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ci: auto-merge Dependabot updates and update every dependency #124
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2dcaa6f
ci: merge Dependabot minor and patch updates automatically
polaz a54a84f
ci: auto-merge every Dependabot update but GitHub Actions majors
polaz 1f164ef
ci: keep Docker updates manual and record why the token suffices
polaz e4156bd
build(deps): update every dependency to its latest release
polaz 114fe68
fix(deps): require the grpcio the shipped stubs were generated by
polaz 0f22655
ci: re-arm a reopened Dependabot pull request
polaz 1e22e32
ci: record why the auto-merge workflow needs no more
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,173 @@ | ||
| name: Dependabot Auto-Merge | ||
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| # `pull_request_target`, not `pull_request`, because of how Dependabot runs are | ||
| # isolated: a workflow triggered by Dependabot on `pull_request` receives | ||
| # Dependabot secrets rather than Actions secrets, so the organisation's | ||
| # RELEASER_APP_* secrets resolve to empty strings and the App token step fails | ||
| # before it does anything. `pull_request_target` runs in the base branch's | ||
| # context, where those secrets are available, which is also GitHub's own | ||
| # recommendation for this pattern. This is observed, not assumed: the same | ||
| # workflow in the organisation's other repositories, on runs Dependabot | ||
| # triggered, logs "Secret source: Actions" and mints the App token. For | ||
| # example coordinode-lsm-tree run 38696382130 (event `pull_request_target`, | ||
| # actor and triggering actor `dependabot[bot]`) generated the App token and | ||
| # armed auto-merge. The restriction GitHub documents for Dependabot-triggered | ||
| # `pull_request_target` applies when the base ref was created by Dependabot; | ||
| # here the base is the default branch. | ||
| # | ||
| # That context carries write-capable credentials, so this workflow must never | ||
| # execute code from the pull request. It does not: there is no checkout, and | ||
| # every step either reads PR metadata through the API or drives `gh`. Do not add | ||
| # a checkout here; if one ever becomes necessary, it must not use the head ref. | ||
| # | ||
| # Enabling auto-merge only arms it: the merge happens when every check the | ||
| # default-branch ruleset requires has passed, as for any other pull request. | ||
| on: | ||
| pull_request_target: | ||
| types: [opened, synchronize, reopened] | ||
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| permissions: | ||
| # Only what the default token needs: `dependabot/fetch-metadata` reads the | ||
| # pull request. Approving, disarming and merging are done with the App token | ||
| # below, so nothing here needs write access to the repository contents. | ||
| pull-requests: read | ||
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| # One run per pull request, and a new push cancels the run it superseded rather | ||
| # than leaving it racing toward a head that no longer exists. | ||
| concurrency: | ||
| group: dependabot-auto-merge-${{ github.event.pull_request.number }} | ||
| cancel-in-progress: true | ||
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| jobs: | ||
| auto-merge: | ||
| runs-on: ubuntu-latest | ||
| # Only the author here. Who triggered the run decides what the job does, not | ||
| # whether it runs at all: a push by anyone else is the case that has to be | ||
| # handled, and a job that skips it cannot handle anything. | ||
| if: github.event.pull_request.user.login == 'dependabot[bot]' | ||
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| steps: | ||
| # Pinned to commit SHAs, not tags, because `pull_request_target` puts the | ||
| # App's private key within reach of whatever these resolve to: retargeting | ||
| # a mutable tag would be enough to take it. Dependabot updates a pinned | ||
| # SHA the same way it updates a tag, so this costs nothing to maintain. | ||
| - name: Generate App Token | ||
| id: app-token | ||
| uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0 | ||
| with: | ||
| app-id: ${{ secrets.RELEASER_APP_ID }} | ||
| private-key: ${{ secrets.RELEASER_APP_PRIVATE_KEY }} | ||
| # Least privilege: `pull-requests` to approve, to read whether | ||
| # auto-merge is armed and to disarm it; `contents` because the | ||
| # squash-merge writes to the default branch. No `actions` grant: the | ||
| # merge is made by the App installation, which holds the workflows | ||
| # permission, and the organisation's other repositories auto-merge | ||
| # Dependabot updates to workflow files with exactly these two: in | ||
| # coordinode-lsm-tree, #909 (changes .github/workflows/benchmark.yml) | ||
| # and #693 were merged by the App through auto-merge armed this way. | ||
| permission-contents: write | ||
| permission-pull-requests: write | ||
|
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| # Auto-merge, once enabled, outlives the head it was enabled for. GitHub | ||
| # turns it off by itself only when the pusher lacks write access, so a | ||
| # maintainer adding commits to an open Dependabot pull request leaves it | ||
| # armed, and it then merges those commits. `--match-head-commit` does not | ||
| # cover this: it is a precondition checked when the command runs, not a | ||
| # standing binding to that SHA. | ||
| # | ||
| # So the run a foreign push triggers disarms rather than skips. The | ||
| # approval is left to the repository's stale-review dismissal, which is | ||
| # the setting that exists for it. The push itself cannot merge in the | ||
