kyverno-checks.yaml

name: Check Kyverno manifests
on:
  pull_request:
    branches:
      - master

jobs:
  check-for-kyverno:
    runs-on: ubuntu-latest
    outputs:
      kyverno-found: ${{ steps.kyverno-check.outputs.found }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          # Fetch both the merge commit GitHub generates for the pull request
          # and both its parents, i.e. the tip of the branch and the tip of master
          fetch-depth: 2
      - name: Get list of changed files
        id: changed-files
        run: |
          echo "changed-files=$(git diff --name-only --diff-filter=d HEAD^1 HEAD)" | \
            while IFS= read -r line; do printf 'changed-files=%q\n' "$line"; done >> "$GITHUB_OUTPUT"
      - name: Check for kyverno in changed files
        id: kyverno-check
        run: |
          files=$(echo "${{ steps.changed-files.outputs.changed-files }}" | tr ',' '\n')
          echo "changed-files $files"
          for file in "${files}"; do
            echo ${file}
            if [[ "${file}" == *"kyverno"* ]]; then
              echo "Kyverno files changed: ${file}"
              echo "::set-output name=found::true"
              exit 0
            fi
          done
          echo "No Kyverno files changed"
          echo "::set-output name=found::false"

  compare-with-upstream:
    needs: check-for-kyverno
    if: needs.check-for-kyverno.outputs.kyverno-found == 'true'
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: ./kyverno//
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        # with:
      - name: install `kustomize-build-dirs`
        run: |
          curl \
            --location \
            --silent \
            https://github.com/utilitywarehouse/manifest-checkers/releases/download/v0.1.0/manifest-checkers_Linux_x86_64.tar.gz \
          | tar \
            --directory /usr/local/bin \
            --extract \
            --gzip \
            --file - \
            kustomize-build-dirs \
      - name: Ensure Kustomize
        run: >-
          command -v kustomize ||
          curl --silent --location https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv5.2.1/kustomize_v5.2.1_linux_amd64.tar.gz |
          tar zx -C /usr/local/bin
      - name: Run `kustomize build`
        run: |
          set -o pipefail

          mkdir built-manifests/
          kustomize build deploy/ | yq eval "select(.kind != \"CustomResourceDefinition\")" > built-manifests/manifest1.yaml
      - name: Update upsteam manifest
        run: |
          make get-upstream
      - name: Run `kustomize build` with updated upstream
        run: |
          set -o pipefail

          kustomize build deploy/ | yq eval "select(.kind != \"CustomResourceDefinition\")" > built-manifests/manifest2.yaml
      - name: Compare both manifests
        id: diff
        run: |
          diff_output="$(diff built-manifests/manifest1.yaml built-manifests/manifest2.yaml)" || true
          if [ -n "$diff_output" ]
          then
            echo "diff-output<<EOF" >> "$GITHUB_OUTPUT"
            awk -v max_length=25000 '{len+=length(); print} len >= max_length {exit(0)}' <<< "${diff_output}" >> "$GITHUB_OUTPUT"
            echo -e "\n=============================================" >> "$GITHUB_OUTPUT"
            if [[ ${#diff_output} -gt 25000 ]]
            then
              echo -e "(Diff output is truncated to 25000 characters)" >> "$GITHUB_OUTPUT"
            fi
            echo "EOF" >> "$GITHUB_OUTPUT"
          fi
      - name: Diff as PR comment
        if: steps.diff.outputs.diff-output != ''
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          header: k8s-diff
          recreate: true
          message: |
            Post `kustomize build` diff:

            ```diff
            ${{ steps.diff.outputs.diff-output }}
            ```