# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Copyright (c) 2010 Citrix Systems, Inc.
#
#    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.

"""
Handling of VM disk images.
"""

from nova import context
from nova import flags
from nova.image import glance as glance_image_service
import nova.image
from nova import log as logging
from nova import utils


FLAGS = flags.FLAGS
LOG = logging.getLogger('nova.virt.images')


def fetch(image_href, path, _user_id, _project_id):
    # TODO(vish): Improve context handling and add owner and auth data
    #             when it is added to glance.  Right now there is no
    #             auth checking in glance, so we assume that access was
    #             checked before we got here.
    (image_service, image_id) = nova.image.get_image_service(image_href)
    with open(path, "wb") as image_file:
        elevated = context.get_admin_context()
        metadata = image_service.get(elevated, image_id, image_file)
    return metadata
