feat(file-safety): atomic text publish primitive (U1, #1375) - #1910
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📝 SummarySummary by CodeRabbit
WalkthroughAdds ChangesAtomic text publishing
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Caller
participant safeWriteText
participant FileSystem
Caller->>safeWriteText: Provide path, content, and options
safeWriteText->>FileSystem: Write and fsync staged content
opt Backup enabled
safeWriteText->>FileSystem: Rename existing target to backup
end
safeWriteText->>FileSystem: Rename staged file to target
opt Publish fails before commit
safeWriteText->>FileSystem: Restore backup
end
safeWriteText-->>Caller: Resolve or report publish error
Merge Risk: ⚪ Minimal · up to The repository provides a shared locking boundary for callers that need to serialize file writes, and no current in-repository caller is exposed to the uncoordinated rollback case. No actionable merge-blocking risk is established. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The new publishing primitive has useful single-writer recovery controls, but Windows access-control preservation can fail silently, and concurrent backup writes can undo another writer’s successful publication. No production integration was found, which limits current exposure. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
Caution Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional.
❌ Failed checks (2 errors, 2 warnings)
✅ Passed checks (4 passed)
Full details: Regression EvidenceExplanation Two changed behaviors lack focused regression coverage. Resolution Add focused tests at the unit-test layer. Run two Windows-platform writes and assert their DACL save dump paths differ, including the matching restore/cleanup paths. Add a caller-supplied staging-path test whose Full details: Security BoundariesExplanation The new Resolution Do not accept an arbitrary caller-selected sibling path as a staging file. Make the primitive create and own a private staging file, including for caller-provided streams, or require a staging capability that proves the file was created for this publish. Keep validation resistant to path replacement between validation and use. Full details: Persistence IntegrityExplanation The backup rollback is not made durable on POSIX. In Resolution After a successful rollback rename on POSIX, fsync the parent directory before treating rollback as complete. If that fsync fails, report an explicit rollback-durability partial failure that identifies the target and states that its directory entry may not survive a crash. Add tests for both the rollback directory-fsync order and its failure path. Full details: Lifecycle Resource CleanupExplanation The new backup lifecycle can leave an untracked backup file after a successful publish. In
✨ Finishing Touches🧪 Generate unit tests (beta)
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Review comments at @src/services/file-safety/__tests__/safeWriteText.spec.ts:
- Around line 498-524: Update the `safeWriteText` test to verify operation
order, not just `execFile` call arguments: use the mock invocation order to
assert the DACL save runs before the backup rename and the commit rename runs
before DACL restore. Keep the assertions focused on this sequence.
Review comments at @src/services/file-safety/safeWriteText.ts:
- Around line 330-334: Reuse the existing errorCode() helper for the ENOENT
checks in resolvePublishTarget and the catch block near the diff, removing both
inline error-code guards. Move errorCode() above resolvePublishTarget so it is
available before use, and preserve the existing behavior of rethrowing errors
whose code is not ENOENT.
- Around line 393-399: Update the failure cleanup flow in safeWriteText so a
failed rollback records the RollbackFailureError instead of throwing
immediately; then run the existing temp-file, staging-directory, and DACL-dump
cleanup before throwing the recorded rollback error, or the original error when
rollback succeeded. Keep the backup untouched.
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[warning] 2-2: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { execFile } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
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Context: import type { ChildProcess } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
src/services/file-safety/safeWriteText.ts
[warning] 3-3: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { execFile } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
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src/services/file-safety/safeWriteText.ts
[warning] 136-136: Mutation test advisory
src/services/file-safety/safeWriteText.ts:136: 6 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.
[warning] 113-113: Mutation test advisory
src/services/file-safety/safeWriteText.ts:113: 2 mutation test gaps; example: Survived ObjectLiteral mutant (replacement: {}). See the job summary for the complete list and resolution guidance.
