feat(read-file): record read scope and report clipping separately (U4, #1375) by easonLiangWorldedtech · Pull Request #1913 · Zoo-Code-Org/Zoo-Code

easonLiangWorldedtech · 2026-10-05T12:09:08Z

Split unit U4 of #1833, under the plan on this issue (5993969784 / 5994039786 / 5994053776). Base is U2 (#1912) per the merge order.

Scope (one gate scope): the read side — what a read records about its own scope, and reporting truncation and clipping as two separate notices.

Content source of record: kind: commit, base 7c291bb08 → head 6768ccfaf, replayed on the current main tip 9af61f87e so this branch carries nothing that main already has.

Budget (own delta, not the stacked view): 932 a+d / 105 changed executable lines. Inside both caps.

Verification at this head: 203 passed across the four suites this unit touches (readFileTool 97, indentation-reader, McpHub, Task.dispose + observationRegistry); ESLint --max-warnings=0 clean on every file in the unit; Prettier clean; src/eslint-suppressions.json never increased.

The GitHub view also carries the unmerged base, so the numbers above are this unit's own delta.

Related GitHub Issue

Closes: #1375 (part 4 of 9 — read-scope recording and separate clipping reporting; see the tracking issue for the unit map and merge order U1 U2 U3 U4 U5 U8 U6 U7 U9). Split plan of record: easonLiangWorldedtech#41.

Description (how)

indentation-reader separates "lines clipped in this view" from "lines omitted from this view", and the native/legacy read paths report the two notices independently.
ReadFileTool brackets each read with a bigint fs.stat pair and observes the target only when both tokens match, recording complete so a slice/truncated/lossy view never authorizes a full-file replacement. A stat failure leaves the target unobserved and never fails the read.
Task owns a per-instance ObservationRegistry; Task.disposeOnce() retires it (close()) so a read that resumes after disposal cannot repopulate it, and both read paths skip the post-read stat + observation work once task.abort is set.
Project-scoped MCP settings writes pass confineTo (the provider cwd, falling back to getWorkspacePath()); global writes stay unconstrained by design. Same change as 256091d3c on fws/u3 (feat(task): observation registry with read completeness (U3, #1375) #1912) — the unit branches are not cumulative, so each branch carrying the writer needs its own copy.

How to test

pnpm --dir src test -- core/tools/__tests__/readFileTool.spec.ts integrations/misc/__tests__/indentation-reader.spec.ts services/mcp/__tests__/McpHub.spec.ts core/task/__tests__/Task.dispose.test.ts core/task/__tests__/observationRegistry.spec.ts
pnpm --dir src exec tsc --noEmit
Manual check: point a workspace at a repo that ships .roo/mcp.json as a symlink to a file outside the workspace, toggle a project tool's always-allow / change its timeout / delete a project server, and confirm the write is refused instead of replacing the outside file.
Environment: Ubuntu 22.04 and Windows 11 runners; the symlink cases are skipped on win32 in the unit tests and verified manually.

Pre-Submission Checklist

Issue Linked: linked to the approved epic [EPIC] File Write Safety Prevent Concurrent Write Races Data Corruption #1375 via the split plan on VPS2 durable per-view state - independent-fix series (supersedes #34 + the 21-item upstream draft series) easonLiangWorldedtech/Zoo-Code#41.
Scope: read-side observation + clipping reporting only; the MCP confinement rows are the same finding re-raised against this branch because this branch carries the writer.
Self-Review: reviewed against the current head, not the reviewed head.
Testing: regression tests added at the lowest layer that would have failed, each pinned by a local negative control (mutate the production line → test fails → restore → passes).
Visual Snapshots: n/a — no user-visible rendered state changed.
Documentation Impact: considered, see below.
Contribution Guidelines: read and agreed.

Documentation Updates

No user-facing documentation updates are required. The confineTo caller contract for safeWriteJson and the ObservationRegistry.close() semantics are documented in the code (JSDoc at McpHub.confineForMcpWrite and observationRegistry.close).

Additional Notes

mutation-diff is advisory here; a changed-executable-line cap on a split unit is a maintainer-side decision (see the plan comment 6062420602 on VPS2 durable per-view state - independent-fix series (supersedes #34 + the 21-item upstream draft series) easonLiangWorldedtech/Zoo-Code#41) — this stack will not split again.
The backup: true copy-vs-move trade-off and the version-guard enforcement boundary are recorded once on the plan issue rather than re-argued per unit.

