Auto Merge Dependabot PR #30
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| 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 "${GITHUB_REPOSITORY}" --json number,isDraft,author,url,body,labels > pr.json | |
| python3 - <<'PY' | |
| import json | |
| import os | |
| from pathlib import Path | |
| pr = json.loads(Path("pr.json").read_text(encoding="utf-8")) | |
| author = (pr.get("author") or {}).get("login") | |
| labels = {item.get("name", "") for item in pr.get("labels", [])} | |
| body = pr.get("body") or "" | |
| is_major = "update-type: version-update:semver-major" in body | |
| dependabot_authors = {"dependabot[bot]", "app/dependabot"} | |
| is_dependabot = author in dependabot_authors and "dependencies" in labels | |
| should_merge = is_dependabot and not pr.get("isDraft") and not is_major | |
| if should_merge: | |
| reason = "ready" | |
| elif is_major: | |
| reason = "major_update" | |
| else: | |
| reason = "not_eligible_dependabot_pr" | |
| summary_lines = [ | |
| "## Auto-Merge Gate", | |
| f"- PR: {pr['url']}", | |
| f"- Author: `{author or '<unknown>'}`", | |
| f"- Draft: `{'yes' if pr.get('isDraft') else 'no'}`", | |
| f"- Dependabot label: `{'yes' if 'dependencies' in labels else 'no'}`", | |
| f"- Major update: `{'yes' if is_major else 'no'}`", | |
| f"- Final merge decision: `{'merge' if should_merge else 'skip'}`", | |
| f"- Reason: `{reason}`", | |
| ] | |
| Path("pr-summary.md").write_text("\n".join(summary_lines).strip() + "\n", encoding="utf-8") | |
| with open(os.environ["GITHUB_OUTPUT"], "a", encoding="utf-8") as output: | |
| print(f"should_merge={'true' if should_merge else 'false'}", file=output) | |
| print(f"reason={reason}", file=output) | |
| PY | |
| - name: Append merge summary | |
| if: steps.pr.outputs.pr_number != '' | |
| run: cat pr-summary.md >> "$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 "${GITHUB_REPOSITORY}" --rebase --delete-branch --match-head-commit "${{ steps.pr.outputs.head_sha }}" |