ci(deps): allow trusted-namespace majors in auto-merge#17
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Adds a policy step that admits major-version Dependabot PRs only when every listed dependency belongs to dependabot/, actions/, or smartwatermelon/ namespaces. Patch/minor remain always-allowed. The major decision is computed from previous-version vs new-version rather than trusting steps.metadata.outputs.update-type. On 2026-04-28, fetch-metadata@v2 mislabeled a 2.0.1 -> 3.0.0 reusable-workflow bump as semver-patch (verified in run logs), allowing the existing patch-only gate to admit a major. The new step compares the leading integer of each version string and treats any difference as major. Fails closed when dependency-names is empty on a major bump (adversarial-review catch — without the dep list, the namespace allowlist cannot be applied, so we cannot grant auto-merge). Includes the docs/plans/ rollout plan and unit-tested policy logic. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This was referenced Apr 28, 2026
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Summary
dependabot-auto-merge.ymlthat admits major-version Dependabot PRs only when every dep independency-namesis independabot/,actions/, orsmartwatermelon/.previous-version/new-versiondirectly, notupdate-type. On 2026-04-28fetch-metadata@v2mislabeled a2.0.1 → 3.0.0reusable-workflow bump assemver-patch, so we trust the version math instead of the label.dependency-namesfor a major bump (adversarial-review catch).Plan
docs/plans/2026-04-28-dependabot-auto-merge-c2.md
Test plan
smartwatermelon/dev-env#16(dependabot/fetch-metadata 2 → 3); confirm it auto-merges. This validates the trusted-major path end-to-end before Phase 4 propagation to the other 15 repos.🤖 Generated with Claude Code