def guess_contains_systemd(lines):
    """Tries to determine if a file includes systemd
    """
    for line in lines:
        if 'sd_bus_error_copy' in line:
            return 1
        if 'sd_bus_error_is_set' in line:
            return 1
        if 'sd_bus_error_add_map' in line:
            return 1
    return 0
