def get_committed_signatures(vcs):
committed_path = _get_committed_history_path(vcs)<EOL>known_signatures = []<EOL>if os.path.exists(committed_path):<EOL><INDENT>with open(committed_path, '<STR_LIT:r>') as f:<EOL><INDENT>known_signatures = f.read().split()<EOL><DEDENT><DEDENT>return known_signatures<EOL>
Get the list of committed signatures

    Args:
        vcs (easyci.vcs.base.Vcs)

    Returns:
        list(basestring) - list of signatures