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# Copyright 2013 Google Inc. 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.
"""Image manifest."""
import json
from gcimagebundlelib import utils
class ImageManifest(object):
"""Retrieves metadata from the instance and stores it in manifest.json.
The image manifest is a JSON file that is bundled along side the disk.
Included Metadata
- Licenses
"""
def __init__(self, http=utils.Http()):
self._http = http
self._licenses = []
def CreateIfNeeded(self, file_path):
"""Creates the manifest file to the specified path if it's needed.
Args:
file_path: Location of where the manifest should be written to.
Returns:
True Manifest was written to file_path.
False Manifest was not created.
"""
self._LoadLicenses()
if self._IsManifestNeeded():
with open(file_path, 'w') as manifest_file:
self._WriteToFile(manifest_file)
return True
return False
def _LoadLicenses(self):
"""Loads the licenses from the metadata server if they exist."""
response = self._http.GetMetadata('instance/', recursive=True)
instance_metadata = json.loads(response)
if 'licenses' in instance_metadata:
for license_obj in instance_metadata['licenses']:
self._licenses.append(license_obj['id'])
def _ToJson(self):
"""Formats the image metadata as a JSON object."""
return json.dumps(
{
'licenses': self._licenses
})
def _IsManifestNeeded(self):
"""Determines if a manifest should be bundled with the disk."""
if self._licenses:
return len(self._licenses)
return False
def _WriteToFile(self, file_obj):
"""Writes the manifest data to the file handle."""
manifest_json = self._ToJson()
file_obj.write(manifest_json)
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