codex-rs/apply-patch/src/main.rs

pub fn main() -> ! {
    codex_apply_patch::main()
}
feat: use the arg0 trick with apply_patch (#2646) Historically, Codex CLI has treated `apply_patch` (and its sometimes misspelling, `applypatch`) as a "virtual CLI," intercepting it when it appears as the first arg to `command` for the `"container.exec", `"shell"`, or `"local_shell"` tools. This approach has a known limitation where if, say, the model created a Python script that runs `apply_patch` and then tried to run the Python script, we have no insight as to what the model is trying to do and the Python Script would fail because `apply_patch` was never really on the `PATH`. One way to solve this problem is to require users to install an `apply_patch` executable alongside the `codex` executable (or at least put it someplace where Codex can discover it). Though to keep Codex CLI as a standalone executable, we exploit "the arg0 trick" where we create a temporary directory with an entry named `apply_patch` and prepend that directory to the `PATH` for the duration of the invocation of Codex. - On UNIX, `apply_patch` is a symlink to `codex`, which now changes its behavior to behave like `apply_patch` if arg0 is `apply_patch` (or `applypatch`) - On Windows, `apply_patch.bat` is a batch script that runs `codex --codex-run-as-apply-patch %*`, as Codex also changes its behavior if the first argument is `--codex-run-as-apply-patch`. 2025-08-24 14:35:51 -07:00			`pub fn main() -> ! {`
			`codex_apply_patch::main()`
			`}`