checkpoint := 0
 	for cursor := 0; cursor < len(input); cursor++ {
 		if input[cursor] == operator && cursor+1 < len(input) {

api/filters/refvar/expand_test.go

@@ -1,13 +1,14 @@
 // Copyright 2019 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-package expansion_test
+package refvar_test
 
 import (
 	"fmt"
 	"testing"
 
-	. "sigs.k8s.io/kustomize/api/internal/accumulator/expansion"
+	"github.com/stretchr/testify/assert"
+	. "sigs.k8s.io/kustomize/api/filters/refvar"
 )
 
 type expected struct {
@@ -15,6 +16,48 @@ type expected struct {
 	edited string
 }
 
+func TestPrimitiveReplacer(t *testing.T) {
+	varCounts := make(map[string]int)
+	f := MakePrimitiveReplacer(
+		varCounts,
+		map[string]interface{}{
+			"FOO":        "bar",
+			"ZOO":        "$(FOO)-1",
+			"BLU":        "$(ZOO)-2",
+			"EIGHT":      8,
+			"PI":         3.14159,
+			"ZINT":       "$(INT)",
+			"BOOL":       "true",
+			"HUGENUMBER": int64(9223372036854775807),
+			"CRAZYMAP":   map[string]int{"crazy": 200},
+			"ZBOOL":      "$(BOOL)",
+		})
+	assert.Equal(t, "$()", f(""))
+	assert.Equal(t, "$(      )", f("      "))
+	assert.Equal(t, "$(florida)", f("florida"))
+	assert.Equal(t, "$(0)", f("0"))
+	assert.Equal(t, "bar", f("FOO"))
+	assert.Equal(t, "bar", f("FOO"))
+	assert.Equal(t, "bar", f("FOO"))
+	assert.Equal(t, 8, f("EIGHT"))
+	assert.Equal(t, 8, f("EIGHT"))
+	assert.Equal(t, 3.14159, f("PI"))
+	assert.Equal(t, "true", f("BOOL"))
+	assert.Equal(t, int64(9223372036854775807), f("HUGENUMBER"))
+	assert.Equal(t, "$(FOO)-1", f("ZOO"))
+	assert.Equal(t, "$(CRAZYMAP)", f("CRAZYMAP"))
+	assert.Equal(t,
+		map[string]int{
+			"FOO":        3,
+			"EIGHT":      2,
+			"BOOL":       1,
+			"PI":         1,
+			"ZOO":        1,
+			"HUGENUMBER": 1,
+		},
+		varCounts)
+}
+
 func TestMapReference(t *testing.T) {
 	type env struct {
 		Name  string
@@ -51,7 +94,7 @@ func TestMapReference(t *testing.T) {
 		},
 	}
 
-	declaredEnv := map[string]interface{}{
+	varMap := map[string]interface{}{
 		"FOO":   "bar",
 		"ZOO":   "$(FOO)-1",
 		"BLU":   "$(ZOO)-2",
@@ -61,11 +104,11 @@ func TestMapReference(t *testing.T) {
 		"ZBOOL": "$(BOOL)",
 	}
 
-	counts := make(map[string]int)
-	mapping := MappingFuncFor(counts, declaredEnv)
-
+	varCounts := make(map[string]int)
 	for _, env := range envs {
-		declaredEnv[env.Name] = Expand(fmt.Sprintf("%v", env.Value), mapping)
+		varMap[env.Name] = DoReplacements(
+			fmt.Sprintf("%v", env.Value),
+			MakePrimitiveReplacer(varCounts, varMap))
 	}
 
 	expectedEnv := map[string]expected{
@@ -79,45 +122,20 @@ func TestMapReference(t *testing.T) {
 	}
 
 	for k, v := range expectedEnv {
-		if e, a := v, declaredEnv[k]; e.edited != a || e.count != counts[k] {
+		if e, a := v, varMap[k]; e.edited != a || e.count != varCounts[k] {
 			t.Errorf("Expected %v count=%d, got %v count=%d",
-				e.edited, e.count, a, counts[k])
+				e.edited, e.count, a, varCounts[k])
 		} else {
-			delete(declaredEnv, k)
+			delete(varMap, k)
 		}
 	}
 
-	if len(declaredEnv) != 0 {
-		t.Errorf("Unexpected keys in declared env: %v", declaredEnv)
+	if len(varMap) != 0 {
+		t.Errorf("Unexpected keys in declared env: %v", varMap)
 	}
 }
 
 func TestMapping(t *testing.T) {
-	context := map[string]interface{}{
-		"VAR_A":     "A",
-		"VAR_B":     "B",
-		"VAR_C":     "C",
-		"VAR_REF":   "$(VAR_A)",
-		"VAR_EMPTY": "",
-	}
-	doExpansionTest(t, context)
-}
-
-func TestMappingDual(t *testing.T) {
-	context := map[string]interface{}{
-		"VAR_A":     "A",
-		"VAR_EMPTY": "",
-	}
-	context2 := map[string]interface{}{
-		"VAR_B":   "B",
-		"VAR_C":   "C",
-		"VAR_REF": "$(VAR_A)",
-	}
-
-	doExpansionTest(t, context, context2)
-}
-
-func doExpansionTest(t *testing.T, context ...map[string]interface{}) {
 	cases := []struct {
 		name     string
 		input    string
@@ -333,11 +351,17 @@ func doExpansionTest(t *testing.T, context ...map[string]interface{}) {
 			expected: "\n",
 		},
 	}
-
 	for _, tc := range cases {
 		counts := make(map[string]int)
-		mapping := MappingFuncFor(counts, context...)
-		expanded := Expand(fmt.Sprintf("%v", tc.input), mapping)
+		expanded := DoReplacements(
+			fmt.Sprintf("%v", tc.input),
+			MakePrimitiveReplacer(counts, map[string]interface{}{
+				"VAR_A":     "A",
+				"VAR_B":     "B",
+				"VAR_C":     "C",
+				"VAR_REF":   "$(VAR_A)",
+				"VAR_EMPTY": "",
+			}))
 		if e, a := tc.expected, expanded; e != a {
 			t.Errorf("%v: expected %q, got %q", tc.name, e, a)
 		}
@@ -347,8 +371,7 @@ func doExpansionTest(t *testing.T, context ...map[string]interface{}) {
 		}
 		if len(tc.counts) > 0 {
 			for k, expectedCount := range tc.counts {
-				c, ok := counts[k]
-				if ok {
+				if c, ok := counts[k]; ok {
 					if c != expectedCount {
 						t.Errorf(
 							"%v: k=%s, expected count %d, got %d",

