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import pytest
from collections import namedtuple
from unittest import mock
from unittest.mock import call
from cloudinit.cmd.devel.hotplug_hook import handle_hotplug
from cloudinit.distros import Distro
from cloudinit.event import EventType
from cloudinit.net.activators import NetworkActivator
from cloudinit.net.network_state import NetworkState
from cloudinit.sources import DataSource
from cloudinit.stages import Init
hotplug_args = namedtuple('hotplug_args', 'udevaction, subsystem, devpath')
FAKE_MAC = '11:22:33:44:55:66'
@pytest.yield_fixture
def mocks():
m_init = mock.MagicMock(spec=Init)
m_distro = mock.MagicMock(spec=Distro)
m_datasource = mock.MagicMock(spec=DataSource)
m_datasource.distro = m_distro
m_init.datasource = m_datasource
m_init.fetch.return_value = m_datasource
read_sys_net = mock.patch(
'cloudinit.cmd.devel.hotplug_hook.read_sys_net_safe',
return_value=FAKE_MAC
)
m_network_state = mock.MagicMock(spec=NetworkState)
parse_net = mock.patch(
'cloudinit.cmd.devel.hotplug_hook.parse_net_config_data',
return_value=m_network_state
)
m_activator = mock.MagicMock(spec=NetworkActivator)
select_activator = mock.patch(
'cloudinit.cmd.devel.hotplug_hook.activators.select_activator',
return_value=m_activator
)
sleep = mock.patch('time.sleep')
read_sys_net.start()
parse_net.start()
select_activator.start()
m_sleep = sleep.start()
yield namedtuple('mocks', 'm_init m_network_state m_activator m_sleep')(
m_init=m_init,
m_network_state=m_network_state,
m_activator=m_activator,
m_sleep=m_sleep,
)
read_sys_net.stop()
parse_net.stop()
select_activator.stop()
sleep.stop()
class TestUnsupportedActions:
def test_unsupported_subsystem(self, mocks):
with pytest.raises(
Exception,
match='cannot handle events for subsystem: not_real'
):
handle_hotplug(
hotplug_init=mocks.m_init,
devpath='/dev/fake',
subsystem='not_real',
udevaction='add'
)
def test_unsupported_udevaction(self, mocks):
with pytest.raises(ValueError, match='Unknown action: not_real'):
handle_hotplug(
hotplug_init=mocks.m_init,
devpath='/dev/fake',
udevaction='not_real',
subsystem='net'
)
class TestHotplug:
def test_succcessful_add(self, mocks):
init = mocks.m_init
mocks.m_network_state.iter_interfaces.return_value = [{
'mac_address': FAKE_MAC,
}]
handle_hotplug(
hotplug_init=init,
devpath='/dev/fake',
udevaction='add',
subsystem='net'
)
init.datasource.update_metadata_if_supported.assert_called_once_with([
EventType.HOTPLUG
])
mocks.m_activator.bring_up_interface.assert_called_once_with('fake')
mocks.m_activator.bring_down_interface.assert_not_called()
init._write_to_cache.assert_called_once_with()
def test_successful_remove(self, mocks):
init = mocks.m_init
mocks.m_network_state.iter_interfaces.return_value = [{}]
handle_hotplug(
hotplug_init=init,
devpath='/dev/fake',
udevaction='remove',
subsystem='net'
)
init.datasource.update_metadata_if_supported.assert_called_once_with([
EventType.HOTPLUG
])
mocks.m_activator.bring_down_interface.assert_called_once_with('fake')
mocks.m_activator.bring_up_interface.assert_not_called()
init._write_to_cache.assert_called_once_with()
def test_update_event_disabled(self, mocks, caplog):
init = mocks.m_init
init.update_event_enabled.return_value = False
handle_hotplug(
hotplug_init=init,
devpath='/dev/fake',
udevaction='remove',
subsystem='net'
)
assert 'hotplug not enabled for event of type' in caplog.text
init.datasource.update_metadata_if_supported.assert_not_called()
mocks.m_activator.bring_up_interface.assert_not_called()
mocks.m_activator.bring_down_interface.assert_not_called()
init._write_to_cache.assert_not_called()
def test_update_metadata_failed(self, mocks):
mocks.m_init.datasource.update_metadata_if_supported.return_value = \
False
with pytest.raises(
RuntimeError, match='Datasource .* not updated for event hotplug'
):
handle_hotplug(
hotplug_init=mocks.m_init,
devpath='/dev/fake',
udevaction='remove',
subsystem='net'
)
def test_detect_hotplugged_device_not_detected_on_add(self, mocks):
mocks.m_network_state.iter_interfaces.return_value = [{}]
with pytest.raises(
RuntimeError,
match='Failed to detect {} in updated metadata'.format(FAKE_MAC)
):
handle_hotplug(
hotplug_init=mocks.m_init,
devpath='/dev/fake',
udevaction='add',
subsystem='net'
)
def test_detect_hotplugged_device_detected_on_remove(self, mocks):
mocks.m_network_state.iter_interfaces.return_value = [{
'mac_address': FAKE_MAC,
}]
with pytest.raises(
RuntimeError,
match='Failed to detect .* in updated metadata'
):
handle_hotplug(
hotplug_init=mocks.m_init,
devpath='/dev/fake',
udevaction='remove',
subsystem='net'
)
def test_apply_failed_on_add(self, mocks):
mocks.m_network_state.iter_interfaces.return_value = [{
'mac_address': FAKE_MAC,
}]
mocks.m_activator.bring_up_interface.return_value = False
with pytest.raises(
RuntimeError, match='Failed to bring up device: /dev/fake'
):
handle_hotplug(
hotplug_init=mocks.m_init,
devpath='/dev/fake',
udevaction='add',
subsystem='net'
)
def test_apply_failed_on_remove(self, mocks):
mocks.m_network_state.iter_interfaces.return_value = [{}]
mocks.m_activator.bring_down_interface.return_value = False
with pytest.raises(
RuntimeError, match='Failed to bring down device: /dev/fake'
):
handle_hotplug(
hotplug_init=mocks.m_init,
devpath='/dev/fake',
udevaction='remove',
subsystem='net'
)
def test_retry(self, mocks):
with pytest.raises(RuntimeError):
handle_hotplug(
hotplug_init=mocks.m_init,
devpath='/dev/fake',
udevaction='add',
subsystem='net'
)
assert mocks.m_sleep.call_count == 5
assert mocks.m_sleep.call_args_list == [
call(1), call(3), call(5), call(10), call(30)
]
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