docs(core): admit S5-B2 race-free AuthoritySnapshot acquisition - #580
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Reviewer's GuideThis documentation-only PR admits S5-B2 by defining a single-process, reference-counted Sequence diagram for race-free AuthoritySnapshot guard acquisitionsequenceDiagram
participant Reader
participant Cell as CurrentRootHandle
participant Committer as RootCommit
participant Guard as AuthoritySnapshotGuard
par Reader acquisition
Reader->>Cell: acquire_authority_snapshot_guard()
Cell-->>Guard: clone current generation handle
Guard-->>Reader: AuthoritySnapshotGuard
and Concurrent commit
Committer->>Cell: commit_new_root(next)
Cell-->>Committer: replace current handle
end
Reader->>Guard: release(guard)
Guard-->>Cell: decrement reference count
Flow diagram for AuthoritySnapshot generation reclamationflowchart TD
A[Generation becomes unreachable from current previous and prepared roots] --> B{Guard reference count is zero?}
B -- No --> C[Retain generation as ACTIVE_READER_PIN]
B -- Yes --> D{Other recovery-retention reason applies?}
D -- Yes --> C
D -- No --> E[Generation eligible for reclamation]
E --> F[Cleanup may be batched or deferred]
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This PR correctly admits the S5-B2 child contract for race-free AuthoritySnapshot acquisition, resolving one of three blocking requirements for the R-15 secure storage implementation. The changes are internally consistent across all three modified files and properly maintain the contract's fail-closed posture by leaving S5-B1 and S5-B3 as explicit blockers.
The new AUTHORITY-SNAPSHOT-LIFETIME.md document provides a complete specification for atomic snapshot acquisition using reference-counted guards, closing the acquisition-window race condition identified in the parent contract's §5.3.3. The approach is appropriately scoped, avoiding unnecessary complexity (no hazard pointers or RCU required), and includes clear requirements for headless testing before production admission.
All status updates across files correctly reflect that S5-B2 is now admitted while S5-B1 (canonical migration source evidence) and S5-B3 (chunked large-object envelope) remain as blocking gates.
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📝 WalkthroughWalkthroughThe changes document the S5-B2 ChangesR-15 authority snapshot
Estimated code review effort: 1 (Trivial) | ~5 minutes Merge Risk: 🟡 Moderate · up to This documentation change admits a race-free snapshot-lifetime contract, but unresolved contradictions and omissions around publication ordering, generation retention, reclamation rules, and the parent reader algorithm could lead to unsafe reads or premature cleanup when implemented. The PR should not merge until those contract details are made consistent. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Hey - I've found 3 issues
Prompt for AI Agents
Please address the comments from this code review:
## Individual Comments
### Comment 1
<location path="docs/native/R15-SECURE-STORAGE-CONTRACT.md" line_range="7" />
<code_context>
+`PRODUCTION_AUTHORITY_SWITCH_ALLOWED = NO`. `S5_B2_ADMITTED = YES` (`docs/native/r15/AUTHORITY-SNAPSHOT-LIFETIME.md` — race-free `AuthoritySnapshot` acquisition/lifetime/reclamation, §5.3.3). Two blocking S5 child contracts remain, each an explicit fail-closed gate rather than an implicit gap: **S5-B1** (Canonical Migration Source & Payload Evidence — plaintext packaged-IDB source evidence, per-class canonical destination-payload bytes, `source_value_digest` value-equivalence, surviving atomic-write-temporary reconciliation, and identity-upgrade/recovery for unbound AAD-less legacy sources and unidentified legacy quarantine data, §10.1.2, §10.1.3, §10.4.1); **S5-B3** (Chunked Large-Object Envelope for records above the `64 MiB` whole-record limit, §13). S5 is terminal only once S5-A, S5-B1, S5-B2, and S5-B3 are all merged and post-merge green; S5-B1's and S5-B3's mechanisms are not designed in this baseline.
</code_context>
<issue_to_address>
**issue (bug_risk):** The parent contract now declares `S5_B2_ADMITTED = YES`, but its scope text still says that S5-B2 is not admitted and its reader algorithm still labels snapshot capture plus retention registration as unspecified and non-atomic. The same contract therefore gives implementers contradictory instructions about whether `AuthoritySnapshotGuard` is part of the admitted reader contract.
**Triggers:** When the parent contract is used as the implementation source of truth rather than the new child document.
**Suggested fix:** Update the remaining S5-A scope and reader-algorithm wording to state that step 2 is `guard := acquire_authority_snapshot_guard()` and is governed by the S5-B2 document.
