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docker-py/docker/api/image.py

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import logging
import os
import six
from .. import auth, errors, utils
from ..constants import DEFAULT_DATA_CHUNK_SIZE
log = logging.getLogger(__name__)
class ImageApiMixin(object):
@utils.check_resource('image')
def get_image(self, image, chunk_size=DEFAULT_DATA_CHUNK_SIZE):
"""
Get a tarball of an image. Similar to the ``docker save`` command.
Args:
image (str): Image name to get
chunk_size (int): The number of bytes returned by each iteration
of the generator. If ``None``, data will be streamed as it is
received. Default: 2 MB
Returns:
(generator): A stream of raw archive data.
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
Example:
>>> image = cli.get_image("busybox:latest")
>>> f = open('/tmp/busybox-latest.tar', 'wb')
>>> for chunk in image:
>>> f.write(chunk)
>>> f.close()
"""
res = self._get(self._url("/images/{0}/get", image), stream=True)
return self._stream_raw_result(res, chunk_size, False)
@utils.check_resource('image')
def history(self, image):
"""
Show the history of an image.
Args:
image (str): The image to show history for
Returns:
(str): The history of the image
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
"""
res = self._get(self._url("/images/{0}/history", image))
return self._result(res, True)
def images(self, name=None, quiet=False, all=False, filters=None):
"""
List images. Similar to the ``docker images`` command.
Args:
name (str): Only show images belonging to the repository ``name``
quiet (bool): Only return numeric IDs as a list.
all (bool): Show intermediate image layers. By default, these are
filtered out.
filters (dict): Filters to be processed on the image list.
Available filters:
- ``dangling`` (bool)
- ``label`` (str): format either ``key`` or ``key=value``
Returns:
(dict or list): A list if ``quiet=True``, otherwise a dict.
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
"""
params = {
'filter': name,
'only_ids': 1 if quiet else 0,
'all': 1 if all else 0,
}
if filters:
params['filters'] = utils.convert_filters(filters)
res = self._result(self._get(self._url("/images/json"), params=params),
True)
if quiet:
return [x['Id'] for x in res]
return res
def import_image(self, src=None, repository=None, tag=None, image=None,
changes=None, stream_src=False):
"""
Import an image. Similar to the ``docker import`` command.
If ``src`` is a string or unicode string, it will first be treated as a
path to a tarball on the local system. If there is an error reading
from that file, ``src`` will be treated as a URL instead to fetch the
image from. You can also pass an open file handle as ``src``, in which
case the data will be read from that file.
If ``src`` is unset but ``image`` is set, the ``image`` parameter will
be taken as the name of an existing image to import from.
Args:
src (str or file): Path to tarfile, URL, or file-like object
repository (str): The repository to create
tag (str): The tag to apply
image (str): Use another image like the ``FROM`` Dockerfile
parameter
"""
if not (src or image):
raise errors.DockerException(
'Must specify src or image to import from'
)
u = self._url('/images/create')
params = _import_image_params(
repository, tag, image,
src=(src if isinstance(src, six.string_types) else None),
changes=changes
)
headers = {'Content-Type': 'application/tar'}
if image or params.get('fromSrc') != '-': # from image or URL
return self._result(
self._post(u, data=None, params=params)
)
elif isinstance(src, six.string_types): # from file path
with open(src, 'rb') as f:
return self._result(
self._post(
u, data=f, params=params, headers=headers, timeout=None
)
)
else: # from raw data
if stream_src:
headers['Transfer-Encoding'] = 'chunked'
return self._result(
self._post(u, data=src, params=params, headers=headers)
)
def import_image_from_data(self, data, repository=None, tag=None,
changes=None):
"""
Like :py:meth:`~docker.api.image.ImageApiMixin.import_image`, but
allows importing in-memory bytes data.
Args:
data (bytes collection): Bytes collection containing valid tar data
repository (str): The repository to create
tag (str): The tag to apply
"""
u = self._url('/images/create')
params = _import_image_params(
repository, tag, src='-', changes=changes
)
headers = {'Content-Type': 'application/tar'}
return self._result(
self._post(
u, data=data, params=params, headers=headers, timeout=None
)
)
def import_image_from_file(self, filename, repository=None, tag=None,
changes=None):
"""
Like :py:meth:`~docker.api.image.ImageApiMixin.import_image`, but only
supports importing from a tar file on disk.
