Function git_path::absolutize

pub fn absolutize<'a>(
    path: impl Into<Cow<'a, Path>>,
    current_dir: Option<impl Into<PathBuf>>
) -> Cow<'a, Path>

Resolve relative components virtually without accessing the file system, e.g. turn a/./b/c/.././.. into a, without keeping intermediate .. and /a/../b/.. becomes /. Note that we might access the current_dir if we run out of path components to pop off. If unset, we continue which might lead to an invalid/uninteded path.