fix(sync): bind canary handoff to exact plan - #3118
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Included review availability: 1 review is currently available. Based on recent review activity, included reviews refill at 2 per hour. 📝 WalkthroughWalkthroughThe change adds versioned no-change canary evidence, records exact consumer commits, propagates sync-plan metadata through Maint 68 and Maint 71, and restricts candidate selection and recovery to matching plans, source commits, branch heads, and required checks. ChangesSync evidence validation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The change tightens canary handoffs, but the current head can still treat a no-change recovery as passing when no required checks are declared, allowing promotion without the documented validation gate; it also downloads artifacts through a mutable action reference. These bounded correctness and reproducibility risks should be fixed or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant Maint68
participant SyncEvidence
participant Maint71Workflow
participant Maint71Script
participant GitHubChecks
Maint68->>SyncEvidence: Build plan-bound no-change evidence
SyncEvidence->>Maint71Workflow: Provide baseline evidence and source metadata
Maint71Workflow->>Maint71Script: Start candidate validation or recovery
Maint71Script->>GitHubChecks: Retrieve required checks for the target ref
GitHubChecks-->>Maint71Script: Return check classification
Maint71Script-->>Maint71Workflow: Accept matching evidence or fail closed
Possibly related PRs
Suggested labels: Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Automated Status SummaryHead SHA: 3e4d09e
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Updated automatically; will refresh on subsequent CI/Docker completions. Keepalive checklistScopeNo scope information available Tasks
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Inline comments:
In @.github/scripts/__tests__/sync-run-contract.test.js:
- Around line 51-72: Add tests for buildNoChangeCanaryEvidence covering
duplicate_no_change_canary with two no_changes results for the same repository,
plus separate scope-mismatch cases where plan_scope and scope_base_sha differ
from the expected values. Assert each result is rejected and includes the
corresponding validation error.
In @.github/scripts/maint71_merge_sync_prs.js:
- Around line 1202-1224: Update the no-change recovery gate around
classifyRequiredChecksForRef to reject an empty requiredContexts set even when
classification.status is ready. In selectLatestMergedCandidatePr recovery,
require both expectedPlanId and expectedSourceCommit before accepting a
candidate. In docs/ops/CONSUMER_REPO_MAINTENANCE.md lines 356-369, no direct
change is needed if both gates now fail closed; otherwise document the
unconstrained cases explicitly.
In @.github/workflows/maint-68-sync-consumer-repos.yml:
- Around line 1658-1663: Pin the actions/download-artifact reference in the
“Download per-repository sync results” step to a full commit SHA instead of the
mutable v8 tag, and retain the corresponding version in a trailing comment.
- Around line 476-480: Update the “Record exact consumer base” step identified
by id consumer_base so failure of git -C consumer rev-parse HEAD causes the step
to fail rather than emitting an empty sha. Enable fail-fast shell behavior or
otherwise explicitly validate the command result before writing to
GITHUB_OUTPUT, while preserving the successful sha output.
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📒 Files selected for processing (9)
.github/scripts/__tests__/sync-run-contract.test.js.github/scripts/__tests__/sync_pr_merge_contract.test.js.github/scripts/maint71_merge_sync_prs.js.github/scripts/sync_pr_merge_contract.js.github/scripts/sync_run_contract.js.github/workflows/maint-68-sync-consumer-repos.yml.github/workflows/maint-71-merge-sync-prs.ymldocs/ops/CONSUMER_REPO_MAINTENANCE.mdtests/workflows/test_sync_manifest_delivery.py
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GitHub allows at most 10 workflow_dispatch inputs; consolidate the four immutable handoff fields into immutable_handoff_json and resolve them in a dedicated step so Maint 68 dispatch and workflow_call callers keep working. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
Stall diagnosis
Trend_Model_Project#5895 remained on head 565629783eb435ecb1fdce18f6756c4ee8402282 after a successful full canary reported no changes. Maint 71 then recovered an older merged candidate and Maint 68 promoted that stale plan, leaving the missing lease-contract dependency and active review finding unchanged.
Recurrence contract
Detection fails closed when no open candidate, current exact-head no-change evidence, or same-plan merged candidate exists. Remediation is a fresh immutable Maint 68 run. The rule is enforced in the sync run, Maint 71 executor, merge contract, workflow inputs, tests, and operator guide.
Validation
Summary by CodeRabbit
New Features
Bug Fixes
Documentation
Tests