3bb4b7c16d
I thought when I wrote the imagecache code for libvirt that the instance names were of a fixed format. That is not correct. First off the format is set in the instance_name_template flag. Worse than that, it can change over time and old instances are not renamed. So, now I check the database to see if the directory name is a valid instance name (for this machine). Change-Id: I318215aef5a10cee32959fd947ad628edff293a2
350 lines
14 KiB
Python
350 lines
14 KiB
Python
#!/usr/bin/python
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 Michael Still and Canonical Inc
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import hashlib
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import os
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import shutil
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import tempfile
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import time
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from nova import test
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from nova import db
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from nova import flags
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from nova import log as logging
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from nova.virt.libvirt import imagecache
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from nova.virt.libvirt import utils as virtutils
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flags.DECLARE('instances_path', 'nova.compute.manager')
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FLAGS = flags.FLAGS
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LOG = logging.getLogger(__name__)
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class ImageCacheManagerTestCase(test.TestCase):
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def setUp(self):
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super(ImageCacheManagerTestCase, self).setUp()
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self.stock_instance_names = {'instance-00000001': '123',
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'instance-00000002': '456',
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'instance-00000003': '789',
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'banana-42-hamster': '444'}
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def test_read_stored_checksum_missing(self):
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self.stubs.Set(os.path, 'exists', lambda x: False)
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csum = imagecache.read_stored_checksum('/tmp/foo')
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self.assertEquals(csum, None)
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def test_read_stored_checksum(self):
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try:
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dirname = tempfile.mkdtemp()
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fname = os.path.join(dirname, 'aaa')
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csum_input = 'fdghkfhkgjjksfdgjksjkghsdf'
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f = open('%s.sha1' % fname, 'w')
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f.write('%s\n' % csum_input)
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f.close()
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csum_output = imagecache.read_stored_checksum(fname)
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self.assertEquals(csum_input, csum_output)
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finally:
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shutil.rmtree(dirname)
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def test_list_base_images(self):
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listing = ['00000001',
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'ephemeral_0_20_None',
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'e97222e91fc4241f49a7f520d1dcf446751129b3_sm',
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'e09c675c2d1cfac32dae3c2d83689c8c94bc693b_sm',
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'e97222e91fc4241f49a7f520d1dcf446751129b3',
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'17d1b00b81642842e514494a78e804e9a511637c',
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'17d1b00b81642842e514494a78e804e9a511637c_5368709120',
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'17d1b00b81642842e514494a78e804e9a511637c_10737418240',
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'00000004']
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self.stubs.Set(os, 'listdir', lambda x: listing)
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self.stubs.Set(os.path, 'isfile', lambda x: True)
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base_dir = '/var/lib/nova/instances/_base'
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image_cache_manager = imagecache.ImageCacheManager()
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image_cache_manager._list_base_images(base_dir)
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self.assertEquals(len(image_cache_manager.unexplained_images), 6)
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expected = os.path.join(base_dir,
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'e97222e91fc4241f49a7f520d1dcf446751129b3')
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self.assertTrue(expected in image_cache_manager.unexplained_images)
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expected = os.path.join(base_dir,
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'17d1b00b81642842e514494a78e804e9a511637c_'
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'10737418240')
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self.assertTrue(expected in image_cache_manager.unexplained_images)
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unexpected = os.path.join(base_dir, '00000004')
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self.assertFalse(unexpected in image_cache_manager.unexplained_images)
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for ent in image_cache_manager.unexplained_images:
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self.assertTrue(ent.startswith(base_dir))
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self.assertEquals(len(image_cache_manager.originals), 2)
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expected = os.path.join(base_dir,
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'17d1b00b81642842e514494a78e804e9a511637c')
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self.assertTrue(expected in image_cache_manager.originals)
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unexpected = os.path.join(base_dir,
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'17d1b00b81642842e514494a78e804e9a511637c_'
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'10737418240')
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self.assertFalse(unexpected in image_cache_manager.originals)
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def test_list_running_instances(self):
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self.stubs.Set(db, 'instance_get_all',
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lambda x: [{'image_ref': 'image-1',
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'host': FLAGS.host,
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'name': 'inst-1',
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'uuid': '123'},
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{'image_ref': 'image-2',
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'host': FLAGS.host,
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'name': 'inst-2',
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'uuid': '456'},
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{'image_ref': 'image-2',
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'host': 'remotehost',