Args:
filename (str): Full path to a tar file.
repository (str): The repository to create
tag (str): The tag to apply
Raises:
IOError: File does not exist.
"""
return self.import_image(
src=filename, repository=repository, tag=tag, changes=changes
)
def import_image_from_stream(self, stream, repository=None, tag=None,
changes=None):
return self.import_image(
src=stream, stream_src=True, repository=repository, tag=tag,
changes=changes
)
def import_image_from_url(self, url, repository=None, tag=None,
changes=None):
"""
Like :py:meth:`~docker.api.image.ImageApiMixin.import_image`, but only
supports importing from a URL.
Args:
url (str): A URL pointing to a tar file.
repository (str): The repository to create
tag (str): The tag to apply
"""
return self.import_image(
src=url, repository=repository, tag=tag, changes=changes
)
def import_image_from_image(self, image, repository=None, tag=None,
changes=None):
"""
Like :py:meth:`~docker.api.image.ImageApiMixin.import_image`, but only
supports importing from another image, like the ``FROM`` Dockerfile
parameter.
Args:
image (str): Image name to import from
repository (str): The repository to create
tag (str): The tag to apply
"""
return self.import_image(
image=image, repository=repository, tag=tag, changes=changes
)
@utils.check_resource('image')
def inspect_image(self, image):
"""
Get detailed information about an image. Similar to the ``docker
inspect`` command, but only for images.
Args:
image (str): The image to inspect
Returns:
(dict): Similar to the output of ``docker inspect``, but as a
single dict
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
"""
return self._result(
self._get(self._url("/images/{0}/json", image)), True
)
@utils.minimum_version('1.30')
@utils.check_resource('image')
def inspect_distribution(self, image):
"""
Get image digest and platform information by contacting the registry.
Args:
image (str): The image name to inspect
Returns:
(dict): A dict containing distribution data
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
"""
return self._result(
self._get(self._url("/distribution/{0}/json", image)), True
)
def load_image(self, data, quiet=None):
"""
Load an image that was previously saved using
:py:meth:`~docker.api.image.ImageApiMixin.get_image` (or ``docker
save``). Similar to ``docker load``.
Args:
data (binary): Image data to be loaded.
quiet (boolean): Suppress progress details in response.
Returns:
(generator): Progress output as JSON objects. Only available for
API version >= 1.23
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
"""
params = {}
if quiet is not None:
if utils.version_lt(self._version, '1.23'):
raise errors.InvalidVersion(
'quiet is not supported in API version < 1.23'
)
params['quiet'] = quiet
res = self._post(
self._url("/images/load"), data=data, params=params, stream=True
)
if utils.version_gte(self._version, '1.23'):
return self._stream_helper(res, decode=True)
self._raise_for_status(res)
@utils.minimum_version('1.25')
def prune_images(self, filters=None):
"""
Delete unused images
Args:
filters (dict): Filters to process on the prune list.
Available filters:
- dangling (bool): When set to true (or 1), prune only
unused and untagged images.
Returns:
(dict): A dict containing a list of deleted image IDs and
the amount of disk space reclaimed in bytes.
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
"""
url = self._url("/images/prune")
params = {}
if filters is not None:
params['filters'] = utils.convert_filters(filters)
return self._result(self._post(url, params=params), True)
def pull(self, repository, tag=None, stream=False, auth_config=None,
decode=False, platform=None):
"""
Pulls an image. Similar to the ``docker pull`` command.
Args:
repository (str): The repository to pull
tag (str): The tag to pull
stream (bool): Stream the output as a generator. Make sure to
consume the generator, otherwise pull might get cancelled.
auth_config (dict): Override the credentials that
:py:meth:`~docker.api.daemon.DaemonApiMixin.login` has set for
this request. ``auth_config`` should contain the ``username``
and ``password`` keys to be valid.
decode (bool): Decode the JSON data from the server into dicts.
