pr-comment-artifact-url.yml

# https://github.com/orgs/community/discussions/51403

name: Pull Request - Comment Artifact URL

on:
  workflow_run:
    types:
      - "completed"
    workflows:
      - "Pull Request - Artifact Upload"

jobs:
  comment-on-pr:
    if: github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    steps:

      - name: Get Artifact URL & PR Info
        env:
          GITHUB_TOKEN: ${{ github.token }}
          OWNER: ${{ github.repository_owner }}
          REPO: ${{ github.event.repository.name }}
          WORKFLOW_RUN_EVENT_OBJ: ${{ toJSON(github.event.workflow_run) }}
        run: |
          PREVIOUS_JOB_ID=$(jq -r '.id' <<< "$WORKFLOW_RUN_EVENT_OBJ")
          echo "Previous Job ID: $PREVIOUS_JOB_ID"
          echo "PREVIOUS_JOB_ID=$PREVIOUS_JOB_ID" >> "$GITHUB_ENV"
          
          SUITE_ID=$(jq -r '.check_suite_id' <<< "$WORKFLOW_RUN_EVENT_OBJ")
          echo "Previous Suite ID: $SUITE_ID"
          echo "SUITE_ID=$SUITE_ID" >> "$GITHUB_ENV"
          
          ARTIFACT_ID=$(gh api "/repos/$OWNER/$REPO/actions/artifacts" \
            --jq ".artifacts.[] |
            select(.workflow_run.id==${PREVIOUS_JOB_ID}) |
            select(.expired==false) |
            .id")
          
          echo "Artifact ID: $ARTIFACT_ID"
          echo "ARTIFACT_ID=$ARTIFACT_ID" >> "$GITHUB_ENV"
          
          PR_NUMBER=$(jq -r '.pull_requests[0].number' \
            <<< "$WORKFLOW_RUN_EVENT_OBJ")
          
          echo "Pull request Number: $PR_NUMBER"
          echo "PR_NUMBER=$PR_NUMBER" >> "$GITHUB_ENV"
          
          HEAD_SHA=$(jq -r '.pull_requests[0].head.sha' \
            <<< "$WORKFLOW_RUN_EVENT_OBJ")
          
          echo "Head SHA: $HEAD_SHA"
          echo "HEAD_SHA=$HEAD_SHA" >> "$GITHUB_ENV"

      # On an forked repo, pull_requests are empty above, making not being able to post a comment: https://github.com/orgs/community/discussions/25220#discussioncomment-7551168
      - name: Get PR ID`
        if: ${{ env.PR_NUMBER == '' ||  env.PR_NUMBER == 'null' }}
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: |
          PR_NUMBER=$(gh pr view -R "${{ github.repository }}" "${{ github.event.workflow_run.head_repository.owner.login }}:${{ github.event.workflow_run.head_branch }}" --json "number" --jq ".number")
          echo "Pull request Number (2nd method): $PR_NUMBER"
          echo "PR_NUMBER=$PR_NUMBER" >> "$GITHUB_ENV"

      - name: Find Comment
        uses: peter-evans/find-comment@v3
        id: find-comment
        with:
          issue-number: ${{ env.PR_NUMBER }}
          comment-author: 'github-actions[bot]'

      - name: Update Comment
        env:
          JOB_PATH: "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ env.PREVIOUS_JOB_ID }}"
          ARTIFACT_URL: "https://nightly.link/${{ github.repository }}/suites/${{ env.SUITE_ID }}/artifacts/${{ env.ARTIFACT_ID }}"
          # HEAD_SHA: "${{ env.HEAD_SHA }}" # empty from a forked repo
          HEAD_SHA: "${{ github.event.workflow_run.head_sha }}"
        uses: peter-evans/create-or-update-comment@v4
        with:
          issue-number: ${{ env.PR_NUMBER }}
          comment-id: ${{ steps.find-comment.outputs.comment-id }}
          edit-mode: replace
          body: |-
            Build Successful! You can find a link to the downloadable artifact below.
            
            | Name     | Link                    |
            | -------- | ----------------------- |
            | Commit   | ${{ env.HEAD_SHA }}     |
            | Logs     | ${{ env.JOB_PATH }}     |
            | Download | ${{ env.ARTIFACT_URL }} |