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feat: if .codex is a sub-folder of a writable root, then make it read-only to the sandbox

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Michael Bolin
2025-12-15 22:36:03 -08:00
parent 412dd37956
commit 9121bbcab0
3 changed files with 228 additions and 66 deletions
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docs/config.md
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@@ -316,7 +316,7 @@ disk, but attempts to write a file or access the network will be blocked.
A more relaxed policy is `workspace-write`. When specified, the current working directory for the Codex task will be writable (as well as `$TMPDIR` on macOS). Note that the CLI defaults to using the directory where it was spawned as `cwd`, though this can be overridden using `--cwd/-C`.
On macOS (and soon Linux), all writable roots (including `cwd`) that contain a `.git/` folder _as an immediate child_ will configure the `.git/` folder to be read-only while the rest of the Git repository will be writable. This means that commands like `git commit` will fail, by default (as it entails writing to `.git/`), and will require Codex to ask for permission.
On macOS (and soon Linux), all writable roots (including `cwd`) that contain a `.git/` or `.codex/` folder _as an immediate child_ will configure those folders to be read-only while the rest of the root stays writable. This means that commands like `git commit` will fail, by default (as it entails writing to `.git/`), and will require Codex to ask for permission.
```toml
# same as `--sandbox workspace-write`