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# Copyright (c) 2019-2020, Felix Fontein <felix@fontein.de>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = '''
author:
- Felix Fontein (@felixfontein)
name: docker_api
short_description: Run tasks in docker containers
version_added: 1.1.0
description:
- Run commands or put/fetch files to an existing docker container.
- Uses the L(requests library,https://pypi.org/project/requests/) to interact
directly with the Docker daemon instead of using the Docker CLI. Use the
P(community.docker.docker#connection) connection plugin if you want to use the Docker CLI.
notes:
- Does B(not work with TCP TLS sockets)! This is caused by the inability to send C(close_notify) without closing the connection
with Python's C(SSLSocket)s. See U(https://github.com/ansible-collections/community.docker/issues/605) for more information.
extends_documentation_fragment:
- community.docker.docker.api_documentation
- community.docker.docker.var_names
options:
remote_user:
type: str
description:
- The user to execute as inside the container.
vars:
- name: ansible_user
- name: ansible_docker_user
ini:
- section: defaults
key: remote_user
env:
- name: ANSIBLE_REMOTE_USER
cli:
- name: user
keyword:
- name: remote_user
remote_addr:
type: str
description:
- The name of the container you want to access.
default: inventory_hostname
vars:
- name: inventory_hostname
- name: ansible_host
- name: ansible_docker_host
container_timeout:
default: 10
description:
- Controls how long we can wait to access reading output from the container once execution started.
env:
- name: ANSIBLE_TIMEOUT
- name: ANSIBLE_DOCKER_TIMEOUT
version_added: 2.2.0
ini:
- key: timeout
section: defaults
- key: timeout
section: docker_connection
version_added: 2.2.0
vars:
- name: ansible_docker_timeout
version_added: 2.2.0
cli:
- name: timeout
type: integer
'''
import os
import os.path
from ansible.errors import AnsibleFileNotFound, AnsibleConnectionFailure
from ansible.module_utils.common.text.converters import to_bytes, to_native, to_text
from ansible.plugins.connection import ConnectionBase
from ansible.utils.display import Display
from ansible_collections.community.docker.plugins.module_utils.common_api import (
RequestException,
)
from ansible_collections.community.docker.plugins.module_utils.copy import (
DockerFileCopyError,
DockerFileNotFound,
fetch_file,
put_file,
)
from ansible_collections.community.docker.plugins.plugin_utils.socket_handler import (
DockerSocketHandler,
)
from ansible_collections.community.docker.plugins.plugin_utils.common_api import (
AnsibleDockerClient,
)
from ansible_collections.community.docker.plugins.module_utils._api.errors import APIError, DockerException, NotFound
MIN_DOCKER_API = None
display = Display()
class Connection(ConnectionBase):
''' Local docker based connections '''
transport = 'community.docker.docker_api'
has_pipelining = True
def _call_client(self, callable, not_found_can_be_resource=False):
try:
return callable()
except NotFound as e:
if not_found_can_be_resource:
raise AnsibleConnectionFailure('Could not find container "{1}" or resource in it ({0})'.format(e, self.get_option('remote_addr')))
else:
raise AnsibleConnectionFailure('Could not find container "{1}" ({0})'.format(e, self.get_option('remote_addr')))
except APIError as e:
if e.response is not None and e.response.status_code == 409:
raise AnsibleConnectionFailure('The container "{1}" has been paused ({0})'.format(e, self.get_option('remote_addr')))
self.client.fail(
'An unexpected Docker error occurred for container "{1}": {0}'.format(e, self.get_option('remote_addr'))
)
except DockerException as e:
self.client.fail(
'An unexpected Docker error occurred for container "{1}": {0}'.format(e, self.get_option('remote_addr'))
)
except RequestException as e:
self.client.fail(
'An unexpected requests error occurred for container "{1}" when trying to talk to the Docker daemon: {0}'
.format(e, self.get_option('remote_addr'))
)
def __init__(self, play_context, new_stdin, *args, **kwargs):
super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
self.client = None
self.ids = dict()
# Windows uses Powershell modules
if getattr(self._shell, "_IS_WINDOWS", False):
self.module_implementation_preferences = ('.ps1', '.exe', '')
self.actual_user = None
def _connect(self, port=None):
""" Connect to the container. Nothing to do """
super(Connection, self)._connect()
if not self._connected:
self.actual_user = self.get_option('remote_user')
display.vvv(u"ESTABLISH DOCKER CONNECTION FOR USER: {0}".format(
self.actual_user or u'?'), host=self.get_option('remote_addr')
)
if self.client is None:
self.client = AnsibleDockerClient(self, min_docker_api_version=MIN_DOCKER_API)
self._connected = True
if self.actual_user is None and display.verbosity > 2:
# Since we're not setting the actual_user, look it up so we have it for logging later
# Only do this if display verbosity is high enough that we'll need the value
# This saves overhead from calling into docker when we don't need to
display.vvv(u"Trying to determine actual user")
result = self._call_client(lambda: self.client.get_json('/containers/{0}/json', self.get_option('remote_addr')))
if result.get('Config'):
self.actual_user = result['Config'].get('User')
if self.actual_user is not None:
display.vvv(u"Actual user is '{0}'".format(self.actual_user))
def exec_command(self, cmd, in_data=None, sudoable=False):
""" Run a command on the docker host """
