def METHOD_NAME(cls, location: str) -> str:
    """
    Return the changeset identification hash, as a 40-character
    hexadecimal string
    """
    current_rev_hash = cls.run_command(
        ["parents", "--template={node}"],
        show_stdout=False,
        stdout_only=True,
        cwd=location,
    ).strip()
    return current_rev_hash