Dependabot Auto-merge #575
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| # ------------------------------------------------------------------------------ | |
| # Dependabot Auto-merge Workflow | |
| # | |
| # Purpose: Automatically merge Dependabot **minor / patch** updates once all | |
| # required checks pass. Major updates only get an alert comment. | |
| # | |
| # Triggers: Pull‑request events, review submissions, and completed checks. | |
| # | |
| # Maintainer: @mrz1836 | |
| # | |
| # Rules for Auto‑Merge: | |
| # • PR must be opened by Dependabot and found by this workflow | |
| # • All required status checks must pass | |
| # • Only minor and patch updates are auto-merged | |
| # • Major updates will only receive an alert comment | |
| # • PR must have the 'automerge' label | |
| # ------------------------------------------------------------------------------ | |
| name: dependabot-auto-merge | |
| on: | |
| pull_request_target: | |
| types: [opened, synchronize, reopened, ready_for_review, unlocked, edited] | |
| pull_request_review: | |
| types: [submitted] | |
| check_suite: | |
| types: [completed] | |
| status: {} # completed status checks | |
| permissions: | |
| contents: read | |
| pull-requests: read | |
| concurrency: | |
| group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }} | |
| cancel-in-progress: true | |
| jobs: | |
| automerge: | |
| runs-on: ubuntu-latest | |
| permissions: | |
| pull-requests: write | |
| contents: write | |
| steps: | |
| # ----------------------------------------------------------------------- | |
| # 1. Locate the pull request for this event | |
| # ----------------------------------------------------------------------- | |
| - name: Locate pull request | |
| id: pr | |
| uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1 | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| script: | | |
| const { repo, owner } = context.repo; | |
| let pr = context.payload.pull_request; | |
| // If triggered by check_suite / status, look up the PR by SHA | |
| if (!pr) { | |
| const sha = | |
| context.payload.check_suite?.head_sha ?? | |
| context.payload.check_run?.head_sha ?? | |
| context.payload.sha ?? | |
| context.payload.after; | |
| if (sha) { | |
| const { data: prs } = | |
| await github.rest.repos.listPullRequestsAssociatedWithCommit({ | |
| owner, | |
| repo, | |
| commit_sha: sha, | |
| }); | |
| pr = prs.find(p => p.state === 'open'); | |
| } | |
| } | |
| if (!pr) { | |
| core.info('No open PR found – skipping.'); | |
| core.setOutput('found', 'false'); | |
| return; | |
| } | |
| core.setOutput('found', 'true'); | |
| core.setOutput('number', pr.number); | |
| core.setOutput('actor', pr.user.login); | |
| core.setOutput('title', pr.title.replace(/\n/g, ' ')); | |
| # ----------------------------------------------------------------------- | |
| # 1a. Exit when no PR was found | |
| # ----------------------------------------------------------------------- | |
| - name: Exit when no PR found | |
| if: steps.pr.outputs.found != 'true' | |
| run: echo "PR not found – exiting." | |
| # ----------------------------------------------------------------------- | |
| # 2. Make sure the PR was opened by Dependabot | |
| # ----------------------------------------------------------------------- | |
| - name: Validate Dependabot author | |
| id: author | |
| if: steps.pr.outputs.found == 'true' | |
| uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1 | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| script: | | |
| const actor = '${{ steps.pr.outputs.actor }}'; | |
| const allowed = ['dependabot[bot]', 'dependabot-preview[bot]'].includes(actor); | |
| core.setOutput('allowed', allowed); | |
| if (!allowed) core.info(`PR opened by ${actor} – skipping automerge.`); | |
| # ----------------------------------------------------------------------- | |
| # 2a. Exit when PR was not opened by Dependabot | |
| # ----------------------------------------------------------------------- | |
| - name: Exit for non-Dependabot PR | |
| if: steps.author.outputs.allowed != 'true' | |
| run: echo "Not a Dependabot PR – exiting." | |
| # --------------------------------------------------------------------- | |
| # 3. Detect minor / major / unknown bump | |
| # --------------------------------------------------------------------- | |
| - name: Check version bump | |
| id: bump | |
| if: steps.author.outputs.allowed == 'true' | |
| uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1 | |
| with: | |
| script: | | |
| const title = '${{ steps.pr.outputs.title }}'; | |
| // Matches “from 1.2.3 to 1.3.0”, “from v4 to v4.0.1”, etc. | |
| const match = title.match(/from\s+v?(\d+)(?:\.\d+)*\s+to\s+v?(\d+)/i); | |
| let isMinor = false; | |
| let isUnknown = false; | |
| if (!match) { | |
| isUnknown = true; // SHA bumps or unparsable versions | |
| } else { | |
| isMinor = match[1] === match[2]; | |
| } | |
| core.setOutput('is_minor', isMinor); | |
| core.setOutput('is_major', !isMinor && !isUnknown); | |
| core.setOutput('is_unknown', isUnknown); | |
| # --------------------------------------------------------------------- | |
| # 4a. Alert on major bump | |
| # --------------------------------------------------------------------- | |
| - name: Alert on major version bump | |
| if: steps.bump.outputs.is_major == 'true' | |
| uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1 | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| script: | | |
| await github.rest.issues.createComment({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: Number('${{ steps.pr.outputs.number }}'), | |
| body: '⚠️ @mrz1836 – this is a **major** version bump and needs manual review.' | |
| }); | |
| # --------------------------------------------------------------------- | |
| # 4b. Alert when a version couldn’t be parsed (commit SHA → SHA) | |
| # --------------------------------------------------------------------- | |
| - name: Alert on undetected version bump | |
| if: steps.bump.outputs.is_unknown == 'true' | |
| uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1 | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| script: | | |
| await github.rest.issues.createComment({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: Number('${{ steps.pr.outputs.number }}'), | |
| body: '⚠️ @mrz1836 – Dependabot could not determine version semantics (SHA → SHA). Please review manually.' | |
| }); | |
| # ----------------------------------------------------------------------- | |
| # 5. Auto-approve minor / patch bumps | |
| # ----------------------------------------------------------------------- | |
| - name: Auto-approve minor update | |
| if: steps.bump.outputs.is_minor == 'true' | |
| uses: hmarr/auto-approve-action@f0939ea97e9205ef24d872e76833fa908a770363 # v4.0.0 | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| pull-request-number: ${{ steps.pr.outputs.number }} # ← NEW | |
| review-message: Automatically approving Dependabot minor/patch update | |
| # ----------------------------------------------------------------------- | |
| # 6. Add the required `automerge` label (used by pascalgn/automerge) | |
| # ----------------------------------------------------------------------- | |
| - name: Add automerge label | |
| if: steps.bump.outputs.is_minor == 'true' | |
| uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1 | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| script: | | |
| await github.rest.issues.addLabels({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: Number('${{ steps.pr.outputs.number }}'), | |
| labels: ['automerge'] | |
| }); | |
| # ----------------------------------------------------------------------- | |
| # 7. Auto-merge when checks are green | |
| # ----------------------------------------------------------------------- | |
| - name: Auto-merge minor update | |
| if: steps.bump.outputs.is_minor == 'true' | |
| uses: pascalgn/automerge-action@7961b8b5eec56cc088c140b56d864285eabd3f67 # v0.16.4 | |
| env: | |
| GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} | |
| MERGE_LABELS: "automerge" # must match label we just added | |
| MERGE_METHOD: merge | |
| MERGE_COMMIT_MESSAGE: pull-request-title | |
| MERGE_RETRIES: "30" # up to ~30 minutes | |
| MERGE_RETRY_SLEEP: "60000" |