Get in Touch

Discord: not available for this automation account — please use the PR thread or the tracking issue easonLiangWorldedtech#41.

coderabbitai · 2026-10-05T12:09:16Z

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src/core/tools/ReadFileTool.ts
src/core/tools/__tests__/readFileTool.spec.ts
src/services/file-safety/__tests__/safeWriteText.spec.ts
src/services/file-safety/safeWriteText.ts

Priority: ➖ Normal

Change: Feature

Merge Risk: 🔵 Low · up to 5596f

A cancelled read can briefly leave stale read state. Recheck cancellation before recording observations; the bounded lifecycle risk does not otherwise prevent merging.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to a1b98

Read authorization remains intact, but JSON writes now follow file symlinks. A project configuration update can therefore modify configuration outside that project, including global tool-approval settings, when a workspace-controlled link points there.

Retained concerns

Medium · security · inferred: Project MCP updates inherit newly expanded write scope. If workspace .roo/mcp.json is a symlink to global MCP settings, a project-scoped tool-approval or server-setting action now changes the global referent rather than replacing the project link as the base did. The inspected caller authorizes the logical project source but does not check or obtain approval for the resolved destination. This creates a conditional cross-project configuration-integrity and approval-policy concern.

Security review details

Security Blast Radius

inferred — The new write exposure is local to destinations writable by the extension process, but is not limited to the logical project configuration path. A controlled file symlink can redirect a compatible configuration update to global MCP settings, making its effects persist across projects. Workspace-link control and an update action are required; automatic remote exploitation was not established.

Security Findings and Attack Paths

inferred — A project mcp.json link to an existing global MCP configuration is read as project configuration. A project-scoped always-allow toggle then passes that same logical path to safeWriteJson, which now publishes onto the global referent. Reading through links predates the PR; mutation of the referent through this JSON publication path is the introduced change.

Trust Boundaries and Controls

observed — Read-file access retains RooIgnore filtering and approval before processing approved files. Publication rejects dangling terminal symlinks and non-regular caller staging files. These controls do not authorize an existing resolved destination against a project boundary.

Resilience and Maintainability Implications

observed — Canonical advisory locks coordinate JSON writers using symlink aliases and referents. The general withFileLock helper still uses lexical path identity; equivalent coordination for every maintenance caller was not established, although the inspected task-history deletion caller uses its normal task-file path.

Hardening Proposals

proposed — Keep intentional symlink support in the general writer, but require project configuration callers to authorize the resolved destination: reject destinations outside the project policy boundary or obtain explicit destination-specific consent before publication.

🚥 Pre-merge checks | ✅ 6 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Regression Evidence	⚠️ Warning	The under-lock confinement guard lacks focused coverage. `safeWriteJson` checks the resolved target again after acquiring the lock (src/utils/safeWriteJson.ts:190-205) because a peer can change a syml…	Add a focused `safeWriteJson` test at the utility layer. Make the first confinement resolution remain inside the scope, then make the in-lock resolution escape the scope, for example by controlling the realpath sequence or swapping a symlin…
Lifecycle Resource Cleanup	⚠️ Warning	The changed read-observation path can perform work and record an observation after cancellation. In both native and legacy reads, `ReadFileTool.ts` checks `task.abort` before awaiting the new post-rea…	Re-check `task.abort` after the awaited post-read `fs.stat` and immediately before token comparison and `observationRegistry.observe()` in both read paths. Prefer a cancellation-aware guard or close the observation registry synchronously wh…

