Merge pull request #3335 from monopole/enableKyamlByDefault

Flip default value of --enable_kyaml from false to true.

.dockerignore

@@ -0,0 +1,8 @@
+.github
+docs
+examples
+functions
+hack
+site
+travis
+*.md

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,68 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ""
+labels:
+  - kind/bug
+assignees: ""
+---
+
+<!--
+Please read this page: https://kubernetes-sigs.github.io/kustomize/contributing/bugs/ before
+filing a bug
+-->
+
+<!-- Feel free to skip the sections if they are not applicable. -->
+
+**Describe the bug**
+
+<!-- A clear and concise description of what the bug is. -->
+
+**Files that can reproduce the issue**
+
+<!--
+We cannot figure out or fix the issue if we don't know how to reproduce. 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.
+
+Example:
+
+kustomization.yaml
+
+```
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+...
+```
+
+resources.yaml
+
+```
+apiVersion: v1
+kind: Deployment
+...
+```
+
+...
+-->
+
+**Expected output**
+
+<!-- What's the expected output? -->
+
+**Actual output**
+
+<!-- What's the actual output? -->
+
+**Kustomize version**
+
+<!-- Please use the latest version when it's possible. -->
+
+**Platform**
+
+<!-- Linux/macOS/Windows? -->
+
+**Additional context**
+
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/config.yaml

@@ -0,0 +1 @@
+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,26 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ""
+labels:
+  - kind/feature
+assignees: ""
+---
+
+<!-- Feel free to skip the sections if they are not applicable. -->
+
+**Is your feature request related to a problem? Please describe.**
+
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+**Describe the solution you'd like**
+
+<!-- A clear and concise description of what you want to happen. -->
+
+**Describe alternatives you've considered**
+
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+**Additional context**
+
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,9 @@
+---
+name: Question
+about: Ask a question about the kustomize
+title: "[Question]"
+labels: ""
+assignees: ""
+---
+
+<!-- Please describe your question here -->

.github/workflows/go.yml

@@ -0,0 +1,100 @@
+name: Go
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  lint:
+    name: Lint
+    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: Lint
+      run: ./scripts/kyaml-pre-commit.sh
+      env:
+        KUSTOMIZE_DOCKER_E2E: false # don't need to do e2e tests for linting
+
+  test-linux:
+    name: Test Linux
+    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: 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: true
+
+  test-macos:
+    name: Test MacOS
+    runs-on: [macos-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: 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 not installed on mac
+
+  test-windows:
+    name: Test Windows
+    runs-on: [windows-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: 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

.gitignore

@@ -19,3 +19,5 @@
 
 # macOS
 *.DS_store
+
+.bin

.golangci-kustomize.yml

@@ -7,8 +7,13 @@ linters:
     - bodyclose
     - deadcode
     - depguard
+    # - dogsled
     - dupl
+    # - errcheck
+    # - funlen
+    # - gochecknoinits
     - goconst
+    # - gocritic
     - gocyclo
     - gofmt
     - goimports
@@ -21,6 +26,7 @@ linters:
     - lll
     - misspell
     - nakedret
+    # - scopelint
     - staticcheck
     - structcheck
     # stylecheck demands that acronyms not be treated as words
@@ -28,9 +34,10 @@ linters:
     # - stylecheck
     - typecheck
     - unconvert
-    - unused
     - unparam
+    - unused
     - varcheck
+    # - whitespace
 
 linters-settings:
   dupl:

.travis.yml

@@ -1,42 +0,0 @@
-os:
-  - linux
-  - osx
-# TODO: Speed up the slowness of the osx travis runs
-# Maybe cache brew installs?
-#
-# TODO: Uncomment when some gets the tests running on Windows.
-#  - windows
-
-addons:
-  apt:
-    packages:
-    - tree
-  homebrew:
-    packages:
-    - tree
-    update: true
-
-# Only clone the most recent commit.
-git:
-  depth: 1
-
-language: go
-
-go:
-  - "1.13"
-
-go_import_path: sigs.k8s.io/kustomize
-
-before_install:
-  - source ./travis/consider-early-travis-exit.sh
-
-# Skip the install process; let pre-commit.sh do it.
-install: true
-
-script:
-  - make verify-kustomize
-  - ./travis/kyaml-pre-commit.sh
-
-# TBD. Suppressing for now.
-notifications:
-  email: false

Makefile

@@ -6,6 +6,17 @@
 MYGOBIN := $(shell go env GOPATH)/bin
 SHELL := /bin/bash
 export PATH := $(MYGOBIN):$(PATH)
+MODULES := '"cmd/config" "api/" "kustomize/" "kyaml/"'
+
+# 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
+
+ifndef REPO_NAME
+REPO_NAME := "kustomize"
+endif
 
 .PHONY: all
 all: verify-kustomize
@@ -15,7 +26,22 @@ verify-kustomize: \
 	lint-kustomize \
 	test-unit-kustomize-all \
 	test-examples-kustomize-against-HEAD \
-	test-examples-kustomize-against-latest
+	test-examples-kustomize-against-3.8.6
+
+# 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-multi-module \
+	test-unit-kustomize-all \
+	test-unit-cmd-all \
+	test-go-mod \
+	test-examples-kustomize-against-HEAD \
+	test-examples-kustomize-against-3.8.6
+
+.PHONY: verify-kustomize-e2e
+verify-kustomize-e2e: test-examples-e2e-kustomize
 
 # Other builds in this repo might want a different linter version.
 # Without one Makefile to rule them all, the different makes
@@ -23,39 +49,45 @@ verify-kustomize: \
 # 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 api/go.mod
+# Version pinned by hack/go.mod
 $(MYGOBIN)/golangci-lint-kustomize:
 	( \
 		set -e; \
-		export GOBIN=$$(mktemp -d) \
-		cd api; \
-		GO111MODULE=on go install github.com/golangci/golangci-lint/cmd/golangci-lint; \
-		mv $$GOBIN/golangci-lint $(MYGOBIN)/golangci-lint-kustomize \
+		cd hack; \
+		GO111MODULE=on go build -tags=tools -o $(MYGOBIN)/golangci-lint-kustomize github.com/golangci/golangci-lint/cmd/golangci-lint; \
 	)
 
-# Version pinned by api/go.mod
+# Install from version specified in api/go.mod.
 $(MYGOBIN)/mdrip:
 	cd api; \
 	go install github.com/monopole/mdrip
 
-# Version pinned by api/go.mod
+# Install from version specified in api/go.mod.
 $(MYGOBIN)/stringer:
 	cd api; \
 	go install golang.org/x/tools/cmd/stringer
 
-# Version pinned by api/go.mod
+# Install from version specified in api/go.mod.
 $(MYGOBIN)/goimports:
 	cd api; \
 	go install golang.org/x/tools/cmd/goimports
 
-# To pin pluginator, use this recipe instead:
-#   cd api;
-#   go install sigs.k8s.io/kustomize/pluginator/v2
-$(MYGOBIN)/pluginator:
-	cd pluginator; \
+# Build from local source.
+$(MYGOBIN)/gorepomod:
+	cd cmd/gorepomod; \
 	go install .
 
-# Install kustomize from whatever is checked out.
+# Build from local source.
+$(MYGOBIN)/pluginator:
+	cd cmd/pluginator; \
+	go install .
+
+# Build from local source.
+$(MYGOBIN)/prchecker:
+	cd cmd/prchecker; \
+	go install .
+
+# Build from local source.
 $(MYGOBIN)/kustomize:
 	cd kustomize; \
 	go install .
@@ -64,9 +96,13 @@ $(MYGOBIN)/kustomize:
 install-tools: \
 	$(MYGOBIN)/goimports \
 	$(MYGOBIN)/golangci-lint-kustomize \
+	$(MYGOBIN)/gh \
+	$(MYGOBIN)/gorepomod \
 	$(MYGOBIN)/mdrip \
 	$(MYGOBIN)/pluginator \
-	$(MYGOBIN)/stringer
+	$(MYGOBIN)/prchecker \
+	$(MYGOBIN)/stringer \
+	$(MYGOBIN)/helm
 
 ### Begin kustomize plugin rules.
 #
@@ -99,7 +135,6 @@ _builtinplugins = \
 	ConfigMapGenerator.go \
 	HashTransformer.go \
 	ImageTagTransformer.go \
-	InventoryTransformer.go \
 	LabelTransformer.go \
 	LegacyOrderTransformer.go \
 	NamespaceTransformer.go \
@@ -108,7 +143,9 @@ _builtinplugins = \
 	PatchTransformer.go \
 	PrefixSuffixTransformer.go \
 	ReplicaCountTransformer.go \
-	SecretGenerator.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
@@ -124,7 +161,6 @@ $(pGen)/AnnotationsTransformer.go: $(pSrc)/annotationstransformer/AnnotationsTra
 $(pGen)/ConfigMapGenerator.go: $(pSrc)/configmapgenerator/ConfigMapGenerator.go
 $(pGen)/HashTransformer.go: $(pSrc)/hashtransformer/HashTransformer.go
 $(pGen)/ImageTagTransformer.go: $(pSrc)/imagetagtransformer/ImageTagTransformer.go
-$(pGen)/InventoryTransformer.go: $(pSrc)/inventorytransformer/InventoryTransformer.go
 $(pGen)/LabelTransformer.go: $(pSrc)/labeltransformer/LabelTransformer.go
 $(pGen)/LegacyOrderTransformer.go: $(pSrc)/legacyordertransformer/LegacyOrderTransformer.go
 $(pGen)/NamespaceTransformer.go: $(pSrc)/namespacetransformer/NamespaceTransformer.go
@@ -134,6 +170,8 @@ $(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: $(pSrc)/valueaddtransformer/ValueAddTransformer.go
+$(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))))))))))))))))))))))))))
@@ -152,28 +190,41 @@ $(pGen)/%.go: $(MYGOBIN)/pluginator
 .PHONY: generate-kustomize-builtin-plugins
 generate-kustomize-builtin-plugins: $(builtinplugins)
 
-.PHONY: kustomize-external-go-plugin-build
-kustomize-external-go-plugin-build:
+.PHONY: build-kustomize-external-go-plugin
+build-kustomize-external-go-plugin:
 	./hack/buildExternalGoPlugins.sh ./plugin
 
-.PHONY: kustomize-external-go-plugin-clean
-kustomize-external-go-plugin-clean:
+.PHONY: clean-kustomize-external-go-plugin
+clean-kustomize-external-go-plugin:
 	./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 ./...
+	cd api; $(MYGOBIN)/golangci-lint-kustomize \
+	  -c ../.golangci-kustomize.yml \
+	  run ./...
+	cd kustomize; $(MYGOBIN)/golangci-lint-kustomize \
+	  -c ../.golangci-kustomize.yml \
+	  run ./...
+	cd cmd/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: generate-kustomize-api
+generate-kustomize-api:
+	cd api; go generate ./...
 
 .PHONY: test-unit-kustomize-api
-test-unit-kustomize-api: $(builtinplugins)
-	cd api; go test ./...
+test-unit-kustomize-api: build-kustomize-api
+	cd api; go test ./...  -ldflags "-X sigs.k8s.io/kustomize/api/provenance.version=v444.333.222"
 
 .PHONY: test-unit-kustomize-plugins
 test-unit-kustomize-plugins:
@@ -189,18 +240,48 @@ test-unit-kustomize-all: \
 	test-unit-kustomize-cli \
 	test-unit-kustomize-plugins
 
+test-unit-cmd-all:
+	./scripts/kyaml-pre-commit.sh
+
+test-go-mod:
+	./scripts/check-go-mod.sh
+
+# Environment variables are defined at
+# https://github.com/kubernetes/test-infra/blob/master/prow/jobs.md#job-environment-variables
+.PHONY: test-multi-module
+test-multi-module: $(MYGOBIN)/prchecker
+	( \
+		export MYGOBIN=$(MYGOBIN); \
+		export REPO_OWNER=$(REPO_OWNER); \
+		export REPO_NAME=$(REPO_NAME); \
+		export PULL_NUMBER=$(PULL_NUMBER); \
+		export MODULES=$(MODULES); \
+		./scripts/check-multi-module.sh; \
+	)
+
+.PHONY:
+test-examples-e2e-kustomize: $(MYGOBIN)/mdrip $(MYGOBIN)/kind
+	( \
+		set -e; \
+		/bin/rm -f $(MYGOBIN)/kustomize; \
+		echo "Installing kustomize from ."; \
+		cd kustomize; go install .; cd ..; \
+		./hack/testExamplesE2EAgainstKustomize.sh .; \
+	)
+
 .PHONY:
 test-examples-kustomize-against-HEAD: $(MYGOBIN)/kustomize $(MYGOBIN)/mdrip
 	./hack/testExamplesAgainstKustomize.sh HEAD
 
 .PHONY:
-test-examples-kustomize-against-latest: $(MYGOBIN)/mdrip
+test-examples-kustomize-against-3.8.6: $(MYGOBIN)/mdrip
 	( \
 		set -e; \
+		tag=v3.8.6; \
 		/bin/rm -f $(MYGOBIN)/kustomize; \
-		echo "Installing kustomize from latest."; \
-		GO111MODULE=on go install sigs.k8s.io/kustomize/kustomize/v3; \
-		./hack/testExamplesAgainstKustomize.sh latest; \
+		echo "Installing kustomize $$tag."; \
+		GO111MODULE=on go get sigs.k8s.io/kustomize/kustomize/v3@$${tag}; \
+		./hack/testExamplesAgainstKustomize.sh $$tag; \
 		echo "Reinstalling kustomize from HEAD."; \
 		cd kustomize; go install .; \
 	)
@@ -222,29 +303,71 @@ $(MYGOBIN)/kubeval:
 	)
 
 # 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 binary.
-$(MYGOBIN)/helm:
+# This is for testing an example plugin that uses helm to inflate a chart
+# for subsequent kustomization.
+# Don't want to add a hard dependence in go.mod file to helm.
+# Instead, download the binaries.
+$(MYGOBIN)/helmV2:
 	( \
 		set -e; \
 		d=$(shell mktemp -d); cd $$d; \
-		wget https://storage.googleapis.com/kubernetes-helm/helm-v2.13.1-linux-amd64.tar.gz; \
-		tar -xvzf helm-v2.13.1-linux-amd64.tar.gz; \
-		mv linux-amd64/helm $(MYGOBIN); \
+		tgzFile=helm-v2.13.1-linux-amd64.tar.gz; \
+		wget https://storage.googleapis.com/kubernetes-helm/$$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 $$d; \
+		tgzFile=helm-v3.4.0-linux-amd64.tar.gz; \
+		wget https://get.helm.sh/$$tgzFile; \
+		tar -xvzf $$tgzFile; \
+		mv linux-amd64/helm $(MYGOBIN)/helmV3; \
+		rm -rf $$d \
+	)
+
+# Default version of helm is v3.
+$(MYGOBIN)/helm: $(MYGOBIN)/helmV3
+	ln -s $(MYGOBIN)/helmV3 $(MYGOBIN)/helm
+
+$(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; \
+	)
+
+# linux only.
+$(MYGOBIN)/gh:
+	( \
+		set -e; \
+		d=$(shell mktemp -d); cd $$d; \
+		tgzFile=gh_1.0.0_linux_amd64.tar.gz; \
+		wget https://github.com/cli/cli/releases/download/v1.0.0/$$tgzFile; \
+		tar -xvzf $$tgzFile; \
+		mv gh_1.0.0_linux_amd64/bin/gh  $(MYGOBIN)/gh; \
 		rm -rf $$d \
 	)
 
 .PHONY: clean
-clean: kustomize-external-go-plugin-clean
+clean: clean-kustomize-external-go-plugin
 	go clean --cache
 	rm -f $(builtinplugins)
-	rm -f $(MYGOBIN)/pluginator
 	rm -f $(MYGOBIN)/kustomize
 	rm -f $(MYGOBIN)/golangci-lint-kustomize
 
+# Handle pluginator manually.
+# rm -f $(MYGOBIN)/pluginator
+
+# Nuke the site from orbit.  It's the only way to be sure.
 .PHONY: nuke
 nuke: clean
-	sudo rm -rf $(shell go env GOPATH)/pkg/mod/sigs.k8s.io
+	go clean --modcache

OWNERS_ALIASES

@@ -9,3 +9,6 @@ aliases:
     - mengqiy
     - monopole
     - pwittrock
+    - mortent
+    - phanimarupaka
+    - Shell32-Natsu

README.md

@@ -9,30 +9,31 @@ 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://kubernetes-sigs.github.io/kustomize/installation)
+ - [General documentation](https://kubernetes-sigs.github.io/kustomize)
+ - [Examples](examples)
 
-[![Build Status](https://travis-ci.org/kubernetes-sigs/kustomize.svg?branch=master)](https://travis-ci.org/kubernetes-sigs/kustomize)
+[![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.
+The kustomize build flow at [v2.0.3] was added
+to [kubectl v1.14][kubectl announcement].  The kustomize
+flow in kubectl has remained frozen at v2.0.3 while work
+to extract kubectl from the k/k repo, and work to remove
+kustomize's dependence on core k/k code ([#2506]) has proceeded.
+The reintegration effort is tracked in [#1500] (and its blocking
+issues).
 
-| 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) |
+[v2.0.3]: /../../tree/v2.0.3
+[#2506]: https://github.com/kubernetes-sigs/kustomize/issues/2506
+[#1500]: https://github.com/kubernetes-sigs/kustomize/issues/1500
 
-For examples and guides for using the kubectl integration please see the [kubectl book] or the [kubernetes documentation].
+For examples and guides for using the kubectl integration please
+see the [kubectl book] or the [kubernetes documentation].
 
 ## Usage
 
@@ -107,7 +108,7 @@ Take the work from step (1) above, move it into a
 `someApp` subdirectory called `base`, then
 place overlays in a sibling directory.
 
-An overlay is just another kustomization, refering to
+An overlay is just another kustomization, referring to
 the base, and referring to patches to apply to that
 base.
 
@@ -133,20 +134,8 @@ 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://kubernetes-sigs.github.io/kustomize/contributing/bugs/) instructions
+- [contribute a feature](https://kubernetes-sigs.github.io/kustomize/contributing/features/) instructions
 
 ### Code of conduct
 
@@ -155,32 +144,27 @@ 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
+[DAM]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#declarative-application-management
 [KEP]: https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/0008-kustomize.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
+[applied]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#apply
+[base]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#base
+[declarative configuration]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#declarative-application-management
 [imageBase]: docs/images/base.jpg
 [imageOverlay]: docs/images/overlay.jpg
-[kind/feature]: /../../labels/kind%2Ffeature
 [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
+[kubectl book]: https://kubectl.docs.kubernetes.io/guides/introduction/kustomize/
 [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://kubernetes-sigs.github.io/kustomize/api-reference/glossary#kubernetes-style-object
+[kustomization]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#kustomization
+[overlay]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#overlay
+[overlays]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#overlay
+[release page]: https://github.com/kubernetes-sigs/kustomize/releases
+[resource]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#resource
+[resources]: https://kubernetes-sigs.github.io/kustomize/api-reference/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
+[variant]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#variant
+[variants]: https://kubernetes-sigs.github.io/kustomize/api-reference/glossary#variant
+[v2.0.3]: https://github.com/kubernetes-sigs/kustomize/releases/tag/v2.0.3
+[v2.1.0]: https://github.com/kubernetes-sigs/kustomize/releases/tag/v2.1.0
+[workflows]: https://kubernetes-sigs.github.io/kustomize/guides

api/builtins/AnnotationsTransformer.go

@@ -4,9 +4,10 @@
 package builtins
 
 import (
+	"sigs.k8s.io/kustomize/api/filters/annotations"
 	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/transform"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 	"sigs.k8s.io/yaml"
 )
 
@@ -24,14 +25,16 @@ func (p *AnnotationsTransformerPlugin) Config(
 }
 
 func (p *AnnotationsTransformerPlugin) Transform(m resmap.ResMap) error {
-	t, err := transform.NewMapTransformer(
-		p.FieldSpecs,
-		p.Annotations,
-	)
-	if err != nil {
-		return err
+	for _, r := range m.Resources() {
+		err := filtersutil.ApplyToJSON(annotations.Filter{
+			Annotations: p.Annotations,
+			FsSlice:     p.FieldSpecs,
+		}, r)
+		if err != nil {
+			return err
+		}
 	}
-	return t.Transform(m)
+	return nil
 }
 
 func NewAnnotationsTransformerPlugin() resmap.TransformerPlugin {

api/builtins/ConfigMapGenerator.go

@@ -13,13 +13,10 @@ import (
 type ConfigMapGeneratorPlugin struct {
 	h                *resmap.PluginHelpers
 	types.ObjectMeta `json:"metadata,omitempty" yaml:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
-	types.GeneratorOptions
 	types.ConfigMapArgs
 }
 
