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Isolate arg0 helper directories by operating system - #53412
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## Why Windows and WSL can share `CODEX_HOME` without sharing a lock namespace, allowing cleanup to remove another platform's live helpers. Older clients can also clean helpers stored under the shared `tmp/arg0` root. ## What changed Create helpers under `CODEX_HOME/tmp/arg0-<os>` and limit stale-directory cleanup to that operating system's root. Keep permission discovery compatible with both the current platform's root and legacy `tmp/arg0` directories, while ignoring other platforms' aliases. ## Testing Add regression coverage for cleanup isolation, live helper preservation during legacy cleanup, and selection of the first session alias directory from either supported root. GitOrigin-RevId: f34292748b5b1d3c25629604d849db4b133dfa3a
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Isolate arg0 helper directories by operating system
Why
Windows and WSL can share
CODEX_HOMEwithout sharing a lock namespace, allowing cleanup to remove another platform's live helpers. Older clients can also clean helpers stored under the sharedtmp/arg0root.What changed
Create helpers under
CODEX_HOME/tmp/arg0-<os>and limit stale-directory cleanup to that operating system's root. Keep permission discovery compatible with both the current platform's root and legacytmp/arg0directories, while ignoring other platforms' aliases.Testing
Add regression coverage for cleanup isolation, live helper preservation during legacy cleanup, and selection of the first session alias directory from either supported root.