.github/workflows/auto-release.yaml

# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Github action job to test core java library features on
# downstream client libraries before they are released.
on:
  pull_request:
name: auto-release
jobs:
  approve:
    runs-on: ubuntu-latest
    if: contains(github.head_ref, 'release-please')
    steps:
    - uses: actions/github-script@v6
      with:
        github-token: ${{secrets.YOSHI_APPROVER_TOKEN}}
        debug: true
        script: |
          // only approve PRs from release-please[bot]
          if (context.payload.pull_request.user.login !== "release-please[bot]") {
            return;
          }

          // only approve PRs like "chore(main): release <release version>"
          if (  !context.payload.pull_request.title.startsWith("chore(main): release") ) {
            return;
          }

          // only approve PRs with pom.xml and versions.txt changes
          const filesPromise = github.rest.pulls.listFiles.endpoint({
            owner: context.repo.owner,
            repo: context.repo.repo,
            pull_number: context.payload.pull_request.number,
          });
          const changed_files = await github.paginate(filesPromise)

          if ( changed_files.length < 1 ) {
            console.log( "Not proceeding since PR is empty!" )
            return;
          }

          if ( !changed_files.some(v => v.filename.includes("pom")) || !changed_files.some(v => v.filename.includes("versions.txt")) ) {
            console.log( "PR file changes do not have pom.xml or versions.txt -- something is wrong. PTAL!" )
            return;
          }

          // trigger auto-release when
          // 1) it is a SNAPSHOT release (auto-generated post regular release)
          // 2) there are dependency updates only
          // 3) there are no open dependency update PRs in this repo (to avoid multiple releases)
          if (
            context.payload.pull_request.body.includes("Fix") ||
            context.payload.pull_request.body.includes("Build") ||
            context.payload.pull_request.body.includes("Documentation") ||
            context.payload.pull_request.body.includes("BREAKING CHANGES") ||
            context.payload.pull_request.body.includes("Features")
          ) {
            console.log( "Not auto-releasing since it is not a dependency-update-only release." );
            return;
          }

          const promise = github.rest.pulls.list.endpoint({
            owner: context.repo.owner,
            repo: context.repo.repo,
            state: 'open'
          });
          const open_pulls = await github.paginate(promise)

          if ( open_pulls.length > 1 && !context.payload.pull_request.title.includes("SNAPSHOT") ) {
            for ( const pull of open_pulls ) {
              if ( pull.title.startsWith("deps: update dependency") ) {
                console.log( "Not auto-releasing yet since there are dependency update PRs open in this repo." );
                return;
              }
            }
          }

          // approve release PR
          await github.rest.pulls.createReview({
            owner: context.repo.owner,
            repo: context.repo.repo,
            body: 'Rubber stamped release!',
            pull_number: context.payload.pull_request.number,
            event: 'APPROVE'
          });

          // attach kokoro:force-run and automerge labels
          await github.rest.issues.addLabels({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.payload.pull_request.number,
            labels: ['kokoro:force-run', 'automerge']
          });