-func (p *ConfigMapGeneratorPlugin) Config(
-	h *resmap.PluginHelpers, config []byte) (err error) {
-	p.GeneratorOptions = types.GeneratorOptions{}
+func (p *ConfigMapGeneratorPlugin) Config(h *resmap.PluginHelpers, config []byte) (err error) {
 	p.ConfigMapArgs = types.ConfigMapArgs{}
 	err = yaml.Unmarshal(config, p)
 	if p.ConfigMapArgs.Name == "" {
@@ -34,8 +31,7 @@ func (p *ConfigMapGeneratorPlugin) Config(
 
 func (p *ConfigMapGeneratorPlugin) Generate() (resmap.ResMap, error) {
 	return p.h.ResmapFactory().FromConfigMapArgs(
-		kv.NewLoader(p.h.Loader(), p.h.Validator()),
-		&p.GeneratorOptions, p.ConfigMapArgs)
+		kv.NewLoader(p.h.Loader(), p.h.Validator()), p.ConfigMapArgs)
 }
 
 func NewConfigMapGeneratorPlugin() resmap.GeneratorPlugin {

api/builtins/HelmChartInflationGenerator.go

@@ -0,0 +1,179 @@
+// Code generated by pluginator on HelmChartInflationGenerator; DO NOT EDIT.
+// pluginator {unknown  1970-01-01T00:00:00Z  }
+
+package builtins
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"os/exec"
+	"path"
+	"regexp"
+	"strings"
+
+	"github.com/pkg/errors"
+	"sigs.k8s.io/kustomize/api/filesys"
+	"sigs.k8s.io/kustomize/api/resmap"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/yaml"
+)
+
+// HelmChartInflationGeneratorPlugin is a plugin to generate resources
+// from a remote or local helm chart.
+type HelmChartInflationGeneratorPlugin struct {
+	h                *resmap.PluginHelpers
+	types.ObjectMeta `json:"metadata,omitempty" yaml:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
+	runHelmCommand   func([]string) ([]byte, error)
+	types.HelmChartArgs
+	tmpDir string
+}
+
+var KustomizePlugin HelmChartInflationGeneratorPlugin
+
+// Config uses the input plugin configurations `config` to setup the generator
+// options
+func (p *HelmChartInflationGeneratorPlugin) Config(h *resmap.PluginHelpers, config []byte) error {
+	p.h = h
+	err := yaml.Unmarshal(config, p)
+	if err != nil {
+		return err
+	}
+	tmpDir, err := filesys.NewTmpConfirmedDir()
+	if err != nil {
+		return err
+	}
+	p.tmpDir = string(tmpDir)
+	if p.ChartName == "" {
+		return fmt.Errorf("chartName cannot be empty")
+	}
+	if p.ChartHome == "" {
+		p.ChartHome = path.Join(p.tmpDir, "chart")
+	}
+	if p.ChartRepoName == "" {
+		p.ChartRepoName = "stable"
+	}
+	if p.HelmBin == "" {
+		p.HelmBin = "helm"
+	}
+	if p.HelmHome == "" {
+		p.HelmHome = path.Join(p.tmpDir, ".helm")
+	}
+	if p.Values == "" {
+		p.Values = path.Join(p.ChartHome, p.ChartName, "values.yaml")
+	}
+	// runHelmCommand will run `helm` command with args provided. Return stdout
+	// and error if there is any.
+	p.runHelmCommand = func(args []string) ([]byte, error) {
+		stdout := new(bytes.Buffer)
+		stderr := new(bytes.Buffer)
+		cmd := exec.Command(p.HelmBin, args...)
+		cmd.Stdout = stdout
+		cmd.Stderr = stderr
+		cmd.Env = append(cmd.Env,
+			fmt.Sprintf("HELM_CONFIG_HOME=%s", p.HelmHome),
+			fmt.Sprintf("HELM_CACHE_HOME=%s/.cache", p.HelmHome),
+			fmt.Sprintf("HELM_DATA_HOME=%s/.data", p.HelmHome),
+		)
+		err := cmd.Run()
+		if err != nil {
+			return stdout.Bytes(),
+				errors.Wrap(
+					fmt.Errorf("failed to run command %s %s", p.HelmBin, strings.Join(args, " ")),
+					stderr.String(),
+				)
+		}
+		return stdout.Bytes(), nil
+	}
+	return nil
+}
+
+// Generate implements generator
+func (p *HelmChartInflationGeneratorPlugin) Generate() (resmap.ResMap, error) {
+	// cleanup
+	defer os.RemoveAll(p.tmpDir)
+	// check helm version. we only support V3
+	err := p.checkHelmVersion()
+	if err != nil {
+		return nil, err
+	}
+	// pull the chart
+	if !p.checkLocalChart() {
+		_, err := p.runHelmCommand(p.getPullCommandArgs())
+		if err != nil {
+			return nil, err
+		}
+	}
+	// render the charts
+	stdout, err := p.runHelmCommand(p.getTemplateCommandArgs())
+	if err != nil {
+		return nil, err
+	}
+
+	return p.h.ResmapFactory().NewResMapFromBytes(stdout)
+}
+
+func (p *HelmChartInflationGeneratorPlugin) getTemplateCommandArgs() []string {
+	args := []string{"template"}
+	if p.ReleaseName != "" {
+		args = append(args, p.ReleaseName)
+	}
+	args = append(args, path.Join(p.ChartHome, p.ChartName))
+	if p.ReleaseNamespace != "" {
+		args = append(args, "--namespace", p.ReleaseNamespace)
+	}
+	if p.Values != "" {
+		args = append(args, "--values", p.Values)
+	}
+	args = append(args, p.ExtraArgs...)
+	return args
+}
+
+func (p *HelmChartInflationGeneratorPlugin) getPullCommandArgs() []string {
+	args := []string{"pull", "--untar", "--untardir", p.ChartHome}
+	chartName := fmt.Sprintf("%s/%s", p.ChartRepoName, p.ChartName)
+	if p.ChartVersion != "" {
+		args = append(args, "--version", p.ChartVersion)
+	}
+	if p.ChartRepoURL != "" {
+		args = append(args, "--repo", p.ChartRepoURL)
+		chartName = p.ChartName
+	}
+
+	args = append(args, chartName)
+
+	return args
+}
+
+// checkLocalChart will return true if the chart does exist in
+// local chart home.
+func (p *HelmChartInflationGeneratorPlugin) checkLocalChart() bool {
+	path := path.Join(p.ChartHome, p.ChartName)
+	s, err := os.Stat(path)
+	if err != nil {
+		return false
+	}
+	return s.IsDir()
+}
+
+// checkHelmVersion will return an error if the helm version is not V3
+func (p *HelmChartInflationGeneratorPlugin) checkHelmVersion() error {
+	stdout, err := p.runHelmCommand([]string{"version", "-c", "--short"})
+	if err != nil {
+		return err
+	}
+	r, err := regexp.Compile(`v\d+(\.\d+)+`)
+	if err != nil {
+		return err
+	}
+	v := string(r.Find(stdout))[1:]
+	majorVersion := strings.Split(v, ".")[0]
+	if majorVersion != "3" {
+		return fmt.Errorf("this plugin requires helm V3 but got v%s", v)
+	}
+	return nil
+}
+
+func NewHelmChartInflationGeneratorPlugin() resmap.GeneratorPlugin {
+	return &HelmChartInflationGeneratorPlugin{}
+}

api/builtins/ImageTagTransformer.go

@@ -8,10 +8,10 @@ import (
 	"regexp"
 	"strings"
 
-	"sigs.k8s.io/kustomize/api/transform"
-	"sigs.k8s.io/kustomize/api/types"
-
+	"sigs.k8s.io/kustomize/api/filters/imagetag"
 	"sigs.k8s.io/kustomize/api/resmap"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 	"sigs.k8s.io/yaml"
 )
 
@@ -31,18 +31,19 @@ func (p *ImageTagTransformerPlugin) Config(
 
 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
-			}
+		// traverse all fields at first
+		err := filtersutil.ApplyToJSON(imagetag.LegacyFilter{
+			ImageTag: p.ImageTag,
+		}, r)
+		if err != nil {
+			return err
 		}
-		// Kept for backward compatibility
-		if err := p.findAndReplaceImage(r.Map()); err != nil && r.OrgId().Kind != `CustomResourceDefinition` {
+		// then use user specified field specs
+		err = filtersutil.ApplyToJSON(imagetag.Filter{
+			ImageTag: p.ImageTag,
+			FsSlice:  p.FieldSpecs,
+		}, r)
+		if err != nil {
 			return err
 		}
 	}
@@ -144,8 +145,10 @@ func (p *ImageTagTransformerPlugin) findContainers(obj map[string]interface{}) e
 }
 
 func isImageMatched(s, t string) bool {
-	// Tag values are limited to [a-zA-Z0-9_.-].
-	pattern, _ := regexp.Compile("^" + t + "(@sha256)?(:[a-zA-Z0-9_.-]*)?$")
+	// Tag values are limited to [a-zA-Z0-9_.{}-].
+	// Some tools like Bazel rules_k8s allow tag patterns with {} characters.
+	// More info: https://github.com/bazelbuild/rules_k8s/pull/423
+	pattern, _ := regexp.Compile("^" + t + "(@sha256)?(:[a-zA-Z0-9_.{}-]*)?$")
 	return pattern.MatchString(s)
 }
 

api/builtins/InventoryTransformer.go

@@ -1,128 +0,0 @@
-// Code generated by pluginator on InventoryTransformer; DO NOT EDIT.
-// pluginator {unknown  1970-01-01T00:00:00Z  }
-
-package builtins
-
-import (
-	"fmt"
-
-	"sigs.k8s.io/kustomize/api/hasher"
-	"sigs.k8s.io/kustomize/api/inventory"
-	"sigs.k8s.io/kustomize/api/kv"
-	"sigs.k8s.io/kustomize/api/resid"
-	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
-	"sigs.k8s.io/kustomize/api/types"
-	"sigs.k8s.io/yaml"
-)
-
-type InventoryTransformerPlugin struct {
-	h                *resmap.PluginHelpers
-	types.ObjectMeta `json:"metadata,omitempty" yaml:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
-	Policy           string `json:"policy,omitempty" yaml:"policy,omitempty"`
-}
-
-func (p *InventoryTransformerPlugin) Config(
-	h *resmap.PluginHelpers, c []byte) (err error) {
-	p.h = h
-	err = yaml.Unmarshal(c, p)
-	if err != nil {
-		return err
-	}
-	if p.Policy == "" {
-		p.Policy = types.GarbageIgnore.String()
-	}
-	if p.Policy != types.GarbageCollect.String() &&
-		p.Policy != types.GarbageIgnore.String() {
-		return fmt.Errorf(
-			"unrecognized garbagePolicy '%s'", p.Policy)
-	}
-	return nil
-}
-
-// Transform generates an inventory object from the input ResMap.
-// This ConfigMap supports the pruning command in
-// the client side tool proposed here:
-// https://github.com/kubernetes/enhancements/pull/810
-//
-// The inventory data is written to the ConfigMap's
-// annotations, rather than to the key-value pairs in
-// the ConfigMap's data field, since
-//   1. Keys in a ConfigMap's data field are too
-//      constrained for this purpose.
-//   2. Using annotations allow any object to be used,
-//      not just a ConfigMap, should some other object
-//      (e.g. some App object) become more desirable
-//      for this purpose.
-func (p *InventoryTransformerPlugin) Transform(m resmap.ResMap) error {
-
-	inv, h, err := makeInventory(m)
-	if err != nil {
-		return err
-	}
-
-	args := types.ConfigMapArgs{}
-	args.Name = p.Name
-	args.Namespace = p.Namespace
-	opts := &types.GeneratorOptions{
-		Annotations: make(map[string]string),
-	}
-	opts.Annotations[inventory.HashAnnotation] = h
-	err = inv.UpdateAnnotations(opts.Annotations)
-	if err != nil {
-		return err
-	}
-
-	cm, err := p.h.ResmapFactory().RF().MakeConfigMap(
-		kv.NewLoader(p.h.Loader(), p.h.Validator()), opts, &args)
-	if err != nil {
-		return err
-	}
-
-	if p.Policy == types.GarbageCollect.String() {
-		for _, byeBye := range m.AllIds() {
-			m.Remove(byeBye)
-		}
-	}
-	return m.Append(cm)
-}
-
-func makeInventory(m resmap.ResMap) (
-	inv *inventory.Inventory, hash string, err error) {
-	inv = inventory.NewInventory()
-	var keys []string
-	for _, r := range m.Resources() {
-		ns := r.GetNamespace()
-		item := resid.NewResIdWithNamespace(r.GetGvk(), r.GetName(), ns)
-		if _, ok := inv.Current[item]; ok {
-			return nil, "", fmt.Errorf(
-				"item '%v' already in inventory", item)
-		}
-		inv.Current[item], err = computeRefs(r, m)
-		if err != nil {
-			return nil, "", err
-		}
-		keys = append(keys, item.String())
-	}
-	h, err := hasher.SortArrayAndComputeHash(keys)
-	return inv, h, err
-}
-
-func computeRefs(
-	r *resource.Resource, m resmap.ResMap) (refs []resid.ResId, err error) {
-	for _, refid := range r.GetRefBy() {
-		ref, err := m.GetByCurrentId(refid)
-		if err != nil {
-			return nil, err
-		}
-		refs = append(
-			refs,
-			resid.NewResIdWithNamespace(
-				ref.GetGvk(), ref.GetName(), ref.GetNamespace()))
-	}
-	return
-}
-
-func NewInventoryTransformerPlugin() resmap.TransformerPlugin {
-	return &InventoryTransformerPlugin{}
-}

api/builtins/LabelTransformer.go

@@ -4,9 +4,10 @@
 package builtins
 
 import (
+	"sigs.k8s.io/kustomize/api/filters/labels"
 	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/transform"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 	"sigs.k8s.io/yaml"
 )
 
@@ -24,14 +25,16 @@ func (p *LabelTransformerPlugin) Config(
 }
 
 func (p *LabelTransformerPlugin) Transform(m resmap.ResMap) error {
-	t, err := transform.NewMapTransformer(
-		p.FieldSpecs,
-		p.Labels,
-	)
-	if err != nil {
-		return err
+	for _, r := range m.Resources() {
+		err := filtersutil.ApplyToJSON(labels.Filter{
+			Labels:  p.Labels,
+			FsSlice: p.FieldSpecs,
+		}, r)
+		if err != nil {
+			return err
+		}
 	}
-	return t.Transform(m)
+	return nil
 }
 
 func NewLabelTransformerPlugin() resmap.TransformerPlugin {

api/builtins/NamespaceTransformer.go

@@ -6,12 +6,10 @@ package builtins
 import (
 	"fmt"
 
-	"sigs.k8s.io/kustomize/api/transform"
-
-	"sigs.k8s.io/kustomize/api/resid"
+	"sigs.k8s.io/kustomize/api/filters/namespace"
 	"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"
 )
 
@@ -33,99 +31,26 @@ func (p *NamespaceTransformerPlugin) Transform(m resmap.ResMap) error {
 		return nil
 	}
 	for _, r := range m.Resources() {
-		if len(r.Map()) == 0 {
+		if r.IsEmpty() {
 			// Don't mutate empty objects?
 			continue
 		}
-
-		id := r.OrgId()
-		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
-			}
+		err := filtersutil.ApplyToJSON(namespace.Filter{
+			Namespace: p.Namespace,
+			FsSlice:   p.FieldSpecs,
+		}, r)
+		if err != nil {
+			return err
 		}
-
 		matches := m.GetMatchingResourcesByCurrentId(r.CurId().Equals)
 		if len(matches) != 1 {
-			return fmt.Errorf("namespace tranformation produces ID conflict: %#v", matches)
+			return fmt.Errorf(
+				"namespace transformation produces ID conflict: %+v", matches)
 		}
 	}
 	return nil
 }
 
-const metaNamespace = "metadata/namespace"
-
-// 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 != metaNamespace || (fs.Path == metaNamespace && 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/PatchJson6902Transformer.go

@@ -8,19 +8,20 @@ import (
 
 	jsonpatch "github.com/evanphx/json-patch"
 	"github.com/pkg/errors"
+	"sigs.k8s.io/kustomize/api/filters/patchjson6902"
 	"sigs.k8s.io/kustomize/api/ifc"
-	"sigs.k8s.io/kustomize/api/resid"
 	"sigs.k8s.io/kustomize/api/resmap"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 	"sigs.k8s.io/yaml"
 )
 
 type PatchJson6902TransformerPlugin struct {
 	ldr          ifc.Loader
 	decodedPatch jsonpatch.Patch
-	Target       types.PatchTarget `json:"target,omitempty" yaml:"target,omitempty"`
-	Path         string            `json:"path,omitempty" yaml:"path,omitempty"`
-	JsonOp       string            `json:"jsonOp,omitempty" yaml:"jsonOp,omitempty"`
+	Target       *types.Selector `json:"target,omitempty" yaml:"target,omitempty"`
+	Path         string          `json:"path,omitempty" yaml:"path,omitempty"`
+	JsonOp       string          `json:"jsonOp,omitempty" yaml:"jsonOp,omitempty"`
 }
 
 func (p *PatchJson6902TransformerPlugin) Config(
@@ -70,29 +71,22 @@ func (p *PatchJson6902TransformerPlugin) Config(
 }
 
 func (p *PatchJson6902TransformerPlugin) Transform(m resmap.ResMap) error {
-	id := resid.NewResIdWithNamespace(
-		resid.Gvk{
-			Group:   p.Target.Group,
-			Version: p.Target.Version,
-			Kind:    p.Target.Kind,
-		},
-		p.Target.Name,
-		p.Target.Namespace,
-	)
-	obj, err := m.GetById(id)
+	if p.Target == nil {
+		return fmt.Errorf("must specify a target for patch %s", p.JsonOp)
+	}
+	resources, err := m.Select(*p.Target)
 	if err != nil {
 		return err
 	}
-	rawObj, err := obj.MarshalJSON()
-	if err != nil {
-		return err
+	for _, res := range resources {
+		err = filtersutil.ApplyToJSON(patchjson6902.Filter{
+			Patch: p.JsonOp,
+		}, res)
+		if err != nil {
+			return err
+		}
 	}
-	modifiedObj, err := p.decodedPatch.Apply(rawObj)
-	if err != nil {
-		return errors.Wrapf(
-			err, "failed to apply json patch '%s'", p.JsonOp)
-	}
-	return obj.UnmarshalJSON(modifiedObj)
+	return nil
 }
 
 func NewPatchJson6902TransformerPlugin() resmap.TransformerPlugin {

api/builtins/PatchStrategicMergeTransformer.go

@@ -31,6 +31,11 @@ func (p *PatchStrategicMergeTransformerPlugin) Config(
 	}
 	if len(p.Paths) != 0 {
 		for _, onePath := range p.Paths {
+			// The following oddly attempts to interpret a path string as an
+			// actual patch (instead of as a path to a file containing a patch).
+			// All tests pass if this code is commented out.  This code should
+			// be deleted; the user should use the Patches field which
+			// exists for this purpose (inline patch declaration).
 			res, err := p.h.ResmapFactory().RF().SliceFromBytes([]byte(onePath))
 			if err == nil {
 				p.loadedPatches = append(p.loadedPatches, res...)
@@ -60,7 +65,7 @@ func (p *PatchStrategicMergeTransformerPlugin) Config(
 }
 
 func (p *PatchStrategicMergeTransformerPlugin) Transform(m resmap.ResMap) error {
-	patches, err := p.h.ResmapFactory().MergePatches(p.loadedPatches)
+	patches, err := p.h.ResmapFactory().Merge(p.loadedPatches)
 	if err != nil {
 		return err
 	}
@@ -69,18 +74,10 @@ func (p *PatchStrategicMergeTransformerPlugin) Transform(m resmap.ResMap) error
 		if err != nil {
 			return err
 		}
-		err = target.Patch(patch.Kunstructured)
-		if err != nil {
+		if err = m.ApplySmPatch(
+			resource.MakeIdSet([]*resource.Resource{target}), patch); 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
-			}
-		}
 	}
 	return nil
 }

api/builtins/PatchTransformer.go

@@ -5,12 +5,14 @@ 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/resmap"
 	"sigs.k8s.io/kustomize/api/resource"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 	"sigs.k8s.io/yaml"
 )
 
@@ -23,99 +25,91 @@ type PatchTransformerPlugin struct {
 }
 
 func (p *PatchTransformerPlugin) Config(
-	h *resmap.PluginHelpers, c []byte) (err error) {
-	err = yaml.Unmarshal(c, p)
+	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 == "" {
-		err = fmt.Errorf(
+		return fmt.Errorf(
 			"must specify one of patch and path in\n%s", string(c))
-		return
 	}
 	if p.Patch != "" && p.Path != "" {
-		err = fmt.Errorf(
+		return fmt.Errorf(
 			"patch and path can't be set at the same time\n%s", string(c))
-		return
 	}
-	var in []byte
 	if p.Path != "" {
-		in, err = h.Loader().Load(p.Path)
-		if err != nil {
-			return
+		loaded, loadErr := h.Loader().Load(p.Path)
+		if loadErr != nil {
+			return loadErr
 		}
-	}
-	if p.Patch != "" {
-		in = []byte(p.Patch)
+		p.Patch = string(loaded)
 	}
 
-	patchSM, errSM := h.ResmapFactory().RF().FromBytes(in)
-	patchJson, errJson := jsonPatchFromBytes(in)
+	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 {
-		err = fmt.Errorf(
-			"unable to get either a Strategic Merge Patch or JSON patch 6902 from %s", p.Patch)
-		return
+		return fmt.Errorf(
+			"unable to parse SM or JSON patch from [%v]", p.Patch)
 	}
-	if errSM == nil && errJson != nil {
+	if errSM == nil {
 		p.loadedPatch = patchSM
-	}
-	if errJson == nil && errSM != nil {
+	} else {
 		p.decodedPatch = patchJson
 	}
-	if patchSM != nil && patchJson != nil {
-		err = fmt.Errorf(
-			"a patch can't be both a Strategic Merge Patch and JSON patch 6902 %s", p.Patch)
-	}
-
 	return nil
 }
 
 func (p *PatchTransformerPlugin) Transform(m resmap.ResMap) error {
-	if p.loadedPatch != nil && p.Target == nil {
-		target, err := m.GetById(p.loadedPatch.OrgId())
-		if err != nil {
-			return err
-		}
-		err = target.Patch(p.loadedPatch.Kunstructured)
-		if err != nil {
-			return err
-		}
-		return nil
+	if p.loadedPatch == nil {
+		return p.transformJson6902(m, p.decodedPatch)
+	} else {
+		// The patch was a strategic merge patch
+		return p.transformStrategicMerge(m, p.loadedPatch)
 	}
+}
 
+// 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 target.ApplySmPatch(patch)
+	}
+	selected, err := m.Select(*p.Target)
+	if err != nil {
+		return err
+	}
+	return m.ApplySmPatch(resource.MakeIdSet(selected), patch)
+}
+
+// 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 {
-		if p.decodedPatch != nil {
-			rawObj, err := res.MarshalJSON()
-			if err != nil {
-				return err
-			}
-			modifiedObj, err := p.decodedPatch.Apply(rawObj)
-			if err != nil {
-				return errors.Wrapf(
-					err, "failed to apply json patch '%s'", p.Patch)
-			}
-			err = res.UnmarshalJSON(modifiedObj)
-			if err != nil {
-				return err
-			}
-		}
-		if p.loadedPatch != nil {
-			patchCopy := p.loadedPatch.DeepCopy()
-			patchCopy.SetName(res.GetName())
-			patchCopy.SetNamespace(res.GetNamespace())
-			patchCopy.SetGvk(res.GetGvk())
-			err = res.Patch(patchCopy.Kunstructured)
-			if err != nil {
-				return err
-			}
+		err = filtersutil.ApplyToJSON(patchjson6902.Filter{
+			Patch: p.Patch,
+		}, res)
+		if err != nil {
+			return err
 		}
 	}
 	return nil

api/builtins/PrefixSuffixTransformer.go

@@ -5,31 +5,28 @@ package builtins
 
 import (
 	"errors"
-	"fmt"
-
-	"sigs.k8s.io/kustomize/api/transform"
-	"sigs.k8s.io/kustomize/api/types"
 
+	"sigs.k8s.io/kustomize/api/filters/prefixsuffix"
 	"sigs.k8s.io/kustomize/api/resid"
 	"sigs.k8s.io/kustomize/api/resmap"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 	"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"`
+	Prefix     string        `json:"prefix,omitempty" yaml:"prefix,omitempty"`
+	Suffix     string        `json:"suffix,omitempty" yaml:"suffix,omitempty"`
+	FieldSpecs types.FsSlice `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"},
-	},
+// A Gvk skip list for prefix/suffix modification.
+// hard coded for now - eventually should be part of config.
+var prefixSuffixFieldSpecsToSkip = types.FsSlice{
+	{Gvk: resid.Gvk{Kind: "CustomResourceDefinition"}},
+	{Gvk: resid.Gvk{Group: "apiregistration.k8s.io", Kind: "APIService"}},
+	{Gvk: resid.Gvk{Kind: "Namespace"}},
 }
 
 func (p *PrefixSuffixTransformerPlugin) Config(
@@ -48,29 +45,24 @@ func (p *PrefixSuffixTransformerPlugin) Config(
 }
 
 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() {
+		// TODO: move this test into the filter (i.e. make a better filter)
 		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
+		for _, fs := range p.FieldSpecs {
+			// TODO: this is redundant to filter (but needed for now)
+			if !id.IsSelected(&fs.Gvk) {
 				continue
 			}
-
-			if smellsLikeANameChange(&path) {
+			// TODO: move this test into the filter.
+			if smellsLikeANameChange(&fs) {
 				// "metadata/name" is the only field.
 				// this will add a prefix and a suffix
 				// to the resource even if those are
@@ -78,15 +70,11 @@ func (p *PrefixSuffixTransformerPlugin) Transform(m resmap.ResMap) error {
 				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)
+			err := filtersutil.ApplyToJSON(prefixsuffix.Filter{
+				Prefix:    p.Prefix,
+				Suffix:    p.Suffix,
+				FieldSpec: fs,
+			}, r)
 			if err != nil {
 				return err
 			}
@@ -99,8 +87,7 @@ func smellsLikeANameChange(fs *types.FieldSpec) bool {
 	return fs.Path == "metadata/name"
 }
 
-func (p *PrefixSuffixTransformerPlugin) shouldSkip(
-	id resid.ResId) bool {
+func (p *PrefixSuffixTransformerPlugin) shouldSkip(id resid.ResId) bool {
 	for _, path := range prefixSuffixFieldSpecsToSkip {
 		if id.IsSelected(&path.Gvk) {
 			return true
@@ -109,15 +96,6 @@ func (p *PrefixSuffixTransformerPlugin) shouldSkip(
 	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/ReplicaCountTransformer.go

@@ -6,7 +6,8 @@ package builtins
 import (
 	"fmt"
 