</issue_to_address>
### Comment 2
<location path="docs/native/CORE-MIGRATION-LEDGER.md" line_range="20" />
<code_context>
+| 10 | R-15 protected desktop storage contract | **Design only (S5-A baseline)**, `docs/native/R15-SECURE-STORAGE-CONTRACT.md`; current desktop records remain TS/Tauri filesystem authority | High — future Core must serve Tauri and Qt without renderer-private crypto semantics | High | High — durability, migration, and identity binding protect user data | High | **Highest — cross-renderer security/durability contract** | **3 — S5-A design admitted, S5-B2 admitted; two blocking child contracts (S5-B1, S5-B3) remain** | **S5_A_ADMITTED=YES / S5_B2_ADMITTED=YES / S5_IMPLEMENTATION_READY=NO / S5_TERMINAL=NO**; inventory, identity/AAD envelope, key epochs, fail-closed reads, durable replacement, crash-resumable migration, unified admission, and race-free `AuthoritySnapshot` acquisition/lifetime (`docs/native/r15/AUTHORITY-SNAPSHOT-LIFETIME.md`) are specified. Canonical Migration Source & Payload Evidence (S5-B1) and the chunked large-object envelope for records above 64 MiB (S5-B3) remain explicit fail-closed gates, not designed here. No production authority switch or plaintext migration is claimed. | S5-B1 and S5-B3 admitted and merged; then headless Core vectors, fault-injection tests, per-record migration tests, packaged durability evidence, and explicit #357/#359/#360/#361 reconciliation required before implementation gates can close |
</code_context>
<issue_to_address>
**issue:** The updated ledger row says S5-B1 and S5-B3 remain blocking child contracts, but its evidence column still says `S5-B1, S5-B2, and S5-B3 admitted and merged`. The migration ledger consequently reports the remaining gates as already merged.
**Triggers:** When the migration ledger is used to determine which S5 gates remain open.
**Suggested fix:** Change the evidence text to state that S5-B2 is admitted and merged while S5-B1 and S5-B3 remain open.
```suggestion
| 10 | R-15 protected desktop storage contract | **Design only (S5-A baseline)**, `docs/native/R15-SECURE-STORAGE-CONTRACT.md`; current desktop records remain TS/Tauri filesystem authority | High — future Core must serve Tauri and Qt without renderer-private crypto semantics | High | High — durability, migration, and identity binding protect user data | High | **Highest — cross-renderer security/durability contract** | **3 — S5-A design admitted, S5-B2 admitted; two blocking child contracts (S5-B1, S5-B3) remain** | **S5_A_ADMITTED=YES / S5_B2_ADMITTED=YES / S5_IMPLEMENTATION_READY=NO / S5_TERMINAL=NO**; inventory, identity/AAD envelope, key epochs, fail-closed reads, durable replacement, crash-resumable migration, unified admission, and race-free `AuthoritySnapshot` acquisition/lifetime (`docs/native/r15/AUTHORITY-SNAPSHOT-LIFETIME.md`) are specified. Canonical Migration Source & Payload Evidence (S5-B1) and the chunked large-object envelope for records above 64 MiB (S5-B3) remain explicit fail-closed gates, not designed here. No production authority switch or plaintext migration is claimed. | S5-B2 is admitted and merged; S5-B1 and S5-B3 remain open |
```
</issue_to_address>
### Comment 3
<location path="docs/native/r15/AUTHORITY-SNAPSHOT-LIFETIME.md" line_range="209-211" />
<code_context>
+ (no permanent leak from guards that are properly released).
+- A process-restart test proving no in-memory guard state is assumed, expected, or required to
+ survive a restart, and that reclamation after restart proceeds from §5.5's durable rule alone.
+- Update the parent contract's §5.3.3 "S5-B2 blocker" paragraph to reference this document as
+ admitted, replacing the blocking language with a pointer to §2 of this document, once this
+ document itself merges and is post-merge green.
+
+## 7. Non-goals
</code_context>
<issue_to_address>
**nitpick:** The child contract is already merged into the parent by this diff, yet its required-proof checklist still instructs a future update of the parent blocker paragraph only after the child document merges and is post-merge green. This leaves the admitted contract containing a stale, apparently outstanding admission step and makes checklist completion ambiguous.
**Triggers:** When reviewers or implementers use §6 to verify whether all pre-production S5-B2 work is complete.
**Suggested fix:** Mark the parent-contract update requirement as completed, or rewrite it as a historical integration requirement rather than an outstanding proof item.
```suggestion
- The parent contract's §5.3.3 "S5-B2 blocker" paragraph was updated to reference this document as
admitted, replacing the blocking language with a pointer to §2 of this document as part of this
document's integration.
```
</issue_to_address>Sourcery assessment
Approval pending. 2 findings to address first.
