Function repository_local 

pub fn repository_local(
    name: &str,
    path_var: Option<&OsStr>,
    cwd: &Path,
) -> Option<PathBuf>

Finds name through the RELATIVE entries of path_var, each resolved against cwd, in order; the first native (or, on Windows, unsupported) form wins. Absolute entries are skipped. Never runs anything.