Initial commit.

Author: swade1987

Diff for: Dockerfile

@@ -0,0 +1,16 @@
+FROM alpine:3.14.3
+
+RUN apk add --no-cache \
+  curl \
+  bash \
+  git \
+  && rm -rf /var/cache/apk/*
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+RUN curl -sL https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv3.8.7/kustomize_v3.8.7_linux_amd64.tar.gz \
+  | tar xz -C /usr/local/bin 
+
+COPY kustdiff /kustdiff
+
+ENTRYPOINT ["/kustdiff"]

Diff for: README.md

@@ -1 +1,43 @@
-# github-action-kustomize-diff
+# GitHub Action for kustomize-diff
+
+This [action](https://help.github.com/en/actions) can be used in any repository that uses [kustomize](https://kustomize.io/).
+
+# Summary
+
+The steps the action takes are as follows:
+
+- Store the output of `kustomize build` (for each environment) on the current branch in a temporary location.
+- Store the output of `kustomize build` (for each environment) on the master branch in a temporary location.
+- Based on the two outputs above it performs a git diff and stores the output in a variable called `escaped_output`.
+
+This action can be combined with [unsplash/comment-on-pr](https://github.com/unsplash/comment-on-pr) to comment the output to the PR. 
+
+# Example configuration
+
+The below example will run `kustomize-diff` against your branch and commit the changes due to be applied back to your Pull Request.
+
+```
+name: kustomize-diff
+on:
+  pull_request:
+    paths:
+      - 'kustomize/**'
+
+jobs:
+  kustomize-diff:
+    runs-on: ubuntu-latest
+    steps:
+      - id: checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - id: kustomize-diff
+        uses: swade1987/github-action-kustomize-diff@master
+      - id: comment
+        uses: unsplash/comment-on-pr@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          msg: ${{ steps.kustomize-diff.outputs.diff }}
+          check_for_duplicate_msg: false
+```

Diff for: action.yml

@@ -0,0 +1,25 @@
+name: "kustomize-diff"
+description: "Kustomize build head and base of PR, add diff as comment"
+inputs:
+  base_ref:
+    description: "Ref for PR base"
+    required: true
+    default: ${{ github.base_ref }}
+  head_ref:
+    description: "Ref for PR head"
+    required: true
+    default: ${{ github.head_ref }}
+  pr_num:
+    description: "PR number / ID"
+    required: true
+    default: ${{ github.event.number }}
+  token:
+    description: "Token for GitHub authentication"
+    required: true
+    default: ${{ github.token }}
+outputs:
+  diff:
+    description: "Diff between kustomize built head and base"
+runs:
+  using: "docker"
+  image: "Dockerfile"

Diff for: kustdiff

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+set -eux
+
+TMP_DIR="$(mktemp -d)"
+
+function get_targets {
+  find . -maxdepth 3 -name kustomization.yaml -exec dirname {} \;
+  find . -mindepth 4 -maxdepth 4 -name kustomization.yaml -exec dirname {} \; | sort | uniq | grep variant
+}
+
+function build {
+  local ref="$1"
+  printf "\n\nChecking out ref: %s\n" "$ref"
+  git checkout "$ref" --quiet
+  for envpath in $(get_targets); do
+    local build_dir
+    if ! [ -d "$envpath" ]; then continue; fi
+    build_dir="$TMP_DIR/$ref/${envpath#*kustomize/}"
+    printf "\n\nCreating build directory: %s\n" "$build_dir"
+    mkdir -p "$build_dir"
+    echo "Running kustomize"
+    kustomize build "$envpath" -o "$build_dir"
+  done
+}
+
+function main {
+  local diff escaped_output output
+  build "$INPUT_HEAD_REF"
+  build "$INPUT_BASE_REF"
+  set +e
+  diff=$(git diff --no-index "$TMP_DIR/$INPUT_BASE_REF" "$TMP_DIR/$INPUT_HEAD_REF")
+  set -e
+  output=$(printf "\`\`\` diff\n%s\n\`\`\`\n" "$diff")
+  escaped_output=${output//$'\n'/'%0A'}
+  echo "::set-output name=diff::$escaped_output"
+  printf "\n\nOutput: %s\n" "$escaped_output"
+}
+
+main