Auto Merge Dependabot PR #301
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| name: Auto Merge Dependabot PR | |
| "on": | |
| workflow_run: | |
| workflows: ["CI"] | |
| types: [completed] | |
| jobs: | |
| auto-merge: | |
| if: github.event.workflow_run.conclusion == 'success' && startsWith(github.event.workflow_run.head_branch, 'dependabot/') | |
| runs-on: ubuntu-latest | |
| timeout-minutes: 10 | |
| permissions: | |
| contents: write | |
| pull-requests: write | |
| steps: | |
| - name: Resolve Dependabot PR | |
| id: pr | |
| env: | |
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | |
| run: | | |
| set -euo pipefail | |
| BRANCH_NAME="${{ github.event.workflow_run.head_branch }}" | |
| PR_PAYLOAD=$(gh pr list --repo "${GITHUB_REPOSITORY}" --state open --head "${BRANCH_NAME}" --json number,headRefOid --jq '.[0] // {}') | |
| PR_NUMBER=$(python3 -c 'import json,sys; print(json.load(sys.stdin).get("number", ""))' <<<"${PR_PAYLOAD}") | |
| PR_HEAD_SHA=$(python3 -c 'import json,sys; print(json.load(sys.stdin).get("headRefOid", ""))' <<<"${PR_PAYLOAD}") | |
| if [ -z "${PR_NUMBER}" ]; then | |
| echo "No open Dependabot PR found for ${BRANCH_NAME}." >> "$GITHUB_STEP_SUMMARY" | |
| exit 0 | |
| fi | |
| if [ "${PR_HEAD_SHA}" != "${{ github.event.workflow_run.head_sha }}" ]; then | |
| echo "Skipping auto-merge: PR #${PR_NUMBER} head ${PR_HEAD_SHA} does not match completed CI head ${{ github.event.workflow_run.head_sha }}." >> "$GITHUB_STEP_SUMMARY" | |
| exit 0 | |
| fi | |
| echo "pr_number=${PR_NUMBER}" >> "$GITHUB_OUTPUT" | |
| echo "head_sha=${PR_HEAD_SHA}" >> "$GITHUB_OUTPUT" | |
| - name: Evaluate merge eligibility | |
| id: merge_guard | |
| if: steps.pr.outputs.pr_number != '' | |
| env: | |
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | |
| run: | | |
| set -euo pipefail | |
| gh pr view "${{ steps.pr.outputs.pr_number }}" --repo "${GITHUB_REPOSITORY}" --json number,isDraft,author,url,title,body,labels > pr.json | |
| python3 - <<'PY' | |
| import json | |
| import os | |
| from pathlib import Path | |
| pr = json.loads(Path("pr.json").read_text(encoding="utf-8")) | |
| author = (pr.get("author") or {}).get("login") | |
| labels = {item.get("name", "") for item in pr.get("labels", [])} | |
| title = pr.get("title") or "" | |
| body = pr.get("body") or "" | |
| is_major = "update-type: version-update:semver-major" in body | |
| sensitive_labels = {"docker", "github_actions"} | |
| is_sensitive = bool(labels & sensitive_labels) or "QuantStrategyLab/" in title or "QuantStrategyLab/" in body | |
| dependabot_authors = {"dependabot[bot]", "app/dependabot"} | |
| is_dependabot = author in dependabot_authors and "dependencies" in labels | |
| should_merge = is_dependabot and not pr.get("isDraft") and not is_major and not is_sensitive | |
| if should_merge: | |
| reason = "ready" | |
| elif is_major: | |
| reason = "major_update" | |
| elif is_sensitive: | |
| reason = "sensitive_dependency_update" | |
| else: | |
| reason = "not_eligible_dependabot_pr" | |
| summary_lines = [ | |
| "## Auto-Merge Gate", | |
| f"- PR: {pr['url']}", | |
| f"- Author: `{author or '<unknown>'}`", | |
| f"- Draft: `{'yes' if pr.get('isDraft') else 'no'}`", | |
| f"- Dependabot label: `{'yes' if 'dependencies' in labels else 'no'}`", | |
| f"- Major update: `{'yes' if is_major else 'no'}`", | |
| f"- Sensitive dependency class: `{'yes' if is_sensitive else 'no'}`", | |
| f"- Final merge decision: `{'merge' if should_merge else 'skip'}`", | |
| f"- Reason: `{reason}`", | |
| ] | |
| Path("pr-summary.md").write_text("\n".join(summary_lines).strip() + "\n", encoding="utf-8") | |
| with open(os.environ["GITHUB_OUTPUT"], "a", encoding="utf-8") as output: | |
| print(f"should_merge={'true' if should_merge else 'false'}", file=output) | |
| print(f"reason={reason}", file=output) | |
| PY | |
| - name: Append merge summary | |
| if: steps.pr.outputs.pr_number != '' | |
| run: cat pr-summary.md >> "$GITHUB_STEP_SUMMARY" | |
| - name: Merge Dependabot PR | |
| if: steps.merge_guard.outputs.should_merge == 'true' | |
| env: | |
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | |
| run: gh pr merge "${{ steps.pr.outputs.pr_number }}" --repo "${GITHUB_REPOSITORY}" --auto --rebase --delete-branch --match-head-commit "${{ steps.pr.outputs.head_sha }}" |