fix(graph): reconcile snapshot freshness when build sidecars are missing - #397
DivyamTalwar wants to merge 3 commits into
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Graph pulls treated a missing or corrupt last-build sidecar as an empty local state even when a valid same-HEAD snapshot was already present. An older cloud row could overwrite that local output after a crash or partial metadata write. Recover freshness from the validated snapshot observation, with file mtime as a fallback.\n\nConstraint: Sidecar writes are explicitly best-effort and can fail after the snapshot write succeeds.\nRejected: Make sidecar writes mandatory or roll back snapshots | would turn metadata failure into a graph build failure and complicate crash recovery.\nConfidence: high\nScope-risk: narrow\nReversibility: clean\nDirective: Keep snapshot validation and sidecar freshness semantics aligned when changing pull overwrite gates.\nTested: Deeplake pull regression; related pull/last-build/session/snapshot suites; TypeScript typecheck; package build.\nNot-tested: Full repository suite (coordinated centrally).
A commit-addressed snapshot is now validated against the current graph identity and its stable content hash before local freshness is used. Sidecar timestamps only participate after reconciling the sidecar with the payload, so stale metadata cannot make an older cloud row overwrite newer local graph state. Constraint: Local sidecars and snapshots are consistency metadata, not authenticated or tamper-proof storage Rejected: Trust observation project or generator version as repo identity | project varies across worktrees and generator version is observational Confidence: high Scope-risk: narrow Reversibility: clean Directive: Keep repo identity tied to deriveProjectKey(cwd) and preserve cross-worktree observation flexibility Tested: Node 22 pull regressions 79 tests, shared graph suite 651 tests, tsc --noEmit, esbuild bundle Not-tested: Live Deeplake endpoint, crash durability beyond atomic rename, cryptographic authenticity of local files
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ChangesSnapshot freshness reconciliation
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant pullSnapshot
participant LocalSnapshotFile
participant Sidecar
participant CloudSnapshotSource
pullSnapshot->>LocalSnapshotFile: Read current-commit snapshot
LocalSnapshotFile-->>pullSnapshot: Snapshot payload or invalid state
pullSnapshot->>Sidecar: Reconcile compatible sidecar metadata
Sidecar-->>pullSnapshot: Valid timestamp or rejected state
pullSnapshot->>CloudSnapshotSource: Resolve freshness
CloudSnapshotSource-->>pullSnapshot: Preserve local snapshot or return cloud payload
Merge Risk: ⚪ Minimal · up to The change addresses the reported stale-sidecar and incomplete-snapshot cases without an established merge-blocking regression. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@src/graph/deeplake-pull.ts`:
- Line 389: Update reconcileLocalSnapshotState to reject sidecar records whose
ts is later than the current time, alongside the existing null, commit_sha, and
snapshot_sha256 validation, so future sidecars cannot make local state appear
newer. Also change the related test fixture timestamp to a past value that
remains newer than the cloud timestamp.
- Line 410: Require snapshot.observation in the local snapshot validation before
accepting a same-HEAD snapshot. Update the observation validation around
snapshot.observation so undefined values fail, while preserving the existing
checks for ts, branch, worktree_path, repo_project, generator_version, and
extraction counters.
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src/graph/deeplake-pull.tstests/shared/graph/deeplake-pull.test.ts
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Addressed both snapshot-validation findings in 04f9de7. Future sidecar timestamps no longer supply freshness, and required observation metadata is checked before hash-equality can retain a local file. Both reported regressions fail on the previous head. The correction passes 655 local graph tests and the exact-head Linux full suite: 5,857 passed, zero failed or skipped, plus coverage/build/typecheck/duplication/bundle checks. Validation: https://github.com/DivyamTalwar/hivemind/actions/runs/35776125170 . The description now reflects this head. Leaving review resolution to your verification. |
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Summary
Fixes #396.
Prevent an older cloud graph from overwriting a newer compatible same-HEAD snapshot merely because its build sidecar was lost or became stale. Read the commit-addressed payload, validate its repository/head/schema/generator identity and required observation metadata, recompute its stable-field hash, and use sidecar freshness only when it matches the valid payload.
The review follow-up ignores a matching sidecar whose timestamp is in the future and requires observation metadata even when the stable-field hash matches. Missing, null or incomplete observations cannot preserve a malformed local file. A valid newer local snapshot still remains authoritative when its sidecar is missing, stale or invalid.
Version Bump
No release requested. Package versions, dependencies, lockfiles and release workflows are unchanged.
Test plan
4d160570: a future sidecar suppresses repair, and missing observation metadata returns an incorrect up-to-date result.04f9de7c3ad01acfc5e13ccef6f9526cc6cedcf1passes the independent Node 22/Linux full suite with coverage: 5,857 passed, zero failed, zero skipped. Typecheck, build, duplication guard, critical-only OpenClaw bundle audit and diff checks pass in the same run.Exact final-commit commands and retained logs, job
snapshot-validation-review. Earlier results are not reused as proof for this follow-up.Limits
Hashes and metadata establish local consistency, not authentication against a writer with access to the same files. The pre-existing equal-hash sidecar fast path when the snapshot file is absent is unchanged; this is not a full local-store repair redesign. Cloud payload compatibility and per-worktree state handling are unchanged. Atomic rename is not fsync durability. No live backend, customer data or credentials were used. A clean full macOS suite or Windows runtime result is not claimed. Maintainer review and upstream workflow approval remain separate from the independent gate.
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