post-merge.yml

# Workflow that runs after a merge to master, analyses changes in test executions
# and posts the result to the merged PR.

name: Post merge analysis

on:
  push:
    branches:
      - master

jobs:
  analysis:
    runs-on: ubuntu-24.04
    if: github.repository == 'rust-lang/rust'
    permissions:
      pull-requests: write
    steps:
      - uses: actions/checkout@v4
      - name: Perform analysis and send PR
        run: |
          # Get closest bors merge commit
          PARENT_COMMIT=`git rev-list --author='bors <bors@rust-lang.org>' -n1 --first-parent HEAD^1`

          # Find PR for the current commit
          HEAD_PR=`gh pr list --search "${{ github.sha }}" --state merged --json number --jq '.[0].number'`

          echo "Parent: ${PARENT_COMMIT}"
          echo "HEAD: ${{ github.sha }} (#${HEAD_PR})"

          cd src/ci/citool

          echo "Post-merge analysis result" > output.log
          cargo run --release post-merge-analysis ${PARENT_COMMIT} ${{ github.sha }} >> output.log
          cat output.log

          gh pr comment ${HEAD_PR} -F output.log