/
driver.py
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/
driver.py
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# Copyright 2016 Intel.
#
# 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.
from docker import errors
from oslo_log import log as logging
from oslo_utils import excutils
from zun.common.docker_image import reference as docker_image
from zun.common import exception
from zun.common.i18n import _
from zun.common import utils
import zun.conf
from zun.container.docker import utils as docker_utils
from zun.image import driver
CONF = zun.conf.CONF
LOG = logging.getLogger(__name__)
class DockerDriver(driver.ContainerImageDriver):
def __init__(self):
super(DockerDriver, self).__init__()
def delete_image(self, context, img_id):
LOG.debug('Delete an image %s in docker', img_id)
with docker_utils.docker_client() as docker:
try:
docker.remove_image(img_id)
except errors.ImageNotFound:
return
except errors.APIError as api_error:
raise exception.ZunException(str(api_error))
except Exception as e:
LOG.exception('Unknown exception occurred while deleting '
'image %s in glance:%s',
img_id,
str(e))
raise exception.ZunException(str(e))
def _search_image_on_host(self, repo, tag):
with docker_utils.docker_client() as docker:
image = repo + ":" + tag
LOG.debug('Inspecting image locally %s', image)
try:
image_dict = docker.inspect_image(image)
if image_dict:
return {'image': repo, 'path': None}
except errors.NotFound:
LOG.debug('Image %s not found locally', image)
return None
def _pull_image(self, repo, tag, registry):
auth_config = None
image_ref = docker_image.Reference.parse(repo)
registry_domain, remainder = image_ref.split_hostname()
if registry and registry.username:
auth_config = {'username': registry.username,
'password': registry.password}
elif (registry_domain and
registry_domain == CONF.docker.default_registry and
CONF.docker.default_registry_username):
auth_config = {'username': CONF.docker.default_registry_username,
'password': CONF.docker.default_registry_password}
with docker_utils.docker_client() as docker:
try:
docker.pull(repo, tag=tag, auth_config=auth_config)
except errors.NotFound as e:
raise exception.ImageNotFound(message=str(e))
except errors.APIError:
LOG.exception('Error on pulling image')
message = _('Error on pulling image: %(repo)s:%(tag)s') % {
'repo': repo, 'tag': tag}
raise exception.ZunException(message)
def pull_image(self, context, repo, tag, image_pull_policy, registry):
image_loaded = True
image = self._search_image_on_host(repo, tag)
if not utils.should_pull_image(image_pull_policy, bool(image)):
if image:
LOG.debug('Image %s present locally', repo)
return image, image_loaded
else:
message = _('Image %s not present with pull policy of Never'
) % repo
raise exception.ImageNotFound(message)
try:
LOG.debug('Pulling image from docker %(repo)s,'
' context %(context)s',
{'repo': repo, 'context': context})
self._pull_image(repo, tag, registry)
return {'image': repo, 'path': None}, image_loaded
except exception.ImageNotFound:
with excutils.save_and_reraise_exception():
LOG.error('Image %s was not found in docker repo', repo)
except exception.DockerError:
with excutils.save_and_reraise_exception():
LOG.error('Docker API error occurred during downloading '
'image %s', repo)
except Exception as e:
msg = _('Cannot download image from docker: {0}')
raise exception.ZunException(msg.format(e))
def search_image(self, context, repo, tag, exact_match):
image_ref = docker_image.Reference.parse(repo)
registry, image_name = image_ref.split_hostname()
if registry and registry != 'docker.io':
# Images searching is only supported in DockerHub
msg = _('Image searching is not supported in registry: {0}')
raise exception.OperationNotSupported(msg.format(registry))
with docker_utils.docker_client() as docker:
try:
# TODO(hongbin): search image by both name and tag
images = docker.search(image_name)
except errors.APIError as api_error:
raise exception.ZunException(str(api_error))
except Exception as e:
msg = _('Cannot search image in docker: {0}')
raise exception.ZunException(msg.format(e))
if exact_match:
images = [i for i in images if i['name'] == image_name]
for image in images:
image['metadata'] = {}
for key in ('is_official', 'star_count'):
value = image.pop(key, None)
if value is not None:
image['metadata'][key] = value
# TODO(hongbin): convert images to a list of Zun Image object
return images