api/filters/refvar/refvar.go

@@ -0,0 +1,113 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package refvar
+
+import (
+	"fmt"
+	"strconv"
+
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// Filter updates $(VAR) style variables with values.
+// The fieldSpecs are the places to look for occurrences of $(VAR).
+type Filter struct {
+	MappingFunc MappingFunc     `json:"mappingFunc,omitempty" yaml:"mappingFunc,omitempty"`
+	FieldSpec   types.FieldSpec `json:"fieldSpec,omitempty" yaml:"fieldSpec,omitempty"`
+}
+
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	return kio.FilterAll(yaml.FilterFunc(f.run)).Filter(nodes)
+}
+
+func (f Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
+	err := node.PipeE(fieldspec.Filter{
+		FieldSpec: f.FieldSpec,
+		SetValue:  f.set,
+	})
+	return node, err
+}
+
+func (f Filter) set(node *yaml.RNode) error {
+	if yaml.IsMissingOrNull(node) {
+		return nil
+	}
+	switch node.YNode().Kind {
+	case yaml.ScalarNode:
+		return f.setScalar(node)
+	case yaml.MappingNode:
+		return f.setMap(node)
+	case yaml.SequenceNode:
+		return f.setSeq(node)
+	default:
+		return fmt.Errorf("invalid type encountered %v", node.YNode().Kind)
+	}
+}
+
+func updateNodeValue(node *yaml.Node, newValue interface{}) {
+	switch newValue := newValue.(type) {
+	case int:
+		node.Value = strconv.FormatInt(int64(newValue), 10)
+		node.Tag = yaml.NodeTagInt
+	case int32:
+		node.Value = strconv.FormatInt(int64(newValue), 10)
+		node.Tag = yaml.NodeTagInt
+	case int64:
+		node.Value = strconv.FormatInt(newValue, 10)
+		node.Tag = yaml.NodeTagInt
+	case bool:
+		node.SetString(strconv.FormatBool(newValue))
+		node.Tag = yaml.NodeTagBool
+	case float32:
+		node.SetString(strconv.FormatFloat(float64(newValue), 'f', -1, 32))
+		node.Tag = yaml.NodeTagFloat
+	case float64:
+		node.SetString(strconv.FormatFloat(newValue, 'f', -1, 64))
+		node.Tag = yaml.NodeTagFloat
+	default:
+		node.SetString(newValue.(string))
+		node.Tag = yaml.NodeTagString
+	}
+	node.Style = 0
+}
+
+func (f Filter) setScalar(node *yaml.RNode) error {
+	if !yaml.IsYNodeString(node.YNode()) {
+		return nil
+	}
+	v := DoReplacements(node.YNode().Value, f.MappingFunc)
+	updateNodeValue(node.YNode(), v)
+	return nil
+}
+
+func (f Filter) setMap(node *yaml.RNode) error {
+	contents := node.YNode().Content
+	for i := 0; i < len(contents); i += 2 {
+		if !yaml.IsYNodeString(contents[i]) {
+			return fmt.Errorf(
+				"invalid map key: value='%s', tag='%s'",
+				contents[i].Value, contents[i].Tag)
+		}
+		if !yaml.IsYNodeString(contents[i+1]) {
+			continue
+		}
+		newValue := DoReplacements(contents[i+1].Value, f.MappingFunc)
+		updateNodeValue(contents[i+1], newValue)
+	}
+	return nil
+}
+
+func (f Filter) setSeq(node *yaml.RNode) error {
+	for _, item := range node.YNode().Content {
+		if !yaml.IsYNodeString(item) {
+			return fmt.Errorf("invalid value type expect a string")
+		}
+		newValue := DoReplacements(item.Value, f.MappingFunc)
+		updateNodeValue(item, newValue)
+	}
+	return nil
+}