-	"sigs.k8s.io/kustomize/api/transform"
+	"sigs.k8s.io/kustomize/api/filters/replicacount"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 
 	"sigs.k8s.io/kustomize/api/resid"
 	"sigs.k8s.io/kustomize/api/resmap"
@@ -30,18 +31,24 @@ func (p *ReplicaCountTransformerPlugin) Config(
 
 func (p *ReplicaCountTransformerPlugin) Transform(m resmap.ResMap) error {
 	found := false
-	for i, replicaSpec := range p.FieldSpecs {
-		matcher := p.createMatcher(i)
+	for _, fs := range p.FieldSpecs {
+		matcher := p.createMatcher(fs)
 		matchOriginal := m.GetMatchingResourcesByOriginalId(matcher)
-		matchCurrent := m.GetMatchingResourcesByCurrentId(matcher)
-
-		for _, res := range append(matchOriginal, matchCurrent...) {
+		resList := append(
+			matchOriginal, m.GetMatchingResourcesByCurrentId(matcher)...)
+		if len(resList) > 0 {
 			found = true
-			err := transform.MutateField(
-				res.Map(), replicaSpec.PathSlice(),
-				replicaSpec.CreateIfNotPresent, p.addReplicas)
-			if err != nil {
-				return err
+			for _, r := range resList {
+				// There are redundant checks in the filter
+				// that we'll live with until resolution of
+				// https://github.com/kubernetes-sigs/kustomize/issues/2506
+				err := filtersutil.ApplyToJSON(replicacount.Filter{
+					Replica:   p.Replica,
+					FieldSpec: fs,
+				}, r)
+				if err != nil {
+					return err
+				}
 			}
 		}
 	}
@@ -59,30 +66,12 @@ func (p *ReplicaCountTransformerPlugin) Transform(m resmap.ResMap) error {
 }
 
 // Match Replica.Name and FieldSpec
-func (p *ReplicaCountTransformerPlugin) createMatcher(i int) resmap.IdMatcher {
+func (p *ReplicaCountTransformerPlugin) createMatcher(fs types.FieldSpec) resmap.IdMatcher {
 	return func(r resid.ResId) bool {
-		return r.Name == p.Replica.Name &&
-			r.Gvk.IsSelected(&p.FieldSpecs[i].Gvk)
+		return r.Name == p.Replica.Name && r.Gvk.IsSelected(&fs.Gvk)
 	}
 }
 
-func (p *ReplicaCountTransformerPlugin) addReplicas(in interface{}) (interface{}, error) {
-	switch m := in.(type) {
-	case int64:
-		// Was already in the field.
-	case map[string]interface{}:
-		if len(m) != 0 {
-			// A map was already in the replicas field, don't want to
-			// discard this data silently.
-			return nil, fmt.Errorf("%#v is expected to be %T", in, m)
-		}
-		// Just got added, default type is map, but we can return anything.
-	default:
-		return nil, fmt.Errorf("%#v is expected to be %T", in, m)
-	}
-	return p.Replica.Count, nil
-}
-
 func NewReplicaCountTransformerPlugin() resmap.TransformerPlugin {
 	return &ReplicaCountTransformerPlugin{}
 }

api/builtins/SecretGenerator.go

@@ -13,12 +13,10 @@ import (
 type SecretGeneratorPlugin struct {
 	h                *resmap.PluginHelpers
 	types.ObjectMeta `json:"metadata,omitempty" yaml:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
-	types.GeneratorOptions
 	types.SecretArgs
 }
 
 func (p *SecretGeneratorPlugin) Config(h *resmap.PluginHelpers, config []byte) (err error) {
-	p.GeneratorOptions = types.GeneratorOptions{}
 	p.SecretArgs = types.SecretArgs{}
 	err = yaml.Unmarshal(config, p)
 	if p.SecretArgs.Name == "" {
@@ -33,8 +31,7 @@ func (p *SecretGeneratorPlugin) Config(h *resmap.PluginHelpers, config []byte) (
 
 func (p *SecretGeneratorPlugin) Generate() (resmap.ResMap, error) {
 	return p.h.ResmapFactory().FromSecretArgs(
-		kv.NewLoader(p.h.Loader(), p.h.Validator()),
-		&p.GeneratorOptions, p.SecretArgs)
+		kv.NewLoader(p.h.Loader(), p.h.Validator()), p.SecretArgs)
 }
 
 func NewSecretGeneratorPlugin() resmap.GeneratorPlugin {

api/builtins/ValueAddTransformer.go

@@ -0,0 +1,142 @@
+// Code generated by pluginator on ValueAddTransformer; DO NOT EDIT.
+// pluginator {unknown  1970-01-01T00:00:00Z  }
+
+package builtins
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"sigs.k8s.io/kustomize/api/filters/namespace"
+	"sigs.k8s.io/kustomize/api/filters/valueadd"
+	"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"
+)
+
+// An 'Add' transformer inspired by the IETF RFC 6902 JSON spec Add operation.
+type ValueAddTransformerPlugin struct {
+	// Value is the value to add.
+	// Defaults to base name of encompassing kustomization root.
+	Value string `json:"value,omitempty" yaml:"value,omitempty"`
+
+	// Targets is a slice of targets that should have the value added.
+	Targets []Target `json:"targets,omitempty" yaml:"targets,omitempty"`
+
+	// TargetFilePath is a file path.  If specified, the file will be parsed into
+	// a slice of Target, and appended to anything that was specified in the
+	// Targets field.  This is just a means to share common target specifications.
+	TargetFilePath string `json:"targetFilePath,omitempty" yaml:"targetFilePath,omitempty"`
+}
+
+// Target describes where to put the value.
+type Target struct {
+	// Selector selects the resources to modify.
+	Selector *types.Selector `json:"selector,omitempty" yaml:"selector,omitempty"`
+
+	// NotSelector selects the resources to exclude
+	// from those included by overly broad selectors.
+	// TODO: implement this?
+	// NotSelector *types.Selector `json:"notSelector,omitempty" yaml:"notSelector,omitempty"`
+
+	// FieldPath is a JSON-style path to the field intended to hold the value.
+	FieldPath string `json:"fieldPath,omitempty" yaml:"fieldPath,omitempty"`
+
+	// FilePathPosition is passed to the filter directly.  Look there for doc.
+	FilePathPosition int `json:"filePathPosition,omitempty" yaml:"filePathPosition,omitempty"`
+}
+
+func (p *ValueAddTransformerPlugin) Config(h *resmap.PluginHelpers, c []byte) error {
+	err := yaml.Unmarshal(c, p)
+	if err != nil {
+		return err
+	}
+	p.Value = strings.TrimSpace(p.Value)
+	if p.Value == "" {
+		p.Value = filepath.Base(h.Loader().Root())
+	}
+	if p.TargetFilePath != "" {
+		bytes, err := h.Loader().Load(p.TargetFilePath)
+		if err != nil {
+			return err
+		}
+		var targets struct {
+			Targets []Target `json:"targets,omitempty" yaml:"targets,omitempty"`
+		}
+		err = yaml.Unmarshal(bytes, &targets)
+		if err != nil {
+			return err
+		}
+		p.Targets = append(p.Targets, targets.Targets...)
+	}
+	if len(p.Targets) == 0 {
+		return fmt.Errorf("must specify at least one target")
+	}
+	for _, target := range p.Targets {
+		if err = validateSelector(target.Selector); err != nil {
+			return err
+		}
+		// TODO: call validateSelector(target.NotSelector) if field added.
+		if err = validateJsonFieldPath(target.FieldPath); err != nil {
+			return err
+		}
+		if target.FilePathPosition < 0 {
+			return fmt.Errorf(
+				"value of FilePathPosition (%d) cannot be negative",
+				target.FilePathPosition)
+		}
+	}
+	return nil
+}
+
+// TODO: implement
+func validateSelector(_ *types.Selector) error {
+	return nil
+}
+
+// TODO: Enforce RFC 6902?
+func validateJsonFieldPath(p string) error {
+	if len(p) == 0 {
+		return fmt.Errorf("fieldPath cannot be empty")
+	}
+	return nil
+}
+
+func (p *ValueAddTransformerPlugin) Transform(m resmap.ResMap) (err error) {
+	for _, t := range p.Targets {
+		var resources []*resource.Resource
+		if t.Selector == nil {
+			resources = m.Resources()
+		} else {
+			resources, err = m.Select(*t.Selector)
+			if err != nil {
+				return err
+			}
+		}
+		// TODO: consider t.NotSelector if implemented
+		for _, res := range resources {
+			if t.FieldPath == types.MetadataNamespacePath {
+				err = filtersutil.ApplyToJSON(namespace.Filter{
+					Namespace: p.Value,
+				}, res)
+			} else {
+				err = filtersutil.ApplyToJSON(valueadd.Filter{
+					Value:            p.Value,
+					FieldPath:        t.FieldPath,
+					FilePathPosition: t.FilePathPosition,
+				}, res)
+			}
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func NewValueAddTransformerPlugin() resmap.TransformerPlugin {
+	return &ValueAddTransformerPlugin{}
+}

api/filesys/util.go

@@ -3,7 +3,11 @@
 
 package filesys
 
-import "path/filepath"
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
 
 // RootedPath returns a rooted path, e.g. "/foo/bar" as
 // opposed to "foo/bar".
@@ -28,3 +32,94 @@ func StripLeadingSeps(s string) string {
 	}
 	return s[k:]
 }
+
+// PathSplit converts a file path to a slice of string.
+// If the path is absolute (if the path has a leading slash),
+// then the first entry in the result is an empty string.
+// Desired:  path == PathJoin(PathSplit(path))
+func PathSplit(incoming string) []string {
+	if incoming == "" {
+		return []string{}
+	}
+	dir, path := filepath.Split(incoming)
+	if dir == string(os.PathSeparator) {
+		if path == "" {
+			return []string{""}
+		}
+		return []string{"", path}
+	}
+	dir = strings.TrimSuffix(dir, string(os.PathSeparator))
+	if dir == "" {
+		return []string{path}
+	}
+	return append(PathSplit(dir), path)
+}
+
+// PathJoin converts a slice of string to a file path.
+// If the first entry is an empty string, then the returned
+// path is absolute (it has a leading slash).
+// Desired:  path == PathJoin(PathSplit(path))
+func PathJoin(incoming []string) string {
+	if len(incoming) == 0 {
+		return ""
+	}
+	if incoming[0] == "" {
+		return string(os.PathSeparator) + filepath.Join(incoming[1:]...)
+	}
+	return filepath.Join(incoming...)
+}
+
+// InsertPathPart inserts 'part' at position 'pos' in the given filepath.
+// The first position is 0.
+//
+// E.g. if part == 'PEACH'
+//
+//                  OLD : NEW                    : POS
+//      --------------------------------------------------------
+//              {empty} : PEACH                  : irrelevant
+//                    / : /PEACH                 : irrelevant
+//                  pie : PEACH/pie              : 0 (or negative)
+//                 /pie : /PEACH/pie             : 0 (or negative)
+//                  raw : raw/PEACH              : 1 (or larger)
+//                 /raw : /raw/PEACH             : 1 (or larger)
+//      a/nice/warm/pie : a/nice/warm/PEACH/pie  : 3
+//     /a/nice/warm/pie : /a/nice/warm/PEACH/pie : 3
+//
+// * An empty part results in no change.
+//
+// * Absolute paths get their leading '/' stripped, treated like
+//   relative paths, and the leading '/' is re-added on output.
+//   The meaning of pos is intentionally the same in either absolute or
+//   relative paths; if it weren't, this function could convert absolute
+//   paths to relative paths, which is not desirable.
+//
+// * For robustness (liberal input, conservative output) Pos values that
+//   that are too small (large) to index the split filepath result in a
+//   prefix (postfix) rather than an error.  Use extreme position values
+//   to assure a prefix or postfix (e.g. 0 will always prefix, and
+//   9999 will presumably always postfix).
+func InsertPathPart(path string, pos int, part string) string {
+	if part == "" {
+		return path
+	}
+	parts := PathSplit(path)
+	if pos < 0 {
+		pos = 0
+	} else if pos > len(parts) {
+		pos = len(parts)
+	}
+	if len(parts) > 0 && parts[0] == "" && pos < len(parts) {
+		// An empty string at 0 indicates an absolute path, and means
+		// we must increment pos.  This change means that a position
+		// specification has the same meaning in relative and absolute paths.
+		// E.g. in either the path 'a/b/c' or the path '/a/b/c',
+		// 'a' is at 0, 'b' is at 1 and 'c' is at 2, and inserting at
+		// zero means a new first field _without_ changing an absolute
+		// path to a relative path.
+		pos++
+	}
+	result := make([]string, len(parts)+1)
+	copy(result, parts[0:pos])
+	result[pos] = part
+	return PathJoin(append(result, parts[pos:]...))
+}

api/filesys/util_test.go

@@ -1,6 +1,7 @@
 package filesys_test
 
 import (
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -93,6 +94,11 @@ func TestFilePathSplit(t *testing.T) {
 			dir:  "",
 			file: "rabbit.jpg",
 		},
+		{
+			full: "/",
+			dir:  "/",
+			file: "",
+		},
 		{
 			full: "/beans",
 			dir:  "/",
@@ -124,6 +130,169 @@ func TestFilePathSplit(t *testing.T) {
 	}
 }
 
+func TestPathSplitAndJoin(t *testing.T) {
+	cases := map[string]struct {
+		original string
+		expected []string
+	}{
+		"Empty": {
+			original: "",
+			expected: []string{},
+		},
+		"One": {
+			original: "hello",
+			expected: []string{"hello"},
+		},
+		"Two": {
+			original: "hello/there",
+			expected: []string{"hello", "there"},
+		},
+		"Three": {
+			original: "hello/my/friend",
+			expected: []string{"hello", "my", "friend"},
+		},
+	}
+	for n, c := range cases {
+		f := func(t *testing.T, original string, expected []string) {
+			actual := PathSplit(original)
+			if len(actual) != len(expected) {
+				t.Fatalf(
+					"expected len %d, got len %d",
+					len(expected), len(actual))
+			}
+			for i := range expected {
+				if expected[i] != actual[i] {
+					t.Fatalf(
+						"at i=%d, expected '%s', got '%s'",
+						i, expected[i], actual[i])
+				}
+			}
+			joined := PathJoin(actual)
+			if joined != original {
+				t.Fatalf(
+					"when rejoining, expected '%s', got '%s'",
+					original, joined)
+			}
+		}
+		t.Run("relative"+n, func(t *testing.T) {
+			f(t, c.original, c.expected)
+		})
+		t.Run("absolute"+n, func(t *testing.T) {
+			f(t,
+				string(os.PathSeparator)+c.original,
+				append([]string{""}, c.expected...))
+		})
+	}
+}
+
+func TestInsertPathPart(t *testing.T) {
+	cases := map[string]struct {
+		original string
+		pos      int
+		part     string
+		expected string
+	}{
+		"rootOne": {
+			original: "/",
+			pos:      0,
+			part:     "___",
+			expected: "/___",
+		},
+		"rootTwo": {
+			original: "/",
+			pos:      444,
+			part:     "___",
+			expected: "/___",
+		},
+		"rootedFirst": {
+			original: "/apple",
+			pos:      0,
+			part:     "___",
+			expected: "/___/apple",
+		},
+		"rootedSecond": {
+			original: "/apple",
+			pos:      444,
+			part:     "___",
+			expected: "/apple/___",
+		},
+		"rootedThird": {
+			original: "/apple/banana",
+			pos:      444,
+			part:     "___",
+			expected: "/apple/banana/___",
+		},
+		"emptyLow": {
+			original: "",
+			pos:      -3,
+			part:     "___",
+			expected: "___",
+		},
+		"emptyHigh": {
+			original: "",
+			pos:      444,
+			part:     "___",
+			expected: "___",
+		},
+		"peachPie": {
+			original: "a/nice/warm/pie",
+			pos:      3,
+			part:     "PEACH",
+			expected: "a/nice/warm/PEACH/pie",
+		},
+		"rootedPeachPie": {
+			original: "/a/nice/warm/pie",
+			pos:      3,
+			part:     "PEACH",
+			expected: "/a/nice/warm/PEACH/pie",
+		},
+		"longStart": {
+			original: "a/b/c/d/e/f",
+			pos:      0,
+			part:     "___",
+			expected: "___/a/b/c/d/e/f",
+		},
+		"rootedLongStart": {
+			original: "/a/b/c/d/e/f",
+			pos:      0,
+			part:     "___",
+			expected: "/___/a/b/c/d/e/f",
+		},
+		"longMiddle": {
+			original: "a/b/c/d/e/f",
+			pos:      3,
+			part:     "___",
+			expected: "a/b/c/___/d/e/f",
+		},
+		"rootedLongMiddle": {
+			original: "/a/b/c/d/e/f",
+			pos:      3,
+			part:     "___",
+			expected: "/a/b/c/___/d/e/f",
+		},
+		"longEnd": {
+			original: "a/b/c/d/e/f",
+			pos:      444,
+			part:     "___",
+			expected: "a/b/c/d/e/f/___",
+		},
+		"rootedLongEnd": {
+			original: "/a/b/c/d/e/f",
+			pos:      444,
+			part:     "___",
+			expected: "/a/b/c/d/e/f/___",
+		},
+	}
+	for n, c := range cases {
+		t.Run(n, func(t *testing.T) {
+			actual := InsertPathPart(c.original, c.pos, c.part)
+			if actual != c.expected {
+				t.Fatalf("expected '%s', got '%s'", c.expected, actual)
+			}
+		})
+	}
+}
+
 func TestStripTrailingSeps(t *testing.T) {
 	cases := []struct {
 		full string

api/filters/annotations/annotations.go

@@ -0,0 +1,44 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package annotations
+
+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"
+)
+
+type annoMap map[string]string
+
+type Filter struct {
+	// Annotations is the set of annotations to apply to the inputs
+	Annotations annoMap `yaml:"annotations,omitempty"`
+
+	// FsSlice contains the FieldSpecs to locate the namespace field
+	FsSlice types.FsSlice
+}
+
+var _ kio.Filter = Filter{}
+
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	keys := filtersutil.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: filtersutil.SetEntry(
+						k, f.Annotations[k], yaml.NodeTagString),
+					CreateKind: yaml.MappingNode, // Annotations are MappingNodes.
+					CreateTag:  yaml.NodeTagMap,
+				}); err != nil {
+					return nil, err
+				}
+			}
+			return node, nil
+		})).Filter(nodes)
+	return nodes, err
+}

api/filters/annotations/annotations_test.go

@@ -0,0 +1,226 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package annotations
+
+import (
+	"strings"
+	"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"
+)
+
+var annosFs = builtinconfig.MakeDefaultConfig().CommonAnnotations
+
+func TestAnnotations_Filter(t *testing.T) {
+	testCases := map[string]struct {
+		input          string
+		expectedOutput string
+		filter         Filter
+		fsslice        types.FsSlice
+	}{
+		"add": {
+			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
+    auto: ford
+    bean: cannellini
+    clown: emmett kelley
+    dragon: smaug
+`,
+			filter: Filter{Annotations: annoMap{
+				"clown":  "emmett kelley",
+				"auto":   "ford",
+				"dragon": "smaug",
+				"bean":   "cannellini",
+			}},
+		},
+		"update": {
+			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: superman
+    fiend: luthor
+    bean: cannellini
+    clown: emmett kelley
+`,
+			filter: Filter{Annotations: annoMap{
+				"clown": "emmett kelley",
+				"hero":  "superman",
+				"fiend": "luthor",
+				"bean":  "cannellini",
+			}},
+		},
+		"data-fieldspecs": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  annotations:
+    sleater: kinney
+a:
+  b:
+    sleater: kinney
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  annotations:
+    sleater: kinney
+a:
+  b:
+    sleater: kinney
+`,
+			filter: Filter{Annotations: annoMap{
+				"sleater": "kinney",
+			}},
+			fsslice: []types.FieldSpec{
+				{
+					Path:               "a/b",
+					CreateIfNotPresent: true,
+				},
+			},
+		},
+
+		"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",
+			}},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			filter := tc.filter
+			filter.FsSlice = append(annosFs, tc.fsslice...)
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expectedOutput),
+				strings.TrimSpace(filtertest_test.RunFilter(t, tc.input, filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/annotations/doc.go

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

api/filters/annotations/example_test.go

@@ -0,0 +1,55 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package annotations
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+)
+
+func ExampleFilter() {
+	fss := builtinconfig.MakeDefaultConfig().CommonAnnotations
+	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{Filter{
+			Annotations: map[string]string{
+				"foo": "bar",
+			},
+			FsSlice: fss,
+		}},
+		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
+	//   annotations:
+	//     foo: bar
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance
+	//   annotations:
+	//     foo: bar
+}

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 +1,180 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package fieldspec
+
+import (
+	"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/yaml"
+)
+
+var _ yaml.Filter = Filter{}
+
+// Filter applies a single fieldSpec to a single object
+// 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, err := isMatchGVK(fltr.FieldSpec, obj); !match || err != nil {
+		return obj, errors.Wrap(err)
+	}
+	fltr.path = splitPath(fltr.FieldSpec.Path)
+	if err := fltr.filter(obj); err != nil {
+		s, _ := obj.String()
+		return nil, errors.WrapPrefixf(err,
+			"obj '%s' at path '%v'", s, fltr.FieldSpec.Path)
+	}
+	return obj, nil
+}
+
+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() {
+		return nil
+	}
+	switch obj.YNode().Kind {
+	case yaml.SequenceNode:
+		return fltr.seq(obj)
+	case yaml.MappingNode:
+		return fltr.field(obj)
+	default:
+		return errors.Errorf("expected sequence or mapping node")
+	}
+}
+
+// field calls filter on the field matching the next path element
+func (fltr Filter) field(obj *yaml.RNode) error {
+	fieldName, isSeq := isSequenceField(fltr.path[0])
+	// lookup the field matching the next path element
+	var lookupField yaml.Filter
+	var kind yaml.Kind
+	tag := yaml.NodeTagEmpty
+	switch {
+	case !fltr.FieldSpec.CreateIfNotPresent || fltr.CreateKind == 0 || isSeq:
+		// dont' create the field if we don't find it
+		lookupField = 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
+		lookupField = yaml.LookupCreate(fltr.CreateKind, fieldName)
+		kind = fltr.CreateKind
+		tag = fltr.CreateTag
+	default:
+		// create the field if it is missing: must be a mapping node
+		lookupField = yaml.LookupCreate(yaml.MappingNode, fieldName)
+		kind = yaml.MappingNode
+		tag = yaml.NodeTagMap
+	}
+
+	// locate (or maybe create) the field
+	field, err := obj.Pipe(lookupField)
+	if err != nil || field == nil {
+		return errors.WrapPrefixf(err, "fieldName: %s", fieldName)
+	}
+
+	// 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) seq(obj *yaml.RNode) error {
+	if err := obj.VisitElements(func(node *yaml.RNode) error {
+		// 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) {
+	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
+}
+
+func splitPath(path string) []string {
+	ps := strings.Split(path, "/")
+	var res []string
+	res = append(res, ps[0])
+	for i := 1; i < len(ps); i++ {
+		lastIndex := len(res) - 1
+		if strings.HasSuffix(res[lastIndex], "\\") {
+			res[lastIndex] = strings.TrimSuffix(res[lastIndex], "\\") + "/" + ps[i]
+		} else {
+			res = append(res, ps[i])
+		}
+	}
+	return res
+}

api/filters/fieldspec/fieldspec_test.go

@@ -0,0 +1,535 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package fieldspec_test
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"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"
+)
+
+type TestCase struct {
+	name      string
+	input     string
+	expected  string
+	filter    fieldspec.Filter
+	fieldSpec string
+	error     string
+}
+
+var tests = []TestCase{
+	{
+		name: "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"),
+		},
+	},
+
+	{
+		name: "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"),
+		},
+	},
+
+	{
+		name: "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"),
+		},
+	},
+
+	{
+		name: "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"),
+		},
+	},
+
+	{
+		name: "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"),
+		},
+	},
+
+	{
+		name: "bad-meta",
+		fieldSpec: `
+path: a/b
+group: foo
+version: v1beta1
+kind: Bar
+`,
+		input: `
+a:
+  b: c
+`,
+		filter: fieldspec.Filter{
+			SetValue: filtersutil.SetScalar("e"),
+		},
+		error: "missing Resource metadata",
+	},
+
+	{
+		name: "miss-match-type",
+		fieldSpec: `
+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': " +
+			"expected sequence or mapping node",
+		filter: fieldspec.Filter{
+			SetValue: filtersutil.SetScalar("e"),
+		},
+	},
+
+	{
+		name: "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,
+		},
+	},
+
+	{
+		name: "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
+	{
+		name: "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
+	{
+		name: "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,
+		},
+	},
+
+	{
+		name: "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,
+		},
+	},
+
+	{
+		name: "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,
+		},
+	},
+	{
+		name: "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,
+		},
+	},
+	{
+		name: "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,
+		},
+	},
+	{
+		name: "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,
+		},
+	},
+	{
+		name: "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,
+		},
+	},
+	{
+		name: "filedname 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,
+		},
+	},
+	{
+		name: "filedname 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,
+		},
+	},
+}
+
+func TestFilter_Filter(t *testing.T) {
+	for i := range tests {
+		test := tests[i]
+		t.Run(test.name, func(t *testing.T) {
+			err := yaml.Unmarshal([]byte(test.fieldSpec), &test.filter.FieldSpec)
+			if !assert.NoError(t, err) {
+				t.FailNow()
+			}
+
+			out := &bytes.Buffer{}
+			rw := &kio.ByteReadWriter{
+				Reader:                bytes.NewBufferString(test.input),
+				Writer:                out,
+				OmitReaderAnnotations: true,
+			}
+
+			// run the filter
+			err = kio.Pipeline{
+				Inputs:  []kio.Reader{rw},
+				Filters: []kio.Filter{kio.FilterAll(test.filter)},
+				Outputs: []kio.Writer{rw},
+			}.Execute()
+			if test.error != "" {
+				if !assert.EqualError(t, err, test.error) {
+					t.FailNow()
+				}
+				// stop rest of test
+				return
+			}
+
+			if !assert.NoError(t, err) {
+				t.FailNow()
+			}
+
+			// check results
+			if !assert.Equal(t,
+				strings.TrimSpace(test.expected),
+				strings.TrimSpace(out.String())) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/fieldspec/gvk.go

