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258 lines
11 KiB
Python
258 lines
11 KiB
Python
# Based on the chroot connection plugin by Maykel Moya
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#
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# Connection plugin for configuring docker containers
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# (c) 2014, Lorin Hochstein
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# (c) 2015, Leendert Brouwer
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# (c) 2015, Toshio Kuratomi <tkuratomi@ansible.com>
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#
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# Maintainer: Leendert Brouwer (https://github.com/objectified)
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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import distutils.spawn
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import os
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import os.path
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import pipes
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import subprocess
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import re
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from distutils.version import LooseVersion
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import ansible.constants as C
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from ansible.errors import AnsibleError, AnsibleFileNotFound
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from ansible.plugins.connection import ConnectionBase, BUFSIZE
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from ansible.utils.unicode import to_bytes
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try:
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from __main__ import display
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except ImportError:
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from ansible.utils.display import Display
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display = Display()
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class Connection(ConnectionBase):
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''' Local docker based connections '''
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transport = 'docker'
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has_pipelining = True
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# su currently has an undiagnosed issue with calculating the file
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# checksums (so copy, for instance, doesn't work right)
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# Have to look into that before re-enabling this
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become_methods = frozenset(C.BECOME_METHODS).difference(('su',))
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def __init__(self, play_context, new_stdin, *args, **kwargs):
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super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
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# Note: docker supports running as non-root in some configurations.
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# (For instance, setting the UNIX socket file to be readable and
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# writable by a specific UNIX group and then putting users into that
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# group). Therefore we don't check that the user is root when using
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# this connection. But if the user is getting a permission denied
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# error it probably means that docker on their system is only
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# configured to be connected to by root and they are not running as
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# root.
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if 'docker_command' in kwargs:
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self.docker_cmd = kwargs['docker_command']
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else:
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self.docker_cmd = distutils.spawn.find_executable('docker')
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if not self.docker_cmd:
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raise AnsibleError("docker command not found in PATH")
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docker_version = self._get_docker_version()
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if LooseVersion(docker_version) < LooseVersion('1.3'):
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raise AnsibleError('docker connection type requires docker 1.3 or higher')
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# The remote user we will request from docker (if supported)
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self.remote_user = None
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# The actual user which will execute commands in docker (if known)
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self.actual_user = None
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if self._play_context.remote_user is not None:
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if LooseVersion(docker_version) >= LooseVersion('1.7'):
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# Support for specifying the exec user was added in docker 1.7
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self.remote_user = self._play_context.remote_user
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self.actual_user = self.remote_user
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else:
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self.actual_user = self._get_docker_remote_user()
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if self.actual_user != self._play_context.remote_user:
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display.warning('docker {0} does not support remote_user, using container default: {1}'
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.format(docker_version, self.actual_user or '?'))
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elif self._display.verbosity > 2:
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# Since we're not setting the actual_user, look it up so we have it for logging later
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# Only do this if display verbosity is high enough that we'll need the value
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# This saves overhead from calling into docker when we don't need to
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self.actual_user = self._get_docker_remote_user()
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@staticmethod
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def _sanitize_version(version):
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return re.sub('[^0-9a-zA-Z\.]', '', version)
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def _get_docker_version(self):
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cmd = [self.docker_cmd]
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if self._play_context.docker_extra_args:
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cmd += self._play_context.docker_extra_args.split(' ')
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cmd += ['version']
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cmd_output = subprocess.check_output(cmd)
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for line in cmd_output.split('\n'):
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if line.startswith('Server version:'): # old docker versions
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return self._sanitize_version(line.split()[2])
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# no result yet, must be newer Docker version
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new_docker_cmd = [
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self.docker_cmd,
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'version', '--format', "'{{.Server.Version}}'"
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]
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cmd_output = subprocess.check_output(new_docker_cmd)
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return self._sanitize_version(cmd_output)
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def _get_docker_remote_user(self):
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""" Get the default user configured in the docker container """
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p = subprocess.Popen([self.docker_cmd, 'inspect', '--format', '{{.Config.User}}', self._play_context.remote_addr],
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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out, err = p.communicate()
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if p.returncode != 0:
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display.warning('unable to retrieve default user from docker container: %s' % out + err)
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return None
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# The default exec user is root, unless it was changed in the Dockerfile with USER
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return out.strip() or 'root'
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def _build_exec_cmd(self, cmd):
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""" Build the local docker exec command to run cmd on remote_host
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If remote_user is available and is supported by the docker
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version we are using, it will be provided to docker exec.