api/filters/refvar/refvar_test.go

@@ -0,0 +1,282 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package refvar_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	. "sigs.k8s.io/kustomize/api/filters/refvar"
+	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+var makeMf = func(theMap map[string]interface{}) MappingFunc {
+	ignored := make(map[string]int)
+	return MakePrimitiveReplacer(ignored, theMap)
+}
+
+func TestFilter(t *testing.T) {
+	testCases := map[string]struct {
+		input    string
+		expected string
+		filter   Filter
+	}{
+		"simple scalar": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+spec:
+  replicas: $(VAR)`,
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+spec:
+  replicas: 5`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					"VAR": int64(5),
+				}),
+				FieldSpec: types.FieldSpec{Path: "spec/replicas"},
+			},
+		},
+		"non-string scalar": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+spec:
+  replicas: 1`,
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+spec:
+  replicas: 1`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					"VAR": int64(5),
+				}),
+				FieldSpec: types.FieldSpec{Path: "spec/replicas"},
+			},
+		},
+		"wrong path": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+spec:
+  replicas: 1`,
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+spec:
+  replicas: 1`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					"VAR": int64(5),
+				}),
+				FieldSpec: types.FieldSpec{Path: "a/b/c"},
+			},
+		},
+		"sequence": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+- $(FOO)
+- $(BAR)
+- $(BAZ)
+- $(FOO)+$(BAR)
+- $(BOOL)
+- $(FLOAT)`,
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+- foo
+- bar
+- $(BAZ)
+- foo+bar
+- false
+- 1.23`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					"FOO":   "foo",
+					"BAR":   "bar",
+					"BOOL":  false,
+					"FLOAT": 1.23,
+				}),
+				FieldSpec: types.FieldSpec{Path: "data"},
+			},
+		},
+		"maps": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+  FOO: $(FOO)
+  BAR: $(BAR)
+  BAZ: $(BAZ)
+  PLUS: $(FOO)+$(BAR)`,
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+  FOO: foo
+  BAR: bar
+  BAZ: $(BAZ)
+  PLUS: foo+bar`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					"FOO": "foo",
+					"BAR": "bar",
+				}),
+				FieldSpec: types.FieldSpec{Path: "data"},
+			},
+		},
+		"complicated case": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+  slice1:
+  - $(FOO)
+  slice2:
+    FOO: $(FOO)
+    BAR: $(BAR)
+    BOOL: false
+    INT: 0
+    SLICE:
+    - $(FOO)`,
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+  slice1:
+  - $(FOO)
+  slice2:
+    FOO: foo
+    BAR: bar
+    BOOL: false
+    INT: 0
+    SLICE:
+    - $(FOO)`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					"FOO": "foo",
+					"BAR": "bar",
+				}),
+				FieldSpec: types.FieldSpec{Path: "data/slice2"},
+			},
+		},
+		"null value": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+  FOO: null`,
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+  FOO: null`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					// no replacements!
+				}),
+				FieldSpec: types.FieldSpec{Path: "data/FOO"},
+			},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expected),
+				strings.TrimSpace(
+					filtertest_test.RunFilter(t, tc.input, tc.filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}
+
+func TestFilterUnhappy(t *testing.T) {
+	testCases := map[string]struct {
+		input         string
+		expectedError string
+		filter        Filter
+	}{
+		"non-string in sequence": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+  slice:
+  - false`,
+			expectedError: `considering field 'data/slice' of object Deployment.v1.apps/dep.[noNs]: invalid value type expect a string`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					"VAR": int64(5),
+				}),
+				FieldSpec: types.FieldSpec{Path: "data/slice"},
+			},
+		},
+		"invalid key in map": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+data:
+  1: str`,
+			expectedError: `considering field 'data' of object Deployment.v1.apps/dep.[noNs]: invalid map key: value='1', tag='` + yaml.NodeTagInt + `'`,
+			filter: Filter{
+				MappingFunc: makeMf(map[string]interface{}{
+					"VAR": int64(5),
+				}),
+				FieldSpec: types.FieldSpec{Path: "data"},
+			},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			_, err := filtertest_test.RunFilterE(t, tc.input, tc.filter)
+			if !assert.EqualError(t, err, tc.expectedError) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/replacement/doc.go

@@ -0,0 +1,7 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package replacement contains a kio.Filter implementation of the kustomize
+// replacement transformer (accepts sources and looks for targets to replace
+// their values with values from the sources).
+package replacement

api/filters/replacement/example_test.go

@@ -0,0 +1,68 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package replacement
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+func ExampleFilter() {
+	f := Filter{}
+	err := yaml.Unmarshal([]byte(`
+replacements:
+- source:
+    kind: Foo2
+    fieldPath: spec.replicas
+  targets:
+  - select:
+      kind: Foo1
+    fieldPaths: 
+    - spec.replicas`), &f)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = kio.Pipeline{
+		Inputs: []kio.Reader{&kio.ByteReader{Reader: bytes.NewBufferString(`
+apiVersion: example.com/v1
+kind: Foo1
+metadata:
+  name: instance
+spec:
+  replicas: 3
+---
+apiVersion: example.com/v1
+kind: Foo2
+metadata:
+  name: instance
+spec:
+  replicas: 99
+`)}},
+		Filters: []kio.Filter{f},
+		Outputs: []kio.Writer{kio.ByteWriter{Writer: os.Stdout}},
+	}.Execute()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Output:
+	// apiVersion: example.com/v1
+	// kind: Foo1
+	// metadata:
+	//   name: instance
+	// spec:
+	//   replicas: 99
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Foo2
+	// metadata:
+	//   name: instance
+	// spec:
+	//   replicas: 99
+}