@@ -0,0 +1,49 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+package fieldspec
+
+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/fieldspec/gvk_test.go

@@ -0,0 +1,156 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+package fieldspec
+
+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/filtersutil/filtersutil.go

@@ -0,0 +1,21 @@
+// 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/filtersutil_test.go

@@ -0,0 +1,34 @@
+package filtersutil_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+)
+
+func TestSortedKeys(t *testing.T) {
+	testCases := map[string]struct {
+		input    map[string]string
+		expected []string
+	}{
+		"empty": {
+			input:    map[string]string{},
+			expected: []string{}},
+		"one": {
+			input:    map[string]string{"a": "aaa"},
+			expected: []string{"a"}},
+		"three": {
+			input:    map[string]string{"c": "ccc", "b": "bbb", "a": "aaa"},
+			expected: []string{"a", "b", "c"}},
+	}
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			if !assert.Equal(t,
+				filtersutil.SortedMapKeys(tc.input),
+				tc.expected) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/filtersutil/setters.go

@@ -0,0 +1,33 @@
+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 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, tag string) SetFn {
+	n := &yaml.Node{
+		Kind:  yaml.ScalarNode,
+		Value: value,
+		Tag:   tag,
+	}
+	if tag == yaml.NodeTagString && yaml.IsYaml1_1NonString(n) {
+		n.Style = yaml.DoubleQuotedStyle
+	}
+	return func(node *yaml.RNode) error {
+		return node.PipeE(yaml.FieldSetter{
+			Name:  key,
+			Value: yaml.NewRNode(n),
+		})
+	}
+}

api/filters/fsslice/doc.go

@@ -0,0 +1,6 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// 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

@@ -0,0 +1,63 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package fsslice_test
+
+import (
+	"bytes"
+	"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"
+	"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 := fsslice.Filter{
+		CreateKind: yaml.ScalarNode,
+		SetValue:   filtersutil.SetScalar("green"),
+		FsSlice: []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/fsslice/fsslice.go

@@ -0,0 +1,47 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+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"
+)
+
+var _ yaml.Filter = Filter{}
+
+// 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 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) {
+	for i := range fltr.FsSlice {
+		// apply this FieldSpec
+		// create a new filter for each iteration because they
+		// store internal state about the field paths
+		_, err := (&fieldspec.Filter{
+			FieldSpec:  fltr.FsSlice[i],
+			SetValue:   fltr.SetValue,
+			CreateKind: fltr.CreateKind,
+			CreateTag:  fltr.CreateTag,
+		}).Filter(obj)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return obj, nil
+}

api/filters/fsslice/fsslice_test.go

@@ -0,0 +1,121 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package fsslice_test
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"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 {
+	input    string
+	expected string
+	filter   Filter
+	fsSlice  string
+	error    string
+}
+
+var tests = map[string]TestCase{
+	"empty": {
+		fsSlice: `
+`,
+		input: `
+apiVersion: foo/v1
+kind: Bar
+`,
+		expected: `
+apiVersion: foo/v1
+kind: Bar
+`,
+		filter: Filter{
+			SetValue:   filtersutil.SetScalar("e"),
+			CreateKind: yaml.ScalarNode,
+		},
+	},
+	"two": {
+		fsSlice: `
+- path: a/b
+  group: foo
+  version: v1
+  create: true
+  kind: Bar
+- path: q/r[]/s/t
+  group: foo
+  version: v1
+  create: true
+  kind: Bar
+`,
+		input: `
+apiVersion: foo/v1
+kind: Bar
+q:
+  r:
+  - s: {}
+`,
+		expected: `
+apiVersion: foo/v1
+kind: Bar
+q:
+  r:
+  - s: {t: e}
+a:
+  b: e
+`,
+		filter: Filter{
+			SetValue:   filtersutil.SetScalar("e"),
+			CreateKind: yaml.ScalarNode,
+		},
+	},
+}
+
+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()
+			}
+
+			out := &bytes.Buffer{}
+			rw := &kio.ByteReadWriter{
+				Reader:                bytes.NewBufferString(test.input),
+				Writer:                out,
+				OmitReaderAnnotations: true,
+			}
+
+			// run the filter
+			err = kio.Pipeline{
+				Inputs:  []kio.Reader{rw},
+				Filters: []kio.Filter{kio.FilterAll(test.filter)},
+				Outputs: []kio.Writer{rw},
+			}.Execute()
+			if test.error != "" {
+				if !assert.EqualError(t, err, test.error) {
+					t.FailNow()
+				}
+				// stop rest of test
+				return
+			}
+
+			if !assert.NoError(t, err) {
+				t.FailNow()
+			}
+
+			// check results
+			if !assert.Equal(t,
+				strings.TrimSpace(test.expected),
+				strings.TrimSpace(out.String())) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/imagetag/doc.go

@@ -0,0 +1,12 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package imagetag contains two kio.Filter implementations to cover the
+// functionality of the kustomize imagetag transformer.
+//
+// Filter updates fields based on a FieldSpec and an ImageTag.
+//
+// LegacyFilter doesn't use a FieldSpec, and instead only updates image
+// references if the field is name image and it is underneath a field called
+// either containers or initContainers.
+package imagetag

api/filters/imagetag/example_test.go

@@ -0,0 +1,126 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package imagetag
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"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
+spec:
+  containers:
+  - name: FooBar
+    image: nginx
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+spec:
+  containers:
+  - name: BarFoo
+    image: nginx:1.2.1
+`)}},
+		Filters: []kio.Filter{Filter{
+			ImageTag: types.Image{
+				Name:    "nginx",
+				NewName: "apache",
+				Digest:  "12345",
+			},
+			FsSlice: []types.FieldSpec{
+				{
+					Path: "spec/containers[]/image",
+				},
+			},
+		}},
+		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
+	// spec:
+	//   containers:
+	//   - name: FooBar
+	//     image: apache@12345
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance
+	// spec:
+	//   containers:
+	//   - name: BarFoo
+	//     image: apache@12345
+}
+
+func ExampleLegacyFilter() {
+	err := kio.Pipeline{
+		Inputs: []kio.Reader{&kio.ByteReader{Reader: bytes.NewBufferString(`
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - name: FooBar
+    image: nginx
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+spec:
+  containers:
+  - name: BarFoo
+    image: nginx:1.2.1
+`)}},
+		Filters: []kio.Filter{LegacyFilter{
+			ImageTag: types.Image{
+				Name:    "nginx",
+				NewName: "apache",
+				Digest:  "12345",
+			},
+		}},
+		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
+	// spec:
+	//   containers:
+	//   - name: FooBar
+	//     image: apache@12345
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance
+	// spec:
+	//   containers:
+	//   - name: BarFoo
+	//     image: apache@12345
+}

api/filters/imagetag/imagetag.go

@@ -0,0 +1,69 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+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 an image field,
+	// e.g. Path: "spec/myContainers[]/image"
+	FsSlice types.FsSlice `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
+}
+
+var _ kio.Filter = Filter{}
+
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	_, err := kio.FilterAll(yaml.FilterFunc(f.filter)).Filter(nodes)
+	return nodes, err
+}
+
+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),
+	}); err != nil {
+		return nil, err
+	}
+	return node, nil
+}
+
+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`
+}
+
+func updateImageTagFn(imageTag types.Image) filtersutil.SetFn {
+	return func(node *yaml.RNode) error {
+		return node.PipeE(imageTagUpdater{
+			ImageTag: imageTag,
+		})
+	}
+}

api/filters/imagetag/imagetag_test.go

@@ -0,0 +1,674 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package imagetag
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	filtertest "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+)
+
+func TestImageTagUpdater_Filter(t *testing.T) {
+	testCases := map[string]struct {
+		input          string
+		expectedOutput string
+		filter         Filter
+		fsSlice        types.FsSlice
+	}{
+		"ignore CustomResourceDefinition": {
+			input: `
+apiVersion: apiextensions.k8s.io/v1beta1
+kind: CustomResourceDefinition
+metadata:
+  name: whatever
+spec:
+  containers:
+  - image: whatever
+`,
+			expectedOutput: `
+apiVersion: apiextensions.k8s.io/v1beta1
+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
+kind: Foo
+metadata:
+  name: instance
+spec:
+  image: nginx:1.2.1
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  image: apache@12345
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					Digest:  "12345",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/image",
+				},
+			},
+		},
+
+		"multiple matches in sequence": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - image: nginx:1.2.1
+  - image: not_nginx@54321
+  - image: nginx:1.2.1
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  containers:
+  - image: apache:3.2.1
+  - image: not_nginx@54321
+  - image: apache:3.2.1
+`,
+			filter: Filter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					NewTag:  "3.2.1",
+				},
+			},
+			fsSlice: []types.FieldSpec{
+				{
+					Path: "spec/containers/image",
+				},
+			},
+		},
+
+		"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",
+				},
+			},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			filter := tc.filter
+			filter.FsSlice = tc.fsSlice
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expectedOutput),
+				strings.TrimSpace(filtertest.RunFilter(t, tc.input, filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/imagetag/legacy.go

@@ -0,0 +1,113 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package imagetag
+
+import (
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// LegacyFilter is an implementation of the kio.Filter interface
+// that scans through the provided kyaml data structure and updates
+// any values of any image fields that is inside a sequence under
+// a field called either containers or initContainers. The field is only
+// update if it has a value that matches and image reference and the name
+// of the image is a match with the provided ImageTag.
+type LegacyFilter struct {
+	ImageTag types.Image `json:"imageTag,omitempty" yaml:"imageTag,omitempty"`
+}
+
+var _ kio.Filter = LegacyFilter{}
+
+func (lf LegacyFilter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	return kio.FilterAll(yaml.FilterFunc(lf.filter)).Filter(nodes)
+}
+
+func (lf LegacyFilter) filter(node *yaml.RNode) (*yaml.RNode, error) {
+	meta, err := node.GetMeta()
+	if err != nil {
+		return nil, err
+	}
+
+	// We do not make any changes if the type of the resource
+	// is CustomResourceDefinition.
+	if meta.Kind == `CustomResourceDefinition` {
+		return node, nil
+	}
+
+	fff := findFieldsFilter{
+		fields:        []string{"containers", "initContainers"},
+		fieldCallback: checkImageTagsFn(lf.ImageTag),
+	}
+	if err := node.PipeE(fff); err != nil {
+		return nil, err
+	}
+	return node, nil
+}
+
+type fieldCallback func(node *yaml.RNode) error
+
+// findFieldsFilter is an implementation of the kio.Filter
+// interface. It will walk the data structure and look for fields
+// that matches the provided list of field names. For each match,
+// the value of the field will be passed in as a parameter to the
+// provided fieldCallback.
+// TODO: move this to kyaml/filterutils
+type findFieldsFilter struct {
+	fields []string
+
+	fieldCallback fieldCallback
+}
+
+func (f findFieldsFilter) Filter(obj *yaml.RNode) (*yaml.RNode, error) {
+	return obj, f.walk(obj)
+}
+
+func (f findFieldsFilter) walk(node *yaml.RNode) error {
+	switch node.YNode().Kind {
+	case yaml.MappingNode:
+		return node.VisitFields(func(n *yaml.MapNode) error {
+			err := f.walk(n.Value)
+			if err != nil {
+				return err
+			}
+			key := n.Key.YNode().Value
+			if contains(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 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 {
+			return nil
+		}
+
+		return node.VisitElements(func(n *yaml.RNode) error {
+			// Look up any fields on the provided node that is named
+			// image.
+			return n.PipeE(yaml.Get("image"), imageTagUpdater{
+				ImageTag: imageTag,
+			})
+		})
+	}
+}

api/filters/imagetag/legacy_test.go

@@ -0,0 +1,136 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package imagetag
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	filtertest "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+)
+
+func TestLegacyImageTag_Filter(t *testing.T) {
+	testCases := map[string]struct {
+		input          string
+		expectedOutput string
+		filter         LegacyFilter
+	}{
+		"updates multiple images inside 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: LegacyFilter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					Digest:  "12345",
+				},
+			},
+		},
+		"updates inside 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: LegacyFilter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					NewTag:  "3.2.1",
+				},
+			},
+		},
+		"updates on 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: LegacyFilter{
+				ImageTag: types.Image{
+					Name:    "nginx",
+					NewName: "apache",
+					NewTag:  "3.2.1",
+				},
+			},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			filter := tc.filter
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expectedOutput),
+				strings.TrimSpace(filtertest.RunFilter(t, tc.input, filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/imagetag/updater.go

@@ -0,0 +1,43 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package imagetag
+
+import (
+	"sigs.k8s.io/kustomize/api/image"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// imageTagUpdater is an implementation of the kio.Filter interface
+// 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"`
+}
+
+func (u imageTagUpdater) Filter(rn *yaml.RNode) (*yaml.RNode, error) {
+	if err := yaml.ErrorIfInvalid(rn, yaml.ScalarNode); err != nil {
+		return nil, err
+	}
+
+	value := rn.YNode().Value
+
+	if !image.IsImageMatched(value, u.ImageTag.Name) {
+		return rn, nil
+	}
+
+	name, tag := 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
+	}
+
+	return rn.Pipe(yaml.FieldSetter{StringValue: name + tag})
+}

api/filters/labels/doc.go

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

api/filters/labels/example_test.go

@@ -0,0 +1,55 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package labels
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+)
+
+func ExampleFilter() {
+	fss := builtinconfig.MakeDefaultConfig().CommonLabels
+	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{Filter{
+			Labels: map[string]string{
+				"foo": "bar",
+			},
+			FsSlice: fss,
+		}},
+		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
+	//   labels:
+	//     foo: bar
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance
+	//   labels:
+	//     foo: bar
+}

api/filters/labels/labels.go

@@ -0,0 +1,45 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package labels
+
+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"
+)
+
+type labelMap map[string]string
+
+// Filter sets labels.
+type Filter struct {
+	// Labels is the set of labels to apply to the inputs
+	Labels labelMap `yaml:"labels,omitempty"`
+
+	// FsSlice identifies the label fields.
+	FsSlice types.FsSlice
+}
+
+var _ kio.Filter = Filter{}
+
+func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	keys := filtersutil.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: filtersutil.SetEntry(
+						k, f.Labels[k], yaml.NodeTagString),
+					CreateKind: yaml.MappingNode, // Labels are MappingNodes.
+					CreateTag:  yaml.NodeTagMap,
+				}); err != nil {
+					return nil, err
+				}
+			}
+			return node, nil
+		})).Filter(nodes)
+	return nodes, err
+}

api/filters/labels/labels_test.go

@@ -0,0 +1,413 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package labels
+
+import (
+	"strings"
+	"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"
+)
+
+func TestLabels_Filter(t *testing.T) {
+	testCases := map[string]struct {
+		input          string
+		expectedOutput string
+		filter         Filter
+	}{
+		"add": {
+			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
+    auto: ford
+    bean: cannellini
+    clown: emmett kelley
+    dragon: smaug
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"clown":  "emmett kelley",
+					"auto":   "ford",
+					"dragon": "smaug",
+					"bean":   "cannellini",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+		"update": {
+			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: superman
+    fiend: luthor
+    bean: cannellini
+    clown: emmett kelley
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"clown": "emmett kelley",
+					"hero":  "superman",
+					"fiend": "luthor",
+					"bean":  "cannellini",
+				}, FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+
+		"data-fieldspecs": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    sleater: kinney
+a:
+  b:
+    sleater: kinney
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  labels:
+    sleater: kinney
+a:
+  b:
+    sleater: kinney
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"sleater": "kinney",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+					{
+						Path:               "a/b",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+
+		"fieldSpecWithKind": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v2
+kind: Bar
+metadata:
+  name: instance
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    cheese: cheddar
+---
+apiVersion: example.com/v2
+kind: Bar
+metadata:
+  name: instance
+  labels:
+    cheese: cheddar
+a:
+  b:
+    cheese: cheddar
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"cheese": "cheddar",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+					{
+						Gvk: resid.Gvk{
+							Kind: "Bar",
+						},
+						Path:               "a/b",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+
+		"fieldSpecWithVersion": {
+			input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: example.com/v2
+kind: Bar
+metadata:
+  name: instance
+`,
+			expectedOutput: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    cheese: cheddar
+a:
+  b:
+    cheese: cheddar
+---
+apiVersion: example.com/v2
+kind: Bar
+metadata:
+  name: instance
+  labels:
+    cheese: cheddar
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"cheese": "cheddar",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+					{
+						Gvk: resid.Gvk{
+							Version: "v1",
+						},
+						Path:               "a/b",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+		"fieldSpecWithVersionInConfigButNoGroupInData": {
+			input: `
+apiVersion: v1
+kind: Foo
+metadata:
+  name: instance
+---
+apiVersion: v2
+kind: Bar
+metadata:
+  name: instance
+`,
+			expectedOutput: `
+apiVersion: v1
+kind: Foo
+metadata:
+  name: instance
+  labels:
+    cheese: cheddar
+a:
+  b:
+    cheese: cheddar
+---
+apiVersion: v2
+kind: Bar
+metadata:
+  name: instance
+  labels:
+    cheese: cheddar
+`,
+			filter: Filter{
+				Labels: labelMap{
+					"cheese": "cheddar",
+				},
+				FsSlice: []types.FieldSpec{
+					{
+						Path:               "metadata/labels",
+						CreateIfNotPresent: true,
+					},
+					{
+						Gvk: resid.Gvk{
+							Version: "v1",
+						},
+						Path:               "a/b",
+						CreateIfNotPresent: true,
+					},
+				},
+			},
+		},
+
+		"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,
+					},
+				},
+			},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expectedOutput),
+				strings.TrimSpace(filtertest_test.RunFilter(t, tc.input, tc.filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/nameref/doc.go

@@ -0,0 +1,3 @@
+// Package nameref contains a kio.Filter implementation of the kustomize
+// name reference transformer.
+package nameref

api/filters/nameref/nameref.go

@@ -0,0 +1,297 @@
+package nameref
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"sigs.k8s.io/kustomize/api/filters/filtersutil"
+	"sigs.k8s.io/kustomize/api/resid"
+	"sigs.k8s.io/kustomize/api/resmap"
+	"sigs.k8s.io/kustomize/api/resource"
+	"sigs.k8s.io/kustomize/api/types"
+	kyaml_filtersutil "sigs.k8s.io/kustomize/kyaml/filtersutil"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// Filter will update the name reference
+type Filter struct {
+	FieldSpec          types.FieldSpec `json:"fieldSpec,omitempty" yaml:"fieldSpec,omitempty"`
+	Referrer           *resource.Resource
+	Target             resid.Gvk
+	ReferralCandidates resmap.ResMap
+	isRoleRef          bool
+}
+
+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
+	}
+	if strings.HasSuffix(f.FieldSpec.Path, "roleRef/name") {
+		f.isRoleRef = true
+	}
+	switch node.YNode().Kind {
+	case yaml.ScalarNode:
+		return f.setScalar(node)
+	case yaml.MappingNode:
+		// Kind: ValidatingWebhookConfiguration
+		// FieldSpec is webhooks/clientConfig/service
+		return f.setMapping(node)
+	case yaml.SequenceNode:
+		return f.setSequence(node)
+	default:
+		return fmt.Errorf(
+			"node is expected to be either a string or a slice of string or a map of string")
+	}
+}
+
+func (f Filter) setSequence(node *yaml.RNode) error {
+	return applyFilterToSeq(seqFilter{
+		setScalarFn:  f.setScalar,
+		setMappingFn: f.setMapping,
+	}, node)
+}
+
+func (f Filter) setMapping(node *yaml.RNode) error {
+	return setNameAndNs(
+		node,
+		f.Referrer,
+		f.Target,
+		f.ReferralCandidates,
+		f.isRoleRef,
+	)
+}
+
+func (f Filter) setScalar(node *yaml.RNode) error {
+	newValue, err := getSimpleNameField(
+		node.YNode().Value,
+		f.Referrer,
+		f.Target,
+		f.ReferralCandidates,
+		f.ReferralCandidates.Resources(),
+		f.isRoleRef,
+	)
+	if err != nil {
+		return err
+	}
+	err = filtersutil.SetScalar(newValue)(node)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// getRoleRefGvk returns a Gvk in the roleRef field. Return error
+// if the roleRef, roleRef/apiGroup or roleRef/kind is missing.
+func getRoleRefGvk(res json.Marshaler) (*resid.Gvk, error) {
+	n, err := kyaml_filtersutil.GetRNode(res)
+	if err != nil {
+		return nil, err
+	}
+	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
+}
+
+func filterReferralCandidates(
+	referrer *resource.Resource,
+	matches []*resource.Resource,
+	target resid.Gvk,
+) []*resource.Resource {
+	var ret []*resource.Resource
+	for _, m := range matches {
+		// If target kind is not ServiceAccount, we shouldn't consider condidates which
+		// doesn't have same namespace.
+		if target.Kind != "ServiceAccount" && m.GetNamespace() != referrer.GetNamespace() {
+			continue
+		}
+		if !referrer.PrefixesSuffixesEquals(m) {
+			continue
+		}
+		ret = append(ret, m)
+	}
+	return ret
+}
+
+// selectReferral picks the referral among a subset of candidates.
+// It returns the current name and namespace of the selected candidate.
+// Note that the content of the referricalCandidateSubset slice is most of the time
+// identical to the referralCandidates resmap. Still in some cases, such
+// as ClusterRoleBinding, the subset only contains the resources of a specific
+// namespace.
+func selectReferral(
+	oldName string,
+	referrer *resource.Resource,
+	target resid.Gvk,
+	referralCandidates resmap.ResMap,
+	referralCandidateSubset []*resource.Resource,
+	isRoleRef bool) (string, string, error) {
+	var roleRefGvk *resid.Gvk
+	if isRoleRef {
+		var err error
+		roleRefGvk, err = getRoleRefGvk(referrer)
+		if err != nil {
+			return "", "", err
+		}
+	}
+	for _, res := range referralCandidateSubset {
+		id := res.OrgId()
+		// If the we are processing a roleRef, the apiGroup and Kind in the
+		// roleRef are needed to be considered.
+		if (!isRoleRef || id.IsSelected(roleRefGvk)) &&
+			id.IsSelected(&target) && res.GetOriginalName() == oldName {
+			matches := referralCandidates.GetMatchingResourcesByOriginalId(id.Equals)
+			// If there's more than one match,
+			// filter the matches by prefix and suffix
+			if len(matches) > 1 {
+				filteredMatches := filterReferralCandidates(referrer, matches, target)
+				if len(filteredMatches) > 1 {
+					return "", "", fmt.Errorf(
+						"multiple matches for %s:\n  %v",
+						id, getIds(filteredMatches))
+				}
+				// Check is the match the resource we are working on
+				if len(filteredMatches) == 0 || res != filteredMatches[0] {
+					continue
+				}
+			}
+			// In the resource, note that it is referenced
+			// by the referrer.
+			res.AppendRefBy(referrer.CurId())
+			// Return transformed name of the object,
+			// complete with prefixes, hashes, etc.
+			return res.GetName(), res.GetNamespace(), nil
+		}
+	}
+
+	return oldName, "", nil
+}
+
+// utility function to replace a simple string by the new name
+func getSimpleNameField(
+	oldName string,
+	referrer *resource.Resource,
+	target resid.Gvk,
+	referralCandidates resmap.ResMap,
+	referralCandidateSubset []*resource.Resource,
+	isRoleRef bool) (string, error) {
+
+	newName, _, err := selectReferral(oldName, referrer, target,
+		referralCandidates, referralCandidateSubset, isRoleRef)
+
+	return newName, err
+}
+
+func getIds(rs []*resource.Resource) []string {
+	var result []string
+	for _, r := range rs {
+		result = append(result, r.CurId().String()+"\n")
+	}
+	return result
+}
+
+// utility function to replace name field within a map RNode
+// and leverage the namespace field.
+func setNameAndNs(
+	in *yaml.RNode,
+	referrer *resource.Resource,
+	target resid.Gvk,
+	referralCandidates resmap.ResMap,
+	isRoleRef bool) error {
+
+	if in.YNode().Kind != yaml.MappingNode {
+		return fmt.Errorf("expect a mapping node")
+	}
+
+	// Get name field
+	nameNode, err := in.Pipe(yaml.FieldMatcher{
+		Name: "name",
+	})
+	if err != nil || nameNode == nil {
+		return fmt.Errorf("cannot find field 'name' in node")
+	}
+
+	// Get namespace field
+	namespaceNode, err := in.Pipe(yaml.FieldMatcher{
+		Name: "namespace",
+	})
+	if err != nil {
+		return fmt.Errorf("error when find field 'namespace'")
+	}
+
+	// check is namespace matched
+	// name will bot be updated if the namespace doesn't match
+	subset := referralCandidates.Resources()
+	if namespaceNode != nil {
+		namespace := namespaceNode.YNode().Value
+		bynamespace := referralCandidates.GroupedByOriginalNamespace()
+		if _, ok := bynamespace[namespace]; !ok {
+			return nil
+		}
+		subset = bynamespace[namespace]
+	}
+
+	oldName := nameNode.YNode().Value
+	newname, newnamespace, err := selectReferral(oldName, referrer, target,
+		referralCandidates, subset, isRoleRef)
+	if err != nil {
+		return err
+	}
+
+	if (newname == oldName) && (newnamespace == "") {
+		// no candidate found.
+		return nil
+	}
+
+	// set name
+	in.Pipe(yaml.FieldSetter{
+		Name:        "name",
+		StringValue: newname,
+	})
+	if newnamespace != "" {
+		// We don't want value "" to replace value "default" since
+		// the empty string is handled as a wild card here not default namespace
+		// by kubernetes.
+		in.Pipe(yaml.FieldSetter{
+			Name:        "namespace",
+			StringValue: newnamespace,
+		})
+	}
+	return nil
+}

