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Garbage collection image+storage callback support

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Add support to GC to invoke a callback with the image+storages removed. Only images whose storage was also removed will be sent to the callback. This will be used by security scanning for its own GC in the followup change.
This commit is contained in:
Joseph Schorr 2016-12-22 14:27:42 -05:00
parent 35244d839d
commit 5225642850
4 changed files with 107 additions and 39 deletions
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78
test/test_gc.py
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@ -146,20 +146,43 @@ class TestGarbageCollection(unittest.TestCase):
return len(label_ids - referenced_by_manifest)
@contextmanager
def assert_no_new_dangling_storages_or_labels(self):
def assert_gc_integrity(self, expect_storage_removed=True):
""" Specialized assertion for ensuring that GC cleans up all dangling storages
and labels.
and labels, invokes the callback for images removed and doesn't invoke the
callback for images *not* removed.
"""
# TODO: Consider also asserting the number of DB queries being performed.
# Add a callback for when images are removed.
removed_image_storages = []
model.config.register_image_cleanup_callback(removed_image_storages.extend)
# Store the number of dangling storages and labels.
existing_storage_count = self._get_dangling_storage_count()
existing_label_count = self._get_dangling_label_count()
yield
# Ensure the number of dangling storages and labels has not changed.
updated_storage_count = self._get_dangling_storage_count()
self.assertEqual(updated_storage_count, existing_storage_count)
updated_label_count = self._get_dangling_label_count()
self.assertEqual(updated_label_count, existing_label_count)
# Ensure that for each call to the image+storage cleanup callback, the image and its
# storage is not found *anywhere* in the database.
for removed_image_and_storage in removed_image_storages:
with self.assertRaises(Image.DoesNotExist):
Image.get(id=removed_image_and_storage.id)
with self.assertRaises(ImageStorage.DoesNotExist):
ImageStorage.get(id=removed_image_and_storage.storage_id)
with self.assertRaises(ImageStorage.DoesNotExist):
ImageStorage.get(uuid=removed_image_and_storage.storage.uuid)
self.assertEquals(expect_storage_removed, bool(removed_image_storages))
def test_has_garbage(self):
""" Remove all existing repositories, then add one without garbage, check, then add one with
garbage, and check again.
@ -212,14 +235,14 @@ class TestGarbageCollection(unittest.TestCase):
def test_one_tag(self):
""" Create a repository with a single tag, then remove that tag and verify that the repository
is now empty. """
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity():
repository = self.createRepository(latest=['i1', 'i2', 'i3'])
self.deleteTag(repository, 'latest')
self.assertDeleted(repository, 'i1', 'i2', 'i3')
def test_two_tags_unshared_images(self):
""" Repository has two tags with no shared images between them. """
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity():
repository = self.createRepository(latest=['i1', 'i2', 'i3'], other=['f1', 'f2'])
self.deleteTag(repository, 'latest')
self.assertDeleted(repository, 'i1', 'i2', 'i3')
@ -229,7 +252,7 @@ class TestGarbageCollection(unittest.TestCase):
""" Repository has two tags with shared images. Deleting the tag should only remove the
unshared images.
"""
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity():
repository = self.createRepository(latest=['i1', 'i2', 'i3'], other=['i1', 'f1'])
self.deleteTag(repository, 'latest')
self.assertDeleted(repository, 'i2', 'i3')
@ -239,7 +262,7 @@ class TestGarbageCollection(unittest.TestCase):
""" Two repositories with different images. Removing the tag from one leaves the other's
images intact.
"""
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity():
repository1 = self.createRepository(latest=['i1', 'i2', 'i3'], name='repo1')
repository2 = self.createRepository(latest=['j1', 'j2', 'j3'], name='repo2')
@ -252,7 +275,7 @@ class TestGarbageCollection(unittest.TestCase):
""" Two repositories with shared images. Removing the tag from one leaves the other's
images intact.
"""
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity():
repository1 = self.createRepository(latest=['i1', 'i2', 'i3'], name='repo1')
repository2 = self.createRepository(latest=['i1', 'i2', 'j1'], name='repo2')
@ -265,7 +288,7 @@ class TestGarbageCollection(unittest.TestCase):
""" Two repositories under different namespaces should result in the images being deleted
but not completely removed from the database.
"""
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity():
repository1 = self.createRepository(namespace=ADMIN_ACCESS_USER, latest=['i1', 'i2', 'i3'])
repository2 = self.createRepository(namespace=PUBLIC_USER, latest=['i1', 'i2', 'i3'])
@ -277,7 +300,7 @@ class TestGarbageCollection(unittest.TestCase):
""" Repository has multiple tags with shared images. Selectively deleting the tags, and
verifying at each step.
"""
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity():
repository = self.createRepository(latest=['i1', 'i2', 'i3'], other=['i1', 'f1', 'f2'],
third=['t1', 't2', 't3'], fourth=['i1', 'f1'])
@ -314,7 +337,7 @@ class TestGarbageCollection(unittest.TestCase):
self.assertDeleted(repository, 'i1')
def test_empty_gc(self):
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity(expect_storage_removed=False):
repository = self.createRepository(latest=['i1', 'i2', 'i3'], other=['i1', 'f1', 'f2'],
third=['t1', 't2', 't3'], fourth=['i1', 'f1'])
@ -324,7 +347,7 @@ class TestGarbageCollection(unittest.TestCase):
def test_time_machine_no_gc(self):
""" Repository has two tags with shared images. Deleting the tag should not remove any images
"""
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity(expect_storage_removed=False):
repository = self.createRepository(latest=['i1', 'i2', 'i3'], other=['i1', 'f1'])
self._set_tag_expiration_policy(repository.namespace_user.username, 60*60*24)
@ -336,7 +359,7 @@ class TestGarbageCollection(unittest.TestCase):
""" Repository has two tags with shared images. Deleting the second tag should cause the images
for the first deleted tag to gc.
"""
with self.assert_no_new_dangling_storages_or_labels():
with self.assert_gc_integrity():
repository = self.createRepository(latest=['i1', 'i2', 'i3'], other=['i1', 'f1'])
self._set_tag_expiration_policy(repository.namespace_user.username, 1)
@ -351,6 +374,37 @@ class TestGarbageCollection(unittest.TestCase):
self.assertDeleted(repository, 'i2', 'i3')
self.assertNotDeleted(repository, 'i1', 'f1')
def test_images_shared_storage(self):
""" Repository with two tags, both with the same shared storage. Deleting the first
tag should delete the first image, but *not* its storage.
"""
with self.assert_gc_integrity(expect_storage_removed=False):
repository = self.createRepository()
# Add two tags, each with their own image, but with the same storage.
image_storage = model.storage.create_v1_storage(storage.preferred_locations[0])
first_image = Image.create(docker_image_id='i1',
repository=repository, storage=image_storage,
ancestors='/')
second_image = Image.create(docker_image_id='i2',
repository=repository, storage=image_storage,
ancestors='/')
model.tag.store_tag_manifest(repository.namespace_user.username, repository.name,
'first', first_image.docker_image_id,
'sha:someshahere', '{}')
model.tag.store_tag_manifest(repository.namespace_user.username, repository.name,
'second', second_image.docker_image_id,
'sha:someshahere', '{}')
# Delete the first tag.
self.deleteTag(repository, 'first')
self.assertDeleted(repository, 'i1')
self.assertNotDeleted(repository, 'i2')
if __name__ == '__main__':
unittest.main()