super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
command = [self._play_context.executable, '-c', to_text(cmd)]
do_become = self.become and self.become.expect_prompt() and sudoable
display.vvv(
u"EXEC {0}{1}{2}".format(
to_text(command),
', with stdin ({0} bytes)'.format(len(in_data)) if in_data is not None else '',
', with become prompt' if do_become else '',
),
host=self.get_option('remote_addr')
)
need_stdin = True if (in_data is not None) or do_become else False
data = {
'Container': self.get_option('remote_addr'),
'User': self.get_option('remote_user') or '',
'Privileged': False,
'Tty': False,
'AttachStdin': need_stdin,
'AttachStdout': True,
'AttachStderr': True,
'Cmd': command,
}
if 'detachKeys' in self.client._general_configs:
data['detachKeys'] = self.client._general_configs['detachKeys']
exec_data = self._call_client(lambda: self.client.post_json_to_json('/containers/{0}/exec', self.get_option('remote_addr'), data=data))
exec_id = exec_data['Id']
data = {
'Tty': False,
'Detach': False
}
if need_stdin:
exec_socket = self._call_client(lambda: self.client.post_json_to_stream_socket('/exec/{0}/start', exec_id, data=data))
try:
with DockerSocketHandler(display, exec_socket, container=self.get_option('remote_addr')) as exec_socket_handler:
if do_become:
become_output = [b'']
def append_become_output(stream_id, data):
become_output[0] += data
exec_socket_handler.set_block_done_callback(append_become_output)
while not self.become.check_success(become_output[0]) and not self.become.check_password_prompt(become_output[0]):
if not exec_socket_handler.select(self.get_option('container_timeout')):
stdout, stderr = exec_socket_handler.consume()
raise AnsibleConnectionFailure('timeout waiting for privilege escalation password prompt:\n' + to_native(become_output[0]))
if exec_socket_handler.is_eof():
raise AnsibleConnectionFailure('privilege output closed while waiting for password prompt:\n' + to_native(become_output[0]))
if not self.become.check_success(become_output[0]):
become_pass = self.become.get_option('become_pass', playcontext=self._play_context)
exec_socket_handler.write(to_bytes(become_pass, errors='surrogate_or_strict') + b'\n')
if in_data is not None:
exec_socket_handler.write(in_data)
stdout, stderr = exec_socket_handler.consume()
finally:
exec_socket.close()
else:
stdout, stderr = self._call_client(lambda: self.client.post_json_to_stream(
'/exec/{0}/start', exec_id, stream=False, demux=True, tty=False, data=data))
result = self._call_client(lambda: self.client.get_json('/exec/{0}/json', exec_id))
return result.get('ExitCode') or 0, stdout or b'', stderr or b''
def _prefix_login_path(self, remote_path):
''' Make sure that we put files into a standard path
If a path is relative, then we need to choose where to put it.
ssh chooses $HOME but we aren't guaranteed that a home dir will
exist in any given chroot. So for now we're choosing "/" instead.
This also happens to be the former default.
Can revisit using $HOME instead if it's a problem
'''
if getattr(self._shell, "_IS_WINDOWS", False):
import ntpath
return ntpath.normpath(remote_path)
else:
if not remote_path.startswith(os.path.sep):
remote_path = os.path.join(os.path.sep, remote_path)
return os.path.normpath(remote_path)
def put_file(self, in_path, out_path):
""" Transfer a file from local to docker container """
super(Connection, self).put_file(in_path, out_path)
display.vvv("PUT %s TO %s" % (in_path, out_path), host=self.get_option('remote_addr'))
out_path = self._prefix_login_path(out_path)
if self.actual_user not in self.ids:
dummy, ids, dummy = self.exec_command(b'id -u && id -g')
try:
user_id, group_id = ids.splitlines()
self.ids[self.actual_user] = int(user_id), int(group_id)
display.vvvv(
'PUT: Determined uid={0} and gid={1} for user "{2}"'.format(user_id, group_id, self.actual_user),
host=self.get_option('remote_addr')
)
except Exception as e:
raise AnsibleConnectionFailure(
'Error while determining user and group ID of current user in container "{1}": {0}\nGot value: {2!r}'
.format(e, self.get_option('remote_addr'), ids)
)
user_id, group_id = self.ids[self.actual_user]
try:
self._call_client(
lambda: put_file(
self.client,
container=self.get_option('remote_addr'),
in_path=in_path,
out_path=out_path,
user_id=user_id,
group_id=group_id,
user_name=self.actual_user,
follow_links=True,
),
not_found_can_be_resource=True,
)
except DockerFileNotFound as exc:
raise AnsibleFileNotFound(to_native(exc))
except DockerFileCopyError as exc:
raise AnsibleConnectionFailure(to_native(exc))
def fetch_file(self, in_path, out_path):
""" Fetch a file from container to local. """
super(Connection, self).fetch_file(in_path, out_path)
display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self.get_option('remote_addr'))
in_path = self._prefix_login_path(in_path)
try:
self._call_client(
lambda: fetch_file(
self.client,
container=self.get_option('remote_addr'),
in_path=in_path,
out_path=out_path,
follow_links=True,
log=lambda msg: display.vvvv(msg, host=self.get_option('remote_addr')),
),
not_found_can_be_resource=True,
)
except DockerFileNotFound as exc:
raise AnsibleFileNotFound(to_native(exc))
except DockerFileCopyError as exc:
raise AnsibleConnectionFailure(to_native(exc))
def close(self):
""" Terminate the connection. Nothing to do for Docker"""
super(Connection, self).close()
self._connected = False
def reset(self):
self.ids.clear()
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