api/filters/nameref/nameref_test.go

@@ -0,0 +1,780 @@
+package nameref
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"sigs.k8s.io/kustomize/api/provider"
+	"sigs.k8s.io/kustomize/api/resid"
+	"sigs.k8s.io/kustomize/api/resmap"
+	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+)
+
+func TestNamerefFilter(t *testing.T) {
+	testCases := map[string]struct {
+		input         string
+		candidates    string
+		expected      string
+		filter        Filter
+		originalNames []string
+	}{
+		"simple scalar": {
+			input: `
+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", ""},
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: newName
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"sequence": {
+			input: `
+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", ""},
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+seq:
+- newName
+- oldName2
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "seq"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"mapping": {
+			input: `
+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", ""},
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+map:
+  name: newName
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "map"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"mapping with namespace": {
+			input: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+map:
+  name: oldName
+  namespace: oldNs
+`,
+			candidates: `
+apiVersion: apps/v1
+kind: Secret
+metadata:
+  name: newName
+  namespace: oldNs
+---
+apiVersion: apps/v1
+kind: NotSecret
+metadata:
+  name: newName2
+`,
+			originalNames: []string{"oldName", ""},
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+map:
+  name: newName
+  namespace: oldNs
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "map"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"null value": {
+			input: `
+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", ""},
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+map:
+  name: null
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "map"},
+				Target: 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.input))
+			if err != nil {
+				t.Fatal(err)
+			}
+			tc.filter.Referrer = referrer
+
+			resMapFactory := resmap.NewFactory(factory, nil)
+			candidatesRes, err := factory.SliceFromBytesWithNames(
+				tc.originalNames, []byte(tc.candidates))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			candidates := resMapFactory.FromResourceSlice(candidatesRes)
+			tc.filter.ReferralCandidates = candidates
+
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expected),
+				strings.TrimSpace(
+					filtertest_test.RunFilter(t, tc.input, tc.filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}
+
+func TestNamerefFilterUnhappy(t *testing.T) {
+	testCases := map[string]struct {
+		input         string
+		candidates    string
+		expected      string
+		filter        Filter
+		originalNames []string
+	}{
+		"multiple match": {
+			input: `
+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"},
+			expected:      "",
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+		},
+		"no name": {
+			input: `
+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"},
+			expected:      "",
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref"},
+				Target: 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.input))
+			if err != nil {
+				t.Fatal(err)
+			}
+			tc.filter.Referrer = referrer
+
+			resMapFactory := resmap.NewFactory(factory, nil)
+			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.input, tc.filter)
+			if err == nil {
+				t.Fatalf("expect an error")
+			}
+			if tc.expected != "" && !assert.EqualError(t, err, tc.expected) {
+				t.FailNow()
+			}
+		})
+	}
+}
+
+func TestCandidatesWithDifferentPrefixSuffix(t *testing.T) {
+	testCases := map[string]struct {
+		input         string
+		candidates    string
+		expected      string
+		filter        Filter
+		originalNames []string
+		prefix        []string
+		suffix        []string
+		inputPrefix   string
+		inputSuffix   string
+		err           bool
+	}{
+		"prefix match": {
+			input: `
+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:   "",
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: newName
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"suffix match": {
+			input: `
+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",
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: newName
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"prefix suffix both match": {
+			input: `
+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",
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: newName
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"multiple match: both": {
+			input: `
+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",
+			expected:      "",
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: true,
+		},
+		"multiple match: only prefix": {
+			input: `
+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:   "",
+			expected:      "",
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: true,
+		},
+		"multiple match: only suffix": {
+			input: `
+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",
+			expected:      "",
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: true,
+		},
+		"no match: neither match": {
+			input: `
+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",
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"no match: prefix doesn't match": {
+			input: `
+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",
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: resid.Gvk{
+					Group:   "apps",
+					Version: "v1",
+					Kind:    "Secret",
+				},
+			},
+			err: false,
+		},
+		"no match: suffix doesn't match": {
+			input: `
+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",
+			expected: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+ref:
+  name: oldName
+`,
+			filter: Filter{
+				FieldSpec: types.FieldSpec{Path: "ref/name"},
+				Target: 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.input))
+			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, nil)
+			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.expected),
+					strings.TrimSpace(
+						filtertest_test.RunFilter(t, tc.input, tc.filter))) {
+					t.FailNow()
+				}
+			} else {
+				_, err := filtertest_test.RunFilterE(t, tc.input, tc.filter)
+				if err == nil {
+					t.Fatalf("an error is expected")
+				}
+			}
+		})
+	}
+}

api/filters/nameref/seqfilter.go

@@ -0,0 +1,57 @@
+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 +1,80 @@
+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/doc.go

@@ -0,0 +1,9 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package namespace contains a kio.Filter implementation of the kustomize
+// namespace transformer.
+//
+// Special cases for known Kubernetes resources have been hardcoded in addition
+// to those defined by the FsSlice.
+package namespace

api/filters/namespace/example_test.go

@@ -0,0 +1,50 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package namespace_test
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"sigs.k8s.io/kustomize/api/filters/namespace"
+	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+)
+
+func ExampleFilter() {
+	fss := builtinconfig.MakeDefaultConfig().NameSpace
+	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
+  namespace: bar
+`)}},
+		Filters: []kio.Filter{namespace.Filter{Namespace: "app", FsSlice: fss}},
+		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
+	//   namespace: app
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance
+	//   namespace: app
+}

api/filters/namespace/namespace.go

@@ -0,0 +1,169 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package namespace
+
+import (
+	"sigs.k8s.io/kustomize/api/filters/fieldspec"
+	"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"
+)
+
+type Filter struct {
+	// Namespace is the namespace to apply to the inputs
+	Namespace string `yaml:"namespace,omitempty"`
+
+	// FsSlice contains the FieldSpecs to locate the namespace field
+	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) {
+	// hacks for hardcoded types -- :(
+	if err := ns.hacks(node); 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)
+
+	// transformations based on data -- :)
+	err := node.PipeE(fsslice.Filter{
+		FsSlice:    ns.FsSlice,
+		SetValue:   filtersutil.SetScalar(ns.Namespace),
+		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
+	}
+
+	if err := ns.metaNamespaceHack(obj, meta); err != nil {
+		return err
+	}
+
+	return ns.roleBindingHack(obj, meta)
+}
+
+// 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 hard-coded list 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 := fieldspec.GetGVK(meta)
+	if !gvk.IsNamespaceableKind() {
+		return nil
+	}
+	f := fsslice.Filter{
+		FsSlice: []types.FieldSpec{
+			{Path: types.MetadataNamespacePath, CreateIfNotPresent: true},
+		},
+		SetValue:   filtersutil.SetScalar(ns.Namespace),
+		CreateKind: yaml.ScalarNode, // Namespace is a ScalarNode
+	}
+	_, err := f.Filter(obj)
+	return err
+}
+
+// roleBindingHack is a hack for implementing the namespace transform
+// for RoleBinding and ClusterRoleBinding resource types.
+// 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
+// subjects:
+// - name: "default" # this will have the namespace set
+//   ...
+// - 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 {
+		return nil
+	}
+
+	// Lookup the namespace field on all elements.
+	// We should change the fieldspec so this isn't necessary.
+	obj, err := obj.Pipe(yaml.Lookup(subjectsField))
+	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.IsMissingOrNull(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
+}
+
+// removeFieldSpecsForHacks removes from the list fieldspecs that
+// have hardcoded implementations
+func (ns Filter) removeFieldSpecsForHacks(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 {
+			continue
+		}
+		val = append(val, fs[i])
+	}
+	return val
+}
+
+const (
+	subjectsField          = "subjects"
+	roleBindingKind        = "RoleBinding"
+	clusterRoleBindingKind = "ClusterRoleBinding"
+)

api/filters/namespace/namespace_test.go

@@ -0,0 +1,311 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package namespace_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"sigs.k8s.io/kustomize/api/filters/namespace"
+	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
+	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+)
+
+var tests = []TestCase{
+	{
+		name: "add",
+		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: foo
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  namespace: foo
+`,
+		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: `
+apiVersion: example.com/v1
+kind: Foo
+---
+apiVersion: example.com/v1
+kind: Bar
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  namespace: foo
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  namespace: foo
+`,
+		filter: namespace.Filter{Namespace: "foo"},
+	},
+
+	{
+		name: "update",
+		input: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  # update this namespace
+  namespace: bar
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  namespace: bar
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+  # update this namespace
+  namespace: foo
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  namespace: foo
+`,
+		filter: namespace.Filter{Namespace: "foo"},
+	},
+
+	{
+		name: "update-rolebinding",
+		input: `
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: default
+---
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: default
+  namespace: foo
+---
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: something
+---
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: something
+  namespace: foo
+`,
+		expected: `
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: default
+  namespace: bar
+metadata:
+  namespace: bar
+---
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: default
+  namespace: bar
+metadata:
+  namespace: bar
+---
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: something
+metadata:
+  namespace: bar
+---
+apiVersion: example.com/v1
+kind: RoleBinding
+subjects:
+- name: something
+  namespace: foo
+metadata:
+  namespace: bar
+`,
+		filter: namespace.Filter{Namespace: "bar"},
+	},
+
+	{
+		name: "update-clusterrolebinding",
+		input: `
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+subjects:
+- name: default
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+subjects:
+- name: default
+  namespace: foo
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+subjects:
+- name: something
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+subjects:
+- name: something
+  namespace: foo
+`,
+		expected: `
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+subjects:
+- name: default
+  namespace: bar
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+subjects:
+- name: default
+  namespace: bar
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+subjects:
+- name: something
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+subjects:
+- name: something
+  namespace: foo
+`,
+		filter: namespace.Filter{Namespace: "bar"},
+	},
+
+	{
+		name: "data-fieldspecs",
+		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: foo
+a:
+  b:
+    c: foo
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+  namespace: foo
+a:
+  b:
+    c: foo
+`,
+		filter: namespace.Filter{Namespace: "foo"},
+		fsslice: []types.FieldSpec{
+			{
+				Path:               "a/b/c",
+				CreateIfNotPresent: true,
+			},
+		},
+	},
+}
+
+type TestCase struct {
+	name     string
+	input    string
+	expected string
+	filter   namespace.Filter
+	fsslice  types.FsSlice
+}
+
+var config = builtinconfig.MakeDefaultConfig()
+
+func TestNamespace_Filter(t *testing.T) {
+	for i := range tests {
+		test := tests[i]
+		t.Run(test.name, func(t *testing.T) {
+			test.filter.FsSlice = append(config.NameSpace, test.fsslice...)
+			if !assert.Equal(t,
+				strings.TrimSpace(test.expected),
+				strings.TrimSpace(
+					filtertest_test.RunFilter(t, test.input, test.filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/patchjson6902/doc.go

@@ -0,0 +1,6 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package namespace contains a kio.Filter implementation of the kustomize
+// patchjson6902 transformer
+package patchjson6902

api/filters/patchjson6902/example_test.go

@@ -0,0 +1,55 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package patchjson6902
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"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
+  namespace: bar
+`)}},
+		Filters: []kio.Filter{
+			Filter{
+				Patch: `
+- op: replace
+  path: /metadata/namespace
+  value: "ns"
+`,
+			},
+		},
+		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
+	//   namespace: ns
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance
+	//   namespace: ns
+}

api/filters/patchjson6902/patchjson6902.go

@@ -0,0 +1,65 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package patchjson6902
+
+import (
+	"strings"
+
+	jsonpatch "github.com/evanphx/json-patch"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+	k8syaml "sigs.k8s.io/yaml"
+)
+
+type Filter struct {
+	Patch string
+
+	decodedPatch jsonpatch.Patch
+}
+
+var _ kio.Filter = Filter{}
+
+func (pf Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	decodedPatch, err := pf.decodePatch()
+	if err != nil {
+		return nil, err
+	}
+	pf.decodedPatch = decodedPatch
+	return kio.FilterAll(yaml.FilterFunc(pf.run)).Filter(nodes)
+}
+
+func (pf Filter) decodePatch() (jsonpatch.Patch, error) {
+	patch := pf.Patch
+	// If the patch doesn't look like a JSON6902 patch, we
+	// try to parse it to json.
+	if !strings.HasPrefix(pf.Patch, "[") {
+		p, err := k8syaml.YAMLToJSON([]byte(patch))
+		if err != nil {
+			return nil, err
+		}
+		patch = string(p)
+	}
+	decodedPatch, err := jsonpatch.DecodePatch([]byte(patch))
+	if err != nil {
+		return nil, err
+	}
+	return decodedPatch, nil
+}
+
+func (pf Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
+	// We don't actually use the kyaml library for manipulating the
+	// yaml here. We just marshal it to json and rely on the
+	// jsonpatch library to take care of applying the patch.
+	// This means ordering might not be preserved with this filter.
+	b, err := node.MarshalJSON()
+	if err != nil {
+		return nil, err
+	}
+	res, err := pf.decodedPatch.Apply(b)
+	if err != nil {
+		return nil, err
+	}
+	err = node.UnmarshalJSON(res)
+	return node, err
+}

api/filters/patchjson6902/patchjson6902_test.go

@@ -0,0 +1,173 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package patchjson6902
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	filtertest "sigs.k8s.io/kustomize/api/testutils/filtertest"
+)
+
+const input = `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  replica: 2
+  template:
+    metadata:
+      labels:
+        old-label: old-value
+    spec:
+      containers:
+      - image: nginx
+        name: nginx
+`
+
+func TestSomething(t *testing.T) {
+	testCases := []struct {
+		testName       string
+		input          string
+		filter         Filter
+		expectedOutput string
+	}{
+		{
+			testName: "single operation, json",
+			input:    input,
+			filter: Filter{
+				Patch: `[
+{"op": "replace", "path": "/spec/replica", "value": 5}
+]`,
+			},
+			expectedOutput: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  replica: 5
+  template:
+    metadata:
+      labels:
+        old-label: old-value
+    spec:
+      containers:
+      - image: nginx
+        name: nginx
+`,
+		},
+		{
+			testName: "multiple operations, json",
+			input:    input,
+			filter: Filter{
+				Patch: `[
+{"op": "replace", "path": "/spec/template/spec/containers/0/name", "value": "my-nginx"},
+{"op": "add", "path": "/spec/replica", "value": 999},
+{"op": "add", "path": "/spec/template/spec/containers/0/command", "value": ["arg1", "arg2", "arg3"]}
+]`,
+			},
+			expectedOutput: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  replica: 999
+  template:
+    metadata:
+      labels:
+        old-label: old-value
+    spec:
+      containers:
+      - command:
+        - arg1
+        - arg2
+        - arg3
+        image: nginx
+        name: my-nginx
+`,
+		},
+		{
+			testName: "single operation, yaml",
+			input:    input,
+			filter: Filter{
+				Patch: `
+- op: replace
+  path: /spec/replica
+  value: 5
+`,
+			},
+			expectedOutput: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  replica: 5
+  template:
+    metadata:
+      labels:
+        old-label: old-value
+    spec:
+      containers:
+      - image: nginx
+        name: nginx
+`,
+		},
+		{
+			testName: "multiple operations, yaml",
+			input:    input,
+			filter: Filter{
+				Patch: `
+- op: replace
+  path: /spec/template/spec/containers/0/name
+  value: my-nginx
+- op: add
+  path: /spec/replica
+  value: 999
+- op: add
+  path: /spec/template/spec/containers/0/command
+  value:
+  - arg1
+  - arg2
+  - arg3
+`,
+			},
+			expectedOutput: `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  replica: 999
+  template:
+    metadata:
+      labels:
+        old-label: old-value
+    spec:
+      containers:
+      - command:
+        - arg1
+        - arg2
+        - arg3
+        image: nginx
+        name: my-nginx
+`,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.testName, func(t *testing.T) {
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expectedOutput),
+				strings.TrimSpace(
+					filtertest.RunFilter(t, tc.input, tc.filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/patchstrategicmerge/doc.go

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

api/filters/patchstrategicmerge/example_test.go

@@ -0,0 +1,49 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package patchstrategicmerge
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+func ExampleFilter() {
+	err := kio.Pipeline{
+		Inputs: []kio.Reader{&kio.ByteReader{Reader: bytes.NewBufferString(`
+apiVersion: example.com/v1
+kind: Foo
+metadata:
+  name: instance
+spec:
+  replicas: 3
+`)}},
+		Filters: []kio.Filter{Filter{
+			Patch: yaml.MustParse(`
+spec:
+  template:
+    containers:
+    - image: nginx
+`),
+		}},
+		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
+	// spec:
+	//   replicas: 3
+	//   template:
+	//     containers:
+	//     - image: nginx
+}

api/filters/patchstrategicmerge/patchstrategicmerge.go

@@ -0,0 +1,33 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package patchstrategicmerge
+
+import (
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+	"sigs.k8s.io/kustomize/kyaml/yaml/merge2"
+)
+
+type Filter struct {
+	Patch *yaml.RNode
+}
+
+var _ kio.Filter = Filter{}
+
+func (pf Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	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
+		}
+		result = append(result, r)
+	}
+	return result, nil
+}

api/filters/patchstrategicmerge/patchstrategicmerge_test.go

@@ -0,0 +1,669 @@
+package patchstrategicmerge
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	filtertest "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+func TestFilter(t *testing.T) {
+	testCases := map[string]struct {
+		input    string
+		patch    *yaml.RNode
+		expected string
+	}{
+		"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
+metadata:
+  name: myDeploy
+kind: Deployment
+`,
+			patch: yaml.MustParse(`
+metadata:
+  name: yourDeploy
+`),
+			expected: `
+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": {
+			input: `
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  containers:
+  - name: nginx
+    args:
+    - abc
+`,
+			patch: yaml.MustParse(`
+spec:
+  containers:
+  - name: nginx
+    args:
+    - def
+`),
+			expected: `
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  containers:
+  - 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
+`,
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			f := Filter{
+				Patch: tc.patch,
+			}
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expected),
+				strings.TrimSpace(
+					filtertest.RunFilter(t, tc.input, f))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/prefixsuffix/doc.go

@@ -0,0 +1,6 @@
+// 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/example_test.go

@@ -0,0 +1,47 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package prefixsuffix_test
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"sigs.k8s.io/kustomize/api/filters/prefixsuffix"
+	"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{prefixsuffix.Filter{
+			Prefix: "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: baz-instance
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: baz-instance
+}

api/filters/prefixsuffix/prefixsuffix.go

@@ -0,0 +1,43 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package prefixsuffix
+
+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 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"`
+
+	FieldSpec types.FieldSpec `json:"fieldSpec,omitempty" yaml:"fieldSpec,omitempty"`
+}
+
+var _ kio.Filter = Filter{}
+
+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 filtersutil.SetScalar(fmt.Sprintf(
+		"%s%s%s", f.Prefix, node.YNode().Value, f.Suffix))(node)
+}

api/filters/prefixsuffix/prefixsuffix_test.go

@@ -0,0 +1,158 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package prefixsuffix_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"sigs.k8s.io/kustomize/api/filters/prefixsuffix"
+	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+)
+
+var tests = map[string]TestCase{
+	"prefix": {
+		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: prefixsuffix.Filter{Prefix: "foo-"},
+		fs:     types.FieldSpec{Path: "metadata/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"},
+		fs:     types.FieldSpec{Path: "metadata/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"},
+		fs:     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: foo-d
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+a:
+  b:
+    c: foo-d
+`,
+		filter: prefixsuffix.Filter{Prefix: "foo-"},
+		fs:     types.FieldSpec{Path: "a/b/c"},
+	},
+}
+
+type TestCase struct {
+	input    string
+	expected string
+	filter   prefixsuffix.Filter
+	fs       types.FieldSpec
+}
+
+func TestFilter(t *testing.T) {
+	for name := range tests {
+		test := tests[name]
+		t.Run(name, func(t *testing.T) {
+			test.filter.FieldSpec = test.fs
+			if !assert.Equal(t,
+				strings.TrimSpace(test.expected),
+				strings.TrimSpace(
+					filtertest_test.RunFilter(t, test.input, test.filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/filters/refvar/doc.go

