/usr/lib/python2.7/dist-packages/pylxd/models/image.py is in python-pylxd 2.2.6-0ubuntu1.
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#
# 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.
import collections
import contextlib
import tempfile
import warnings
from requests_toolbelt import MultipartEncoder
from pylxd.models import _model as model
def _image_create_from_config(client, config, wait=False):
""" Create an image from the given configuration.
See: https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-6
"""
response = client.api.images.post(json=config)
if wait:
return client.operations.wait_for_operation(
response.json()['operation'])
return response.json()['operation']
class Image(model.Model):
"""A LXD Image."""
aliases = model.Attribute(readonly=True)
auto_update = model.Attribute(optional=True)
architecture = model.Attribute(readonly=True)
cached = model.Attribute(readonly=True)
created_at = model.Attribute(readonly=True)
expires_at = model.Attribute(readonly=True)
filename = model.Attribute(readonly=True)
fingerprint = model.Attribute(readonly=True)
last_used_at = model.Attribute(readonly=True)
properties = model.Attribute()
public = model.Attribute()
size = model.Attribute(readonly=True)
uploaded_at = model.Attribute(readonly=True)
update_source = model.Attribute(readonly=True)
@property
def api(self):
return self.client.api.images[self.fingerprint]
@classmethod
def exists(cls, client, fingerprint, alias=False):
"""Determine whether an image exists.
If `alias` is True, look up the image by its alias,
rather than its fingerprint.
"""
try:
if alias:
client.images.get_by_alias(fingerprint)
else:
client.images.get(fingerprint)
return True
except cls.NotFound:
return False
@classmethod
def get(cls, client, fingerprint):
"""Get an image."""
response = client.api.images[fingerprint].get()
image = cls(client, **response.json()['metadata'])
return image
@classmethod
def get_by_alias(cls, client, alias):
"""Get an image by its alias."""
response = client.api.images.aliases[alias].get()
fingerprint = response.json()['metadata']['target']
return cls.get(client, fingerprint)
@classmethod
def all(cls, client):
"""Get all images."""
response = client.api.images.get()
images = []
for url in response.json()['metadata']:
fingerprint = url.split('/')[-1]
images.append(cls(client, fingerprint=fingerprint))
return images
@classmethod
def create(
cls, client, image_data, metadata=None, public=False, wait=True):
"""Create an image.
If metadata is provided, a multipart form data request is formed to
push metadata and image together in a single request. The metadata must
be a tar achive.
`wait` parameter is now ignored, as the image fingerprint cannot be
reliably determined consistently until after the image is indexed.
"""
if wait is False: # pragma: no cover
warnings.warn(
'Image.create wait parameter ignored and will be removed in '
'2.3', DeprecationWarning)
headers = {}
if public:
headers['X-LXD-Public'] = '1'
if metadata is not None:
# Image uploaded as chunked/stream (metadata, rootfs)
# multipart message.
# Order of parts is important metadata should be passed first
files = collections.OrderedDict(
metadata=('metadata', metadata, 'application/octet-stream'),
rootfs=('rootfs', image_data, 'application/octet-stream'))
data = MultipartEncoder(files)
headers.update({"Content-Type": data.content_type})
else:
data = image_data
response = client.api.images.post(data=data, headers=headers)
operation = client.operations.wait_for_operation(
response.json()['operation'])
return cls(client, fingerprint=operation.metadata['fingerprint'])
@classmethod
def create_from_simplestreams(cls, client, server, alias,
public=False, auto_update=False):
"""Copy an image from simplestreams."""
config = {
'public': public,
'auto_update': auto_update,
'source': {
'type': 'image',
'mode': 'pull',
'server': server,
'protocol': 'simplestreams',
'fingerprint': alias
}
}
op = _image_create_from_config(client, config, wait=True)
return client.images.get(op.metadata['fingerprint'])
@classmethod
def create_from_url(cls, client, url,
public=False, auto_update=False):
"""Copy an image from an url."""
config = {
'public': public,
'auto_update': auto_update,
'source': {
'type': 'url',
'mode': 'pull',
'url': url
}
}
op = _image_create_from_config(client, config, wait=True)
return client.images.get(op.metadata['fingerprint'])
def export(self):
"""Export the image.
Because the image itself may be quite large, we stream the download
in 1kb chunks, and write it to a temporary file on disk. Once that
file is closed, it is deleted from the disk.
"""
on_disk = tempfile.TemporaryFile()
with contextlib.closing(self.api.export.get(stream=True)) as response:
for chunk in response.iter_content(chunk_size=1024):
on_disk.write(chunk)
on_disk.seek(0)
return on_disk
def add_alias(self, name, description):
"""Add an alias to the image."""
self.client.api.images.aliases.post(json={
'description': description,
'target': self.fingerprint,
'name': name
})
# Update current aliases list
self.aliases.append({
'description': description,
'target': self.fingerprint,
'name': name
})
def delete_alias(self, name):
"""Delete an alias from the image."""
self.client.api.images.aliases[name].delete()
# Update current aliases list
la = [a['name'] for a in self.aliases]
try:
del self.aliases[la.index(name)]
except ValueError:
pass
def copy(self, new_client, public=None, auto_update=None, wait=False):
"""Copy an image to a another LXD.
Destination host information is contained in the client
connection passed in.
"""
self.sync() # Make sure the object isn't stale
url = '/'.join(self.client.api._api_endpoint.split('/')[:-1])
if public is None:
public = self.public
if auto_update is None:
auto_update = self.auto_update
config = {
'filename': self.filename,
'public': public,
'auto_update': auto_update,
'properties': self.properties,
'source': {
'type': 'image',
'mode': 'pull',
'server': url,
'protocol': 'lxd',
'fingerprint': self.fingerprint
}
}
if self.public is not True:
response = self.api.secret.post(json={})
secret = response.json()['metadata']['metadata']['secret']
config['source']['secret'] = secret
cert = self.client.host_info['environment']['certificate']
config['source']['certificate'] = cert
_image_create_from_config(new_client, config, wait)
if wait:
return new_client.images.get(self.fingerprint)
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