Only applies with ``stream=True``
platform (str): Platform in the format ``os[/arch[/variant]]``
Returns:
(generator or str): The output
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
Example:
>>> for line in cli.pull('busybox', stream=True, decode=True):
... print(json.dumps(line, indent=4))
{
"status": "Pulling image (latest) from busybox",
"progressDetail": {},
"id": "e72ac664f4f0"
}
{
"status": "Pulling image (latest) from busybox, endpoint: ...",
"progressDetail": {},
"id": "e72ac664f4f0"
}
"""
if not tag:
repository, tag = utils.parse_repository_tag(repository)
registry, repo_name = auth.resolve_repository_name(repository)
params = {
'tag': tag,
'fromImage': repository
}
headers = {}
if auth_config is None:
header = auth.get_config_header(self, registry)
if header:
headers['X-Registry-Auth'] = header
else:
log.debug('Sending supplied auth config')
headers['X-Registry-Auth'] = auth.encode_header(auth_config)
if platform is not None:
if utils.version_lt(self._version, '1.32'):
raise errors.InvalidVersion(
'platform was only introduced in API version 1.32'
)
params['platform'] = platform
response = self._post(
self._url('/images/create'), params=params, headers=headers,
stream=stream, timeout=None
)
self._raise_for_status(response)
if stream:
return self._stream_helper(response, decode=decode)
return self._result(response)
def push(self, repository, tag=None, stream=False, auth_config=None,
decode=False):
"""
Push an image or a repository to the registry. Similar to the ``docker
push`` command.
Args:
repository (str): The repository to push to
tag (str): An optional tag to push
stream (bool): Stream the output as a blocking generator
auth_config (dict): Override the credentials that
:py:meth:`~docker.api.daemon.DaemonApiMixin.login` has set for
this request. ``auth_config`` should contain the ``username``
and ``password`` keys to be valid.
decode (bool): Decode the JSON data from the server into dicts.
Only applies with ``stream=True``
Returns:
(generator or str): The output from the server.
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
Example:
>>> for line in cli.push('yourname/app', stream=True, decode=True):
... print(line)
{'status': 'Pushing repository yourname/app (1 tags)'}
{'status': 'Pushing','progressDetail': {}, 'id': '511136ea3c5a'}
{'status': 'Image already pushed, skipping', 'progressDetail':{},
'id': '511136ea3c5a'}
...
"""
if not tag:
repository, tag = utils.parse_repository_tag(repository)
registry, repo_name = auth.resolve_repository_name(repository)
u = self._url("/images/{0}/push", repository)
params = {
'tag': tag
}
headers = {}
if auth_config is None:
header = auth.get_config_header(self, registry)
if header:
headers['X-Registry-Auth'] = header
else:
log.debug('Sending supplied auth config')
headers['X-Registry-Auth'] = auth.encode_header(auth_config)
response = self._post_json(
u, None, headers=headers, stream=stream, params=params
)
self._raise_for_status(response)
if stream:
return self._stream_helper(response, decode=decode)
return self._result(response)
@utils.check_resource('image')
def remove_image(self, image, force=False, noprune=False):
"""
Remove an image. Similar to the ``docker rmi`` command.
Args:
image (str): The image to remove
force (bool): Force removal of the image
noprune (bool): Do not delete untagged parents
"""
params = {'force': force, 'noprune': noprune}
res = self._delete(self._url("/images/{0}", image), params=params)
return self._result(res, True)
def search(self, term):
"""
Search for images on Docker Hub. Similar to the ``docker search``
command.
Args:
term (str): A term to search for.
Returns:
(list of dicts): The response of the search.
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
"""
return self._result(
self._get(self._url("/images/search"), params={'term': term}),
True
)
@utils.check_resource('image')
def tag(self, image, repository, tag=None, force=False):
"""
Tag an image into a repository. Similar to the ``docker tag`` command.
Args:
image (str): The image to tag
repository (str): The repository to set for the tag
tag (str): The tag name
force (bool): Force
Returns:
(bool): ``True`` if successful
Raises:
:py:class:`docker.errors.APIError`
If the server returns an error.
Example:
>>> client.tag('ubuntu', 'localhost:5000/ubuntu', 'latest',
force=True)
"""
params = {
'tag': tag,
'repo': repository,
'force': 1 if force else 0
}
url = self._url("/images/{0}/tag", image)
res = self._post(url, params=params)
self._raise_for_status(res)
return res.status_code == 201
def is_file(src):
try:
return (
isinstance(src, six.string_types) and
os.path.isfile(src)
)
except TypeError: # a data string will make isfile() raise a TypeError
return False
def _import_image_params(repo, tag, image=None, src=None,
changes=None):
params = {
'repo': repo,
'tag': tag,
}
if image:
params['fromImage'] = image
elif src and not is_file(src):
params['fromSrc'] = src
else:
params['fromSrc'] = '-'
if changes:
params['changes'] = changes
return params
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