api/filters/replacement/replacement.go

@@ -0,0 +1,256 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package replacement
+
+import (
+	"fmt"
+	"strings"
+
+	"sigs.k8s.io/kustomize/api/internal/utils"
+	"sigs.k8s.io/kustomize/api/resource"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/errors"
+	"sigs.k8s.io/kustomize/kyaml/resid"
+	kyaml_utils "sigs.k8s.io/kustomize/kyaml/utils"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+type Filter struct {
+	Replacements []types.Replacement `json:"replacements,omitempty" yaml:"replacements,omitempty"`
+}
+
+// Filter replaces values of targets with values from sources
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	for i, r := range f.Replacements {
+		if (r.SourceValue == nil && r.Source == nil) || r.Targets == nil {
+			return nil, fmt.Errorf("replacements must specify a source and at least one target")
+		}
+		value, err := getReplacement(nodes, &f.Replacements[i])
+		if err != nil {
+			return nil, err
+		}
+		nodes, err = applyReplacement(nodes, value, r.Targets)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return nodes, nil
+}
+
+func getReplacement(nodes []*yaml.RNode, r *types.Replacement) (*yaml.RNode, error) {
+	if r.SourceValue != nil && r.Source != nil {
+		return nil, fmt.Errorf("value and resource selectors are mutually exclusive")
+	}
+	if r.SourceValue != nil {
+		return yaml.NewScalarRNode(*r.SourceValue), nil
+	}
+
+	source, err := selectSourceNode(nodes, r.Source)
+	if err != nil {
+		return nil, err
+	}
+
+	if r.Source.FieldPath == "" {
+		r.Source.FieldPath = types.DefaultReplacementFieldPath
+	}
+	fieldPath := kyaml_utils.SmarterPathSplitter(r.Source.FieldPath, ".")
+
+	rn, err := source.Pipe(yaml.Lookup(fieldPath...))
+	if err != nil {
+		return nil, fmt.Errorf("error looking up replacement source: %w", err)
+	}
+	if rn.IsNilOrEmpty() {
+		return nil, fmt.Errorf("fieldPath `%s` is missing for replacement source %s", r.Source.FieldPath, r.Source.ResId)
+	}
+
+	return getRefinedValue(r.Source.Options, rn)
+}
+
+// selectSourceNode finds the node that matches the selector, returning
+// an error if multiple or none are found
+func selectSourceNode(nodes []*yaml.RNode, selector *types.SourceSelector) (*yaml.RNode, error) {
+	var matches []*yaml.RNode
+	for _, n := range nodes {
+		ids, err := utils.MakeResIds(n)
+		if err != nil {
+			return nil, fmt.Errorf("error getting node IDs: %w", err)
+		}
+		for _, id := range ids {
+			if id.IsSelectedBy(selector.ResId) {
+				if len(matches) > 0 {
+					return nil, fmt.Errorf(
+						"multiple matches for selector %s", selector)
+				}
+				matches = append(matches, n)
+				break
+			}
+		}
+	}
+	if len(matches) == 0 {
+		return nil, fmt.Errorf("nothing selected by %s", selector)
+	}
+	return matches[0], nil
+}
+
+func getRefinedValue(options *types.FieldOptions, rn *yaml.RNode) (*yaml.RNode, error) {
+	if options == nil || options.Delimiter == "" {
+		return rn, nil
+	}
+	if rn.YNode().Kind != yaml.ScalarNode {
+		return nil, fmt.Errorf("delimiter option can only be used with scalar nodes")
+	}
+	value := strings.Split(yaml.GetValue(rn), options.Delimiter)
+	if options.Index >= len(value) || options.Index < 0 {
+		return nil, fmt.Errorf("options.index %d is out of bounds for value %s", options.Index, yaml.GetValue(rn))
+	}
+	n := rn.Copy()
+	n.YNode().Value = value[options.Index]
+	return n, nil
+}
+
+func applyReplacement(nodes []*yaml.RNode, value *yaml.RNode, targetSelectors []*types.TargetSelector) ([]*yaml.RNode, error) {
+	for _, selector := range targetSelectors {
+		if selector.Select == nil {
+			return nil, errors.Errorf("target must specify resources to select")
+		}
+		if len(selector.FieldPaths) == 0 {
+			selector.FieldPaths = []string{types.DefaultReplacementFieldPath}
+		}
+		for _, possibleTarget := range nodes {
+			ids, err := utils.MakeResIds(possibleTarget)
+			if err != nil {
+				return nil, err
+			}
+
+			// filter targets by label and annotation selectors
+			selectByAnnoAndLabel, err := selectByAnnoAndLabel(possibleTarget, selector)
+			if err != nil {
+				return nil, err
+			}
+			if !selectByAnnoAndLabel {
+				continue
+			}
+
+			// filter targets by matching resource IDs
+			for _, id := range ids {
+				if id.IsSelectedBy(selector.Select.ResId) && !containsRejectId(selector.Reject, ids) {
+					err := copyValueToTarget(possibleTarget, value, selector)
+					if err != nil {
+						return nil, err
+					}
+					break
+				}
+			}
+		}
+	}
+	return nodes, nil
+}
+
+func selectByAnnoAndLabel(n *yaml.RNode, t *types.TargetSelector) (bool, error) {
+	if matchesSelect, err := matchesAnnoAndLabelSelector(n, t.Select); !matchesSelect || err != nil {
+		return false, err
+	}
+	for _, reject := range t.Reject {
+		if reject.AnnotationSelector == "" && reject.LabelSelector == "" {
+			continue
+		}
+		if m, err := matchesAnnoAndLabelSelector(n, reject); m || err != nil {
+			return false, err
+		}
+	}
+	return true, nil
+}
+
+func matchesAnnoAndLabelSelector(n *yaml.RNode, selector *types.Selector) (bool, error) {
+	r := resource.Resource{RNode: *n}
+	annoMatch, err := r.MatchesAnnotationSelector(selector.AnnotationSelector)
+	if err != nil {
+		return false, err
+	}
+	labelMatch, err := r.MatchesLabelSelector(selector.LabelSelector)
+	if err != nil {
+		return false, err
+	}
+	return annoMatch && labelMatch, nil
+}
+
+func containsRejectId(rejects []*types.Selector, ids []resid.ResId) bool {
+	for _, r := range rejects {
+		if r.ResId.IsEmpty() {
+			continue
+		}
+		for _, id := range ids {
+			if id.IsSelectedBy(r.ResId) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func copyValueToTarget(target *yaml.RNode, value *yaml.RNode, selector *types.TargetSelector) error {
+	for _, fp := range selector.FieldPaths {
+		createKind := yaml.Kind(0) // do not create
+		if selector.Options != nil && selector.Options.Create {
+			createKind = value.YNode().Kind
+		}
+		targetFieldList, err := target.Pipe(&yaml.PathMatcher{
+			Path:   kyaml_utils.SmarterPathSplitter(fp, "."),
+			Create: createKind})
+		if err != nil {
+			return errors.WrapPrefixf(err, fieldRetrievalError(fp, createKind != 0)) //nolint:govet
+		}
+		targetFields, err := targetFieldList.Elements()
+		if err != nil {
+			return errors.WrapPrefixf(err, fieldRetrievalError(fp, createKind != 0)) //nolint:govet
+		}
+		if len(targetFields) == 0 {
+			return errors.Errorf(fieldRetrievalError(fp, createKind != 0)) //nolint:govet
+		}
+
+		for _, t := range targetFields {
+			if err := setFieldValue(selector.Options, t, value); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func fieldRetrievalError(fieldPath string, isCreate bool) string {
+	if isCreate {
+		return fmt.Sprintf("unable to find or create field %q in replacement target", fieldPath)
+	}
+	return fmt.Sprintf("unable to find field %q in replacement target", fieldPath)
+}
+
+func setFieldValue(options *types.FieldOptions, targetField *yaml.RNode, value *yaml.RNode) error {
+	value = value.Copy()
+	if options != nil && options.Delimiter != "" {
+		if targetField.YNode().Kind != yaml.ScalarNode {
+			return fmt.Errorf("delimiter option can only be used with scalar nodes")
+		}
+		tv := strings.Split(targetField.YNode().Value, options.Delimiter)
+		v := yaml.GetValue(value)
+		// TODO: Add a way to remove an element
+		switch {
+		case options.Index < 0: // prefix
+			tv = append([]string{v}, tv...)
+		case options.Index >= len(tv): // suffix
+			tv = append(tv, v)
+		default: // replace an element
+			tv[options.Index] = v
+		}
+		value.YNode().Value = strings.Join(tv, options.Delimiter)
+	}
+
+	if targetField.YNode().Kind == yaml.ScalarNode {
+		// For scalar, only copy the value (leave any type intact to auto-convert int->string or string->int)
+		targetField.YNode().Value = value.YNode().Value
+	} else {
+		targetField.SetYNode(value.YNode())
+	}
+
+	return nil
+}