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'name': 'inst-3',
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'uuid': '789'}])
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image_cache_manager = imagecache.ImageCacheManager()
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# The argument here should be a context, but its mocked out
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image_cache_manager._list_running_instances(None)
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self.assertEqual(len(image_cache_manager.used_images), 2)
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self.assertTrue(image_cache_manager.used_images['image-1'] ==
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(1, 0, ['inst-1']))
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self.assertTrue(image_cache_manager.used_images['image-2'] ==
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(1, 1, ['inst-2', 'inst-3']))
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self.assertEqual(len(image_cache_manager.image_popularity), 2)
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self.assertEqual(image_cache_manager.image_popularity['image-1'], 1)
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self.assertEqual(image_cache_manager.image_popularity['image-2'], 2)
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def test_list_backing_images_small(self):
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self.stubs.Set(os, 'listdir',
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lambda x: ['_base', 'instance-00000001',
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'instance-00000002', 'instance-00000003'])
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self.stubs.Set(os.path, 'exists',
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lambda x: x.find('instance-') != -1)
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self.stubs.Set(virtutils, 'get_disk_backing_file',
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lambda x: 'e97222e91fc4241f49a7f520d1dcf446751129b3_sm')
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found = os.path.join(FLAGS.instances_path, '_base',
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'e97222e91fc4241f49a7f520d1dcf446751129b3_sm')
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image_cache_manager = imagecache.ImageCacheManager()
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image_cache_manager.unexplained_images = [found]
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image_cache_manager.instance_names = self.stock_instance_names
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inuse_images = image_cache_manager._list_backing_images()
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self.assertEquals(inuse_images, [found])
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self.assertEquals(len(image_cache_manager.unexplained_images), 0)
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def test_list_backing_images_resized(self):
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self.stubs.Set(os, 'listdir',
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lambda x: ['_base', 'instance-00000001',
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'instance-00000002', 'instance-00000003'])
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self.stubs.Set(os.path, 'exists',
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lambda x: x.find('instance-') != -1)
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self.stubs.Set(virtutils, 'get_disk_backing_file',
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lambda x: ('e97222e91fc4241f49a7f520d1dcf446751129b3_'
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'10737418240'))
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found = os.path.join(FLAGS.instances_path, '_base',
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'e97222e91fc4241f49a7f520d1dcf446751129b3_'
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'10737418240')
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image_cache_manager = imagecache.ImageCacheManager()
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image_cache_manager.unexplained_images = [found]
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image_cache_manager.instance_names = self.stock_instance_names
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inuse_images = image_cache_manager._list_backing_images()
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self.assertEquals(inuse_images, [found])
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self.assertEquals(len(image_cache_manager.unexplained_images), 0)
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def test_list_backing_images_instancename(self):
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self.stubs.Set(os, 'listdir',
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lambda x: ['_base', 'banana-42-hamster'])
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self.stubs.Set(os.path, 'exists',
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lambda x: x.find('banana-42-hamster') != -1)
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self.stubs.Set(virtutils, 'get_disk_backing_file',
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lambda x: 'e97222e91fc4241f49a7f520d1dcf446751129b3_sm')
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found = os.path.join(FLAGS.instances_path, '_base',
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'e97222e91fc4241f49a7f520d1dcf446751129b3_sm')
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image_cache_manager = imagecache.ImageCacheManager()
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image_cache_manager.unexplained_images = [found]
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image_cache_manager.instance_names = self.stock_instance_names
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inuse_images = image_cache_manager._list_backing_images()
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self.assertEquals(inuse_images, [found])
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self.assertEquals(len(image_cache_manager.unexplained_images), 0)
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def test_find_base_file_nothing(self):
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self.stubs.Set(os.path, 'exists', lambda x: False)
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base_dir = '/var/lib/nova/instances/_base'
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fingerprint = '549867354867'
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image_cache_manager = imagecache.ImageCacheManager()
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res = list(image_cache_manager._find_base_file(base_dir, fingerprint))
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self.assertEqual(0, len(res))
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def test_find_base_file_small(self):
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fingerprint = '968dd6cc49e01aaa044ed11c0cce733e0fa44a6a'
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self.stubs.Set(os.path, 'exists',
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lambda x: x.endswith('%s_sm' % fingerprint))
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base_dir = '/var/lib/nova/instances/_base'
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image_cache_manager = imagecache.ImageCacheManager()
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res = list(image_cache_manager._find_base_file(base_dir, fingerprint))
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base_file = os.path.join(base_dir, fingerprint + '_sm')
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self.assertTrue(res == [(base_file, True, False)])
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def test_find_base_file_resized(self):
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fingerprint = '968dd6cc49e01aaa044ed11c0cce733e0fa44a6a'