@@ -0,0 +1,3 @@
+// Package refvar contains a kio.Filter implementation of the kustomize
+// refvar transformer.
+package refvar

api/filters/refvar/refvar.go

@@ -0,0 +1,101 @@
+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"
+
+	expansion2 "sigs.k8s.io/kustomize/api/internal/accumulator/expansion"
+)
+
+// Filter updates $(VAR) style variables with values.
+// The fieldSpecs are the places to look for occurrences of $(VAR).
+type Filter struct {
+	MappingFunc func(string) interface{} `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 int64:
+		node.Value = strconv.FormatInt(newValue, 10)
+		node.Tag = yaml.NodeTagInt
+	case bool:
+		node.SetString(strconv.FormatBool(newValue))
+		node.Tag = yaml.NodeTagBool
+	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 := expansion2.Expand(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: %s, type: %s", contents[i].Value, contents[i].Tag)
+		}
+		if !yaml.IsYNodeString(contents[i+1]) {
+			continue
+		}
+		newValue := expansion2.Expand(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 := expansion2.Expand(item.Value, f.MappingFunc)
+		updateNodeValue(item, newValue)
+	}
+	return nil
+}

api/filters/refvar/refvar_test.go

@@ -0,0 +1,293 @@
+package refvar
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	expansion2 "sigs.k8s.io/kustomize/api/internal/accumulator/expansion"
+	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) {
+	replacementCounts := make(map[string]int)
+
+	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: expansion2.MappingFuncFor(replacementCounts, 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: expansion2.MappingFuncFor(replacementCounts, 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: expansion2.MappingFuncFor(replacementCounts, 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: expansion2.MappingFuncFor(replacementCounts, 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: expansion2.MappingFuncFor(replacementCounts, 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: expansion2.MappingFuncFor(replacementCounts, 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: expansion2.MappingFuncFor(replacementCounts, map[string]interface{}{}),
+				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) {
+	replacementCounts := make(map[string]int)
+
+	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: `obj 'apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+  annotations:
+    config.kubernetes.io/index: '0'
+data:
+  slice:
+  - false
+' at path 'data/slice': invalid value type expect a string`,
+			filter: Filter{
+				MappingFunc: expansion2.MappingFuncFor(replacementCounts, 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: `obj 'apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dep
+  annotations:
+    config.kubernetes.io/index: '0'
+data:
+  1: str
+' at path 'data': invalid map key: 1, type: ` + yaml.NodeTagInt,
+			filter: Filter{
+				MappingFunc: expansion2.MappingFuncFor(replacementCounts, 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/replicacount/doc.go

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

api/filters/replicacount/example_test.go

@@ -0,0 +1,62 @@
+package replicacount
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"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
+spec:
+  template:
+    replicas: 5
+---
+apiVersion: example.com/v1
+kind: Bar
+metadata:
+  name: instance
+spec:
+  template:
+    replicas: 5
+`)}},
+		Filters: []kio.Filter{Filter{
+			Replica: types.Replica{
+				Count: 42,
+				Name:  "instance",
+			},
+			FieldSpec: types.FieldSpec{
+				Path: "spec/template/replicas",
+			},
+		}},
+		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
+	// spec:
+	//   template:
+	//     replicas: 42
+	// ---
+	// apiVersion: example.com/v1
+	// kind: Bar
+	// metadata:
+	//   name: instance
+	// spec:
+	//   template:
+	//     replicas: 42
+}

api/filters/replicacount/replicacount.go

@@ -0,0 +1,37 @@
+package replicacount
+
+import (
+	"strconv"
+
+	"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 updates/sets replicas fields using the fieldSpecs
+type Filter struct {
+	Replica   types.Replica   `json:"replica,omitempty" yaml:"replica,omitempty"`
+	FieldSpec types.FieldSpec `json:"fieldSpec,omitempty" yaml:"fieldSpec,omitempty"`
+}
+
+var _ kio.Filter = Filter{}
+
+func (rc Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
+	return kio.FilterAll(yaml.FilterFunc(rc.run)).Filter(nodes)
+}
+
+func (rc Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
+	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 filtersutil.SetScalar(strconv.FormatInt(rc.Replica.Count, 10))(node)
+}

api/filters/replicacount/replicacount_test.go

@@ -0,0 +1,176 @@
+package replicacount
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
+	"sigs.k8s.io/kustomize/api/types"
+)
+
+func TestFilter(t *testing.T) {
+
+	testCases := map[string]struct {
+		input    string
+		expected string
+		filter   Filter
+	}{
+		"update field": {
+			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"},
+			},
+		},
+		"add field": {
+			input: `
+apiVersion: custom/v1
+kind: Custom
+metadata:
+  name: cus
+spec:
+  template:
+    other: something
+`,
+			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,
+				},
+			},
+		},
+
+		"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,
+				},
+			},
+		},
+		"no update if CreateIfNotPresent is false": {
+			input: `
+apiVersion: custom/v1
+kind: Custom
+metadata:
+  name: cus
+spec:
+  template:
+    other: something
+`,
+			expected: `
+apiVersion: custom/v1
+kind: Custom
+metadata:
+  name: cus
+spec:
+  template:
+    other: something
+`,
+			filter: Filter{
+				Replica: types.Replica{
+					Name:  "cus",
+					Count: 42,
+				},
+				FieldSpec: types.FieldSpec{
+					Path: "spec/template/replicas",
+				},
+			},
+		},
+		"update multiple fields": {
+			input: `
+apiVersion: custom/v1
+kind: Custom
+metadata:
+  name: cus
+spec:
+  template:
+    replicas: 5
+`,
+			expected: `
+apiVersion: custom/v1
+kind: Custom
+metadata:
+  name: cus
+spec:
+  template:
+    replicas: 42
+`,
+			filter: Filter{
+				Replica: types.Replica{
+					Name:  "cus",
+					Count: 42,
+				},
+				FieldSpec: types.FieldSpec{Path: "spec/template/replicas"},
+			},
+		},
+	}
+
+	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()
+			}
+		})
+	}
+}

api/filters/valueadd/valueadd.go

@@ -0,0 +1,124 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package valueadd
+
+import (
+	"strings"
+
+	"sigs.k8s.io/kustomize/api/filesys"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
+// An 'Add' operation aspiring to IETF RFC 6902 JSON.
+//
+// The filter tries to add a value to a node at a particular field path.
+//
+// Kinds of target fields:
+//
+// - Non-existent target field.
+//
+//   The field will be added and the value inserted.
+//
+// - Existing field, scalar or map.
+//
+//   E.g. 'spec/template/spec/containers/[name:nginx]/image'
+//
+//   This behaves like an IETF RFC 6902 Replace operation would;
+//   the existing value is replaced without complaint, even though
+//   this  is an Add operation.  In contrast, a Replace operation
+//   must fail (report an error) if the field doesn't exist.
+//
+// - Existing field, list (array)
+//   Not supported yet.
+//   TODO: Honor fields with RFC-6902-style array indices
+//   TODO: like 'spec/template/spec/containers/2'
+//   TODO: Modify kyaml/yaml/PathGetter to allow this.
+//   The value will be inserted into the array at the given position,
+//   shifting other contents. To instead replace an array entry, use
+//   an implementation of an IETF RFC 6902 Replace operation.
+//
+// For the common case of a filepath in the field value, and a desire
+// to add the value to the filepath (rather than replace the filepath),
+// use a non-zero value of FilePathPosition (see below).
+type Filter struct {
+	// Value is the value to add.
+	//
+	// Empty values are disallowed, i.e. this filter isn't intended
+	// for use in erasing or removing fields. For that, use a filter
+	// more aligned with the IETF RFC 6902 JSON Remove operation.
+	//
+	// At the time of writing, Value's value should be a simple string,
+	// not a JSON document.  This particular filter focuses on easing
+	// injection of a single-sourced cloud project and/or cluster name
+	// into various fields, especially namespace and various filepath
+	// specifications.
+	Value string
+
+	// FieldPath is a JSON-style path to the field intended to hold the value.
+	FieldPath string
+
+	// FilePathPosition is a filepath field index.
+	//
+	// Call the value of this field _i_.
+	//
+	//   If _i_ is zero, negative or unspecified, this field has no effect.
+	//
+	//   If _i_ is > 0, then it's assumed that
+	//   - 'Value' is a string that can work as a directory or file name,
+	//   - the field value intended for replacement holds a filepath.
+	//
+	// The filepath is split into a string slice, the value is inserted
+	// at position [i-1], shifting the rest of the path to the right.
+	// A value of i==1 puts the new value at the start of the path.
+	// This change never converts an absolute path to a relative path,
+	// meaning adding a new field at position i==1 will preserve a
+	// leading slash. E.g. if Value == 'PEACH'
+	//
+	//                  OLD : NEW                    : FilePathPosition
+	//      --------------------------------------------------------
+	//              {empty} : PEACH                  : irrelevant
+	//                    / : /PEACH                 : irrelevant
+	//                  pie : PEACH/pie              : 1 (or less to prefix)
+	//                 /pie : /PEACH/pie             : 1 (or less to prefix)
+	//                  raw : raw/PEACH              : 2 (or more to postfix)
+	//                 /raw : /raw/PEACH             : 2 (or more to postfix)
+	//      a/nice/warm/pie : a/nice/warm/PEACH/pie  : 4
+	//     /a/nice/warm/pie : /a/nice/warm/PEACH/pie : 4
+	//
+	// For robustness (liberal input, conservative output) FilePathPosition
+	// values that that are too large to index the split filepath result in a
+	// postfix rather than an error.  So use 1 to prefix, 9999 to postfix.
+	FilePathPosition int `json:"filePathPosition,omitempty" yaml:"filePathPosition,omitempty"`
+}
+
+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, "/")
+			// 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),
+			// and if found, take it as a signal that this should be a
+			// SequenceNode instead of a ScalarNode, and insert the value
+			// into the proper slot, shifting every over.
+			n, err := node.Pipe(yaml.LookupCreate(yaml.ScalarNode, fields...))
+			if err != nil {
+				return node, err
+			}
+			// TODO: allow more kinds
+			if err := yaml.ErrorIfInvalid(n, yaml.ScalarNode); err != nil {
+				return nil, err
+			}
+			newValue := f.Value
+			if f.FilePathPosition > 0 {
+				newValue = filesys.InsertPathPart(
+					n.YNode().Value, f.FilePathPosition-1, newValue)
+			}
+			return n.Pipe(yaml.FieldSetter{StringValue: newValue})
+		})).Filter(nodes)
+	return nodes, err
+}

api/filters/valueadd/valueadd_test.go

@@ -0,0 +1,109 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package valueadd
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	filtertest_test "sigs.k8s.io/kustomize/api/testutils/filtertest"
+)
+
+const someResource = `
+kind: SomeKind
+spec:
+  resourceRef:
+    external: projects/whatever
+`
+
+func TestValueAddFilter(t *testing.T) {
+	testCases := map[string]struct {
+		input          string
+		expectedOutput string
+		filter         Filter
+	}{
+		"simpleAdd": {
+			input: `
+kind: SomeKind
+`,
+			expectedOutput: `
+kind: SomeKind
+spec:
+  resourceRef:
+    external: valueAdded
+`,
+			filter: Filter{
+				Value:     "valueAdded",
+				FieldPath: "spec/resourceRef/external",
+			},
+		},
+		"replaceExisting": {
+			input: someResource,
+			expectedOutput: `
+kind: SomeKind
+spec:
+  resourceRef:
+    external: valueAdded
+`,
+			filter: Filter{
+				Value:     "valueAdded",
+				FieldPath: "spec/resourceRef/external",
+			},
+		},
+		"prefixExisting": {
+			input: someResource,
+			expectedOutput: `
+kind: SomeKind
+spec:
+  resourceRef:
+    external: valueAdded/projects/whatever
+`,
+			filter: Filter{
+				Value:            "valueAdded",
+				FieldPath:        "spec/resourceRef/external",
+				FilePathPosition: 1,
+			},
+		},
+		"postfixExisting": {
+			input: someResource,
+			expectedOutput: `
+kind: SomeKind
+spec:
+  resourceRef:
+    external: projects/whatever/valueAdded
+`,
+			filter: Filter{
+				Value:            "valueAdded",
+				FieldPath:        "spec/resourceRef/external",
+				FilePathPosition: 99,
+			},
+		},
+		"placeInMiddleOfExisting": {
+			input: someResource,
+			expectedOutput: `
+kind: SomeKind
+spec:
+  resourceRef:
+    external: projects/valueAdded/whatever
+`,
+			filter: Filter{
+				Value:            "valueAdded",
+				FieldPath:        "spec/resourceRef/external",
+				FilePathPosition: 2,
+			},
+		},
+	}
+
+	for tn, tc := range testCases {
+		t.Run(tn, func(t *testing.T) {
+			filter := tc.filter
+			if !assert.Equal(t,
+				strings.TrimSpace(tc.expectedOutput),
+				strings.TrimSpace(filtertest_test.RunFilter(t, tc.input, filter))) {
+				t.FailNow()
+			}
+		})
+	}
+}

api/go.mod

@@ -1,19 +1,25 @@
 module sigs.k8s.io/kustomize/api
 
-go 1.13
+go 1.15
 
 require (
 	github.com/evanphx/json-patch v4.5.0+incompatible
-	github.com/go-openapi/spec v0.19.4
+	github.com/go-errors/errors v1.0.1
+	github.com/go-openapi/spec v0.19.5
 	github.com/golangci/golangci-lint v1.21.0
+	github.com/google/go-cmp v0.3.0
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
-	github.com/monopole/mdrip v1.0.1
+	github.com/hashicorp/go-multierror v1.1.0
 	github.com/pkg/errors v0.8.1
-	golang.org/x/tools v0.0.0-20191010075000-0337d82405ff
-	gopkg.in/yaml.v2 v2.2.4
+	github.com/stretchr/testify v1.4.0
+	github.com/yujunz/go-getter v1.5.1-lite.0.20201201013212-6d9c071adddf
+	golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e
+	gopkg.in/yaml.v2 v2.3.0
+	gopkg.in/yaml.v3 v3.0.0-20200121175148-a6ecf24a6d71
 	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/yaml v1.1.0
+	sigs.k8s.io/kustomize/kyaml v0.10.3
+	sigs.k8s.io/yaml v1.2.0
 )

api/go.sum

@@ -1,15 +1,12 @@
 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 v0.9.2/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/adal v0.8.0/go.mod h1:Z6vX6WXXuyieHAXwMj0S6HY6e6wcHn37qQMBQlvY3lc=
 github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
-github.com/Azure/go-autorest/autorest/date v0.2.0/go.mod h1:vcORJHLJEh643/Ioh9+vPmf1Ij9AEBM5FuBIXLmIy0g=
 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/autorest/mocks v0.3.0/go.mod h1:a8FDP3DYzQ4RYfVAxAN3SVSiiO77gL2j2ronKKP0syM=
 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=
@@ -18,21 +15,33 @@ github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb0
 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=
+github.com/PuerkitoBio/goquery v1.5.0/go.mod h1:qD2PgZ9lccMbQlc7eEOjaeRlFQON7xY8kdmcsrnKqMg=
 github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
+github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/purell v1.1.1 h1:WEQqlqaGbrPkxLJWfBwQmfEAE1Z7ONdDLqrN38tNFfI=
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
+github.com/agnivade/levenshtein v1.0.1/go.mod h1:CURSv5d9Uaml+FovSIICkLbAUZ9S4RqaHDIsdSBg7lM=
 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/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
+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/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
+github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
 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=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+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=
@@ -41,6 +50,7 @@ github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
 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=
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
+github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/davecgh/go-spew v0.0.0-20151105211317-5215b55f46b2/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -48,15 +58,13 @@ 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=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
+github.com/docker/go-units v0.3.3/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
+github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
-github.com/docker/spdystream v0.0.0-20181023171402-6480d4af844c/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
+github.com/dustmop/soup v1.1.2-0.20190516214245-38228baa104e/go.mod h1:CgNC6SGbT+Xb8wGGvzilttZL1mc5sQ/5KkcxsZttMIk=
 github.com/elazarl/goproxy v0.0.0-20170405201442-c4fc26588b6e/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
-github.com/elazarl/goproxy v0.0.0-20191011121108-aa519ddbe484/go.mod h1:Ro8st/ElPeALwNFlcTpWmkr6IoMFfkjXAvTHpevnDsM=
-github.com/elazarl/goproxy/ext v0.0.0-20190711103511-473e67f1d7d2/go.mod h1:gNh8nYJoAm43RfaxurUnxr+N1PwuFV3ZMl/efxlIlY8=
 github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633 h1:H2pdYOb3KQ1/YsqVWoWNLQO+fusocsw354rqGTZtAgw=
 github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
-github.com/emicklei/go-restful v2.9.6+incompatible h1:tfrHha8zJ01ywiOEC1miGY8st1/igzWB8OmvPgoYX7w=
-github.com/emicklei/go-restful v2.9.6+incompatible/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
 github.com/evanphx/json-patch v4.2.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
 github.com/evanphx/json-patch v4.5.0+incompatible h1:ouOWdg56aJriqS0huScTkVXPC5IcNrDCXZ6OoTAWu7M=
 github.com/evanphx/json-patch v4.5.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
@@ -66,8 +74,12 @@ github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/ghodss/yaml v0.0.0-20150909031657-73d445a93680/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/globalsign/mgo v0.0.0-20180905125535-1ca0a4f7cbcb/go.mod h1:xkRDCp4j0OGD1HRkm4kmhM+pmpv3AKq5SU7GMg4oO/Q=
+github.com/globalsign/mgo v0.0.0-20181015135952-eeefdecb41b8/go.mod h1:xkRDCp4j0OGD1HRkm4kmhM+pmpv3AKq5SU7GMg4oO/Q=
 github.com/go-critic/go-critic v0.3.5-0.20190904082202-d79a9f0c64db h1:GYXWx7Vr3+zv833u+8IoXbNnQY0AdXsxAgI0kX7xcwA=
 github.com/go-critic/go-critic v0.3.5-0.20190904082202-d79a9f0c64db/go.mod h1:+sE8vrLDS2M0pZkBk0wy6+nLdKexVDrl/jBqQOTDThA=
+github.com/go-errors/errors v1.0.1 h1:LUHzmkK3GUKUrL/1gfBUxAHzcev3apQlezX/+O7ma6w=
+github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-lintpack/lintpack v0.5.2 h1:DI5mA3+eKdWeJ40nU4d6Wc26qmdG8RCi/btYq0TuRN0=
 github.com/go-lintpack/lintpack v0.5.2/go.mod h1:NwZuYi2nUHho8XEIZ6SIxihrnPoqBTDqfpXvXAN0sXM=
@@ -75,20 +87,55 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas=
 github.com/go-ole/go-ole v1.2.1/go.mod h1:7FAglXiTm7HKlQRDeOQ6ZNUHidzCWXuZWq/1dTyBNF8=
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@@ -111,6 +158,7 @@ github.com/go-toolsmith/strparse v1.0.0 h1:Vcw78DnpCAKlM20kSbAyO4mPfJn/lyYA4BJUD
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@@ -169,9 +211,8 @@ github.com/golangci/unconvert v0.0.0-20180507085042-28b1c447d1f4/go.mod h1:Izgrg
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@@ -373,10 +423,21 @@ github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyC
 github.com/valyala/fasthttp v1.2.0/go.mod h1:4vX61m6KN+xDduDNwXrhIAVZaZaZiQ1luJk8LWSxF3s=
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+go.mongodb.org/mongo-driver v1.0.3/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
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@@ -384,10 +445,12 @@ golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnf
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@@ -396,27 +459,29 @@ golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTk
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@@ -433,21 +498,22 @@ golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -456,6 +522,7 @@ golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGm
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@@ -463,14 +530,15 @@ golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3
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 golang.org/x/tools v0.0.0-20190910044552-dd2b5c81c578/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20190911230505-6bfd74cf029c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20190912215617-3720d1ec3678/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20190930201159-7c411dea38b0/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191010075000-0337d82405ff h1:XdBG6es/oFDr1HwaxkxgVve7NB281QhxgK/i4voubFs=
 golang.org/x/tools v0.0.0-20191010075000-0337d82405ff/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e h1:aZzprAO9/8oim3qStq3wc1Xuxx4QmAGriC4VU4ojemQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
@@ -492,15 +560,19 @@ gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMy
 gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc=
 gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/russross/blackfriday.v2 v2.0.0 h1:+FlnIV8DSQnT7NZ43hcVKcdJdzZoeCmJj4Ql8gq5keA=
-gopkg.in/russross/blackfriday.v2 v2.0.0/go.mod h1:6sSBNz/GtOm/pJTuh5UmBK2ZHfmnxGbl2NZg1UliSOI=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200121175148-a6ecf24a6d71 h1:Xe2gvTZUJpsvOWUnvmL/tmhVBZUmHSvLbMjRj6NUUKo=
+gopkg.in/yaml.v3 v3.0.0-20200121175148-a6ecf24a6d71/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
@@ -518,7 +590,7 @@ k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
 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 v0.0.0-20191030222137-2b95a09bc58d/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
+k8s.io/utils v0.0.0-20191114184206-e782cd3c129f h1:GiPwtSzdP43eI1hpPCbROQCCIgCuiMMNF8YUVLF3vJo=
 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=
@@ -526,12 +598,11 @@ mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b h1:DxJ5nJdkhDlLok9K6qO+5290kphD
 mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
 mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f h1:Cq7MalBHYACRd6EesksG1Q8EoIAKOsiZviGKbOLIej4=
 mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f/go.mod h1:4G1h5nDURzA3bwVMZIVpwbkw+04kSxk3rAtzlimaUJw=
-sigs.k8s.io/kustomize/api v0.2.0/go.mod h1:zVtMg179jW1gr74jo9fc2Ac9dLYLTZZThc3DDb9lDW4=
-sigs.k8s.io/kustomize/pluginator/v2 v2.0.0 h1:sES7e09G19Q0VjRp4ATSYKpTXoWaX8WMSHfw6u3G2Ok=
-sigs.k8s.io/kustomize/pluginator/v2 v2.0.0/go.mod h1:zrXhTv8BAKt0egmZX/8AtMOSFUSWM9YuoHvvqz8/eHE=
-sigs.k8s.io/kustomize/pseudo/k8s v0.1.0/go.mod h1:bl/gVJgYYhJZCZdYU2BfnaKYAlqFkgbJEkpl302jEss=
+sigs.k8s.io/kustomize/kyaml v0.10.3 h1:ARSJUMN/c3k31DYxRfZ+vp/UepUQjg9zCwny7Oj908I=
+sigs.k8s.io/kustomize/kyaml v0.10.3/go.mod h1:RA+iCHA2wPCOfv6uG6TfXXWhYsHpgErq/AljxWKuxtg=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
-sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 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=
 sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4 h1:JPJh2pk3+X4lXAkZIk2RuE/7/FoK9maXw+TNPJhVS/c=
 sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

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
@@ -50,3 +52,105 @@ func Encode(hex string) (string, error) {
 func Hash(data string) string {
 	return fmt.Sprintf("%x", sha256.Sum256([]byte(data)))
 }
+
+// HashRNode returns the hash value of input RNode
+func HashRNode(node *yaml.RNode) (string, error) {
+	// get node kind
+	kindNode, err := node.Pipe(yaml.FieldMatcher{Name: "kind"})
+	if err != nil {
+		return "", err
+	}
+	kind := kindNode.YNode().Value
+
+	// calculate hash for different kinds
+	encoded := ""
+	switch kind {
+	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(Hash(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
+}

api/hasher/hasher_test.go

@@ -1,12 +1,13 @@
 // Copyright 2019 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-package hasher_test
+package hasher
 
 import (
+	"strings"
 	"testing"
 
