buildifier.yaml

name: Buildifier

# Runs buildifier over all Starlark/BUILD files on a daily schedule and opens a
# PR only if the formatter produced changes. Mirrors the ktfmt format cron: it
# force-pushes a dedicated, bot-owned branch so re-runs reuse one PR instead of
# accumulating stale branches, and it never touches master directly.
#
# Pinned to the repo's .bazelversion (no USE_BAZEL_VERSION) and run with
# --lockfile_mode=off so MODULE.bazel.lock is never rewritten — that keeps the
# generated PR limited to formatting-only changes.
on:
  schedule:
    # 12:30 UTC daily (between the ktfmt format and coverage-badge crons).
    - cron: '30 12 * * *'
  workflow_dispatch:

jobs:
  buildifier:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    steps:
      - name: Setup Java JDK
        uses: actions/setup-java@v4
        with:
          distribution: 'temurin'
          java-version: '21'
      - name: Setup Go environment
        uses: actions/setup-go@v5
        with:
          go-version: ^1.17
        id: go
      - name: Setup Bazelisk
        run: go install github.com/bazelbuild/bazelisk@latest && export PATH=$PATH:$(go env GOPATH)/bin
      - uses: actions/checkout@v4
      - name: Run buildifier
        run: ~/go/bin/bazelisk run //cli/format:buildifier --enable_bzlmod=true --enable_workspace=false --lockfile_mode=off
      - name: Open PR if formatting changed
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          if [ -z "$(git status --porcelain)" ]; then
            echo "No buildifier changes; nothing to do."
            exit 0
          fi
          BRANCH="ci/buildifier-format"
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git checkout -B "$BRANCH"
          git add -A
          git commit -m "ci: apply buildifier formatting"
          # Force-push the dedicated, bot-owned branch so re-runs reuse one PR
          # instead of accumulating stale branches. This never touches master.
          git push --force origin "$BRANCH"
          if gh pr view "$BRANCH" --json state --jq '.state' 2>/dev/null | grep -q OPEN; then
            echo "PR already open for $BRANCH; it now points at the latest formatting."
          else
            gh pr create \
              --base master \
              --head "$BRANCH" \
              --title "ci: apply buildifier formatting" \
              --body "Automated buildifier run via \`bazel run //cli/format:buildifier\`. This PR contains formatting-only changes to BUILD/Starlark files."
          fi