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listing = ['00000001',
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'ephemeral_0_20_None',
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'968dd6cc49e01aaa044ed11c0cce733e0fa44a6a_10737418240',
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'00000004']
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self.stubs.Set(os, 'listdir', lambda x: listing)
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self.stubs.Set(os.path, 'exists',
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lambda x: x.endswith('%s_10737418240' % fingerprint))
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self.stubs.Set(os.path, 'isfile', lambda x: True)
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base_dir = '/var/lib/nova/instances/_base'
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image_cache_manager = imagecache.ImageCacheManager()
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image_cache_manager._list_base_images(base_dir)
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res = list(image_cache_manager._find_base_file(base_dir, fingerprint))
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base_file = os.path.join(base_dir, fingerprint + '_10737418240')
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self.assertTrue(res == [(base_file, False, True)])
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def test_find_base_file_all(self):
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fingerprint = '968dd6cc49e01aaa044ed11c0cce733e0fa44a6a'
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listing = ['00000001',
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'ephemeral_0_20_None',
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'968dd6cc49e01aaa044ed11c0cce733e0fa44a6a_sm',
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'968dd6cc49e01aaa044ed11c0cce733e0fa44a6a_10737418240',
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'00000004']
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self.stubs.Set(os, 'listdir', lambda x: listing)
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self.stubs.Set(os.path, 'exists', lambda x: True)
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self.stubs.Set(os.path, 'isfile', lambda x: True)
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base_dir = '/var/lib/nova/instances/_base'
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image_cache_manager = imagecache.ImageCacheManager()
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image_cache_manager._list_base_images(base_dir)
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res = list(image_cache_manager._find_base_file(base_dir, fingerprint))
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base_file1 = os.path.join(base_dir, fingerprint)
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base_file2 = os.path.join(base_dir, fingerprint + '_sm')
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base_file3 = os.path.join(base_dir, fingerprint + '_10737418240')
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print res
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self.assertTrue(res == [(base_file1, False, False),
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(base_file2, True, False),
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(base_file3, False, True)])
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def test_verify_checksum(self):
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testdata = ('OpenStack Software delivers a massively scalable cloud '
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'operating system.')
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img = {'container_format': 'ami', 'id': '42'}
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try:
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dirname = tempfile.mkdtemp()
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fname = os.path.join(dirname, 'aaa')
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f = open(fname, 'w')
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f.write(testdata)
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f.close()
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# Checksum is valid
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f = open('%s.sha1' % fname, 'w')
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csum = hashlib.sha1()
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csum.update(testdata)
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f.write(csum.hexdigest())
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f.close()
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image_cache_manager = imagecache.ImageCacheManager()
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res = image_cache_manager._verify_checksum(img, fname)
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self.assertTrue(res)
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# Checksum is invalid
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f = open('%s.sha1' % fname, 'w')
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f.write('banana')
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f.close()
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image_cache_manager = imagecache.ImageCacheManager()
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res = image_cache_manager._verify_checksum(img, fname)
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self.assertFalse(res)
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# Checksum file missing
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os.remove('%s.sha1' % fname)
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image_cache_manager = imagecache.ImageCacheManager()
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res = image_cache_manager._verify_checksum(img, fname)
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self.assertEquals(res, None)
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finally:
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shutil.rmtree(dirname)
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def test_remove_base_file(self):
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try:
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dirname = tempfile.mkdtemp()
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fname = os.path.join(dirname, 'aaa')
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f = open(fname, 'w')
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f.write('data')
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f.close()
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f = open('%s.sha1' % fname, 'w')
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f.close()
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image_cache_manager = imagecache.ImageCacheManager()
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image_cache_manager._remove_base_file(fname)
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# Files are initially too new to delete
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self.assertTrue(os.path.exists(fname))
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self.assertTrue(os.path.exists('%s.sha1' % fname))
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# Old files get cleaned up though
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os.utime(fname, (-1, time.time() - 100000))
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image_cache_manager._remove_base_file(fname)
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self.assertFalse(os.path.exists(fname))
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self.assertFalse(os.path.exists('%s.sha1' % fname))
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finally:
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shutil.rmtree(dirname)
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