Add automatic upmerge workflows to streamline branch maintenance

.github/workflows/upmerge-auto-comment.yml

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+name: Post Auto Upmerge Results
+
+on:
+  workflow_run:
+    workflows: ["Auto Upmerge"]
+    types: [completed]
+
+jobs:
+  post-upmerge-results:
+    runs-on: ubuntu-latest
+    if: always()
+    permissions:
+      contents: read
+      pull-requests: write
+      actions: read
+    steps:
+      - name: "Download Auto Upmerge Results"
+        uses: actions/download-artifact@v4
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+          pattern: "auto-upmerge-results-pr-*"
+          merge-multiple: true
+          path: artifacts/
+
+      - name: "Setup Python"
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.8"
+
+      - name: "Post Results Comment"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+          WORKFLOW_RUN_ID: ${{ github.event.workflow_run.id }}
+          WORKFLOW_CONCLUSION: ${{ github.event.workflow_run.conclusion }}
+        shell: python
+        run: |
+          import os
+          import json
+          import sys
+          import subprocess
+          from pathlib import Path
+
+          def find_results_file():
+              artifacts_path = Path('artifacts')
+
+              if not artifacts_path.exists():
+                  print('Artifacts directory not found')
+                  return None
+
+              files = list(artifacts_path.iterdir())
+              print(f'Available files: {[f.name for f in files]}')
+
+              for file in files:
+                  if file.name.endswith('auto-upmerge-results.json'):
+                      return file
+
+              return None
+
+          def load_results(results_file):
+              try:
+                  with open(results_file, 'r') as f:
+                      return json.load(f)
+              except Exception as e:
+                  print(f'Error loading results file: {e}')
+                  return None
+
+          def build_comment_body(results, workflow_conclusion):
+              pr_info = results.get('source_pr', {})
+              pr_number = pr_info.get('number', 'unknown')
+              source_branch = results.get('source_branch', 'unknown')
+
+              successful = results.get('successful_upmerges', [])
+              failed = results.get('failed_upmerges', [])
+              attempted = results.get('attempted_branches', [])
+
+              comment_body = "## 🔄 Auto Upmerge Results\n\n"
+
+              if workflow_conclusion == 'success' and successful and not failed:
+                  comment_body += "**Status**: ✅ All upmerges completed successfully\n"
+              elif successful and failed:
+                  comment_body += "**Status**: ⚠️ Partial success - some upmerges failed\n"
+              elif failed and not successful:
+                  comment_body += "**Status**: ❌ All upmerges failed\n"
+              else:
+                  comment_body += "**Status**: ❌ Auto upmerge workflow failed\n"
+
+              comment_body += f"**Source PR**: #{pr_number} - {pr_info.get('title', 'Unknown')}\n"
+              comment_body += f"**Source Branch**: `{source_branch}`\n"
+              comment_body += f"**Timestamp**: {results.get('timestamp', 'unknown')}\n\n"
+
+              if successful:
+                  comment_body += f"### ✅ Successful Upmerges ({len(successful)})\n\n"
+                  for branch in successful:
+                      branch_info = next((b for b in attempted if b['branch'] == branch), {})
+                      version = branch_info.get('version', 'unknown')
+                      comment_body += f"- `{branch}` (version: {version}) - PR created for manual review\n"
+                  comment_body += "\n"
+
+              if failed:
+                  comment_body += f"### ❌ Failed Upmerges ({len(failed)})\n\n"
+                  for branch in failed:
+                      branch_info = next((b for b in attempted if b['branch'] == branch), {})
+                      version = branch_info.get('version', 'unknown')
+                      comment_body += f"- `{branch}` (version: {version}) - Manual intervention required\n"
+                  comment_body += "\n**How To Resolve**: Check the auto upmerge workflow logs for specific error details. You may need to resolve conflicts manually.\n\n"
+
+              if not successful and not failed:
+                  comment_body += "No upmerge attempts were made. This could be due to:\n"
+                  comment_body += "- No branches were marked as successful in the upmerge test\n"
+                  comment_body += "- The auto upmerge workflow failed before attempting any upmerges\n\n"
+
+              comment_body += "*This comment was automatically generated by the auto upmerge workflow.*"
+
+              return comment_body
+
+          def post_github_comment(pr_number, comment_body):
+              if not pr_number or pr_number == 'unknown':
+                  print('No valid PR number found - cannot post comment')
+                  return False
+
+              comments_url = f'https://api.github.com/repos/{os.environ["GITHUB_REPOSITORY"]}/issues/{pr_number}/comments'
+              comment_data = json.dumps({"body": comment_body})
+
+              result = subprocess.run([
+                  'curl', '-X', 'POST', comments_url,
+                  '-H', 'Content-Type: application/json',
+                  '-H', f'Authorization: token {os.environ["GITHUB_TOKEN"]}',
+                  '--data', comment_data
+              ], capture_output=True, text=True)
+
+              if result.returncode == 0:
+                  print('Successfully posted upmerge results comment')
+                  return True
+              else:
+                  print(f'Failed to post comment: {result.stderr}')
+                  return False
+
+          def post_fallback_comment(workflow_conclusion):
+              fallback_comment = (
+                  "## 🔄 Auto Upmerge Results\n\n"
+                  "**Status**: ❌ Auto upmerge workflow failed\n"
+                  "**How To Resolve**: Check the auto upmerge workflow logs for error details. "
+                  "The workflow may have failed before generating detailed results.\n\n"
+                  f"**Workflow Status**: {workflow_conclusion}\n\n"
+                  "*This comment was automatically generated by the auto upmerge workflow.*"
+              )
+
+              # Try to get PR number from the original upmerge test artifacts or workflow
+              # This is a fallback, so we might not have all the context
+              print('Posting fallback comment - detailed results not available')
+              return fallback_comment
+
+          try:
+              workflow_conclusion = os.environ.get('WORKFLOW_CONCLUSION', 'unknown')
+
+              results_file = find_results_file()
+
+              if not results_file:
+                  print('No auto upmerge results found - posting fallback comment')
+                  fallback_comment = post_fallback_comment(workflow_conclusion)
+                  # We don't know the PR number in this case, so we can't post a comment
+                  print('Cannot determine PR number for fallback comment')
+                  sys.exit(0)
+
+              print(f'Found results file: {results_file.name}')
+
+              results = load_results(results_file)
+              if not results:
+                  print('Could not load results - cannot post comment')
+                  sys.exit(1)
+
+              print(f'Loaded results: {json.dumps(results, indent=2)}')
+
+              pr_number = results.get('source_pr', {}).get('number')
+              if not pr_number:
+                  print('No PR number in results - cannot post comment')
+                  sys.exit(1)
+
+              comment_body = build_comment_body(results, workflow_conclusion)
+              success = post_github_comment(pr_number, comment_body)
+
+              if not success:
+                  print('Failed to post comment')
+                  sys.exit(1)
+
+              print('Successfully processed auto upmerge results')
+
+          except Exception as e:
+              print(f'Error processing auto upmerge results: {e}')
+              sys.exit(1)