-	. "sigs.k8s.io/kustomize/api/hasher"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 func TestSortArrayAndComputeHash(t *testing.T) {
@@ -39,3 +40,314 @@ func TestHash(t *testing.T) {
 		t.Errorf("expected hash %q but got %q", expect, sum)
 	}
 }
+
+func TestConfigMapHash(t *testing.T) {
+	cases := []struct {
+		desc   string
+		cmYaml string
+		hash   string
+		err    string
+	}{
+		// empty map
+		{"empty data", `
+apiVersion: v1
+kind: ConfigMap`, "6ct58987ht", ""},
+		// one key
+		{"one key", `
+apiVersion: v1
+kind: ConfigMap
+data: 
+  one: ""`, "9g67k2htb6", ""},
+		// three keys (tests sorting order)
+		{"three keys", `
+apiVersion: v1
+kind: ConfigMap
+data:
+  two: 2
+  one: ""
+  three: 3`, "7757f9kkct", ""},
+		// empty binary data map
+		{"empty binary data", `
+apiVersion: v1
+kind: ConfigMap`, "6ct58987ht", ""},
+		// one key with binary data
+		{"one key with binary data", `
+apiVersion: v1
+kind: ConfigMap
+binaryData:
+  one: ""`, "6mtk2m274t", ""},
+		// three keys with binary data (tests sorting order)
+		{"three keys with binary data", `
+apiVersion: v1
+kind: ConfigMap
+binaryData:
+  two: 2
+  one: ""
+  three: 3`, "9th7kc28dg", ""},
+		// two keys, one with string and another with binary data
+		{"two keys with one each", `
+apiVersion: v1
+kind: ConfigMap
+data:
+  one: ""
+binaryData:
+  two: ""`, "698h7c7t9m", ""},
+	}
+
+	for _, c := range cases {
+		node, err := yaml.Parse(c.cmYaml)
+		if err != nil {
+			t.Fatal(err)
+		}
+		h, err := HashRNode(node)
+		if SkipRest(t, c.desc, err, c.err) {
+			continue
+		}
+		if c.hash != h {
+			t.Errorf("case %q, expect hash %q but got %q", c.desc, c.hash, h)
+		}
+	}
+}
+
+func TestSecretHash(t *testing.T) {
+	cases := []struct {
+		desc       string
+		secretYaml string
+		hash       string
+		err        string
+	}{
+		// empty map
+		{"empty data", `
+apiVersion: v1
+kind: Secret
+type: my-type`, "5gmgkf8578", ""},
+		// one key
+		{"one key", `
+apiVersion: v1
+kind: Secret
+type: my-type
+data:
+  one: ""`, "74bd68bm66", ""},
+		// three keys (tests sorting order)
+		{"three keys", `
+apiVersion: v1
+kind: Secret
+type: my-type
+data:
+  two: 2
+  one: ""
+  three: 3`, "4gf75c7476", ""},
+		// with stringdata
+		{"stringdata", `
+apiVersion: v1
+kind: Secret
+type: my-type
+data:
+  one: ""
+stringData:
+  two: 2`, "c4h4264gdb", ""},
+		// empty stringdata
+		{"empty stringdata", `
+apiVersion: v1
+kind: Secret
+type: my-type
+data:
+  one: ""`, "74bd68bm66", ""},
+	}
+
+	for _, c := range cases {
+		node, err := yaml.Parse(c.secretYaml)
+		if err != nil {
+			t.Fatal(err)
+		}
+		h, err := HashRNode(node)
+		if SkipRest(t, c.desc, err, c.err) {
+			continue
+		}
+		if c.hash != h {
+			t.Errorf("case %q, expect hash %q but got %q", c.desc, c.hash, h)
+		}
+	}
+}
+
+func TestUnstructuredHash(t *testing.T) {
+	cases := []struct {
+		desc         string
+		unstructured string
+		hash         string
+		err          string
+	}{
+		{"minimal", `
+apiVersion: test/v1
+kind: TestResource
+metadata:
+  name: my-resource`, "244782mkb7", ""},
+		{"with spec", `
+apiVersion: test/v1
+kind: TestResource
+metadata:
+  name: my-resource
+spec:
+  foo: 1
+  bar: abc`, "59m2mdccg4", ""},
+	}
+
+	for _, c := range cases {
+		node, err := yaml.Parse(c.unstructured)
+		if err != nil {
+			t.Fatal(err)
+		}
+		h, err := HashRNode(node)
+		if SkipRest(t, c.desc, err, c.err) {
+			continue
+		}
+		if c.hash != h {
+			t.Errorf("case %q, expect hash %q but got %q", c.desc, c.hash, h)
+		}
+	}
+}
+
+func TestEncodeConfigMap(t *testing.T) {
+	cases := []struct {
+		desc   string
+		cmYaml string
+		expect string
+		err    string
+	}{
+		// empty map
+		{"empty data", `
+apiVersion: v1
+kind: ConfigMap`, `{"data":"","kind":"ConfigMap","name":""}`, ""},
+		// one key
+		{"one key", `
+apiVersion: v1
+kind: ConfigMap
+data: 
+  one: ""`, `{"data":{"one":""},"kind":"ConfigMap","name":""}`, ""},
+		// three keys (tests sorting order)
+		{"three keys", `
+apiVersion: v1
+kind: ConfigMap
+data:
+  two: 2
+  one: ""
+  three: 3`, `{"data":{"one":"","three":3,"two":2},"kind":"ConfigMap","name":""}`, ""},
+		// empty binary map
+		{"empty data", `
+apiVersion: v1
+kind: ConfigMap`, `{"data":"","kind":"ConfigMap","name":""}`, ""},
+		// one key with binary data
+		{"one key", `
+apiVersion: v1
+kind: ConfigMap
+binaryData:
+  one: ""`, `{"binaryData":{"one":""},"data":"","kind":"ConfigMap","name":""}`, ""},
+		// three keys with binary data (tests sorting order)
+		{"three keys", `
+apiVersion: v1
+kind: ConfigMap
+binaryData:
+  two: 2
+  one: ""
+  three: 3`, `{"binaryData":{"one":"","three":3,"two":2},"data":"","kind":"ConfigMap","name":""}`, ""},
+		// two keys, one string and one binary values
+		{"two keys with one each", `
+apiVersion: v1
+kind: ConfigMap
+data:
+  one: ""
+binaryData:
+  two: ""`, `{"binaryData":{"two":""},"data":{"one":""},"kind":"ConfigMap","name":""}`, ""},
+	}
+	for _, c := range cases {
+		node, err := yaml.Parse(c.cmYaml)
+		if err != nil {
+			t.Fatal(err)
+		}
+		s, err := encodeConfigMap(node)
+		if SkipRest(t, c.desc, err, c.err) {
+			continue
+		}
+		if s != c.expect {
+			t.Errorf("case %q, expect %q but got %q from encode %#v", c.desc, c.expect, s, c.cmYaml)
+		}
+	}
+}
+
+func TestEncodeSecret(t *testing.T) {
+	cases := []struct {
+		desc       string
+		secretYaml string
+		expect     string
+		err        string
+	}{
+		// empty map
+		{"empty data", `
+apiVersion: v1
+kind: Secret
+type: my-type`, `{"data":"","kind":"Secret","name":"","type":"my-type"}`, ""},
+		// one key
+		{"one key", `
+apiVersion: v1
+kind: Secret
+type: my-type
+data:
+  one: ""`, `{"data":{"one":""},"kind":"Secret","name":"","type":"my-type"}`, ""},
+		// three keys (tests sorting order) - note json.Marshal base64 encodes the values because they come in as []byte
+		{"three keys", `
+apiVersion: v1
+kind: Secret
+type: my-type
+data:
+  two: 2
+  one: ""
+  three: 3`, `{"data":{"one":"","three":3,"two":2},"kind":"Secret","name":"","type":"my-type"}`, ""},
+		// with stringdata
+		{"stringdata", `
+apiVersion: v1
+kind: Secret
+type: my-type
+data:
+  one: ""
+stringData:
+  two: 2`, `{"data":{"one":""},"kind":"Secret","name":"","stringData":{"two":2},"type":"my-type"}`, ""},
+		// empty stringdata
+		{"empty stringdata", `
+apiVersion: v1
+kind: Secret
+type: my-type
+data:
+  one: ""`, `{"data":{"one":""},"kind":"Secret","name":"","type":"my-type"}`, ""},
+	}
+	for _, c := range cases {
+		node, err := yaml.Parse(c.secretYaml)
+		if err != nil {
+			t.Fatal(err)
+		}
+		s, err := encodeSecret(node)
+		if SkipRest(t, c.desc, err, c.err) {
+			continue
+		}
+		if s != c.expect {
+			t.Errorf("case %q, expect %q but got %q from encode %#v", c.desc, c.expect, s, c.secretYaml)
+		}
+	}
+}
+
+// SkipRest returns true if there was a non-nil error or if we expected an error that didn't happen,
+// and logs the appropriate error on the test object.
+// The return value indicates whether we should skip the rest of the test case due to the error result.
+func SkipRest(t *testing.T, desc string, err error, contains string) bool {
+	if err != nil {
+		if len(contains) == 0 {
+			t.Errorf("case %q, expect nil error but got %q", desc, err.Error())
+		} else if !strings.Contains(err.Error(), contains) {
+			t.Errorf("case %q, expect error to contain %q but got %q", desc, contains, err.Error())
+		}
+		return true
+	} else if len(contains) > 0 {
+		t.Errorf("case %q, expect error to contain %q but got nil error", desc, contains)
+		return true
+	}
+	return false
+}

api/ifc/ifc.go

@@ -38,36 +38,69 @@ type Loader interface {
 	Cleanup() error
 }
 
-// Kunstructured allows manipulation of k8s objects
-// that do not have Golang structs.
+// Kunstructured represents a Kubernetes Resource Model object.
 type Kunstructured interface {
-	Map() map[string]interface{}
-	SetMap(map[string]interface{})
+	// Several uses.
 	Copy() Kunstructured
-	GetFieldValue(string) (interface{}, error)
-	GetString(string) (string, error)
-	GetStringSlice(string) ([]string, error)
-	GetBool(path string) (bool, error)
-	GetFloat64(path string) (float64, error)
-	GetInt64(path string) (int64, error)
-	GetSlice(path string) ([]interface{}, error)
-	GetStringMap(path string) (map[string]string, error)
-	GetMap(path string) (map[string]interface{}, error)
-	MarshalJSON() ([]byte, error)
-	UnmarshalJSON([]byte) error
-	GetGvk() resid.Gvk
-	SetGvk(resid.Gvk)
-	GetKind() string
-	GetName() string
-	SetName(string)
-	SetNamespace(string)
-	GetLabels() map[string]string
-	SetLabels(map[string]string)
+
+	// Used by Resource.Replace, which in turn is used in many places, e.g.
+	//  - resource.Resource.Merge
+	//  - resWrangler.appendReplaceOrMerge (AbsorbAll)
+	//  - api.internal.k8sdeps.transformer.patch.conflictdetector
 	GetAnnotations() map[string]string
-	SetAnnotations(map[string]string)
-	MatchesLabelSelector(selector string) (bool, error)
+
+	// Used by ResAccumulator and ReplacementTransformer.
+	GetFieldValue(string) (interface{}, error)
+
+	// Used by Resource.OrgId
+	GetGvk() resid.Gvk
+
+	// Used by resource.Factory.SliceFromBytes
+	GetKind() string
+
+	// Used by Resource.Replace
+	GetLabels() map[string]string
+
+	// Used by Resource.CurId and resource factory.
+	GetName() string
+
+	// Used by special case code in
+	// ResMap.SubsetThatCouldBeReferencedByResource
+	GetSlice(path string) ([]interface{}, error)
+
+	// GetString returns the value of a string field.
+	// Used by Resource.GetNamespace
+	GetString(string) (string, error)
+
+	// Several uses.
+	Map() map[string]interface{}
+
+	// Used by Resource.AsYAML and Resource.String
+	MarshalJSON() ([]byte, error)
+
+	// Used by resWrangler.Select
 	MatchesAnnotationSelector(selector string) (bool, error)
-	Patch(Kunstructured) error
+
+	// Used by resWrangler.Select
+	MatchesLabelSelector(selector string) (bool, error)
+
+	// Used by Resource.Replace.
+	SetAnnotations(map[string]string)
+
+	// Used by PatchStrategicMergeTransformer.
+	SetGvk(resid.Gvk)
+
+	// Used by Resource.Replace and used to remove "validated by" labels.
+	SetLabels(map[string]string)
+
+	// Used by Resource.Replace.
+	SetName(string)
+
+	// Used by Resource.Replace.
+	SetNamespace(string)
+
+	// Needed, for now, by kyaml/filtersutil.ApplyToJSON.
+	UnmarshalJSON([]byte) error
 }
 
 // KunstructuredFactory makes instances of Kunstructured.
@@ -75,14 +108,8 @@ type KunstructuredFactory interface {
 	SliceFromBytes([]byte) ([]Kunstructured, error)
 	FromMap(m map[string]interface{}) Kunstructured
 	Hasher() KunstructuredHasher
-	MakeConfigMap(
-		kvLdr KvLoader,
-		options *types.GeneratorOptions,
-		args *types.ConfigMapArgs) (Kunstructured, error)
-	MakeSecret(
-		kvLdr KvLoader,
-		options *types.GeneratorOptions,
-		args *types.SecretArgs) (Kunstructured, error)
+	MakeConfigMap(kvLdr KvLoader, args *types.ConfigMapArgs) (Kunstructured, error)
+	MakeSecret(kvLdr KvLoader, args *types.SecretArgs) (Kunstructured, error)
 }
 
 // KunstructuredHasher returns a hash of the argument

api/image/image.go

@@ -0,0 +1,50 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package image
+
+import (
+	"regexp"
+	"strings"
+)
+
+// IsImageMatched returns true if the value of t is identical to the
+// image name in the full image name and tag as given by s.
+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
+}

api/image/image_test.go

@@ -0,0 +1,80 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package image
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsImageMatched(t *testing.T) {
+	testCases := []struct {
+		testName  string
+		value     string
+		name      string
+		isMatched bool
+	}{
+		{
+			testName:  "identical",
+			value:     "nginx",
+			name:      "nginx",
+			isMatched: true,
+		},
+		{
+			testName:  "name is match",
+			value:     "nginx:12345",
+			name:      "nginx",
+			isMatched: true,
+		},
+		{
+			testName:  "name is not a match",
+			value:     "apache:12345",
+			name:      "nginx",
+			isMatched: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.testName, func(t *testing.T) {
+			assert.Equal(t, tc.isMatched, IsImageMatched(tc.value, tc.name))
+		})
+	}
+}
+
+func TestSplit(t *testing.T) {
+	testCases := []struct {
+		testName string
+		value    string
+		name     string
+		tag      string
+	}{
+		{
+			testName: "no tag",
+			value:    "nginx",
+			name:     "nginx",
+			tag:      "",
+		},
+		{
+			testName: "with tag",
+			value:    "nginx:1.2.3",
+			name:     "nginx",
+			tag:      ":1.2.3",
+		},
+		{
+			testName: "with digest",
+			value:    "nginx@12345",
+			name:     "nginx",
+			tag:      "@12345",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.testName, func(t *testing.T) {
+			name, tag := Split(tc.value)
+			assert.Equal(t, tc.name, name)
+			assert.Equal(t, tc.tag, tag)
+		})
+	}
+}

api/internal/accumulator/namereferencetransformer.go

@@ -4,14 +4,12 @@
 package accumulator
 
 import (
-	"fmt"
 	"log"
 
+	"sigs.k8s.io/kustomize/api/filters/nameref"
 	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
-	"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/kyaml/filtersutil"
 )
 
 type nameReferenceTransformer struct {
@@ -86,16 +84,12 @@ func (o *nameReferenceTransformer) Transform(m resmap.ResMap) error {
 					if candidates == nil {
 						candidates = m.SubsetThatCouldBeReferencedByResource(referrer)
 					}
-					err := transform.MutateField(
-						referrer.Map(),
-						fSpec.PathSlice(),
-						fSpec.CreateIfNotPresent,
-						o.getNewNameFunc(
-							// referrer could be an HPA instance,
-							// target could be Gvk for Deployment,
-							// candidate a list of resources "reachable"
-							// from the HPA.
-							referrer, target.Gvk, candidates))
+					err := filtersutil.ApplyToJSON(nameref.Filter{
+						FieldSpec:          fSpec,
+						Referrer:           referrer,
+						Target:             target.Gvk,
+						ReferralCandidates: candidates,
+					}, referrer)
 					if err != nil {
 						return err
 					}
@@ -105,165 +99,3 @@ func (o *nameReferenceTransformer) Transform(m resmap.ResMap) error {
 	}
 	return nil
 }
-
-// selectReferral picks the referral among a subset of candidates.
-// It returns the current name and namespace of the selected candidate.
-// Note that the content of the referricalCandidateSubset slice is most of the time
-// identical to the referralCandidates resmap. Still in some cases, such
-// as ClusterRoleBinding, the subset only contains the resources of a specific
-// namespace.
-func (o *nameReferenceTransformer) selectReferral(
-	oldName string,
-	referrer *resource.Resource,
-	target resid.Gvk,
-	referralCandidates resmap.ResMap,
-	referralCandidateSubset []*resource.Resource) (interface{}, interface{}, error) {
-
-	for _, res := range referralCandidateSubset {
-		id := res.OrgId()
-		if id.IsSelected(&target) && res.GetOriginalName() == oldName {
-			matches := referralCandidates.GetMatchingResourcesByOriginalId(id.Equals)
-			// If there's more than one match, there's no way
-			// to know which one to pick, so emit error.
-			if len(matches) > 1 {
-				return nil, nil, fmt.Errorf(
-					"multiple matches for %s:\n  %v",
-					id, getIds(matches))
-			}
-			// In the resource, note that it is referenced
-			// by the referrer.
-			res.AppendRefBy(referrer.CurId())
-			// Return transformed name of the object,
-			// complete with prefixes, hashes, etc.
-			return res.GetName(), res.GetNamespace(), nil
-		}
-	}
-
-	return oldName, nil, nil
-}
-
-// utility function to replace a simple string by the new name
-func (o *nameReferenceTransformer) getSimpleNameField(
-	oldName string,
-	referrer *resource.Resource,
-	target resid.Gvk,
-	referralCandidates resmap.ResMap,
-	referralCandidateSubset []*resource.Resource) (interface{}, error) {
-
-	newName, _, err := o.selectReferral(oldName, referrer, target,
-		referralCandidates, referralCandidateSubset)
-
-	return newName, err
-}
-
-// utility function to replace name field within a map[string]interface{}
-// and leverage the namespace field.
-func (o *nameReferenceTransformer) getNameAndNsStruct(
-	inMap map[string]interface{},
-	referrer *resource.Resource,
-	target resid.Gvk,
-	referralCandidates resmap.ResMap) (interface{}, error) {
-
-	// Example:
-	if _, ok := inMap["name"]; !ok {
-		return nil, fmt.Errorf(
-			"%#v is expected to contain a name field", inMap)
-	}
-	oldName, ok := inMap["name"].(string)
-	if !ok {
-		return nil, fmt.Errorf(
-			"%#v is expected to contain a name field of type string", oldName)
-	}
-
-	subset := referralCandidates.Resources()
-	if namespacevalue, ok := inMap["namespace"]; ok {
-		namespace := namespacevalue.(string)
-		bynamespace := referralCandidates.GroupedByOriginalNamespace()
-		if _, ok := bynamespace[namespace]; !ok {
-			return inMap, nil
-		}
-		subset = bynamespace[namespace]
-	}
-
-	newname, newnamespace, err := o.selectReferral(oldName, referrer, target,
-		referralCandidates, subset)
-	if err != nil {
-		return nil, err
-	}
-
-	if (newname == oldName) && (newnamespace == nil) {
-		// no candidate found.
-		return inMap, nil
-	}
-
-	inMap["name"] = newname
-	if newnamespace != "" {
-		// We don't want value "" to replace value "default" since
-		// the empty string is handled as a wild card here not default namespace
-		// by kubernetes.
-		inMap["namespace"] = newnamespace
-	}
-	return inMap, nil
-
-}
-
-func (o *nameReferenceTransformer) getNewNameFunc(
-	referrer *resource.Resource,
-	target resid.Gvk,
-	referralCandidates resmap.ResMap) func(in interface{}) (interface{}, error) {
-	return func(in interface{}) (interface{}, error) {
-		switch thing := in.(type) {
-		case string:
-			return o.getSimpleNameField(thing, referrer, target,
-				referralCandidates, referralCandidates.Resources())
-		case map[string]interface{}:
-			// Kind: ValidatingWebhookConfiguration
-			// FieldSpec is webhooks/clientConfig/service
-			return o.getNameAndNsStruct(thing, referrer, target,
-				referralCandidates)
-		case []interface{}:
-			for idx, item := range thing {
-				switch value := item.(type) {
-				case string:
-					// Kind: Role/ClusterRole
-					// FieldSpec is rules.resourceNames
-					newName, err := o.getSimpleNameField(value, referrer, target,
-						referralCandidates, referralCandidates.Resources())
-					if err != nil {
-						return nil, err
-					}
-					thing[idx] = newName
-				case map[string]interface{}:
-					// 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
-					newMap, err := o.getNameAndNsStruct(value, referrer, target,
-						referralCandidates)
-					if err != nil {
-						return nil, err
-					}
-					thing[idx] = newMap
-				default:
-					return nil, fmt.Errorf(
-						"%#v is expected to be either a []string or a []map[string]interface{}", in)
-				}
-			}
-			return in, nil
-		default:
-			return nil, fmt.Errorf(
-				"%#v is expected to be either a string or a []interface{}", in)
-		}
-	}
-}
-
-func getIds(rs []*resource.Resource) []string {
-	var result []string
-	for _, r := range rs {
-		result = append(result, r.CurId().String()+"\n")
-	}
-	return result
-}

api/internal/accumulator/namereferencetransformer_test.go

@@ -8,17 +8,14 @@ import (
 	"testing"
 
 	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
-	"sigs.k8s.io/kustomize/api/k8sdeps/kunstruct"
+	"sigs.k8s.io/kustomize/api/provider"
 	"sigs.k8s.io/kustomize/api/resid"
 	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
 	resmaptest_test "sigs.k8s.io/kustomize/api/testutils/resmaptest"
 )
 
 func TestNameReferenceHappyRun(t *testing.T) {
-	rf := resource.NewFactory(
-		kunstruct.NewKunstructuredFactoryImpl())
-	m := resmaptest_test.NewRmBuilder(t, rf).AddWithName(
+	m := resmaptest_test.NewRmBuilderDefault(t).AddWithName(
 		"cm1",
 		map[string]interface{}{
 			"apiVersion": "v1",
@@ -261,7 +258,8 @@ func TestNameReferenceHappyRun(t *testing.T) {
 			},
 		}).ResMap()
 
