PR Watcher #39121
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| # Workflow that runs periodically to check whether PRs have been imported into | |
| # Gerrit and if they have been merged. The workflow adds a PR comment after | |
| # import and after merge. PRs that are merged upstream are then closed. | |
| name: PR Watcher | |
| on: | |
| workflow_dispatch: | |
| schedule: | |
| - cron: "*/10 * * * *" # Every 10 minutes | |
| jobs: | |
| check: | |
| name: Check Copybara Import Status | |
| runs-on: ubuntu-latest | |
| permissions: | |
| actions: write | |
| steps: | |
| - name: Check Pull Requests | |
| uses: actions/github-script@v6 | |
| with: | |
| script: | | |
| // Get all open PRs. | |
| const pulls = await github.rest.pulls.list({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| state: 'open', | |
| base: 'main', | |
| }); | |
| for (const pull of pulls.data) { | |
| const query = `query($owner:String!, $name:String!, $pullNumber:Int!, $statusContext:String!) { | |
| repository(owner:$owner, name:$name) { | |
| pullRequest(number:$pullNumber) { | |
| commits(last:1) { | |
| nodes { | |
| commit { | |
| status { | |
| context(name: $statusContext) { | |
| state | |
| targetUrl | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| }`; | |
| // Query the import/copybara status check. | |
| const result = await github.graphql(query, { | |
| owner: context.repo.owner, | |
| name: context.repo.repo, | |
| pullNumber: pull.number, | |
| statusContext: 'import/copybara', | |
| }); | |
| const nodes = result.repository.pullRequest.commits.nodes; | |
| const commit = nodes[0].commit; | |
| if (commit && commit.status && commit.status.context) { | |
| // Forward the status check information to the pr-manager workflow. | |
| await github.rest.actions.createWorkflowDispatch({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| ref: 'main', | |
| workflow_id: 'pr-manager.yml', | |
| inputs: { | |
| pullNumber: pull.number.toString(), | |
| state: commit.status.context.state, | |
| targetUrl: commit.status.context.targetUrl, | |
| }, | |
| }); | |
| } | |
| // Look through all timeline events on the PR. | |
| // When the PR is merged upstream, it will include a backreference back to | |
| // the PR in the commit message. | |
| const timeline = github.paginate.iterator(github.rest.issues.listEventsForTimeline, { | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: pull.number, | |
| }); | |
| for await (const { data: timelineData } of timeline) { | |
| for (const timelineItem of timelineData) { | |
| if (timelineItem.event === 'referenced' && timelineItem.commit_id) { | |
| try { | |
| // Compare commit ids against refs/heads/main to see if they are | |
| // included in the main branch. | |
| const compare = await github.rest.repos.compareCommitsWithBasehead({ | |
| basehead: `${timelineItem.commit_id}...refs/heads/main`, | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| }); | |
| if (compare.data.status == "ahead" || compare.data.status == "identical") { | |
| // This is a commit that has already been merged into main. | |
| const commit = await github.rest.repos.getCommit({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| ref: timelineItem.commit_id, | |
| }); | |
| const message = commit.data.commit.message; | |
| const lines = message.split('\n'); | |
| for (const line of lines) { | |
| // Check if the commit has a footer referencing a PR. | |
| const tag = 'GITHUB_PR_HEAD_SHA='; | |
| if (line.startsWith(tag)) { | |
| const sha = line.slice(tag.length); | |
| // The merged commit footer matches the PR sha. | |
| if (pull.head.sha === sha) { | |
| // Close the PR. | |
| await github.rest.actions.createWorkflowDispatch({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| ref: 'main', | |
| workflow_id: 'pr-manager.yml', | |
| inputs: { | |
| pullNumber: pull.number.toString(), | |
| state: 'merged', | |
| targetUrl: commit.data.html_url, | |
| }, | |
| }); | |
| } | |
| } | |
| } | |
| } | |
| } catch (err) { | |
| // This is OK because not all commits will be comparable. | |
| console.warn(err); | |
| } | |
| } | |
| } | |
| } | |
| } |