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Devin FoleyandPaperclip
d6d67b00d3
## Thinking Path Paperclip runs background workspace scans alongside real Git writers. `git status` can refresh the index as an optional side effect, taking a lock that makes another operation fail. Disable optional locking in the shared scan subprocess so background observation does not compete with workspace updates. ## Linked Issues or Issue Description **What existing behavior does this improve?** Workspace Git scans used by changed-file browsing, cleanliness guards, and sandbox snapshots. **Current behavior** The scan process inherits Git's default optional-lock behavior. Even a clean `status` can rewrite stale stat-cache entries in the index and contend with a concurrent writer. **Proposed behavior** Always set `GIT_OPTIONAL_LOCKS=0` for the shared scan subprocess while preserving the selected environment and Git's required write locks. **Reason and benefit** Background reads stop creating avoidable index contention. Git documents this behavior and recommends disabling optional locks for background status: [background refresh](https://git-scm.com/docs/git-status#_background_refresh). **Breaking changes** None to scan results or required write locking. Later scans may repeat stat checks that would otherwise have been cached in the index. Related scan implementation: #11572, #14253. This avoids one known contention source; it does not identify every historical lock owner or repair abandoned locks. ## What Changed - Disable optional locking at the shared scan subprocess boundary, including explicit caller environments. - Test a clean status against a deliberately stale index and prove an ordinary status would rewrite it. - Test tracked/untracked results with an existing index lock, preservation of that lock and working files, and continued rejection of a mandatory-lock write. - Document the scan behavior and performance tradeoff. ## Verification - Focused stream, workspace-sync, and scheduler suites: 63 tests passed. - Full `pnpm -r typecheck` and `pnpm build` passed locally. Final head `effe6420c77bd18d36af6b093db3a564c04b8b38` passed all 53 CI checks, including complete test coverage, typecheck, build, and browser/runner gates; two unrelated checks intentionally skipped. - Full local test attempts initially had missing embedded-Postgres library symlinks; the dependency setup was repaired. Duplicate local full-suite runs were stopped after full CI completed. This PR does not claim a completed full local suite. - Review regression: real Git honors the supplied `GIT_CONFIG_*` setting and the input environment remains unchanged; all four direct subprocess cases passed. - Reviewed the diff for secrets, customer data, and internal references. ## Risks Low risk. Disabling optional index refresh can repeat filesystem stat work on later scans. Required locks remain enforced; no lock is removed, no failed reset is retried, and workspace mutation guards are unchanged. No schema changes. ## Model Used OpenAI GPT-6 via Codex, with repository inspection, code execution, and tests. Exact model build identifier is not exposed by this session. ## Checklist - [x] Thinking path and model are specified - [x] Checked ROADMAP.md; this is a maintenance correction, not planned feature work - [x] Searched for duplicate and related PRs - [x] Described the issue using the enhancement template - [x] No internal issue references, customer data, or private instance links - [x] Descriptive branch name - [x] Focused regression tests pass - [x] Added tests and updated documentation - [x] Risks documented - [x] Required validation and CI gates are green (full suite validated in CI; local scope documented above) - [x] Greptile is 5/5 with no unresolved findings - [x] I will address review comments before requesting merge --------- Co-authored-by: Paperclip <noreply@paperclip.ing>