pr_review.yml

name: PR review status
permissions: read-all
on:
  pull_request_review:
    types: [submitted]

jobs:
  # We require a single commit, but only after the review process is complete
  # and the PR has an Approval. This fails if there are multiple commits and the
  # PR is approved. Otherwise, the PR is ready for internal migration, the
  # maintainer may apply the the `pull ready` label.
  require-single-commit-on-approval:
    if: ${{ github.event.review.state == 'approved' }}
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository code
        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # pin@v3

      - name: Assert single commit
        env:
          commits: ${{ github.event.pull_request.commits }}
        run: |
          if (( commits > 1 )); then
            echo "::error::Expected approved PR to have a single commit, but found $commits. google/heir requires a single commit per PR because Google's internal/external synchronization tooling does not support squashing, and instead would rebase all commits into the main branch."
            exit 1
          fi