| # meantime: the ruleset requires up-to-date, passing checks, which rerun | ||
| # on the new head and take minutes, while this job disarms in seconds. | ||
| # | ||
| # `github.actor` is who caused the event, and a rerun keeps it: rerunning | ||
| # a Dependabot run leaves `actor` as dependabot with `triggering_actor` | ||
| # set to whoever asked, and rerunning a foreign-push run keeps the pusher | ||
| # in `actor`. So the actor of a `synchronize` event says whether the head | ||
| # moved under someone else, on the first attempt and on every rerun | ||
| # alike. A reopen moves no head, so it never disarms; see below. | ||
| - name: Disarm auto-merge when someone else moved the head | ||
| if: github.event.action == 'synchronize' && github.actor != 'dependabot[bot]' | ||
| # The head is checked because disarming has no precondition of its own: | ||
| # `--match-head-commit` maps to `expectedHeadOid`, which the mutation | ||
| # behind `--disable-auto` does not take. Without the check, a slow run | ||
| # from one push can disable the auto-merge a later Dependabot run | ||
| # legitimately armed. | ||
| # | ||
| # Every value the script reads arrives through the environment. An | ||
| # expression interpolated into `run:` is expanded before the shell sees | ||
| # the line, so its contents become script rather than data. | ||
| run: | | ||
| state=$(gh pr view "$PR_NUMBER" --json autoMergeRequest,headRefOid \ | ||
| --jq '"\(.autoMergeRequest != null) \(.headRefOid)"') | ||
| armed=${state%% *} | ||
| current=${state##* } | ||
| if [ "$current" != "$HEAD_SHA" ]; then | ||
| echo "head is now $current, not the $HEAD_SHA this run saw;" | ||
| echo "a later run owns this pull request, leaving its state alone" | ||
| elif [ "$armed" = "true" ]; then | ||
| gh pr merge --disable-auto "$PR_NUMBER" | ||
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| echo "auto-merge disarmed: the head moved under a push by $PUSHER" | ||
| else | ||
| echo "auto-merge was not armed; nothing to disarm" | ||
| fi | ||
| env: | ||
| GH_TOKEN: ${{ steps.app-token.outputs.token }} | ||
| GH_REPO: ${{ github.repository }} | ||
| PR_NUMBER: ${{ github.event.pull_request.number }} | ||
| PUSHER: ${{ github.triggering_actor }} | ||
| HEAD_SHA: ${{ github.event.pull_request.head.sha }} | ||
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| # No token passed: the action's `github-token` already defaults to | ||
| # `github.token`, which the permissions block above scopes to reading the | ||
| # pull request. Keyed on the event actor, not on who pressed rerun: a | ||
| # maintainer rerunning a failed Dependabot run must be able to restore the | ||
| # approval and auto-merge, and both are bound to the head SHA below, so | ||
| # the rerun cannot approve anything Dependabot did not push. | ||
| # | ||
| # A reopen by a maintainer runs this too: closing the pull request | ||
| # disarmed its auto-merge, and nothing else would arm it again until | ||
| # Dependabot's next push. That is safe because this action verifies that | ||
| # every commit on the pull request is Dependabot's and fails otherwise, | ||
| # so a branch someone else pushed to is never approved on reopen. | ||
| - name: Dependabot metadata | ||
| id: metadata | ||
| if: github.actor == 'dependabot[bot]' || github.event.action == 'reopened' | ||
| uses: dependabot/fetch-metadata@25dd0e34f4fe68f24cc83900b1fe3fe149efef98 # v3.1.0 | ||
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| # The metadata step is skipped for a foreign push, so its outputs are | ||
| # empty there and this condition is false: approval happens only on a run | ||
| # Dependabot itself triggered, or on a reopen of a branch holding only | ||
| # Dependabot's commits. | ||
| # | ||
| # Every update merges once CI is green, majors included, where CI runs | ||
| # what changed: Python and Rust updates are what the test, integration, | ||
| # embedded and demo jobs run on. Two stay manual. A major GitHub Actions | ||
| # update: several actions run only in release.yml, on a tag, so a green | ||
| # pull request proves nothing about them. Any Docker update: no job | ||
| # builds the demo image (the demo job installs the lock without Docker), | ||
| # so a base-image change is untested until someone builds it. | ||
| # | ||
| # `package-ecosystem` is `github_actions`, with an underscore: the action | ||
| # takes it from the second segment of the Dependabot branch name | ||
| # (`dependabot/github_actions/...`), not from the `github-actions` key | ||
| # of dependabot.yml. | ||
| - name: Approve and enable auto-merge | ||
| if: >- | ||
| steps.metadata.outcome == 'success' | ||
| && steps.metadata.outputs.package-ecosystem != 'docker' | ||
| && !(steps.metadata.outputs.package-ecosystem == 'github_actions' | ||
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| && steps.metadata.outputs.update-type == 'version-update:semver-major') | ||
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| # Both operations name the head this run actually inspected, rather than | ||
| # just the pull request: the approval is recorded against a commit id, | ||
| # and the merge refuses outright if the head has moved. | ||
| run: | | ||
| gh api "repos/${GH_REPO}/pulls/${PR_NUMBER}/reviews" \ | ||
| -f event=APPROVE -f commit_id="$HEAD_SHA" --silent | ||
| gh pr merge --auto --squash --match-head-commit "$HEAD_SHA" "$PR_NUMBER" | ||
| env: | ||
| GH_TOKEN: ${{ steps.app-token.outputs.token }} | ||
| PR_NUMBER: ${{ github.event.pull_request.number }} | ||
| GH_REPO: ${{ github.repository }} | ||
| HEAD_SHA: ${{ github.event.pull_request.head.sha }} | ||
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