Function git_program

src/mcp/hook_events.rs:353–373

Resolves the `git` executable to an absolute path exactly once per process. Under heavy parallel test load (nextest spawns one process per test, each spawning several `git` subprocesses), a bare `Command::new("git")` PATH lookup can transiently fail the spawn with `ENOENT` ("No such file or directory") even though git is installed. Resolving to an absolute path up front, plus a `GIT` env override,

()

    /// Resolving to an absolute path up front, plus a `GIT` env override,
    /// removes the per-spawn PATH walk and makes the lookup deterministic.
    fn git_program() -> std::ffi::OsString {
        use std::sync::OnceLock;
        static GIT: OnceLock<std::ffi::OsString> = OnceLock::new();
        GIT.get_or_init(|| {
            if let Some(explicit) = std::env::var_os("GIT") {
                return explicit;
            }
            let exe_name = if cfg!(windows) { "git.exe" } else { "git" };
            if let Some(paths) = std::env::var_os("PATH") {
                for dir in std::env::split_paths(&paths) {
                    let candidate = dir.join(exe_name);
                    if candidate.is_file() {
                        return candidate.into_os_string();
                    }
                }
            }
            // Fall back to a bare name and let the OS resolve it.
            std::ffi::OsString::from("git")
        })
        .clone()
    }

    fn run_git(cwd: &Path, args: &[&str]) {
        // A cwd that does not yet exist makes the spawn itself fail with