Blocking findings: docs/native/R15-SECURE-STORAGE-CONTRACT.md:7, docs/native/CORE-MIGRATION-LEDGER.md:20
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Actionable comments posted: 4
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Inline comments:
In `@docs/native/R15-SECURE-STORAGE-CONTRACT.md`:
- Line 740: Update the earlier reader algorithm to define step 2 as guard :=
acquire_authority_snapshot_guard(), then remove the stale S5-B2 blocker
statement that says capture and retention are not atomic. Keep the admitted
AuthoritySnapshotGuard acquisition as the single normative definition and
preserve the existing retention requirements.
In `@docs/native/r15/AUTHORITY-SNAPSHOT-LIFETIME.md`:
- Around line 73-75: Document the publication ordering in commit_new_root: make
the in-memory current replacement occur at the contract’s sole step-F
publication point, after the new root is durably committed, so readers after F
acquire the new handle. Also specify crash recovery behavior for current,
including that an in-memory update is lost on process failure and startup
reconstructs the cell from the durable committed root.
- Around line 156-160: Update the reclamation eligibility language and the
corresponding restart discussion to require all defined conditions, including an
admitted or durable condition 3, in addition to zero guard references; do not
state that condition 1 alone or condition 1 plus zero references is sufficient.
Preserve the distinction that eligibility permits, but does not require,
physical deletion.
- Around line 130-138: Update the AuthoritySnapshotGuard retention rules to pin
every generation reachable from its pinned AuthoritySnapshot, not only the
single RootGenerationHandle. Add transitive or per-generation pin accounting so
generations remain ACTIVE_READER_PIN-protected after root replacement and until
the guard is released, and cover the two-commit sequence where a child leaves
the current, previous, and prepared roots.
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Closes the exact gap PR #564's S5-A baseline left as an explicit blocker: the reader algorithm's snapshot-capture and retention- reference-registration steps were not specified as one atomic operation, so a reader descheduled between them could have its retention reference arrive after the generation it named was already reclaimed. Admits AuthoritySnapshotGuard: acquire_authority_snapshot_guard() reads the current committed-root generation handle and increments its reference count as one operation indivisible with respect to a concurrent root commit's replacement of that handle. Specifies the publication ordering for the in-memory current cell relative to the parent contract's step-F durable commit, and that it holds no state across a restart (repopulated from the durable committed_root at startup, before any guard can be acquired). Extends reclamation eligibility transitively: a guard-pinned root generation stays retained regardless of how many further commits have occurred since acquisition, and catalog/marker/data generations reachable from it inherit retention through the parent contract's existing "referenced by a retained root" rule - no new per-child pin accounting is introduced. Makes explicit that all three reclamation conditions (durable retention, zero guard references, and any other admitted recovery reason) must hold together, including after a restart. Updates the parent contract's reader-algorithm steps 2/7, S5-B2 blocker paragraph, header status flags, and section 21 to record S5_B2_ADMITTED = YES, and the migration ledger's row 10 accordingly. S5-B1 and S5-B3 remain open.
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Summary
AuthoritySnapshotacquisition between snapshot capture and retention-reference registration.docs/native/r15/AUTHORITY-SNAPSHOT-LIFETIME.mddefinesAuthoritySnapshotGuard:acquire_authority_snapshot_guard()reads the current committed-root generation handle and increments its reference count as one operation indivisible with respect to a concurrent root commit's replacement of that handle. A reference-counted handle behind one lock/atomic swap (Arc/ArcSwap) provides this without hazard pointers or RCU.docs/native/R15-SECURE-STORAGE-CONTRACT.md's S5-B2 blocker paragraph, header status flags, and §21 to recordS5_B2_ADMITTED = YES; updatesCORE-MIGRATION-LEDGER.mdrow 10 accordingly.S5_TERMINALstill requires all three.Design only — no implementation, no production authority switch, no change to any other S5-A section.
Test plan
pnpm run docs:check/pnpm run ci:prepushgreenSummary by Sourcery
Admit the S5-B2 contract for race-free AuthoritySnapshot acquisition without changing implementation status or production authority.
New Features:
AuthoritySnapshotGuardlifetime and acquisition contract for concurrent root commits and readers.Enhancements:
Documentation:
Tests:
CodeAnt-AI Description
Admit the race-free AuthoritySnapshot lifetime contract
What Changed
AuthoritySnapshotGuardcontract that captures the current storage generation and keeps it retained as one indivisible operation during concurrent root commits.Impact
✅ Race-free snapshot acquisition✅ Fewer reader/reclamation races✅ Clearer storage migration readiness💡 Usage Guide
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