api/filters/replicacount/example_test.go

@@ -1,3 +1,6 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package replicacount
 
 import (
@@ -33,10 +36,8 @@ spec:
 				Count: 42,
 				Name:  "instance",
 			},
-			FsSlice: types.FsSlice{
-				{
-					Path: "spec/template/replicas",
-				},
+			FieldSpec: types.FieldSpec{
+				Path: "spec/template/replicas",
 			},
 		}},
 		Outputs: []kio.Writer{kio.ByteWriter{Writer: os.Stdout}},

api/filters/replicacount/replicacount.go

@@ -1,9 +1,13 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package replicacount
 
 import (
 	"strconv"
 
-	"sigs.k8s.io/kustomize/api/filters/fsslice"
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
@@ -11,38 +15,34 @@ import (
 
 // Filter updates/sets replicas fields using the fieldSpecs
 type Filter struct {
-	Replica types.Replica `json:"replica,omitempty" yaml:"replica,omitempty"`
+	Replica   types.Replica   `json:"replica,omitempty" yaml:"replica,omitempty"`
+	FieldSpec types.FieldSpec `json:"fieldSpec,omitempty" yaml:"fieldSpec,omitempty"`
 
-	// FsSlice contains the FieldSpecs to locate the namespace field
-	FsSlice types.FsSlice `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
+	trackableSetter filtersutil.TrackableSetter
 }
 
 var _ kio.Filter = Filter{}
+var _ kio.TrackableFilter = &Filter{}
+
+// WithMutationTracker registers a callback which will be invoked each time a field is mutated
+func (rc *Filter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) {
+	rc.trackableSetter.WithMutationTracker(callback)
+}
 
 func (rc Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
 	return kio.FilterAll(yaml.FilterFunc(rc.run)).Filter(nodes)
 }
 
-// run processes each node individually.
 func (rc Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
-	meta, err := node.GetMeta()
-	if err != nil {
-		return nil, err
-	}
-
-	// only update resources where the name matches the Replica name.
-	if meta.Name != rc.Replica.Name {
-		return node, nil
-	}
-
-	err = node.PipeE(fsslice.Filter{
-		FsSlice:    rc.FsSlice,
+	err := node.PipeE(fieldspec.Filter{
+		FieldSpec:  rc.FieldSpec,
 		SetValue:   rc.set,
 		CreateKind: yaml.ScalarNode, // replicas is a ScalarNode
+		CreateTag:  yaml.NodeTagInt,
 	})
 	return node, err
 }
 
 func (rc Filter) set(node *yaml.RNode) error {
-	return fsslice.SetScalar(strconv.FormatInt(rc.Replica.Count, 10))(node)
+	return rc.trackableSetter.SetEntry("", strconv.FormatInt(rc.Replica.Count, 10), yaml.NodeTagInt)(node)
 }

api/filters/replicacount/replicacount_test.go

@@ -1,3 +1,6 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package replicacount
 
