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Add Dependabot auto-merge #61
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| name: Auto Merge Dependabot PR | ||
|
|
||
| "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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The workflow calls
gh pr list/view/mergewithout--repoand without checking out the repository, so these commands run outside a git repo context and can fail to resolve which repo to query. GitHub’s CLI docs stategh pr list --repo OWNER/REPOis required unless you run the command from a local git repository. In this workflow there is noactions/checkoutstep, so auto-merge can silently stop working before it ever reaches merge logic.Useful? React with 👍 / 👎.