Function git_accepts 

pub fn git_accepts(
    scratch: &Path,
    name: &str,
    pack: &[u8],
    how: Strictness,
) -> Result<()>

Hand pack to stock git, inside a repository, and return its verdict.

Ok(()) means git accepted it. Err names why, and — the part this module exists for — an oracle that crashed is an Err that says so, instead of an exit code nobody looks at behind an empty stderr.