Function staged_ids 

pub fn staged_ids(
    index_path: &Path,
    hash: Kind,
    paths: &[Vec<u8>],
) -> Result<Staged>

The object ids the index records for paths.

No lock is taken: git replaces the index by renaming a complete file over it, so a reader sees one version or the other and never a half-written one. forget_stat locks because it writes.

Errors

Error::Io when the index exists but cannot be read. An index that does not exist yet is not an error — nothing is tracked, so every answer is None.