automated-prs-manager.yaml

name: Automated PRs Manager

on:
  # TODO NOW: remove pull_request and uncomment schedule
  pull_request:
  # schedule:
  #   - cron: "0 0 * * *"

jobs:
  list-prs:
    runs-on: ubuntu-latest
    outputs:
      prs: ${{ steps.list-prs.outputs.prs }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: List PRs
        id: list-prs
        env:
          GH_TOKEN: ${{ secrets.NIGHTLY_GH_PAT }}
        run: |
          set -euo pipefail

          # list dependabot and automated prs that are less than 24h old

          dependabot_prs=$(gh pr list --label dependabot --json url,headRefName,createdAt -q '.[] | select(.createdAt | fromdateiso8601 > now - 86400)')
          automated_prs=$(gh pr list --label automated-pr --json url,headRefName,createdAt -q '.[] | select(.createdAt | fromdateiso8601 > now - 86400)')
          prs=$(echo "$dependabot_prs" "$automated_prs" | jq -sc '. | unique')

          echo "prs=$prs" >> "$GITHUB_OUTPUT"

  process-prs:
    needs: list-prs
    runs-on: ubuntu-latest
    strategy:
      matrix:
        pr: ${{ fromJson(needs.list-prs.outputs.prs) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ matrix.pr.headRefName }}

      - name: Process PR
        env:
          GH_TOKEN: ${{ secrets.NIGHTLY_GH_PAT }}
        run: |
          set -euo pipefail

          echo "Ensuring required labels..."
          gh pr edit ${{ matrix.pr.url }} --add-label "type::security"

          echo "Checking status of tests..."
          run_id=$(gh run list --branch ${{ matrix.pr.headRefName }} --workflow build-test --limit 1 --json databaseId -q '.[0].databaseId')

          # If there are still pending jobs, skip.

          num_of_pending_jobs=$(gh run view $run_id --json jobs -q '.jobs[] | select(.conclusion == "") | .name' | wc -l)
          if [ $num_of_pending_jobs -gt 0 ]; then
            echo "There are still pending jobs. Skipping."
            exit 0
          fi

          # If all tests and required checks passed, approve and merge.

          if gh run view $run_id --json jobs -q '.jobs[] | select(.name == "validate-success") | .conclusion' | grep -q "success"; then
            if gh pr checks ${{ matrix.pr.url }} --required; then
              echo "All tests and required checks passed. Approving and merging."
              gh pr review --approve ${{ matrix.pr.url }} --body "LGTM :thumbsup:"
              gh pr merge --auto --squash ${{ matrix.pr.url }}
              exit 0
            else
              echo "All tests passed, but some required PR checks have not. Skipping."
              exit 0
            fi
          fi

          # If more than half of the validate-* jobs are successful, re-run the failed jobs.

          num_of_jobs=$(gh run view $run_id --json jobs -q '.jobs[] | select(.name | startswith("validate-")) | .name' | wc -l)
          num_of_successful_jobs=$(gh run view $run_id --json jobs -q '.jobs[] | select((.name | startswith("validate-")) and (.conclusion == "success")) | .name' | wc -l)

          if [ $num_of_successful_jobs -gt $((num_of_jobs / 2)) ]; then
            echo "More than half of the validate-* jobs are successful. Re-running failed jobs."
            gh run rerun $run_id --failed
            exit 0
          fi

          echo "Less than half of the validate-* jobs are successful. Skipping."