from pathlib import Path

from tests.integration_tests.instances import IntegrationInstance
from tests.integration_tests.util import ASSETS_DIR


PICKLE_PATH = Path('/var/lib/cloud/instance/obj.pkl')
TEST_PICKLE = ASSETS_DIR / 'test_version_change.pkl'


def _assert_no_pickle_problems(log):
    assert 'Failed loading pickled blob' not in log
    assert 'Traceback' not in log
    assert 'WARN' not in log


def test_reboot_without_version_change(client: IntegrationInstance):
    log = client.read_from_file('/var/log/cloud-init.log')
    assert 'Python version change detected' not in log
    assert 'Cache compatibility status is currently unknown.' not in log
    _assert_no_pickle_problems(log)

    client.restart()
    log = client.read_from_file('/var/log/cloud-init.log')
    assert 'Python version change detected' not in log
    assert 'Could not determine Python version used to write cache' not in log
    _assert_no_pickle_problems(log)

    # Now ensure that loading a bad pickle gives us problems
    client.push_file(TEST_PICKLE, PICKLE_PATH)
    client.restart()
    log = client.read_from_file('/var/log/cloud-init.log')
    assert 'Failed loading pickled blob from {}'.format(PICKLE_PATH) in log


def test_cache_purged_on_version_change(client: IntegrationInstance):
    # Start by pushing the invalid pickle so we'll hit an error if the
    # cache didn't actually get purged
    client.push_file(TEST_PICKLE, PICKLE_PATH)
    client.execute("echo '1.0' > /var/lib/cloud/data/python-version")
    client.restart()
    log = client.read_from_file('/var/log/cloud-init.log')
    assert 'Python version change detected. Purging cache' in log
    _assert_no_pickle_problems(log)


def test_log_message_on_missing_version_file(client: IntegrationInstance):
    # Start by pushing a pickle so we can see the log message
    client.push_file(TEST_PICKLE, PICKLE_PATH)
    client.execute("rm /var/lib/cloud/data/python-version")
    client.restart()
    log = client.read_from_file('/var/log/cloud-init.log')
    assert (
        'Writing python-version file. '
        'Cache compatibility status is currently unknown.'
    ) in log