output-code-coverage.yaml

name: Output Code Coverage
on:
  workflow_run:
    workflows: [Generate Code Coverage]
    types: [completed]
  
jobs:
  output-code-coverage:
    name: Output Code Coverage
    runs-on: ubuntu-latest
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    steps:
      # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#using-data-from-the-triggering-workflow
      - name: 'Download reports'
        uses: actions/github-script@v6
        with:
          script: |
            let fs = require('fs');
            let allArtifacts = await github.rest.actions.listWorkflowRunArtifacts({
              owner: context.repo.owner,
              repo: context.repo.repo,
              run_id: context.payload.workflow_run.id,
            });
            for (const artifact of allArtifacts.data.artifacts) {
              let download = await github.rest.actions.downloadArtifact({
                owner: context.repo.owner,
                repo: context.repo.repo,
                artifact_id: artifact.id,
                archive_format: 'zip',
              });
              fs.writeFileSync(`${process.env.GITHUB_WORKSPACE}/${artifact.id}.zip`, Buffer.from(download.data));
            }

      - name: 'Determine source PR'
        uses: potiuk/get-workflow-origin@v1_1
        id: source-run-info
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          sourceRunId: ${{ github.event.workflow_run.id }}

      - name: Set up go
        uses: actions/setup-go@v4
        with:
          go-version: '^1.20.2'

      - name: Install coverage tool
        run: go install k8s.io/test-infra/robots/coverage@latest

      - name: Generate comment
        id: generate-comment
        run: |
          unzip \*.zip
          echo 'comment<<EOF' >> $GITHUB_OUTPUT
          echo '<!-- pr-coverage -->' >> $GITHUB_OUTPUT
          echo '## Code Coverage Diff' >> $GITHUB_OUTPUT
          COVERAGE_DIFF=$(coverage diff base-coverage.out pr-coverage.out | sed -e '1,5d')
          if [[ -n "${COVERAGE_DIFF}" ]]; then
            printf -- "%s\n" "${COVERAGE_DIFF}" >> $GITHUB_OUTPUT
          else
            echo 'This PR does not change the code coverage' >> $GITHUB_OUTPUT
          fi
          echo 'EOF' >> $GITHUB_OUTPUT

      - name: Create or update comment
        uses: edumserrano/find-create-or-update-comment@v1
        with:
          issue-number: ${{ steps.source-run-info.outputs.pullRequestNumber }}
          body-includes: '<!-- pr-coverage -->'
          comment-author: 'github-actions[bot]'
          body: ${{ steps.generate-comment.outputs.comment }}
          edit-mode: replace