Scripts for adding psuedo modules

psuedo modules will contain modules copied from k8s where we cannot depend directly on the k8s modules

.travis.yml

@@ -34,6 +34,8 @@ before_install:
 install: true
 
 script:
+# TODO(pwittrock): Enable this once the psuedo deps have been created
+#  - ./travis/verify-deps.sh
   - ./travis/pre-commit.sh
   - ./travis/kyaml-pre-commit.sh
 

pseudo/README.md

@@ -0,0 +1,46 @@
+# Pseudo Modules
+
+This package contains dependencies copied from kubernetes/kubernetes repos which
+are synced out of staging.
+
+The long term plan is to move off of the staging libraries entirely in favor of
+more suitable libraries developed in the Kustomize repo.
+
+## Why?
+
+1. Vendoring the Kustomize API in other tools
+
+The Kubernetes staging packages do not have stable APIs, and frequently break compatibility.
+This makes it difficult for other tools to vendor the Kustomize APIs, as they may depend
+on incompatible versions of the staging APIs.  By forking the staging libraries, we
+ensure that we are using our own copy which will not conflict with other versions.
+
+2. Vendoring into kubectl
+
+Packages that depend upon staging may not be vendored into kubernetes/kubernetes.  By forking
+the staging packages, we break this circular dependency so that the kustomize packages may
+be vendored into kubernetes/kubernetes without depending on code originating out of
+kubernetes/kubernetes.
+
+## Who?
+
+While it is possible to depend upon them from modules outside the Kustomize repository,
+there is not guarantee that this will continue to work in the future.
+
+The pseudo modules may be removed at anytime in the future without warning and no
+support will be given for these modules.
+
+## How?
+
+These libraries were forked by running `git clone` to clone the repos.
+
+### Automated Creation Steps
+
+1. Remove the current existing psuedo modules
+  - `$ rm -rf psuedo/k8s`
+2. Run the [fork-packages.sh](fork-packages.sh) script to clone and configure pseudo deps
+  - `$ psuedo/fork-packages.sh`
+
+### Using the Pseudo Modules in Kustomize
+
+TODO(pwittrock): Write this once it has been done successfully

pseudo/init-pseudo-module.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+set -e
+set -o xtrace
+
+function clonePseudoRepo {
+  git clone -b kubernetes-1.16.2 --depth 1 \
+    https://github.com/kubernetes/$1.git
+  rm -rf $1/.git
+  find $1 -name go.mod | xargs rm
+  find $1 -name go.sum | xargs rm
+  find $1 -name OWNERS | xargs rm
+}
+
+function replacePseudoModuleName {
+  find . -name *.go | xargs sed -i -e "s!k8s.io/$1!sigs.k8s.io/kustomize/pseudo/k8s/$1!g"
+  find . -name *.proto | xargs sed -i -e "s!k8s.io/$1!sigs.k8s.io/kustomize/pseudo/k8s/$1!g"
+}
+
+function checkForForbiddenModules {
+    if find . -name '*.go' | xargs grep "k8s.io/$1" ; then
+      echo "forbidden dep k8s.io/$1 in *.go"
+      exit 1
+    fi
+    if find . -name 'go.*' | xargs grep "k8s.io/$1" ; then
+      echo "forbidden dep k8s.io/$1 in go.*"
+      exit 1
+    fi
+}
+
+# make sure we are running in the right spot
+if [ ! -d "pseudo" ]; then
+  echo "must run script from kustomize root dir"
+  exit 1
+fi
+cd pseudo
+
+# make the k8s deps dir
+if [ -d "k8s" ]; then
+  echo "must remove existing k8s dir"
+  exit 1
+fi
+mkdir k8s
+
+cd k8s
+go mod init sigs.k8s.io/kustomize/pseudo/k8s
+
+# setup the correct set of dependencies -- copied from the client-go repo
+go mod edit \
+  -require=github.com/google/go-cmp@v0.3.1 \
+  -require=github.com/google/gofuzz@v1.0.0 \
+  -require=github.com/google/uuid@v1.1.1 \
+  -require=github.com/imdario/mergo@v0.3.5 \
+  -require=github.com/json-iterator/go@v1.1.8 \
+  -require=github.com/modern-go/reflect2@v1.0.1 \
+	-require=golang.org/x/crypto@v0.0.0-20190308221718-c2843e01d9a2 \
+  -require=golang.org/x/net@v0.0.0-20190620200207-3b0461eec859 \
+  -require=golang.org/x/oauth2@v0.0.0-20190604053449-0f29369cfe45 \
+  -require=golang.org/x/time@v0.0.0-20191024005414-555d28b269f0 \
+  -require=gopkg.in/yaml.v2@v2.2.4 \
+  -require=k8s.io/klog@v1.0.0 \
+  -require=k8s.io/kube-openapi@v0.0.0-20191107075043-30be4d16710a \
+  -require=k8s.io/utils@v0.0.0-20191030222137-2b95a09bc58d \
+  -require=sigs.k8s.io/yaml@v1.1.0
+
+# setup the correct set of dependencies -- copied from the client-go repo
+go mod edit \
+  -replace=golang.org/x/sys=golang.org/x/sys@v0.0.0-20190813064441-fde4db37ae7a \
+  -replace=golang.org/x/tools=golang.org/x/tools@v0.0.0-20190821162956-65e3620a7ae7
+
+# fetch the k8s packages
+for item in api apimachinery client-go
+do
+  clonePseudoRepo $item
+done
+
+# fixup the package names
+for item in api apimachinery client-go
+do
+  replacePseudoModuleName $item
+done
+
+# test the pseudo packages
+go test ./...
+
+# verify the package dependencies
+for item in api apimachinery client-go
+do
+  checkForForbiddenModules $item
+done

travis/verify-deps.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -o xtrace
+
+for item in api apimachinery client-go
+do
+  if find pseudo -name 'go.*' | xargs grep "k8s.io/${item}" ; then
+    echo "forbidden deps"
+    exit 1
+  fi
+  if find pseudo -name '*.go' | xargs grep "k8s.io/${item}" ; then
+    echo "forbidden deps"
+    exit 1
+  fi
+done
+