✅ Passed checks (6 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	For the U4 objectives of `#1375`, `ReadFileTool` records a version only when pre-read and post-read bigint stat tokens match. It records `complete: false` for slices, truncation, clipping, indentation r…
Out of Scope Changes check	✅ Passed	The changed writer code and tests support `#1375` file-safety behavior and the stated MCP `confineTo` implementation. The read changes implement the declared U4 scope. The supplied change summary shows …
Security Boundaries	✅ Passed	No changed path meets the security failure condition. ReadFileTool keeps RooIgnore validation and user approval before reading; its changes add stat-based observation and clipping metadata only. safeW…
Persistence Integrity	✅ Passed	No changed persistence path meets the failure condition. `safeWriteText` fully writes and fsyncs staging content before `fs.rename`, and it fsyncs the parent directory after commit. It reports a post-…
Title check	✅ Passed	The title clearly summarizes the primary read-side changes: recording read scope and reporting clipping separately. The U4 and issue references add useful context without making the title vague.
Description check	✅ Passed	The description is complete and follows the repository template. It identifies the linked issue, explains the implementation, lists reproducible tests and environments, completes the checklist, and do…

Full details: Regression Evidence

Explanation

The under-lock confinement guard lacks focused coverage. safeWriteJson checks the resolved target again after acquiring the lock (src/utils/safeWriteJson.ts:190-205) because a peer can change a symlink referent between the pre-lock check and publication. The tests cover static out-of-scope paths, symlink resolution, and the pre-lock ordering (src/utils/tests/safeWriteJson.test.ts:669-815), but no test changes the target between those two checks and asserts ConfinedPathEscapeError before merge or staging. This leaves a concrete security error branch unverified.

Resolution

Add a focused safeWriteJson test at the utility layer. Make the first confinement resolution remain inside the scope, then make the in-lock resolution escape the scope, for example by controlling the realpath sequence or swapping a symlink while the mocked lock is held. Assert that the call rejects with ConfinedPathEscapeError, releases the lock, does not invoke the merge callback, and creates no temporary file or publish operation.

Full details: Lifecycle Resource Cleanup

Explanation

The changed read-observation path can perform work and record an observation after cancellation. In both native and legacy reads, ReadFileTool.ts checks task.abort before awaiting the new post-read fs.stat (lines 242-247 and 880-885), but does not check it again afterward. If abortTask() sets task.abort = true while that stat is pending, the stat and observationRegistry.observe() still run. abortTask() starts disposal asynchronously only after an awaited webview flush (Task.ts lines 3261-3295), so the registry can be repopulated before disposeOnce() closes it. This is duplicate post-cancellation work on a changed lifecycle path.

Resolution

Re-check task.abort after the awaited post-read fs.stat and immediately before token comparison and observationRegistry.observe() in both read paths. Prefer a cancellation-aware guard or close the observation registry synchronously when cancellation starts, so an in-flight read cannot perform post-read observation work after cancellation.

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github-actions · 2026-10-05T12:09:29Z

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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.

codecov · 2026-10-05T12:53:06Z

Codecov Report

❌ Patch coverage is 94.79167% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/utils/safeWriteJson.ts	78.26%	4 Missing and 6 partials ⚠️
src/services/file-safety/safeWriteText.ts	97.34%	1 Missing and 4 partials ⚠️

📢 Thoughts on this report? Let us know!

easonLiangWorldedtech · 2026-10-05T12:56:42Z

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coderabbitai · 2026-10-05T12:56:51Z

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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.

… 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.

The any usage this entry covered is gone in the rewritten file, so the count drops 4 -> 3. eslint --prune-suppressions --max-warnings=0 confirms it.

The read tools record the observed on-disk version through task.observationRegistry, but the field was only declared in a later unit, so at this head the call dereferences undefined and the mocked e2e run fails on the read_file smoke tests. The registry is introduced by this unit, so the field belongs here. tsc clean on this unit, 11 observationRegistry tests pass, ESLint --max-warnings=0 clean.

The two any usages this entry covered are gone in the rewritten spec, so the count drops 98 -> 96. eslint --prune-suppressions --max-warnings=0 confirms it.

