feat(read-file): record read scope and report clipping separately (U4, #1375) - #1913
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📝 SummarySummary by CodeRabbit
WalkthroughThe change adds task-local file observations and read-completeness reporting. It adds staged text publication with backup and rollback handling, then updates ChangesFile read observations
Safe text and JSON writes
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ReadFileTool
participant FileSystem
participant ObservationRegistry
ReadFileTool->>FileSystem: stat before read
ReadFileTool->>FileSystem: read file
ReadFileTool->>FileSystem: stat after read
ReadFileTool->>ObservationRegistry: record matching version token and completeness
sequenceDiagram
participant safeWriteJson
participant proper-lockfile
participant safeWriteText
participant FileSystem
safeWriteJson->>FileSystem: resolve lock key
safeWriteJson->>proper-lockfile: acquire lock
safeWriteJson->>FileSystem: resolve target and read merge content
safeWriteJson->>safeWriteText: publish staged JSON with backup enabled
safeWriteText->>FileSystem: rename staged file and sync parent directory
safeWriteJson->>proper-lockfile: release lock
Merge Risk: 🔵 Low · up to The read-file clipping notice can wrongly tell the model that a whole file was read when only a later slice was returned. A stale backup file may also remain after a directory-fsync failure. Both issues are minor, and the change is mergeable with follow-up. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to 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
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, 1 warning)
✅ Passed checks (5 passed)
Full details: Regression EvidenceExplanation The changed staging-path guard has an untested negative branch. Resolution Add a Full details: Security BoundariesExplanation The new write path trusts an unvalidated symlink target. Resolution Validate the canonical publish target against an allowed destination for each caller, and reject symlinks whose referents fall outside that destination. For project MCP configuration, do not publish outside the workspace’s Full details: Persistence IntegrityExplanation The new Resolution Keep the canonical target present until the staged file can replace it atomically. If the old content must also be retained, create and durably flush a backup without moving the target before commit. Alternatively, add recovery that detects and restores an interrupted backup before consumers read the target. ✨ Finishing Touches🧪 Generate unit tests (beta)
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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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…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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… 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.
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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.
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…rtion This unit was rebuilt from the pre-fix content source, so its copy of safeWriteText.ts still restored the backup over a write whose commit rename had already succeeded when the parent-directory fsync failed, and its spec asserted rmdir generically rather than against the staging directory this write created. Both are already settled in unit 1 (fws/u1-atomic-publish). Taking those files here keeps the shared code byte-identical across the units, so merging the chain in order does not overwrite unit 1's fix. Tests: 52 passed in safeWriteText.spec.ts.
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Inline comments:
Review comments at @src/core/tools/ReadFileTool.ts:
- Around line 364-365: Update the clipped-lines notice assigned to output using
MAX_LINE_LENGTH so source-code indentation is not included in the rendered text;
add the line break explicitly before result.content and preserve the existing
notice and content.
Review comments at @src/services/file-safety/__tests__/safeWriteText.spec.ts:
- Around line 1051-1052: Update the rollback-failure test to verify that
fs.rmdir removes the exact staging directory created by fsSync.mkdirSync. Reuse
the established staging-path assertion pattern from the nearby test, and ensure
the unlink assertion also identifies that staging path.
Review comments at @src/services/file-safety/safeWriteText.ts:
- Line 425: In safeWriteText, remove the backup before throwing
PostCommitDurabilityError when the post-commit directory fsync fails. Reuse the
existing releaseBackupOnSuccess and backupPath state, and keep the cleanup
limited to this committed durability-failure path.
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src/core/task/Task.tssrc/core/task/__tests__/observationRegistry.spec.tssrc/core/task/observationRegistry.tssrc/core/tools/ReadFileTool.tssrc/core/tools/__tests__/readFileTool.spec.tssrc/eslint-suppressions.jsonsrc/integrations/misc/__tests__/indentation-reader.spec.tssrc/integrations/misc/indentation-reader.tssrc/services/file-safety/__tests__/safeWriteText.spec.tssrc/services/file-safety/safeWriteText.tssrc/utils/__tests__/safeWriteJson.lockKey.spec.tssrc/utils/__tests__/safeWriteJson.test.tssrc/utils/safeWriteJson.ts
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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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src/utils/__tests__/safeWriteJson.lockKey.spec.ts
[warning] 102-102: Filesystem path is not a string literal; a request-/variable-derived path can enable path traversal. Validate and normalize the path before use.
