⚡ Bolt: 디렉토리 탐색 중 불필요한 os.lstat() 호출 최적화#143
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media_shrinker.py의 find_candidates 함수에서 제외(exclude) 규칙이 없을 때도 모든 디렉토리에 대해 os.lstat()을 호출하여 발생하던 불필요한 파일 시스템 I/O 오버헤드를 제외 규칙이 설정된 경우에만 호출되도록 조건문 내부로 이동시켜 성능을 개선했습니다. 또한 lstat 실패 상황을 다루는 테스트 코드도 이 조건을 통과하도록 수정하여 100% 테스트 커버리지를 유지했습니다.
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Pull request overview
This PR optimizes find_candidates() directory traversal by avoiding unnecessary os.lstat() calls when no exact exclusion paths are configured, reducing filesystem I/O overhead during os.walk().
Changes:
- Move per-directory
os.lstat()(symlink detection) behind theexcluded_exact_strsguard so it only runs when exact exclude rules are present. - Update the unit test to pass a dummy
exclude_pathsentry to ensure the directory symlink-check path is exercised under the patchedos.lstat. - Document the performance learning in
.jules/bolt.md.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| media_shrinker.py | Avoids unconditional os.lstat() on every directory during traversal unless exact excludes are configured. |
| tests/test_media_shrinker.py | Adjusts the test setup to keep covering the directory os.lstat()/symlink-check behavior after the optimization. |
| .jules/bolt.md | Adds a note capturing the optimization principle and rationale for future reference. |
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Pull request overview
OpenCode exhausted the configured model pool without a usable current-head review conclusion. This is not approval evidence, so the PR is blocked until a source-backed review can establish approval sufficiency or identify concrete fixes.
Findings
1. HIGH .jules/bolt.md:1 - OpenCode could not establish approval sufficiency
- Problem: every configured model path failed to produce a usable current-head control block.
- Root cause: model execution, timeout, export, normalization, or approval-gate validation did not complete after exponential retry across the configured model pool.
- Impact: approving from deterministic check state alone would miss PR-intent mismatches, missing files, edge-case bugs, robustness gaps, UX/DX regressions, security issues, and CodeGraph-backed base/head flow changes.
- Fix: rerun OpenCode after model availability recovers, or update the PR with the missing files, tests, docs, generated artifacts, and verification evidence needed for a source-backed review conclusion.
- Regression test: keep the approval gate posting REQUEST_CHANGES, not APPROVE or check-only failure, when no model produces a valid current-head review.
Summary
- Result: REQUEST_CHANGES
- Reason: coverage-evidence passed and peer GitHub Checks completed without failures, but no model produced a valid review control block.
- Deterministic evidence checked but not used for approval: current-head changed-file evidence (.jules/bolt.md, media_shrinker.py, tests/test_media_shrinker.py); coverage-evidence result success; peer checks from statusCheckRollup excluding this OpenCode check.
- Model outcome: model_pool=exhausted; selected_model=none.
- Head SHA:
db367d98444b75a081ba1cd03c5be0dae71d18fa - Workflow run: 28547212747
- Workflow attempt: 1
No PR approval was posted because model-output failure is not evidence that the PR has no blockers.
Changed-File Evidence Map
flowchart LR
PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
Evidence --> S1["Changed file (2 files)"]
S1 --> I1["repository behavior"]
I1 --> R1["Review risk: Changed file (2 files)"]
R1 --> V1["required checks"]
Evidence --> S2["Test: test_media_shrinker.py"]
S2 --> I2["regression suite"]
I2 --> R2["Review risk: Test: test_media_shrinker.py"]
R2 --> V2["targeted test run"]
| ## 2026-06-25 - [Optimize Path.exists() when paired with stat()] | ||
| **Learning:** Checking `Path.exists()` before `Path.stat()` introduces a redundant system call because `exists()` internally uses `stat()`. | ||
| **Action:** Rely on catching the `OSError` from `Path.stat()` to simultaneously check for existence and retrieve file attributes, saving measurable I/O overhead on large filesystems. | ||
| ## 2026-06-26 - [Minimize os.lstat() overhead during directory traversal] |
There was a problem hiding this comment.
HIGH OpenCode could not establish approval sufficiency
- Problem: the model pool exhausted without a valid current-head review control block, so this changed line cannot be approved from deterministic check state alone.
- Impact: PR-intent mismatches, missing files, robustness bugs, UX/DX regressions, and CodeGraph-backed flow changes could be missed.
- Fix: rerun OpenCode after model availability recovers, or add the missing source/test/docs/generated verification evidence needed for a source-backed approval.
- Verification: rerun the OpenCode Review workflow and confirm it emits APPROVE or source-backed REQUEST_CHANGES for this head SHA.
OpenCode Review Overview
Pull request overviewOpenCode exhausted the configured model pool without a usable current-head review conclusion. This is not approval evidence, so the PR is blocked until a source-backed review can establish approval sufficiency or identify concrete fixes. Findings1. HIGH .jules/bolt.md:1 - OpenCode could not establish approval sufficiency
Summary
No PR approval was posted because model-output failure is not evidence that the PR has no blockers. Changed-File Evidence Mapflowchart LR
PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
Evidence --> S1["Changed file (2 files)"]
S1 --> I1["repository behavior"]
I1 --> R1["Review risk: Changed file (2 files)"]
R1 --> V1["required checks"]
Evidence --> S2["Test: test_media_shrinker.py"]
S2 --> I2["regression suite"]
I2 --> R2["Review risk: Test: test_media_shrinker.py"]
R2 --> V2["targeted test run"]
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💡 수행한 작업 (What):
media_shrinker.py파일의find_candidates함수 내에서 디렉토리를 탐색(os.walk)할 때, 명시적인 제외 경로(exclude_paths)가 설정되지 않았음에도 모든 디렉토리에 대해os.lstat()함수가 무조건 호출되고 있었습니다. 이os.lstat()호출을 실제 제외 경로 검사가 필요한if excluded_exact_strs:블록 내부로 이동시켰습니다.이에 따라 관련 단위 테스트(
test_find_candidates_skips_entries_when_symlink_check_fails) 역시 제외 규칙이 하나 이상 존재하도록 수정하여os.lstat호출 경로가 정상적으로 테스트되도록 보장했습니다.🎯 해결한 문제 (Why):
디렉토리 트리를 순회할 때 발생하는 불필요한 파일 시스템 I/O(특히
os.lstat())는 성능 병목의 주요 원인이 됩니다. 제외할 경로 목록이 비어 있는 대다수의 일반적인 탐색 상황에서도 모든 서브 디렉토리를 순회할 때마다 상태 정보를 읽어오는 무의미한 오버헤드가 발생하고 있었습니다. 이번 변경으로 이를 제거하여 전반적인 탐색 속도를 최적화했습니다.📊 성능 개선 효과 (Impact):
🔬 검증 방법 (Measurement):
python3 -m unittest discover -s tests를 실행하여 모든 유닛 테스트가 통과하는지 확인했습니다.python3 -m coverage run -m unittest discover -s tests && python3 -m coverage report -m실행을 통해 100% 테스트 커버리지를 검증하여 사이드 이펙트나 예외 처리 누락이 없음을 입증했습니다.PR created automatically by Jules for task 13204267704769077234 started by @seonghobae