check-generated-artifacts.yml

name: Check Generated Artifacts
on:
  pull_request:
    types:
      - opened
      - reopened
      - synchronize

jobs:
  generated-artifacts:
    name: Check Generated Artifacts
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          ref: "${{ github.event.pull_request.head.sha }}"
          persist-credentials: false

      - name: Setup Go
        uses: actions/setup-go@v4
        with:
          go-version: '1.21'

      - name: Run the automatic generation
        working-directory: ./
        run: |
          make generate

      - name: Gather the differences
        id: git-diff
        run: |
          # Ensure new files are also considered in the diff
          git add --intent-to-add .

          output=$(git diff | head -n 100)
          exit_code=$([ "${output}" ] && echo 1 || echo 0)

          # Required to correctly manage multi-line outputs
          output="${output//'%'/'%25'}"
          output="${output//$'\n'/'%0A'}"
          output="${output//$'\r'/'%0D'}"

          # Store the different as step output
          echo "diff=${output}" >> $GITHUB_OUTPUT

          # Trigger a failure in case the diff is not empty
          exit ${exit_code}

      - name: Log the error if the diff is not empty (in case the comment cannot be generated)
        run: |
          echo "The generated artifacts appear to be out-of-date."
          echo
          echo "Here it is an excerpt of the diff:"
          echo "${{ steps.git-diff.outputs.diff }}"
        if: failure()

      - name: Issue a comment in case the diff is not empty
        uses: peter-evans/create-or-update-comment@v3
        with:
          token: ${{ secrets.CI_TOKEN }}
          issue-number: ${{ github.event.pull_request.number }}
          body: |
            The generated artifacts appear to be out-of-date.

            Please, ensure you are using the correct version of the generators (eg. `controller-gen`) and re-run:
            ```
            make generate
            ```

            <details>
              <summary>Here it is an excerpt of the diff:</summary>

              ```diff
              ${{ steps.git-diff.outputs.diff }}
              ```
            </details>
          reactions: confused
        if: |
          github.event_name != 'push' && failure() &&
          github.event.pull_request.head.repo.full_name == github.repository