Bot: Comment on the Pull Request #3
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| name: "Bot: Comment on the Pull Request" | |
| # read-write repo token | |
| # access to secrets | |
| on: | |
| workflow_run: | |
| workflows: ["Receive Pull Request"] | |
| types: | |
| - completed | |
| concurrency: | |
| group: pr-${{ github.event.workflow_run.pull_requests[0].number }} | |
| cancel-in-progress: true | |
| jobs: | |
| # Pull requests are valid if: | |
| # - they match the sha of the workflow run head commit | |
| # - they are open | |
| # - no .github files were committed | |
| test-pr: | |
| name: "Test if pull request is valid" | |
| runs-on: ubuntu-latest | |
| if: > | |
| github.event.workflow_run.event == 'pull_request' && | |
| github.event.workflow_run.conclusion == 'success' | |
| outputs: | |
| is_valid: ${{ steps.check-pr.outputs.VALID }} | |
| payload: ${{ steps.check-pr.outputs.payload }} | |
| number: ${{ steps.get-pr.outputs.NUM }} | |
| msg: ${{ steps.check-pr.outputs.MSG }} | |
| steps: | |
| - name: 'Download PR artifact' | |
| id: dl | |
| uses: carpentries/actions/download-workflow-artifact@main | |
| with: | |
| run: ${{ github.event.workflow_run.id }} | |
| name: 'pr' | |
| - name: "Get PR Number" | |
| if: ${{ steps.dl.outputs.success == 'true' }} | |
| id: get-pr | |
| run: | | |
| unzip pr.zip | |
| echo "NUM=$(<./NR)" >> $GITHUB_OUTPUT | |
| - name: "Fail if PR number was not present" | |
| id: bad-pr | |
| if: ${{ steps.dl.outputs.success != 'true' }} | |
| run: | | |
| echo '::error::A pull request number was not recorded. The pull request that triggered this workflow is likely malicious.' | |
| exit 1 | |
| - name: "Get Invalid Hashes File" | |
| id: hash | |
| run: | | |
| echo "json<<EOF | |
| $(curl -sL https://files.carpentries.org/invalid-hashes.json) | |
| EOF" >> $GITHUB_OUTPUT | |
| - name: "Check PR" | |
| id: check-pr | |
| if: ${{ steps.dl.outputs.success == 'true' }} | |
| uses: carpentries/actions/check-valid-pr@main | |
| with: | |
| pr: ${{ steps.get-pr.outputs.NUM }} | |
| sha: ${{ github.event.workflow_run.head_sha }} | |
| headroom: 3 # if it's within the last three commits, we can keep going, because it's likely rapid-fire | |
| invalid: ${{ fromJSON(steps.hash.outputs.json)[github.repository] }} | |
| fail_on_error: true | |
| # Create an orphan branch on this repository with two commits | |
| # - the current HEAD of the md-outputs branch | |
| # - the output from running the current HEAD of the pull request through | |
| # the md generator | |
| create-branch: | |
| name: "Create Git Branch" | |
| needs: test-pr | |
| runs-on: ubuntu-latest | |
| if: ${{ needs.test-pr.outputs.is_valid == 'true' }} | |
| env: | |
| NR: ${{ needs.test-pr.outputs.number }} | |
| permissions: | |
| contents: write | |
| steps: | |
| - name: 'Checkout md outputs' | |
| uses: actions/checkout@v4 | |
| with: | |
| ref: md-outputs | |
| path: built | |
| fetch-depth: 1 | |
| - name: 'Download built markdown' | |
| id: dl | |
| uses: carpentries/actions/download-workflow-artifact@main | |
| with: | |
| run: ${{ github.event.workflow_run.id }} | |
| name: 'built' | |
| - if: ${{ steps.dl.outputs.success == 'true' }} | |
| run: unzip built.zip | |
| - name: "Create orphan and push" | |
| if: ${{ steps.dl.outputs.success == 'true' }} | |
| run: | | |
| cd built/ | |
| git config --local user.email "[email protected]" | |
| git config --local user.name "GitHub Actions" | |
| CURR_HEAD=$(git rev-parse HEAD) | |
| git checkout --orphan md-outputs-PR-${NR} | |
| git add -A | |
| git commit -m "source commit: ${CURR_HEAD}" | |
| ls -A | grep -v '^.git$' | xargs -I _ rm -r '_' | |
| cd .. | |
| unzip -o -d built built.zip | |
| cd built | |
| git add -A | |
| git commit --allow-empty -m "differences for PR #${NR}" | |
| git push -u --force --set-upstream origin md-outputs-PR-${NR} | |
| # Comment on the Pull Request with a link to the branch and the diff | |
| comment-pr: | |
| name: "Comment on Pull Request" | |
| needs: [test-pr, create-branch] | |
| runs-on: ubuntu-latest | |
| if: ${{ needs.test-pr.outputs.is_valid == 'true' }} | |
| env: | |
| NR: ${{ needs.test-pr.outputs.number }} | |
| permissions: | |
| pull-requests: write | |
| steps: | |
| - name: 'Download comment artifact' | |
| id: dl | |
| uses: carpentries/actions/download-workflow-artifact@main | |
| with: | |
| run: ${{ github.event.workflow_run.id }} | |
| name: 'diff' | |
| - if: ${{ steps.dl.outputs.success == 'true' }} | |
| run: unzip ${{ github.workspace }}/diff.zip | |
| - name: "Comment on PR" | |
| id: comment-diff | |
| if: ${{ steps.dl.outputs.success == 'true' }} | |
| uses: carpentries/actions/comment-diff@main | |
| with: | |
| pr: ${{ env.NR }} | |
| path: ${{ github.workspace }}/diff.md | |
| # Comment if the PR is open and matches the SHA, but the workflow files have | |
| # changed | |
| comment-changed-workflow: | |
| name: "Comment if workflow files have changed" | |
| needs: test-pr | |
| runs-on: ubuntu-latest | |
| if: ${{ always() && needs.test-pr.outputs.is_valid == 'false' }} | |
| env: | |
| NR: ${{ github.event.workflow_run.pull_requests[0].number }} | |
| body: ${{ needs.test-pr.outputs.msg }} | |
| permissions: | |
| pull-requests: write | |
| steps: | |
| - name: 'Check for spoofing' | |
| id: dl | |
| uses: carpentries/actions/download-workflow-artifact@main | |
| with: | |
| run: ${{ github.event.workflow_run.id }} | |
| name: 'built' | |
| - name: 'Alert if spoofed' | |
| id: spoof | |
| if: ${{ steps.dl.outputs.success == 'true' }} | |
| run: | | |
| echo 'body<<EOF' >> $GITHUB_ENV | |
| echo '' >> $GITHUB_ENV | |
| echo '## :x: DANGER :x:' >> $GITHUB_ENV | |
| echo 'This pull request has modified workflows that created output. Close this now.' >> $GITHUB_ENV | |
| echo '' >> $GITHUB_ENV | |
| echo 'EOF' >> $GITHUB_ENV | |
| - name: "Comment on PR" | |
| id: comment-diff | |
| uses: carpentries/actions/comment-diff@main | |
| with: | |
| pr: ${{ env.NR }} | |
| body: ${{ env.body }} | |