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# Copyright 2012 Michael Still
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from unittest import mock
import fixtures
from nova import test
from nova.virt.disk.mount import loop
from nova.virt.image import model as imgmodel
def _fake_noop(*args, **kwargs):
return
class LoopTestCase(test.NoDBTestCase):
def setUp(self):
super(LoopTestCase, self).setUp()
self.file = imgmodel.LocalFileImage("/some/file.qcow2",
imgmodel.FORMAT_QCOW2)
@mock.patch('nova.privsep.fs.loopsetup', return_value=('/dev/loop0', ''))
@mock.patch('nova.privsep.fs.loopremove')
def test_get_dev(self, mock_loopremove, mock_loopsetup):
tempdir = self.useFixture(fixtures.TempDir()).path
mount = loop.LoopMount(self.file, tempdir)
# No error logged, device consumed
self.assertTrue(mount.get_dev())
self.assertTrue(mount.linked)
self.assertEqual('', mount.error)
self.assertEqual('/dev/loop0', mount.device)
# Free
mount.unget_dev()
self.assertFalse(mount.linked)
self.assertEqual('', mount.error)
self.assertIsNone(mount.device)
@mock.patch('nova.privsep.fs.loopsetup', return_value=('', 'doh'))
def test_inner_get_dev_fails(self, mock_loopsetup):
tempdir = self.useFixture(fixtures.TempDir()).path
mount = loop.LoopMount(self.file, tempdir)
# No error logged, device consumed
self.assertFalse(mount._inner_get_dev())
self.assertFalse(mount.linked)
self.assertNotEqual('', mount.error)
self.assertIsNone(mount.device)
# Free
mount.unget_dev()
self.assertFalse(mount.linked)
self.assertIsNone(mount.device)
@mock.patch('nova.privsep.fs.loopsetup', return_value=('', 'doh'))
def test_get_dev_timeout(self, mock_loopsetup):
tempdir = self.useFixture(fixtures.TempDir()).path
mount = loop.LoopMount(self.file, tempdir)
self.useFixture(fixtures.MonkeyPatch('time.sleep', _fake_noop))
self.useFixture(fixtures.MonkeyPatch(('nova.virt.disk.mount.api.'
'MAX_DEVICE_WAIT'), -10))
# Always fail to get a device
def fake_get_dev_fails():
return False
mount._inner_get_dev = fake_get_dev_fails
# Fail to get a device
self.assertFalse(mount.get_dev())
@mock.patch('nova.privsep.fs.loopremove')
def test_unget_dev(self, mock_loopremove):
tempdir = self.useFixture(fixtures.TempDir()).path
mount = loop.LoopMount(self.file, tempdir)
# This just checks that a free of something we don't have doesn't
# throw an exception
mount.unget_dev()
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