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deepseek-harness/docs/rfc/007-supply-chain-and-vendor-drift.md
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RFC 007: Supply chain checks and vendor drift verification

Status: proposed

Problem

The vendor manifest (ADR 0001) is enforced at commit time in the forward direction (vendored change ⇒ manifest update) but nothing verifies the manifest's claims: that vendor/ actually equals upstream-at-SHA plus exactly the logged modifications. And the handful of true npm dependencies have no advisory monitoring or update cadence.

Proposal

  1. Vendor drift check (nightly CI): clone the upstream repos at the manifest SHAs (shallow), copy the corresponding package sources, and diff against vendor/*/src. The job fails unless the diff matches the logged local modifications (kept as a checked-in patch file per modification — the log entries become verifiable artifacts rather than prose).
  2. Dependency advisories: osv-scanner (or yarn npm audit) job on the lockfile, scheduled + on lockfile-touching PRs.
  3. License inventory: a script asserting every vendored package carries its LICENSE and that package.json license fields match the inventory in vendor/README.md (we mix vendored MIT with our BSD-3) — CI step.
  4. Renovate (or a scheduled agent task) proposing npm dependency updates in small PRs that ride the full gate suite; vendored packages are excluded (their updates follow the manifest sync procedure, ideally as a semi-automated agent workflow: fetch upstream, re-apply patches, run gates, open PR with the manifest table updated).

Plan

3 is trivial — do first. 1 requires network access from CI to the upstream repos (private — needs a token) and converting the two existing logged modifications into patch files. 2 and 4 are config.

Risks

Upstream repos are private mirrors; CI credentials and availability are the main friction for the drift check. If blocked, run it as a local scheduled agent task instead of CI.