Security Boundaries: safeWriteJson resolves the publish target through realpath before staging beside it, so a repository that ships .roo/mcp.json as a symlink to a file OUTSIDE the workspace has that outside file replaced as soon as the user edits a project MCP setting, deletes a server, or toggles tool always-allow. The three project-capable write sites passed no confinement option, and the base implementation renamed the link itself, so the external write is introduced here. confineForMcpWrite(source) returns the provider cwd (falling back to getWorkspacePath) for project writes and undefined for global ones - global settings live in the user's own settings directory, which is deliberately not confined. All three sites now pass it, so the write fails closed with ConfinedPathEscapeError instead of touching the referent. This is the same change as 256091d on fws/u3-observation-completeness (Zoo-Code-Org#1912); the unit branches are not cumulative, so every branch that carries the writer needs its own copy. Regression Evidence: the per-Task registry now fails closed on teardown too - disposeOnce() clears it, so a disposed Task still reachable through a parent/subtask reference cannot hand a token captured before teardown to a guarded write. Two McpHub tests pin the call sites (a project-scoped allowlist write carries confineTo = workspace root, a global one does not) and a Task.dispose test pins the clear. The two-real-Task registry test added in 87986e9 already covers the distinctness the checklist row asked for. Local: vitest McpHub + Task.dispose 89 passed. Negative controls: helper mutated to return undefined -> project confine test fails; clear() commented out -> disposal test fails; both restore green. tsc --noEmit 50 errors before and after the change (unchanged branch baseline). eslint 0 errors / 0 warnings on all four files, no suppression entry added or increased.

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Inline comments:
Review comments at @src/services/mcp/__tests__/McpHub.spec.ts:
- Around line 1023-1044: Add a negative test for project-scoped writes through
toggleToolAlwaysAllow using the real safeWriteJson writer and a symlinked
.roo/mcp.json target outside the workspace. Verify the write is rejected and the
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Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...

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🔇 Additional comments (4)

src/core/task/Task.ts (2)

290-292: LGTM!

3379-3384: LGTM!

src/core/task/__tests__/Task.dispose.test.ts (1)

6-6: LGTM!

Also applies to: 122-162

src/services/mcp/McpHub.ts (1)

2411-2414: Cover getMcpSettingsFilePath and updateServerToolList consistently.

updateServerToolList passes normalizedPath (backslashes replaced with forward slashes on Windows) to safeWriteJson, with confineTo taken from the workspace root. safeWriteJson calls path.resolve on the path first, so the separators are normalized before the scope check. No defect found here.

…every MCP confine site Lifecycle Resource Cleanup: disposeOnce() cleared the registry, but a read that was already awaiting fs.readFile when disposal began resumed afterwards and recorded the file again - the disposed Task was authoritative once more, and it kept doing the new post-read stat work for a turn that will never be acted on. ObservationRegistry.close() now drops the entries AND refuses later observations, Task.disposeOnce() calls close(), and both ReadFileTool paths skip the post-read stat + observe work when task.abort is set (checked before the awaited stat, not after it). Regression Evidence: the confinement fix touched three call sites but only toggleToolAlwaysAllow was pinned. updateServerTimeout and deleteServer now have a project case (confineTo = workspace root) and a global case (confineTo undefined) each; the connection double is shared at describe scope so all four sites use one typed fixture. safeWriteJson is mocked in this file, so a lower-level writer test cannot see a missing MCP argument - each call site has to be pinned here. Tests: 2 closure tests (close drops entries and reports closed; observe is a no-op after close), 2 aborted-task tests (native and legacy path record nothing), 4 call-site confinement tests, and the disposal test extended to assert the registry stays empty when a late observation arrives. Local: 203 passed across readFileTool, McpHub, Task.dispose and observationRegistry. Negative controls, each mutate -> test fails -> restore -> passes: ReadFileTool guard neutered, ObservationRegistry closure guard neutered (fails both the registry spec and the Task disposal test), and close() downgraded to clear() (fails the disposal test). tsc --noEmit 50 errors before and after (unchanged branch baseline, 0 in touched files). eslint 0 errors / 0 warnings across all 8 touched files; no suppression entry changed.

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Inline comments:
Review comments at @src/core/tools/ReadFileTool.ts:
- Line 247: Recheck `task.abort` after the awaited post-read `fs.stat` and
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src/core/tools/ReadFileTool.ts

🔇 Additional comments (1)

src/services/mcp/__tests__/McpHub.spec.ts (1)

148-163: LGTM!

Also applies to: 1023-1059, 1062-1087, 1091-1092

The abort guard sat before the post-read fs.stat, so a cancellation that lands while that stat is in flight still recorded an observation - for a run that will never act on the read, and into a registry that disposal has already retired. Both paths now re-check task.abort after the await and before observe(); the read itself still answers the model. Two tests flip task.abort inside the pending post-read stat, one per path, and assert observe() was never called and the registry stayed empty.

