@classmethod
def iter_items(cls, client, common_path=None):
    """Find all references in the repository."""
    refs_path = path = client.renku_path / cls.REFS
    if common_path:
        path = path / common_path
    for name in path.rglob('*'):
        if name.is_dir():
            continue
        yield cls(client=client, name=str(name.relative_to(refs_path)))