 import (
@@ -5,19 +8,19 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
 	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 func TestFilter(t *testing.T) {
-	var config = builtinconfig.MakeDefaultConfig()
-
+	mutationTrackerStub := filtertest_test.MutationTrackerStub{}
 	testCases := map[string]struct {
-		input    string
-		expected string
-		filter   Filter
-		fsslice  types.FsSlice
+		input                string
+		expected             string
+		filter               Filter
+		mutationTracker      func(key, value, tag string, node *yaml.RNode)
+		expectedSetValueArgs []filtertest_test.SetValueArg
 	}{
 		"update field": {
 			input: `
@@ -41,11 +44,7 @@ spec:
 					Name:  "dep",
 					Count: 42,
 				},
-			},
-			fsslice: types.FsSlice{
-				{
-					Path: "spec/replicas",
-				},
+				FieldSpec: types.FieldSpec{Path: "spec/replicas"},
 			},
 		},
 		"add field": {
@@ -73,9 +72,40 @@ spec:
 					Name:  "cus",
 					Count: 42,
 				},
+				FieldSpec: types.FieldSpec{
+					Path:               "spec/template/replicas",
+					CreateIfNotPresent: true,
+				},
 			},
-			fsslice: types.FsSlice{
-				{
+		},
+
+		"add_field_null": {
+			input: `
+apiVersion: custom/v1
+kind: Custom
+metadata:
+  name: cus
+spec:
+  template:
+    other: something
+    replicas: null
+`,
+			expected: `
+apiVersion: custom/v1
+kind: Custom
+metadata:
+  name: cus
+spec:
+  template:
+    other: something
+    replicas: 42
+`,
+			filter: Filter{
+				Replica: types.Replica{
+					Name:  "cus",
+					Count: 42,
+				},
+				FieldSpec: types.FieldSpec{
 					Path:               "spec/template/replicas",
 					CreateIfNotPresent: true,
 				},
@@ -105,9 +135,7 @@ spec:
 					Name:  "cus",
 					Count: 42,
 				},
-			},
-			fsslice: types.FsSlice{
-				{
+				FieldSpec: types.FieldSpec{
 					Path: "spec/template/replicas",
 				},
 			},
@@ -119,7 +147,6 @@ kind: Custom
 metadata:
   name: cus
 spec:
-  replicas: 5
   template:
     replicas: 5
 `,
@@ -129,7 +156,6 @@ kind: Custom
 metadata:
   name: cus
 spec:
-  replicas: 42
   template:
     replicas: 42
 `,
@@ -138,27 +164,55 @@ spec:
 					Name:  "cus",
 					Count: 42,
 				},
+				FieldSpec: types.FieldSpec{Path: "spec/template/replicas"},
 			},
-			fsslice: types.FsSlice{
-				{
-					Path: "spec/template/replicas",
+		},
+		"mutation tracker": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+spec:
+  replicas: 5
+`,
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+spec:
+  replicas: 42
+`,
+			filter: Filter{
+				Replica: types.Replica{
+					Name:  "dep",
+					Count: 42,
 				},
+				FieldSpec: types.FieldSpec{Path: "spec/replicas"},
+			},
+			mutationTracker: mutationTrackerStub.MutationTracker,
+			expectedSetValueArgs: []filtertest_test.SetValueArg{
 				{
-					Path: "spec/replicas",
+					Value:    "42",
+					Tag:      "!!int",
+					NodePath: []string{"spec", "replicas"},
 				},
 			},
 		},
 	}
 
 	for tn, tc := range testCases {
+		mutationTrackerStub.Reset()
+		tc.filter.WithMutationTracker(tc.mutationTracker)
 		t.Run(tn, func(t *testing.T) {
-			tc.filter.FsSlice = append(config.Replicas, tc.fsslice...)
 			if !assert.Equal(t,
 				strings.TrimSpace(tc.expected),
 				strings.TrimSpace(
 					filtertest_test.RunFilter(t, tc.input, tc.filter))) {
 				t.FailNow()
 			}
+			assert.Equal(t, tc.expectedSetValueArgs, mutationTrackerStub.SetValueArgs())
 		})
 	}
 }

api/filters/suffix/doc.go

@@ -0,0 +1,6 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package suffix contains a kio.Filter implementation of the kustomize
+// SuffixTransformer.
+package suffix

api/filters/suffix/example_test.go

@@ -0,0 +1,47 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package suffix_test
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"sigs.k8s.io/kustomize/api/filters/suffix"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+)
+
+func ExampleFilter() {
+	err := kio.Pipeline{
+		Inputs: []kio.Reader{&kio.ByteReader{Reader: bytes.NewBufferString(`
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+`)}},
+		Filters: []kio.Filter{suffix.Filter{
+			Suffix: "-baz", FieldSpec: types.FieldSpec{Path: "metadata/name"}}},
+		Outputs: []kio.Writer{kio.ByteWriter{Writer: os.Stdout}},
+	}.Execute()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Output:
+	// apiVersion: example.com/v1
+	// kind: Foo
+	// metadata:
+	//   name: instance-baz
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance-baz
+}

api/filters/suffix/suffix.go

@@ -0,0 +1,50 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package suffix
+
+import (
+	"fmt"
+
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// Filter applies resource name suffix's using the fieldSpecs
+type Filter struct {
+	Suffix string `json:"suffix,omitempty" yaml:"suffix,omitempty"`
+
+	FieldSpec types.FieldSpec `json:"fieldSpec,omitempty" yaml:"fieldSpec,omitempty"`
+
+	trackableSetter filtersutil.TrackableSetter
+}
+
+var _ kio.Filter = Filter{}
+var _ kio.TrackableFilter = &Filter{}
+
+// WithMutationTracker registers a callback which will be invoked each time a field is mutated
+func (f *Filter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) {
+	f.trackableSetter.WithMutationTracker(callback)
+}
+
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	return kio.FilterAll(yaml.FilterFunc(f.run)).Filter(nodes)
+}
+
+func (f Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
+	err := node.PipeE(fieldspec.Filter{
+		FieldSpec:  f.FieldSpec,
+		SetValue:   f.evaluateField,
+		CreateKind: yaml.ScalarNode, // Name is a ScalarNode
+		CreateTag:  yaml.NodeTagString,
+	})
+	return node, err
+}
+
+func (f Filter) evaluateField(node *yaml.RNode) error {
+	return f.trackableSetter.SetScalar(fmt.Sprintf(
+		"%s%s", node.YNode().Value, f.Suffix))(node)
+}

