backport.yaml

name: backport
on:
  pull_request_target:
    types:
      - closed
      - labeled

jobs:
  backport_and_merge:
    runs-on: ubuntu-latest
    # Only react to merged PRs for security reasons.
    # See https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request_target.
    permissions:
      contents: write
      pull-requests: write
    if: |
      github.event.pull_request.merged && (
        github.event.action == 'closed' || (
          github.event.action == 'labeled' && contains(github.event.label.name, 'backport')
        )
      )
    steps:
      - name: backport PR
        uses: tibdex/backport@v2
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          title_template: "[AUTO-BACKPORT <%= base %>] <%= number %>: <%= title %>"
      
      - name: merge backported PR
        id: merge_backport_pr
        if: success()
        run: |
            PR_NUMBER=$(gh pr list --repo ${{ github.repository }} --search "[AUTO-BACKPORT release-[0-9.]+ ] ${{ github.event.pull_request.number }}" --json number --jq '.[0].number')
            if [ -n "$PR_NUMBER" ]; then
              tools/scripts/track-pr pr-${{ github.event.action }} "$PR_NUMBER"
              gh pr merge $PR_NUMBER --merge --repo ${{ github.repository }} --admin -t "Auto-merged backport PR."
            else
              echo "No backport PR found to merge."
            fi
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}