Port of the Zoo-Code-Org#1917 fix into this unit: the unit branches are not cumulative, so this branch carries its own copy of safeWriteText's lock-key helper and the same defect. canonicalDirKey() canonicalized only the immediate parent and fell back to that literal spelling on ENOENT. A writer whose parent directory already existed canonicalized through a symlinked ancestor (or a Windows short name) while a writer racing to create the same directory got the literal path, so the two took different locks for one file and a read-modify-write lost one side. It now walks up to the nearest ancestor that exists, canonicalizes that, and re-joins the missing components; a realpath failure that is not ENOENT is propagated instead of being papered over with a key that may be wrong. Identifiers and comments are kept identical to the other units so the merge resolves trivially.

easonLiangWorldedtech · 2026-10-08T18:42:03Z

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… the write A defect reported on a sibling PR in the base repo: the backup destination is named before the copy runs, while the rollback cleanup keys off a flag that only becomes true once the copy succeeded - so a copyFile that fails after creating the destination leaves a half-written .bak beside the target forever. This branch does not have that shape. The whole backup creation (seed open with "wx", copyFile, chmod, fsync) is wrapped in a catch that unlinks the destination and clears backupPath before rethrowing, so the cleanup keys off the attempt rather than off the success. What was missing is coverage for the exact case the report describes: copyFile failing with the destination already created. Only the fsync-failure variant was tested. No production change. Negative control: deleting the cleanup unlink inside that catch fails exactly two tests - this one and the existing "a failed backup flush is reported and leaves no partial backup behind" - and restoring it leaves the file byte-identical.

easonLiangWorldedtech · 2026-10-08T20:02:18Z

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easonLiangWorldedtech · 2026-10-08T20:19:42Z

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No source change. CodeRabbit's change_assessment_commit for this PR has been frozen at 5596f3a since 15:30 across three heads (949c263, f1fb1b2, 7dec01b): three accepted "@coderabbitai full review" requests (18:42:03, 20:02:18, 20:19:42) each re-rendered the summarize against the OLD assessment and produced no review object at head, while the same pool produced a real at-head verdict for another PR minutes later. The auto-review that a push schedules recomputes the assessment for the new head, which the manual request does not.

easonLiangWorldedtech requested review from JamesRobert20, edelauna, navedmerchant and taltas as code owners October 5, 2026 12:09

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This was referenced Oct 5, 2026

feat(tools): guarded write core under the shared lock (U5, #1375) #1914

Open

[EPIC] File Write Safety Prevent Concurrent Write Races Data Corruption #1375

Open

split unit U1 of PR 1833 (issue 1375)

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easonLiangWorldedtech force-pushed the fws/u4-read-scope-recording branch from 60b9221 to bb64d87 Compare October 5, 2026 12:55

easonLiangWorldedtech force-pushed the fws/u4-read-scope-recording branch from bb64d87 to 6dd95ce Compare October 5, 2026 13:15

easonLiangWorldedtech added 2 commits October 5, 2026 22:30

rebuild unit u2 on the fixed chain

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easonLiangWorldedtech force-pushed the fws/u4-read-scope-recording branch from 6dd95ce to 5bdf5b0 Compare October 5, 2026 14:39

easonLiangWorldedtech added 5 commits October 5, 2026 22:47

chore(lint): prune the safeWriteJson suppression this unit earns

625a976

The any usage this entry covered is gone in the rewritten file, so the count drops 4 -> 3. eslint --prune-suppressions --max-warnings=0 confirms it.

rebuild unit u3 on the fixed chain

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rebuild unit u4 on the fixed chain

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chore(lint): prune the readFileTool.spec suppression this unit earns

d7eab3d

The two any usages this entry covered are gone in the rewritten spec, so the count drops 98 -> 96. eslint --prune-suppressions --max-warnings=0 confirms it.

easonLiangWorldedtech force-pushed the fws/u4-read-scope-recording branch from 5bdf5b0 to d7eab3d Compare October 5, 2026 14:51

This was referenced Oct 5, 2026

feat(tools): track read completeness and guard the diff-view save path (S4b, #1375) #1833

Closed

mutation-diff charges a stacked unit the whole unmerged chain #1923

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