api/filters/suffix/suffix_test.go

@@ -0,0 +1,154 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package suffix_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"sigs.k8s.io/kustomize/api/filters/suffix"
+	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+var mutationTrackerStub = filtertest_test.MutationTrackerStub{}
+
+var tests = map[string]TestCase{
+	"suffix": {
+		input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance-foo
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance-foo
+`,
+		filter: suffix.Filter{
+			Suffix:    "-foo",
+			FieldSpec: types.FieldSpec{Path: "metadata/name"},
+		},
+	},
+
+	"data-fieldspecs": {
+		input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+a:
+  b:
+    c: d
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+a:
+  b:
+    c: d
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+a:
+  b:
+    c: d-foo
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+a:
+  b:
+    c: d-foo
+`,
+		filter: suffix.Filter{
+			Suffix:    "-foo",
+			FieldSpec: types.FieldSpec{Path: "a/b/c"},
+		},
+	},
+
+	"mutation tracker": {
+		input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance-foo
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance-foo
+`,
+		filter: suffix.Filter{
+			Suffix:    "-foo",
+			FieldSpec: types.FieldSpec{Path: "metadata/name"},
+		},
+		mutationTracker: mutationTrackerStub.MutationTracker,
+		expectedSetValueArgs: []filtertest_test.SetValueArg{
+			{
+				Value:    "instance-foo",
+				NodePath: []string{"metadata", "name"},
+			},
+			{
+				Value:    "instance-foo",
+				NodePath: []string{"metadata", "name"},
+			},
+		},
+	},
+}
+
+type TestCase struct {
+	input                string
+	expected             string
+	filter               suffix.Filter
+	mutationTracker      func(key, value, tag string, node *yaml.RNode)
+	expectedSetValueArgs []filtertest_test.SetValueArg
+}
+
+func TestFilter(t *testing.T) {
+	for name := range tests {
+		mutationTrackerStub.Reset()
+		test := tests[name]
+		test.filter.WithMutationTracker(test.mutationTracker)
+		t.Run(name, func(t *testing.T) {
+			if !assert.Equal(t,
+				strings.TrimSpace(test.expected),
+				strings.TrimSpace(
+					filtertest_test.RunFilter(t, test.input, test.filter))) {
+				t.FailNow()
+			}
+			assert.Equal(t, test.expectedSetValueArgs, mutationTrackerStub.SetValueArgs())
+		})
+	}
+}

api/filters/valueadd/valueadd.go

@@ -6,7 +6,7 @@ package valueadd
 import (
 	"strings"
 
-	"sigs.k8s.io/kustomize/api/filesys"
+	"sigs.k8s.io/kustomize/kyaml/filesys"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
@@ -98,7 +98,17 @@ var _ kio.Filter = Filter{}
 func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
 	_, err := kio.FilterAll(yaml.FilterFunc(
 		func(node *yaml.RNode) (*yaml.RNode, error) {
-			fields := strings.Split(f.FieldPath, "/")
+			var fields []string
+			// if there is forward slash '/' in the field name, a back slash '\'
+			// will be used to escape it.
+			for _, f := range strings.Split(f.FieldPath, "/") {
+				if len(fields) > 0 && strings.HasSuffix(fields[len(fields)-1], "\\") {
+					concatField := strings.TrimSuffix(fields[len(fields)-1], "\\") + "/" + f
+					fields = append(fields[:len(fields)-1], concatField)
+				} else {
+					fields = append(fields, f)
+				}
+			}
 			// TODO: support SequenceNode.
 			// Presumably here one could look for array indices (digits) at
 			// the end of the field path (as described in IETF RFC 6902 JSON),

api/filters/valueadd/valueadd_test.go

@@ -94,6 +94,20 @@ spec:
 				FilePathPosition: 2,
 			},
 		},
+		"backSlash": {
+			input: `
+kind: SomeKind
+`,
+			expectedOutput: `
+kind: SomeKind
+spec:
+  resourceRef/external: valueAdded
+`,
+			filter: Filter{
+				Value:     "valueAdded",
+				FieldPath: "spec/resourceRef\\/external",
+			},
+		},
 	}
 
 	for tn, tc := range testCases {

api/go.mod

@@ -1,21 +1,35 @@
 module sigs.k8s.io/kustomize/api
 
-go 1.13
+go 1.22.7
 
 require (
-	github.com/evanphx/json-patch v4.5.0+incompatible
-	github.com/go-openapi/spec v0.19.5
-	github.com/golangci/golangci-lint v1.21.0
-	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
-	github.com/pkg/errors v0.8.1
-	github.com/stretchr/testify v1.4.0
-	github.com/yujunz/go-getter v1.4.1-lite
-	golang.org/x/tools v0.0.0-20191010075000-0337d82405ff
-	gopkg.in/yaml.v2 v2.2.8
-	k8s.io/api v0.17.0
-	k8s.io/apimachinery v0.17.0
-	k8s.io/client-go v0.17.0
-	k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a
-	sigs.k8s.io/kustomize/kyaml v0.1.10
-	sigs.k8s.io/yaml v1.2.0
+	github.com/blang/semver/v4 v4.0.0
+	github.com/carapace-sh/carapace-shlex v1.0.1
+	github.com/go-errors/errors v1.4.2
+	github.com/stretchr/testify v1.10.0
+	go.uber.org/goleak v1.3.0
+	go.yaml.in/yaml/v2 v2.4.2
+	gopkg.in/evanphx/json-patch.v4 v4.12.0
+	k8s.io/kube-openapi v0.0.0-20241212222426-2c72e554b1e7
+	sigs.k8s.io/kustomize/kyaml v0.20.0
+	sigs.k8s.io/yaml v1.5.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/jsonreference v0.20.2 // indirect
+	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/google/gnostic-models v0.6.9 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/sergi/go-diff v1.2.0 // indirect
+	github.com/xlab/treeprint v1.2.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.3 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	google.golang.org/protobuf v1.36.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