[warning] 97-97: Mutation test advisory
src/services/file-safety/safeWriteText.ts:97: 2 mutation test gaps; example: Survived ObjectLiteral mutant (replacement: {}). See the job summary for the complete list and resolution guidance.
[warning] 63-63: Mutation test advisory
src/services/file-safety/safeWriteText.ts:63: 4 mutation test gaps; example: Survived StringLiteral mutant (replacement: ""). See the job summary for the complete list and resolution guidance.
[warning] 53-53: Mutation test advisory
src/services/file-safety/safeWriteText.ts:53: Survived StringLiteral mutant (replacement: ""). See the job summary for the complete list and resolution guidance.
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…ve (U1, issue 1375) Split unit U1 of PR 1833. Three changes, each with a test that fails without it: - a caller-supplied staging path is checked for location and file type before anything is written, so an arbitrary path or a symlink cannot be published onto the target; - a failed parent-directory fsync on POSIX is reported as PostCommitDurabilityError instead of being swallowed, so a successful return never claims durability the filesystem did not grant; - the staged file and this write's own staging directory are released before RollbackFailureError is thrown. Focused coverage for resolveLockKey added: canonical parent directory, a dangling-link chain, and termination at the bounded depth on a two-link cycle.
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Addressed at
48 tests pass at this head, and the four new-behaviour tests were verified to fail against the pre-fix file. Re-requesting review needs a human: this token cannot post it ( |
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…ishTarget (U1, issue 1375) The resolver may fall back to the given path only when lstat also reports the path as absent. An EACCES or EIO failure says nothing about whether the path is a link, so falling back would publish through a link we were not allowed to inspect. Focused tests added for both branches.
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One more finding closed at |
… type-sound
compile failed at the unit head on three points:
- RollbackFailureError needs a string backupPath, but the throw now happens after cleanup, so the
`string | null` narrowing was lost. The failure is now held as { error, backupPath }.
- The async lstat stand-in is built on the Stats prototype so it satisfies fsSync.Stats.
- The realpath/readlink mocks are typed to the real signatures; the readlink mock answers once
because only the link path is read.
tsc clean, 50 tests pass, ESLint --max-warnings=0 clean, no suppression change.
…ed publish The rollback ran whenever backup mode had renamed target -> backup, including when the failure happened AFTER the commit rename had already published the new content. The post-commit parent-directory fsync throws PostCommitDurabilityError, whose message tells the caller the content is at the target path, but the catch then renamed the backup back over that target. The caller was told one thing and the file held the other. A `committed` flag is set immediately after the commit rename, and the rollback is skipped once it is set. Only a pre-commit failure can restore the backup. Regression test at the lowest layer that would have failed: commit rename succeeds, the post-commit directory open fails, backup mode is on. It fails without the guard (1 failed | 50 passed) and passes with it. 51 tests pass; ESLint clean with --max-warnings=0 on both files.
Two review findings: - The error-code type guard was copied three times and the copies already behaved differently: errorCode() converts with String(...) while the inline copies returned the raw value. The two inline copies now call errorCode(). - The test titled "before backup rename" only checked arguments and call counts, so it passed even if the save ran after the rename. A new test records the actual call order and asserts save -> backup rename -> commit rename -> restore. Verified order-sensitive: a wrong expected order fails (1 failed | 51 passed). 52 tests pass; ESLint clean with --max-warnings=0 on both files.
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Taken. Pushed as |
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Taken. Pushed as |
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Not applicable at this head. The rollback-failure path already records the partial state and then runs the temp unlink, the staging-directory removal and the DACL dump unlink before throwing |
… call order The compile check failed on this PR's head. Two typing problems in the test added for the order finding: - the order was asserted by re-implementing the execFile and rename mocks, which does not match their declared signatures (PathLike parameters, execFile returns a ChildProcess); - the post-commit fsync test's openSync implementation typed its parameter as string, which is not assignable to PathLike. The order is now asserted through the mocks' invocationCallOrder, which is what the title claims and needs no re-implementation, and the openSync implementation uses the inferred PathLike parameter. Verified the order assertion is still sensitive: reversing the expected order fails (1 failed | 51 passed). 52 tests pass, tsc clean, ESLint clean with --max-warnings=0.