-	expected := resmaptest_test.NewSeededRmBuilder(t, rf, m.ShallowCopy()).ReplaceResource(
+	expected := resmaptest_test.NewSeededRmBuilderDefault(
+		t, m.ShallowCopy()).ReplaceResource(
 		map[string]interface{}{
 			"group":      "apps",
 			"apiVersion": "v1",
@@ -475,14 +473,12 @@ func TestNameReferenceHappyRun(t *testing.T) {
 }
 
 func TestNameReferenceUnhappyRun(t *testing.T) {
-	rf := resource.NewFactory(
-		kunstruct.NewKunstructuredFactoryImpl())
 	tests := []struct {
 		resMap      resmap.ResMap
 		expectedErr string
 	}{
 		{
-			resMap: resmaptest_test.NewRmBuilder(t, rf).Add(
+			resMap: resmaptest_test.NewRmBuilderDefault(t).Add(
 				map[string]interface{}{
 					"apiVersion": "rbac.authorization.k8s.io/v1",
 					"kind":       "ClusterRole",
@@ -502,7 +498,7 @@ func TestNameReferenceUnhappyRun(t *testing.T) {
 				}).ResMap(),
 			expectedErr: "is expected to be"},
 		{
-			resMap: resmaptest_test.NewRmBuilder(t, rf).Add(
+			resMap: resmaptest_test.NewRmBuilderDefault(t).Add(
 				map[string]interface{}{
 					"apiVersion": "rbac.authorization.k8s.io/v1",
 					"kind":       "ClusterRole",
@@ -520,7 +516,7 @@ func TestNameReferenceUnhappyRun(t *testing.T) {
 						},
 					},
 				}).ResMap(),
-			expectedErr: "is expected to contain a name field"},
+			expectedErr: "cannot find field 'name' in node"},
 	}
 
 	nrt := newNameReferenceTransformer(builtinconfig.MakeDefaultConfig().NameReference)
@@ -538,8 +534,7 @@ func TestNameReferenceUnhappyRun(t *testing.T) {
 }
 
 func TestNameReferencePersistentVolumeHappyRun(t *testing.T) {
-	rf := resource.NewFactory(
-		kunstruct.NewKunstructuredFactoryImpl())
+	rf := provider.NewDefaultDepProvider().GetResourceFactory()
 
 	v1 := rf.FromMapWithName(
 		"volume1",
@@ -664,9 +659,7 @@ const (
 // object with the same original names (uniquename) in different namespaces
 // and with different current Id.
 func TestNameReferenceNamespace(t *testing.T) {
-	rf := resource.NewFactory(
-		kunstruct.NewKunstructuredFactoryImpl())
-	m := resmaptest_test.NewRmBuilder(t, rf).
+	m := resmaptest_test.NewRmBuilderDefault(t).
 		// Add ConfigMap with the same org name in noNs, "ns1" and "ns2" namespaces
 		AddWithName(orgname, map[string]interface{}{
 			"apiVersion": "v1",
@@ -715,7 +708,7 @@ func TestNameReferenceNamespace(t *testing.T) {
 		AddWithNsAndName(ns1, orgname, deploymentMap(ns1, prefixedname, orgname, orgname)).
 		AddWithNsAndName(ns2, orgname, deploymentMap(ns2, suffixedname, orgname, orgname)).ResMap()
 
-	expected := resmaptest_test.NewSeededRmBuilder(t, rf, m.ShallowCopy()).
+	expected := resmaptest_test.NewSeededRmBuilderDefault(t, m.ShallowCopy()).
 		ReplaceResource(deploymentMap(defaultNs, modifiedname, modifiedname, modifiedname)).
 		ReplaceResource(deploymentMap(ns1, prefixedname, prefixedname, prefixedname)).
 		ReplaceResource(deploymentMap(ns2, suffixedname, suffixedname, suffixedname)).ResMap()
@@ -735,9 +728,7 @@ func TestNameReferenceNamespace(t *testing.T) {
 // object with the same original names (uniquename) in different namespaces
 // and with different current Id.
 func TestNameReferenceClusterWide(t *testing.T) {
-	rf := resource.NewFactory(
-		kunstruct.NewKunstructuredFactoryImpl())
-	m := resmaptest_test.NewRmBuilder(t, rf).
+	m := resmaptest_test.NewRmBuilderDefault(t).
 		// Add ServiceAccount with the same org name in noNs, "ns1" and "ns2" namespaces
 		AddWithName(orgname, map[string]interface{}{
 			"apiVersion": "v1",
@@ -789,9 +780,9 @@ func TestNameReferenceClusterWide(t *testing.T) {
 				"name": modifiedname,
 			},
 			"roleRef": map[string]interface{}{
-				"apiVersion": "rbac.authorization.k8s.io/v1",
-				"kind":       "ClusterRole",
-				"name":       orgname,
+				"apiGroup": "rbac.authorization.k8s.io",
+				"kind":     "ClusterRole",
+				"name":     orgname,
 			},
 			"subjects": []interface{}{
 				map[string]interface{}{
@@ -816,7 +807,7 @@ func TestNameReferenceClusterWide(t *testing.T) {
 				},
 			}}).ResMap()
 
-	expected := resmaptest_test.NewSeededRmBuilder(t, rf, m.ShallowCopy()).
+	expected := resmaptest_test.NewSeededRmBuilderDefault(t, m.ShallowCopy()).
 		ReplaceResource(
 			map[string]interface{}{
 				"apiVersion": "rbac.authorization.k8s.io/v1",
@@ -845,9 +836,9 @@ func TestNameReferenceClusterWide(t *testing.T) {
 					"name": modifiedname,
 				},
 				"roleRef": map[string]interface{}{
-					"apiVersion": "rbac.authorization.k8s.io/v1",
-					"kind":       "ClusterRole",
-					"name":       modifiedname,
+					"apiGroup": "rbac.authorization.k8s.io",
+					"kind":     "ClusterRole",
+					"name":     modifiedname,
 				},
 				// The following tests required a change in
 				// getNameFunc implementation in order to leverage
@@ -898,9 +889,7 @@ func TestNameReferenceClusterWide(t *testing.T) {
 // object with the same original names (uniquename) in different namespaces
 // and with different current Id.
 func TestNameReferenceNamespaceTransformation(t *testing.T) {
-	rf := resource.NewFactory(
-		kunstruct.NewKunstructuredFactoryImpl())
-	m := resmaptest_test.NewRmBuilder(t, rf).
+	m := resmaptest_test.NewRmBuilderDefault(t).
 		AddWithNsAndName(ns4, orgname, map[string]interface{}{
 			"apiVersion": "v1",
 			"kind":       "Secret",
@@ -937,9 +926,9 @@ func TestNameReferenceNamespaceTransformation(t *testing.T) {
 				"name": modifiedname,
 			},
 			"roleRef": map[string]interface{}{
-				"apiVersion": "rbac.authorization.k8s.io/v1",
-				"kind":       "ClusterRole",
-				"name":       orgname,
+				"apiGroup": "rbac.authorization.k8s.io",
+				"kind":     "ClusterRole",
+				"name":     orgname,
 			},
 			"subjects": []interface{}{
 				map[string]interface{}{
@@ -964,7 +953,7 @@ func TestNameReferenceNamespaceTransformation(t *testing.T) {
 				},
 			}}).ResMap()
 
-	expected := resmaptest_test.NewSeededRmBuilder(t, rf, m.ShallowCopy()).
+	expected := resmaptest_test.NewSeededRmBuilderDefault(t, m.ShallowCopy()).
 		ReplaceResource(
 			map[string]interface{}{
 				"apiVersion": "rbac.authorization.k8s.io/v1",
@@ -973,9 +962,9 @@ func TestNameReferenceNamespaceTransformation(t *testing.T) {
 					"name": modifiedname,
 				},
 				"roleRef": map[string]interface{}{
-					"apiVersion": "rbac.authorization.k8s.io/v1",
-					"kind":       "ClusterRole",
-					"name":       modifiedname,
+					"apiGroup": "rbac.authorization.k8s.io",
+					"kind":     "ClusterRole",
+					"name":     modifiedname,
 				},
 				// The following tests required a change in
 				// getNameFunc implementation in order to leverage
@@ -1026,9 +1015,7 @@ func TestNameReferenceNamespaceTransformation(t *testing.T) {
 // It validates the change done is IsSameFuzzyNamespace which
 // uses the IsNsEquals method instead of the simple == operator.
 func TestNameReferenceCandidateSelection(t *testing.T) {
-	rf := resource.NewFactory(
-		kunstruct.NewKunstructuredFactoryImpl())
-	m := resmaptest_test.NewRmBuilder(t, rf).
+	m := resmaptest_test.NewRmBuilderDefault(t).
 		AddWithName("cm1", map[string]interface{}{
 			"apiVersion": "v1",
 			"kind":       "ConfigMap",
@@ -1045,7 +1032,7 @@ func TestNameReferenceCandidateSelection(t *testing.T) {
 		AddWithName("deploy1", deploymentMap("", "p1-deploy1", "cm1", "secret1")).
 		ResMap()
 
-	expected := resmaptest_test.NewSeededRmBuilder(t, rf, m.ShallowCopy()).
+	expected := resmaptest_test.NewSeededRmBuilderDefault(t, m.ShallowCopy()).
 		ReplaceResource(deploymentMap("", "p1-deploy1", "p1-cm1-hash", "p1-secret1-hash")).
 		ResMap()
 

api/internal/accumulator/refvartransformer.go

@@ -4,13 +4,12 @@
 package accumulator
 
 import (
-	"fmt"
-
 	expansion2 "sigs.k8s.io/kustomize/api/internal/accumulator/expansion"
 
+	"sigs.k8s.io/kustomize/api/filters/refvar"
 	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/transform"
 	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 )
 
 type refVarTransformer struct {
@@ -31,55 +30,6 @@ func newRefVarTransformer(
 	}
 }
 
-// replaceVars accepts as 'in' a string, or string array, which can have
-// embedded instances of $VAR style variables, e.g. a container command string.
-// The function returns the string with the variables expanded to their final
-// values.
-func (rv *refVarTransformer) replaceVars(in interface{}) (interface{}, error) {
-	switch vt := in.(type) {
-	case []interface{}:
-		var xs []interface{}
-		for _, a := range in.([]interface{}) {
-			xs = append(xs, expansion2.Expand(a.(string), rv.mappingFunc))
-		}
-		return xs, nil
-	case map[string]interface{}:
-		inMap := in.(map[string]interface{})
-		xs := make(map[string]interface{}, len(inMap))
-		for k, v := range inMap {
-			s, ok := v.(string)
-			if !ok {
-				// This field not contain a $(VAR) since it is not
-				// of string type. For instance .spec.replicas: 3 in
-				// a Deployment object
-				xs[k] = v
-			} else {
-				// This field can potentially contains a $(VAR) since it is
-				// of string type. For instance .spec.replicas: $(REPLICAS)
-				// in a Deployment object
-				xs[k] = expansion2.Expand(s, rv.mappingFunc)
-			}
-		}
-		return xs, nil
-	case interface{}:
-		s, ok := in.(string)
-		if !ok {
-			// This field not contain a $(VAR) since it is not of string type.
-			return in, nil
-		}
-		// This field can potentially contain a $(VAR) since it is
-		// of string type.
-		return expansion2.Expand(s, rv.mappingFunc), nil
-	// staticcheck erroneously claims that `case nil`
-	// is unreachable here, so suppressing it.
-	//nolint:staticcheck
-	case nil:
-		return nil, nil
-	default:
-		return "", fmt.Errorf("invalid type encountered %T", vt)
-	}
-}
-
 // UnusedVars returns slice of Var names that were unused
 // after a Transform run.
 func (rv *refVarTransformer) UnusedVars() []string {
@@ -100,12 +50,12 @@ func (rv *refVarTransformer) Transform(m resmap.ResMap) error {
 		rv.replacementCounts, rv.varMap)
 	for _, res := range m.Resources() {
 		for _, fieldSpec := range rv.fieldSpecs {
-			if res.OrgId().IsSelected(&fieldSpec.Gvk) {
-				if err := transform.MutateField(
-					res.Map(), fieldSpec.PathSlice(),
-					false, rv.replaceVars); err != nil {
-					return err
-				}
+			err := filtersutil.ApplyToJSON(refvar.Filter{
+				MappingFunc: rv.mappingFunc,
+				FieldSpec:   fieldSpec,
+			}, res)
+			if err != nil {
+				return err
 			}
 		}
 	}

api/internal/accumulator/refvartransformer_test.go

@@ -7,10 +7,8 @@ import (
 	"reflect"
 	"testing"
 
-	"sigs.k8s.io/kustomize/api/k8sdeps/kunstruct"
 	"sigs.k8s.io/kustomize/api/resid"
 	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
 	resmaptest_test "sigs.k8s.io/kustomize/api/testutils/resmaptest"
 	"sigs.k8s.io/kustomize/api/types"
 )
@@ -29,6 +27,7 @@ func TestRefVarTransformer(t *testing.T) {
 		description string
 		given       given
 		expected    expected
+		errMessage  string
 	}{
 		{
 			description: "var replacement in map[string]",
@@ -43,11 +42,9 @@ func TestRefVarTransformer(t *testing.T) {
 					{Gvk: resid.Gvk{Version: "v1", Kind: "ConfigMap"}, Path: "data/map"},
 					{Gvk: resid.Gvk{Version: "v1", Kind: "ConfigMap"}, Path: "data/slice"},
 					{Gvk: resid.Gvk{Version: "v1", Kind: "ConfigMap"}, Path: "data/interface"},
-					{Gvk: resid.Gvk{Version: "v1", Kind: "ConfigMap"}, Path: "data/nil"},
 					{Gvk: resid.Gvk{Version: "v1", Kind: "ConfigMap"}, Path: "data/num"},
 				},
-				res: resmaptest_test.NewRmBuilder(
-					t, resource.NewFactory(kunstruct.NewKunstructuredFactoryImpl())).
+				res: resmaptest_test.NewRmBuilderDefault(t).
 					Add(map[string]interface{}{
 						"apiVersion": "v1",
 						"kind":       "ConfigMap",
@@ -62,7 +59,7 @@ func TestRefVarTransformer(t *testing.T) {
 								"item4": "$(BAZ)+$(BAZ)",
 								"item5": "$(BOO)",
 								"item6": "if $(BOO)",
-								"item7": 2019,
+								"item7": int64(2019),
 							},
 							"slice": []interface{}{
 								"$(FOO)",
@@ -73,13 +70,11 @@ func TestRefVarTransformer(t *testing.T) {
 								"if $(BOO)",
 							},
 							"interface": "$(FOO)",
-							"nil":       nil,
-							"num":       2019,
+							"num":       int64(2019),
 						}}).ResMap(),
 			},
 			expected: expected{
-				res: resmaptest_test.NewRmBuilder(
-					t, resource.NewFactory(kunstruct.NewKunstructuredFactoryImpl())).
+				res: resmaptest_test.NewRmBuilderDefault(t).
 					Add(map[string]interface{}{
 						"apiVersion": "v1",
 						"kind":       "ConfigMap",
@@ -94,7 +89,7 @@ func TestRefVarTransformer(t *testing.T) {
 								"item4": "5+5",
 								"item5": true,
 								"item6": "if true",
-								"item7": 2019,
+								"item7": int64(2019),
 							},
 							"slice": []interface{}{
 								"replacementForFoo",
@@ -105,12 +100,63 @@ func TestRefVarTransformer(t *testing.T) {
 								"if true",
 							},
 							"interface": "replacementForFoo",
-							"nil":       nil,
-							"num":       2019,
+							"num":       int64(2019),
 						}}).ResMap(),
 				unused: []string{"BAR"},
 			},
 		},
+		{
+			description: "var replacement panic in map[string]",
+			given: given{
+				varMap: map[string]interface{}{},
+				fs: []types.FieldSpec{
+					{Gvk: resid.Gvk{Version: "v1", Kind: "ConfigMap"}, Path: "data/slice"},
+				},
+				res: resmaptest_test.NewRmBuilderDefault(t).
+					Add(map[string]interface{}{
+						"apiVersion": "v1",
+						"kind":       "ConfigMap",
+						"metadata": map[string]interface{}{
+							"name": "cm1",
+						},
+						"data": map[string]interface{}{
+							"slice": []interface{}{5}, // noticeably *not* a []string
+						}}).ResMap(),
+			},
+			errMessage: `obj '{"apiVersion": "v1", "data": {"slice": [5]}, "kind": "ConfigMap", "metadata": {"name": "cm1"}}
+' at path 'data/slice': invalid value type expect a string`,
+		},
+		{
+			description: "var replacement in nil",
+			given: given{
+				varMap: map[string]interface{}{},
+				fs: []types.FieldSpec{
+					{Gvk: resid.Gvk{Version: "v1", Kind: "ConfigMap"}, Path: "data/nil"},
+				},
+				res: resmaptest_test.NewRmBuilderDefault(t).
+					Add(map[string]interface{}{
+						"apiVersion": "v1",
+						"kind":       "ConfigMap",
+						"metadata": map[string]interface{}{
+							"name": "cm1",
+						},
+						"data": map[string]interface{}{
+							"nil": nil, // noticeably *not* a []string
+						}}).ResMap(),
+			},
+			expected: expected{
+				res: resmaptest_test.NewRmBuilderDefault(t).
+					Add(map[string]interface{}{
+						"apiVersion": "v1",
+						"kind":       "ConfigMap",
+						"metadata": map[string]interface{}{
+							"name": "cm1",
+						},
+						"data": map[string]interface{}{
+							"nil": nil, // noticeably *not* a []string
+						}}).ResMap(),
+			},
+		},
 	}
 
 	for _, tc := range testCases {
@@ -122,16 +168,23 @@ func TestRefVarTransformer(t *testing.T) {
 			err := tr.Transform(tc.given.res)
 
 			// assert
-			if err != nil {
-				t.Errorf("unexpected error: %v", err)
-			}
+			if tc.errMessage != "" {
+				if err == nil {
+					t.Fatalf("missing expected error %v", tc.errMessage)
+				} else if err.Error() != tc.errMessage {
+					t.Fatalf("actual error doesn't match expected error: \nACTUAL: %v\nEXPECTED: %v", err.Error(), tc.errMessage)
+				}
+			} else {
+				if err != nil {
+					t.Errorf("unexpected error: %v", err)
+				}
 
-			a, e := tc.given.res, tc.expected.res
-			if !reflect.DeepEqual(a, e) {
-				err = e.ErrorIfNotEqualLists(a)
-				t.Fatalf("actual doesn't match expected: \nACTUAL:\n%v\nEXPECTED:\n%v\nERR: %v", a, e, err)
+				a, e := tc.given.res, tc.expected.res
+				if !reflect.DeepEqual(a, e) {
+					err = e.ErrorIfNotEqualLists(a)
+					t.Fatalf("actual doesn't match expected: \nACTUAL:\n%v\nEXPECTED:\n%v\nERR: %v", a, e, err)
+				}
 			}
-
 		})
 	}
 }

api/internal/accumulator/resaccumulator_test.go

@@ -12,7 +12,7 @@ import (
 
 	. "sigs.k8s.io/kustomize/api/internal/accumulator"
 	"sigs.k8s.io/kustomize/api/internal/plugins/builtinconfig"
-	"sigs.k8s.io/kustomize/api/k8sdeps/kunstruct"
+	"sigs.k8s.io/kustomize/api/provider"
 	"sigs.k8s.io/kustomize/api/resid"
 	"sigs.k8s.io/kustomize/api/resmap"
 	"sigs.k8s.io/kustomize/api/resource"
@@ -20,16 +20,14 @@ import (
 	"sigs.k8s.io/kustomize/api/types"
 )
 
-func makeResAccumulator(t *testing.T) (*ResAccumulator, *resource.Factory) {
+func makeResAccumulator(t *testing.T) *ResAccumulator {
 	ra := MakeEmptyAccumulator()
 	err := ra.MergeConfig(builtinconfig.MakeDefaultConfig())
 	if err != nil {
 		t.Fatalf("unexpected err: %v", err)
 	}
-	rf := resource.NewFactory(
-		kunstruct.NewKunstructuredFactoryImpl())
 	err = ra.AppendAll(
-		resmaptest_test.NewRmBuilder(t, rf).
+		resmaptest_test.NewRmBuilderDefault(t).
 			Add(map[string]interface{}{
 				"apiVersion": "apps/v1",
 				"kind":       "Deployment",
@@ -66,11 +64,11 @@ func makeResAccumulator(t *testing.T) (*ResAccumulator, *resource.Factory) {
 	if err != nil {
 		t.Fatalf("unexpected err: %v", err)
 	}
-	return ra, rf
+	return ra
 }
 
 func TestResolveVarsHappy(t *testing.T) {
-	ra, _ := makeResAccumulator(t)
+	ra := makeResAccumulator(t)
 	err := ra.MergeVars([]types.Var{
 		{
 			Name: "SERVICE_ONE",
@@ -99,7 +97,7 @@ func TestResolveVarsHappy(t *testing.T) {
 }
 
 func TestResolveVarsOneUnused(t *testing.T) {
-	ra, _ := makeResAccumulator(t)
+	ra := makeResAccumulator(t)
 	err := ra.MergeVars([]types.Var{
 		{
 			Name: "SERVICE_ONE",
@@ -140,11 +138,10 @@ func expectLog(t *testing.T, log bytes.Buffer, expect string) {
 }
 
 func TestResolveVarsVarNeedsDisambiguation(t *testing.T) {
-	ra, rf := makeResAccumulator(t)
-
+	ra := makeResAccumulator(t)
 	rm0 := resmap.New()
 	err := rm0.Append(
-		rf.FromMap(
+		provider.NewDefaultDepProvider().GetResourceFactory().FromMap(
 			map[string]interface{}{
 				"apiVersion": "v1",
 				"kind":       "Service",
@@ -213,8 +210,7 @@ func makeVarToNamepaceAndPath(
 }
 
 func TestResolveVarConflicts(t *testing.T) {
-	rf := resource.NewFactory(kunstruct.NewKunstructuredFactoryImpl())
-
+	rf := provider.NewDefaultDepProvider().GetResourceFactory()
 	// create configmaps in foo and bar namespaces with `data.provider` values.
 	fooAws := makeNamespacedConfigMapWithDataProviderValue("foo", "aws")
 	barAws := makeNamespacedConfigMapWithDataProviderValue("bar", "aws")
@@ -261,7 +257,7 @@ func TestResolveVarConflicts(t *testing.T) {
 }
 
 func TestResolveVarsGoodResIdBadField(t *testing.T) {
-	ra, _ := makeResAccumulator(t)
+	ra := makeResAccumulator(t)
 	err := ra.MergeVars([]types.Var{
 		{
 			Name: "SERVICE_ONE",
@@ -286,7 +282,7 @@ func TestResolveVarsGoodResIdBadField(t *testing.T) {
 }
 
 func TestResolveVarsUnmappableVar(t *testing.T) {
-	ra, _ := makeResAccumulator(t)
+	ra := makeResAccumulator(t)
 	err := ra.MergeVars([]types.Var{
 		{
 			Name: "SERVICE_THREE",
@@ -310,7 +306,7 @@ func TestResolveVarsUnmappableVar(t *testing.T) {
 }
 
 func TestResolveVarsWithNoambiguation(t *testing.T) {
-	ra1, rf := makeResAccumulator(t)
+	ra1 := makeResAccumulator(t)
 	err := ra1.MergeVars([]types.Var{
 		{
 			Name: "SERVICE_ONE",
@@ -327,7 +323,7 @@ func TestResolveVarsWithNoambiguation(t *testing.T) {
 	// Create another accumulator having a resource with different prefix
 	ra2 := MakeEmptyAccumulator()
 
-	m := resmaptest_test.NewRmBuilder(t, rf).
+	m := resmaptest_test.NewRmBuilderDefault(t).
 		Add(map[string]interface{}{
 			"apiVersion": "apps/v1",
 			"kind":       "Deployment",

api/internal/conflict/factory.go

@@ -0,0 +1,23 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package conflict
+
+import (
+	"sigs.k8s.io/kustomize/api/resid"
+	"sigs.k8s.io/kustomize/api/resource"
+)
+
+type cdFactory struct{}
+
+var _ resource.ConflictDetectorFactory = &cdFactory{}
+
+// NewFactory returns a new conflict detector factory.
+func NewFactory() resource.ConflictDetectorFactory {
+	return &cdFactory{}
+}
+
+// New returns an instance of smPatchMergeOnlyDetector.
+func (c cdFactory) New(_ resid.Gvk) (resource.ConflictDetector, error) {
+	return &smPatchMergeOnlyDetector{}, nil
+}

api/internal/conflict/smpatchmergeonlydetector.go

@@ -0,0 +1,28 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package conflict
+
+import (
+	"sigs.k8s.io/kustomize/api/resource"
+)
+
+// smPatchMergeOnlyDetector ignores conflicts,
+// but does real strategic merge patching.
+// This is part of an effort to eliminate dependence on
+// apimachinery package to allow kustomize integration
+// into kubectl (#2506 and #1500)
+type smPatchMergeOnlyDetector struct{}
+
+var _ resource.ConflictDetector = &smPatchMergeOnlyDetector{}
+
+func (c *smPatchMergeOnlyDetector) HasConflict(
+	_, _ *resource.Resource) (bool, error) {
+	return false, nil
+}
+
+func (c *smPatchMergeOnlyDetector) MergePatches(
+	r, patch *resource.Resource) (*resource.Resource, error) {
+	err := r.ApplySmPatch(patch)
+	return r, err
+}