api/go.sum

@@ -1,528 +1,89 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-github.com/360EntSecGroup-Skylar/excelize v1.4.1/go.mod h1:vnax29X2usfl7HHkBrX5EvSCJcmH3dT9luvxzu8iGAE=
-github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
-github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
-github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
-github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
-github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
-github.com/OpenPeeDeeP/depguard v1.0.1 h1:VlW4R6jmBIv3/u1JNlawEvJMM4J+dPORPaZasQee8Us=
-github.com/OpenPeeDeeP/depguard v1.0.1/go.mod h1:xsIw86fROiiwelg+jB2uM9PiKihMMmUx/1V+TNhjQvM=
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-github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
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-github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
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-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/andybalholm/cascadia v1.0.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
-github.com/bgentry/go-netrc v0.0.0-20140422174119-9fd32a8b3d3d h1:xDfNPAt8lFiC1UJrqV3uuy861HCTo708pDMbjHHdCas=
-github.com/bgentry/go-netrc v0.0.0-20140422174119-9fd32a8b3d3d/go.mod h1:6QX/PXZ00z/TKoufEY6K/a0k6AhaJrQKdFe6OfVXsa4=
-github.com/bombsimon/wsl v1.2.5 h1:9gTOkIwVtoDZywvX802SDHokeX4kW1cKnV8ZTVAPkRs=
-github.com/bombsimon/wsl v1.2.5/go.mod h1:43lEF/i0kpXbLCeDXL9LMT8c92HyBywXb0AsgMHYngM=
-github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
-github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
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-github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
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 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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-github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
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-k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
-k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a h1:UcxjrRMyNx/i/y8G7kPvLyy7rfbeuf1PYyBf973pgyU=
-k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a/go.mod h1:1TqjTSzOxsLGIKfj0lK8EeCP7K1iUG65v09OM0/WG5E=
-k8s.io/utils v0.0.0-20191114184206-e782cd3c129f/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
-mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed h1:WX1yoOaKQfddO/mLzdV4wptyWgoH/6hwLs7QHTixo0I=
-mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
-mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b h1:DxJ5nJdkhDlLok9K6qO+5290kphDJbHOQO1DFFFTeBo=
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-sigs.k8s.io/kustomize/kyaml v0.1.10/go.mod h1:mPmeBSRy0LTMv6fSrYSoi2yIFNZVouGKDsTekE5kdhs=
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-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
-sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
-sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
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+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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+k8s.io/kube-openapi v0.0.0-20241212222426-2c72e554b1e7/go.mod h1:GewRfANuJ70iYzvn+i4lezLDAFzvjxZYK1gn1lWcfas=
+sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo=
+sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0=
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+sigs.k8s.io/yaml v1.5.0/go.mod h1:wZs27Rbxoai4C0f8/9urLZtZtF3avA3gKvGyPdDqTO4=

api/hasher/hasher.go

@@ -8,6 +8,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"sort"
+
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 // SortArrayAndComputeHash sorts a string array and
@@ -18,12 +20,12 @@ func SortArrayAndComputeHash(s []string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return Encode(Hash(string(data)))
+	return encode(hex256(string(data)))
 }
 
 // Copied from https://github.com/kubernetes/kubernetes
 // /blob/master/pkg/kubectl/util/hash/hash.go
-func Encode(hex string) (string, error) {
+func encode(hex string) (string, error) {
 	if len(hex) < 10 {
 		return "", fmt.Errorf(
 			"input length must be at least 10")
@@ -46,7 +48,108 @@ func Encode(hex string) (string, error) {
 	return string(enc), nil
 }
 
-// Hash returns the hex form of the sha256 of the argument.
-func Hash(data string) string {
+// hex256 returns the hex form of the sha256 of the argument.
+func hex256(data string) string {
 	return fmt.Sprintf("%x", sha256.Sum256([]byte(data)))
 }
+
+// Hasher computes the hash of an RNode.
+type Hasher struct{}
+
+// Hash returns a hash of the argument.
+func (h *Hasher) Hash(node *yaml.RNode) (r string, err error) {
+	var encoded string
+	switch node.GetKind() {
+	case "ConfigMap":
+		encoded, err = encodeConfigMap(node)
+	case "Secret":
+		encoded, err = encodeSecret(node)
+	default:
+		var encodedBytes []byte
+		encodedBytes, err = json.Marshal(node.YNode())
+		encoded = string(encodedBytes)
+	}
+	if err != nil {
+		return "", err
+	}
+	return encode(hex256(encoded))
+}
+
+func getNodeValues(
+	node *yaml.RNode, paths []string) (map[string]interface{}, error) {
+	values := make(map[string]interface{})
+	for _, p := range paths {
+		vn, err := node.Pipe(yaml.Lookup(p))
+		if err != nil {
+			return map[string]interface{}{}, err
+		}
+		if vn == nil {
+			values[p] = ""
+			continue
+		}
+		if vn.YNode().Kind != yaml.ScalarNode {
+			vs, err := vn.MarshalJSON()
+			if err != nil {
+				return map[string]interface{}{}, err
+			}
+			// data, binaryData and stringData are all maps
+			var v map[string]interface{}
+			json.Unmarshal(vs, &v)
+			values[p] = v
+		} else {
+			values[p] = vn.YNode().Value
+		}
+	}
+	return values, nil
+}
+
+// encodeConfigMap encodes a ConfigMap.
+// Data, Kind, and Name are taken into account.
+// BinaryData is included if it's not empty to avoid useless key in output.
+func encodeConfigMap(node *yaml.RNode) (string, error) {
+	// get fields
+	paths := []string{"metadata/name", "data", "binaryData"}
+	values, err := getNodeValues(node, paths)
+	if err != nil {
+		return "", err
+	}
+	m := map[string]interface{}{
+		"kind": "ConfigMap",
+		"name": values["metadata/name"],
+		"data": values["data"],
+	}
+	if _, ok := values["binaryData"].(map[string]interface{}); ok {
+		m["binaryData"] = values["binaryData"]
+	}
+
+	// json.Marshal sorts the keys in a stable order in the encoding
+	data, err := json.Marshal(m)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+// encodeSecret encodes a Secret.
+// Data, Kind, Name, and Type are taken into account.
+// StringData is included if it's not empty to avoid useless key in output.
+func encodeSecret(node *yaml.RNode) (string, error) {
+	// get fields
+	paths := []string{"type", "metadata/name", "data", "stringData"}
+	values, err := getNodeValues(node, paths)
+	if err != nil {
+		return "", err
+	}
+	m := map[string]interface{}{"kind": "Secret", "type": values["type"],
+		"name": values["metadata/name"], "data": values["data"]}
+	if _, ok := values["stringData"].(map[string]interface{}); ok {
+		m["stringData"] = values["stringData"]
+	}
+
+	// json.Marshal sorts the keys in a stable order in the encoding
+	data, err := json.Marshal(m)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}