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safeWriteJson rethrows RollbackFailureError and the telemetry callers record only error.message, so the generic wrapper message lost the filesystem errno text of the publish failure. Include the publish error message while keeping the rollback context (publishError, rollbackError, backupPath) unchanged. Tests: 52 passed in safeWriteText.spec.ts, ESLint clean with --max-warnings=0.
… rollback failure The assertion accepted any rmdir argument, so a regression that removed a different directory still passed. Read this write's own staging directory from fsSync.mkdirSync and assert that exact path. Tests: 52 passed in safeWriteText.spec.ts, ESLint clean with --max-warnings=0.
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/services/file-safety/safeWriteText.ts:
- Around line 466-479: Replace the fixed `targetPath + ".acl.tmp"` path used for
`dumpPath` with a unique per-write path generated by `_tempName` in `dirPath`,
and update the ACL-path test assertions to match the generated
`.safeWriteText.acl_<...>.tmp` format.
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src/services/file-safety/__tests__/safeWriteText.spec.ts
[warning] 2-2: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { execFile } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] 3-3: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import type { ChildProcess } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
src/services/file-safety/safeWriteText.ts
[warning] 3-3: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { execFile } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
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src/services/file-safety/safeWriteText.ts
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src/services/file-safety/safeWriteText.ts:87: Survived StringLiteral mutant (replacement: ""). See the job summary for the complete list and resolution guidance.
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src/services/file-safety/__tests__/safeWriteText.spec.ts (1)
1-1134: LGTM!
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Review comments at @src/services/file-safety/safeWriteText.ts:
- Line 373: Update dumpPath in safeWriteText to use a unique per-write temporary
name in the target directory, preventing collisions with existing user files and
concurrent writes; update the spec’s .acl.tmp assertions to match the new name
shape.
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src/services/file-safety/__tests__/safeWriteText.spec.ts
[warning] 2-2: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { execFile } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] 3-3: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import type { ChildProcess } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
src/services/file-safety/safeWriteText.ts
[warning] 3-3: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { execFile } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
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src/services/file-safety/safeWriteText.ts
[warning] 90-90: Mutation test advisory
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🔇 Additional comments (1)
src/services/file-safety/__tests__/safeWriteText.spec.ts (1)
1-1134: LGTM!
The dump path was the fixed sibling <target>.acl.tmp. A pre-existing user file at that path is unlinked by the failed-save branch and by both cleanup paths, and two concurrent writes to the same target share one dump, so one write can restore or delete the other's. Use the per-write unique name like the staging file. Tests: 52 passed in safeWriteText.spec.ts, ESLint clean with --max-warnings=0.
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Split unit U1 of #1833, under the plan on this issue (5993969784 / 5994039786 / 5994053776). Base is main per the merge order.
Scope (one gate scope): the atomic publish primitive — write the backup, publish by rename, restore on failure, and report a failed rollback as its own error class.
Content source of record:
kind: commit, base7c291bb08→ head6768ccfaf, replayed on the current main tip9af61f87eso this branch carries nothing that main already has.Budget (own delta, not the stacked view): 1342 a+d / 420 changed executable lines. 1342 a+d is above the 1000 hard cap — documented deviation:
safeWriteText.tsis a new file and its spec tests that file as a unit, so the file and its tests cannot be separated without breaking the fidelity contract.Verification at this head: 42 passed; ESLint
--max-warnings=0clean on every file in the unit; Prettier clean;src/eslint-suppressions.jsonnever increased.The GitHub view also carries the unmerged base, so the numbers above are this unit's own delta.