def succeed(*cmds):
    """Returns the concatenated output of all cmds"""
    return machine.succeed(*cmds)


def assert_matches(cmd, regexp):
    out = succeed(cmd)
    if not re.search(regexp, out):
        raise Exception(f"Pattern '{regexp}' not found in '{out}'")


def assert_matches_exactly(cmd, regexp):
    out = succeed(cmd)
    if not re.fullmatch(regexp, out):
        raise Exception(f"Pattern '{regexp}' doesn't match '{out}'")


def log_has_string(unit, str):
    return f"journalctl -b --output=cat -u {unit} --grep='{str}'"


def assert_no_failure(unit):
    """Unit should not have failed since the system is running"""
    machine.fail(log_has_string(unit, "Failed with result"))


def assert_running(unit):
    machine.wait_for_unit(unit)
    assert_no_failure(unit)


# Don't execute the following test suite when this script is running in interactive mode
if "is_interactive" in vars():
    raise Exception()