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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| name: Auto Merge Dependabot PR | ||
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| "on": | ||
| workflow_run: | ||
| workflows: ["CI"] | ||
| types: [completed] | ||
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| jobs: | ||
| auto-merge: | ||
| if: github.event.workflow_run.conclusion == 'success' && startsWith(github.event.workflow_run.head_branch, 'dependabot/') | ||
| runs-on: ubuntu-latest | ||
| permissions: | ||
| contents: write | ||
| pull-requests: write | ||
|
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||
| steps: | ||
| - name: Resolve Dependabot PR | ||
| id: pr | ||
| env: | ||
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | ||
| run: | | ||
| BRANCH_NAME="${{ github.event.workflow_run.head_branch }}" | ||
| PR_NUMBER=$(gh pr list --state open --head "${BRANCH_NAME}" --json number --jq '.[0].number // empty') | ||
| if [ -z "${PR_NUMBER}" ]; then | ||
| echo "No open Dependabot PR found for ${BRANCH_NAME}." >> "$GITHUB_STEP_SUMMARY" | ||
| exit 0 | ||
| fi | ||
| echo "pr_number=${PR_NUMBER}" >> "$GITHUB_OUTPUT" | ||
|
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| - name: Evaluate merge eligibility | ||
| id: merge_guard | ||
| if: steps.pr.outputs.pr_number != '' | ||
| env: | ||
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | ||
| run: | | ||
| gh pr view "${{ steps.pr.outputs.pr_number }}" --json number,isDraft,author,url,labels > pr.json | ||
| python3 - <<'PY' | ||
| import json | ||
| import os | ||
| from pathlib import Path | ||
|
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||
| 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", [])} | ||
| should_merge = author == "dependabot[bot]" and not pr.get("isDraft") | ||
| reason = "ready" if should_merge else "not_dependabot_or_draft" | ||
|
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| 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"- 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 | ||
|
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| - name: Append merge summary | ||
| if: steps.pr.outputs.pr_number != '' | ||
| run: cat pr-summary.md >> "$GITHUB_STEP_SUMMARY" | ||
|
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||
| - 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 }}" --rebase --delete-branch | ||
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In
.github/workflows/dependabot_auto_merge.yml, merge eligibility is based only on author/draft status and branch name, so a successfulworkflow_runfor an older commit on the same Dependabot branch can still merge the PR after newer commits are pushed. This can merge an unverified or failing head commit if CI for the latest SHA has not passed yet. Add a guard that comparesgithub.event.workflow_run.head_shawith the PR’s current head SHA (for example fromgh pr view --json headRefOid) before allowinggh pr merge.Useful? React with 👍 / 👎.