def DetectStorage(self):
"""Detects the storage backend. Only AuFS is currently supported.
More info :
https://docs.docker.com/engine/userguide/storagedriver/
http://jpetazzo.github.io/assets/2015-06-04-deep-dive-into-docker-storage-drivers.html#60
Returns:
Storage: a Storage object.
Raises:
BadStorageException: If the storage backend couldn't be detected.
"""
if not os.path.isdir(self.docker_directory):
error_msg = ('{0:s} is not a Docker directory\n'
'Please specify the Docker\'s directory path.\n'
'hint: python {1:s} -r /var/lib/docker').format(
self.docker_directory, sys.argv[0])
raise BadStorageException(error_msg)
if os.path.isfile(
os.path.join(self.docker_directory, 'repositories-aufs')):
# Handles Docker engine storage versions 1.9 and below.
return aufs.AufsStorage(docker_directory=self.docker_directory,
docker_version=1)
elif os.path.isdir(os.path.join(self.docker_directory, 'aufs')):
return aufs.AufsStorage(docker_directory=self.docker_directory)
elif os.path.isdir(os.path.join(self.docker_directory, 'overlay')):
return overlay.OverlayStorage(
docker_directory=self.docker_directory)
else:
return None
def testPrettyPrintJSON(self):
test_storage_object = aufs.AufsStorage()
test_dict = {'test': [{'dict1': {'key1': 'val1'}, 'dict2': None}]}
test_json = json.dumps(test_dict)
expected_string = (
'{\n "test": [\n {\n "dict1": {\n'
' "key1": "val1"\n }, \n'
' "dict2": null\n }\n ]\n}')
self.assertEqual(expected_string,
test_storage_object._PrettyPrintJSON(test_json))