rerun-compare-chromium-versions.yml

name: Rerun Compare Chromium versions

on:
  pull_request:
    branches:
      - master
      - '[0-9]+.[0-9]+.x'
## TODO: If a PR touches >300 files, this filter may prevent the workflow from being executed (https://github.com/orgs/community/discussions/57830)
#    paths:
#      - package.json
    types:
      - closed

jobs:
  rerun-compare-chromium-versions:
## TODO: Temporary workaround for the above issue
#    if: github.event.pull_request.merged == true
    if: github.event.pull_request.merged == true && startsWith(github.head_ref, 'cr1')
    runs-on: ubuntu-latest
    env:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      PR_SHA: ${{ github.event.pull_request.head.sha }}
      # TODO: This is the sha where the PR branched off, so not really what we want, but there seems to be no easy way to get the last pre-merge sha without a checkout
      TARGET_SHA: ${{ github.event.pull_request.base.sha }}
    steps:
      - name: If a major Chromium bump was merged, rerun compare-chromium-versions in all PRs targeting the same branch
        run: |
          shopt -s inherit_errexit
          set -eEo pipefail

          chromium_ver() {
              gh api -H "Accept: application/vnd.github.raw+json" "https://api.github.com/repos/${GITHUB_REPOSITORY:?}/contents/package.json?ref=${1:?}"|jq -r .config.projects.chrome.tag
          }

          pr_ver="$(chromium_ver "${PR_SHA:?}")"
          target_ver="$(chromium_ver "${TARGET_SHA:?}")"

          echo "::notice::PR branch: ${GITHUB_HEAD_REF:?} (${pr_ver:?}), target branch: ${GITHUB_BASE_REF:?} (${target_ver:?})"

          if [[ "${pr_ver%%.*}" != "${target_ver%%.*}" ]]; then
              echo "::notice::Rerunning compare-chromium-versions in PRs targeting ${GITHUB_BASE_REF:?}"
              while read -r pr_number head_sha; do
                  run_id="$(gh api "/repos/$GITHUB_REPOSITORY/actions/workflows/compare-chromium-versions.yml/runs?head_sha=${head_sha:?}" -q '.workflow_runs[0].id')"
                  pr_url="https://github.com/brave/brave-core/pull/${pr_number:?}"
                  if [[ "$run_id" ]]; then
                      echo "Rerunning $run_id for $pr_url"
                      # TODO: Workflows older than 30 days will fail to rerun (by design), let's filter them out (using `|| true` for now)
                      # https://docs.github.com/en/actions/managing-workflow-runs-and-deployments/managing-workflow-runs/re-running-workflows-and-jobs
                      gh -R "$GITHUB_REPOSITORY" run rerun "$run_id" || true
                  else
                      echo "No run found for $pr_url"
                  fi
                  sleep 1
              done < <(gh -R "$GITHUB_REPOSITORY" pr list --limit 1000 --state open --base "$GITHUB_BASE_REF" --json number,headRefOid -q '.[]|"\(.number)\t\(.headRefOid)"')
          else
              echo "::notice::Chromium major versions match, nothing to do"
          fi