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πŸ›‘οΈ Sentinel: [λ³΄μ•ˆ κ°œμ„ ] 파일 μ“°κΈ° μ‹œ μ›μžμ (Atomic) ꡐ체 적용 - #281

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πŸ›‘οΈ Sentinel: [λ³΄μ•ˆ κ°œμ„ ] 파일 μ“°κΈ° μ‹œ μ›μžμ (Atomic) ꡐ체 적용#281
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sentinel/atomic-move-13656010329942583966

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@seonghobae seonghobae commented Jul 26, 2026

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  • src/main/kotlin/html4tree/main.kt: write_index_file ν•¨μˆ˜μ— ATOMIC_MOVE 적용 및 μ˜ˆμ™Έ μ‹œ fallback 처리 둜직 μΆ”κ°€.
  • src/test/kotlin/html4tree/MainTest.kt: testWriteIndexFileAtomicMoveFallback 및 testWriteIndexFileDefaultFallbackLambda λ“± μ˜ˆμ™Έ 및 λ””ν΄νŠΈ νŒŒλΌλ―Έν„° λΆ„κΈ° 컀버λ₯Ό μœ„ν•œ ν…ŒμŠ€νŠΈ μΌ€μ΄μŠ€ μΆ”κ°€ (JaCoCo 100% λͺ…λ Ήμ–΄ 컀버리지 달성).
  • .jules/sentinel.md: μ›μžμ  파일 ꡐ체와 κ΄€λ ¨λœ ν•™μŠ΅ λ‚΄μš© 기둝.

PR created automatically by Jules for task 13656010329942583966 started by @seonghobae

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λ³΄μ•ˆ ν–₯상: index.html 생성 μ‹œ μ›μžμ  ꡐ체(Atomic Move) 적용
a153851 
파일 μ“°κΈ° 쀑 λ°œμƒν•  수 μžˆλŠ” Race Condition 및 TOCTOU 취약점을 λ°©μ§€ν•˜κΈ° μœ„ν•΄ 파일 ꡐ체λ₯Ό `StandardCopyOption.ATOMIC_MOVE`둜 μˆ˜ν–‰ν•©λ‹ˆλ‹€. μ‹œμŠ€ν…œ 미지원 μ‹œ κΈ°μ‘΄ `REPLACE_EXISTING`으둜 fallback ν•˜λ„λ‘ κ΅¬ν˜„ν–ˆμŠ΅λ‹ˆλ‹€. ν…ŒμŠ€νŠΈ 컀버리지 100%λ₯Ό λ‹¬μ„±ν•˜κΈ° μœ„ν•΄ λžŒλ‹€ 기반의 λ””ν΄νŠΈ νŒŒλΌλ―Έν„°λ₯Ό μ‚¬μš©ν–ˆμŠ΅λ‹ˆλ‹€.
Copilot AI review requested due to automatic review settings July 26, 2026 21:18
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  • src/main/kotlin/html4tree/main.kt
  • src/test/kotlin/html4tree/MainTest.kt
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Pull request overview

This PR improves the robustness of index.html generation by attempting an atomic file replacement when writing index files, falling back safely when atomic moves aren’t supported. It also adds tests to cover the new fallback branches and records the related security learning in the Jules notes.

Changes:

  • Update write_index_file to try StandardCopyOption.ATOMIC_MOVE first and fall back on AtomicMoveNotSupportedException.
  • Add unit tests covering atomic-move fallback and default-parameter branches to maintain 100% JaCoCo coverage.
  • Document the atomic replacement learning in .jules/sentinel.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File Description
src/main/kotlin/html4tree/main.kt Attempt atomic move for index replacement with a fallback path when unsupported.
src/test/kotlin/html4tree/MainTest.kt Add tests to cover the new atomic-move fallback and default lambda branches.
.jules/sentinel.md Record learning about atomic replacement; wording needs a small accuracy tweak.

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Comment thread .jules/sentinel.md
Comment on lines +88 to +90
**Vulnerability:** 파일 ꡐ체 μ‹œ `REPLACE_EXISTING`만 μ‚¬μš©ν•˜λ©΄ ꡐ체 μˆœκ°„μ— λΆˆμ™„μ „ν•œ 파일 μƒνƒœκ°€ λ…ΈμΆœλ˜κ±°λ‚˜ TOCTOU 취약점이 λ°œμƒν•  수 μžˆμŠ΅λ‹ˆλ‹€.
**Learning:** 파일 ꡐ체 μž‘μ—…μ€ μ›μžμ (Atomic)으둜 μˆ˜ν–‰λ˜μ–΄μ•Ό ν•˜λ©°, μ‹œμŠ€ν…œμ—μ„œ μ§€μ›ν•˜μ§€ μ•Šμ„ κ²½μš°μ—λ§Œ 일반 볡사/μ΄λ™μœΌλ‘œ 폴백해야 μ•ˆμ „ν•œ μƒνƒœ μ „ν™˜μ„ 보μž₯ν•  수 μžˆμŠ΅λ‹ˆλ‹€.
**Prevention:** 파일 μ—…λ°μ΄νŠΈ μ‹œ `StandardCopyOption.ATOMIC_MOVE`λ₯Ό μš°μ„ μ μœΌλ‘œ μ‹œλ„ν•˜κ³ , μ‹€νŒ¨(`AtomicMoveNotSupportedException`)ν•  κ²½μš°μ—λ§Œ `REPLACE_EXISTING`으둜 ν΄λ°±ν•˜λ„λ‘ κ΅¬ν˜„ν•˜μ‹­μ‹œμ˜€.
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seonghobae commented Aug 5, 2026

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Closing as superseded by draft canonical #296. The same atomic move and fallback branches are retained there under an accurate reliability contract. #296 must still update to post-#363 master, add deterministic all-old/all-new and cleanup/failure tests, complete JaCoCo branches, KDoc, APA 7 doctoring, changelog, exact-head checks, and independent approval. No result from this duplicate head is reused.

@seonghobae seonghobae closed this Aug 5, 2026
@google-labs-jules

google-labs-jules Bot commented Aug 5, 2026

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Closing as superseded by draft canonical #296. The same atomic move and fallback branches are retained there under an accurate reliability contract. #296 must still update to post-#363 master, add deterministic all-old/all-new and cleanup/failure tests, complete JaCoCo branches, KDoc, APA 7 doctoring, changelog, exact-head checks, and independent approval. No result from this duplicate head is reused.

Understood. Acknowledging that this work is now superseded by #296 and stopping work on this task.

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