Context: fs.readFile(referent, "utf8")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
(detect-non-literal-fs-filename-typescript)
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/utils/safeWriteJson.ts
[warning] 97-97: Filesystem path is not a string literal; a request-/variable-derived path can enable path traversal. Validate and normalize the path before use.
Context: fs.readFile(resolvedTargetPath, "utf8")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
(detect-non-literal-fs-filename-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/core/tools/ReadFileTool.ts
[warning] 238-238: Mutation test advisory
src/core/tools/ReadFileTool.ts:238: 2 mutation test gaps; example: Survived ObjectLiteral mutant (replacement: {}). See the job summary for the complete list and resolution guidance.
[warning] 220-220: Mutation test advisory
src/core/tools/ReadFileTool.ts:220: 2 mutation test gaps; example: Survived ObjectLiteral mutant (replacement: {}). See the job summary for the complete list and resolution guidance.
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src/core/tools/ReadFileTool.ts:355: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.
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src/services/file-safety/safeWriteText.ts
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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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🔇 Additional comments (11)
src/core/task/observationRegistry.ts (1)
1-59: LGTM!src/core/task/Task.ts (1)
114-114: LGTM!Also applies to: 290-293
src/core/task/__tests__/observationRegistry.spec.ts (1)
1-108: LGTM!src/integrations/misc/indentation-reader.ts (1)
61-64: LGTM!Also applies to: 311-311, 454-466, 477-477
src/integrations/misc/__tests__/indentation-reader.spec.ts (1)
2-2: LGTM!Also applies to: 283-321, 335-342
src/core/tools/ReadFileTool.ts (1)
218-247: LGTM!Also applies to: 818-831, 851-880
src/core/tools/__tests__/readFileTool.spec.ts (1)
1513-2271: LGTM!src/eslint-suppressions.json (1)
979-979: LGTM!Also applies to: 1719-1719
src/utils/safeWriteJson.ts (1)
59-98: LGTM!Also applies to: 109-140, 151-165, 175-175
src/utils/__tests__/safeWriteJson.lockKey.spec.ts (1)
1-183: LGTM!src/utils/__tests__/safeWriteJson.test.ts (1)
317-341: LGTM!Also applies to: 443-487, 565-704
…s notice The template literal continued on an indented source line, so the model-facing output carried four leading tabs before the content. Replace the indented newline with an explicit escape so the notice and the content are separated by a single newline and nothing else. Local note: readFileTool.spec.ts cannot run in this worktree (isbinaryfile is not resolvable from either node_modules here); CI covers it.
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
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @src/core/tools/ReadFileTool.ts:
- Line 364: Update the clipping notice in the output construction branch to
describe the returned slice rather than claiming the whole file was read; use
the available start-line value such as offset1 and state that the slice reaches
EOF.
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🔇 Additional comments (2)
src/services/file-safety/safeWriteText.ts (1)
50-50: LGTM!src/services/file-safety/__tests__/safeWriteText.spec.ts (1)
352-370: LGTM!Also applies to: 569-589, 1094-1096
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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.
…eturned A slice that starts after line 1 and reaches EOF is not truncated, so the branch said "The file was read in full" even though the earlier lines were omitted. Name the slice start when the read did not begin at line 1, and add a focused test for that case. Local note: readFileTool.spec.ts cannot run in this worktree (isbinaryfile is not resolvable from either node_modules here) and ESLint cannot resolve its config here; CI covers both.
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This unit's copy of ApplyPatchTool still recorded complete: true when the model had no prior observation, which is the behaviour already fixed on Zoo-Code-Org#1910/Zoo-Code-Org#1911/Zoo-Code-Org#1912/Zoo-Code-Org#1913/Zoo-Code-Org#1914 and on Zoo-Code-Org#1915: the tool's own hunk read is not a model read, so it cannot grant authority for a later full-file replacement. Tests updated to match, including the move case where the completeness flag is now false. Local note: this spec cannot run in this worktree (the 'diff' package is not resolvable from either node_modules here) and ESLint cannot resolve its config here; CI covers both.
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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, base7c291bb08→ head6768ccfaf, replayed on the current main tip9af61f87eso 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: 94 passed (readFileTool) and 48 passed (indentation-reader); 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.