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"""
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local_cmd = [self.docker_cmd]
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if self._play_context.docker_extra_args:
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local_cmd += self._play_context.docker_extra_args.split(' ')
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local_cmd += ['exec']
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if self.remote_user is not None:
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local_cmd += ['-u', self.remote_user]
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# -i is needed to keep stdin open which allows pipelining to work
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local_cmd += ['-i', self._play_context.remote_addr] + cmd
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return local_cmd
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def _connect(self, port=None):
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""" Connect to the container. Nothing to do """
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super(Connection, self)._connect()
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if not self._connected:
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display.vvv(u"ESTABLISH DOCKER CONNECTION FOR USER: {0}".format(
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self.actual_user or '?'), host=self._play_context.remote_addr
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)
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self._connected = True
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def exec_command(self, cmd, in_data=None, sudoable=False):
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""" Run a command on the docker host """
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super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
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local_cmd = self._build_exec_cmd([self._play_context.executable, '-c', cmd])
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display.vvv("EXEC %s" % (local_cmd,), host=self._play_context.remote_addr)
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local_cmd = [to_bytes(i, errors='strict') for i in local_cmd]
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p = subprocess.Popen(local_cmd, shell=False, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = p.communicate(in_data)
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return (p.returncode, stdout, stderr)
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def _prefix_login_path(self, remote_path):
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''' Make sure that we put files into a standard path
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If a path is relative, then we need to choose where to put it.
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ssh chooses $HOME but we aren't guaranteed that a home dir will
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exist in any given chroot. So for now we're choosing "/" instead.
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This also happens to be the former default.
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Can revisit using $HOME instead if it's a problem
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'''
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if not remote_path.startswith(os.path.sep):
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remote_path = os.path.join(os.path.sep, remote_path)
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return os.path.normpath(remote_path)
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def put_file(self, in_path, out_path):
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""" Transfer a file from local to docker container """
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super(Connection, self).put_file(in_path, out_path)
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display.vvv("PUT %s TO %s" % (in_path, out_path), host=self._play_context.remote_addr)
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out_path = self._prefix_login_path(out_path)
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if not os.path.exists(to_bytes(in_path, errors='strict')):
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raise AnsibleFileNotFound(
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"file or module does not exist: %s" % in_path)
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out_path = pipes.quote(out_path)
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# Older docker doesn't have native support for copying files into
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# running containers, so we use docker exec to implement this
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# Although docker version 1.8 and later provide support, the
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# owner and group of the files are always set to root
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args = self._build_exec_cmd([self._play_context.executable, "-c", "dd of=%s bs=%s" % (out_path, BUFSIZE)])
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args = [to_bytes(i, errors='strict') for i in args]
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with open(to_bytes(in_path, errors='strict'), 'rb') as in_file:
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try:
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p = subprocess.Popen(args, stdin=in_file,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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except OSError:
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raise AnsibleError("docker connection requires dd command in the container to put files")
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stdout, stderr = p.communicate()
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if p.returncode != 0:
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raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
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def fetch_file(self, in_path, out_path):
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""" Fetch a file from container to local. """
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super(Connection, self).fetch_file(in_path, out_path)
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display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self._play_context.remote_addr)
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in_path = self._prefix_login_path(in_path)
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# out_path is the final file path, but docker takes a directory, not a
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# file path
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out_dir = os.path.dirname(out_path)
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args = [self.docker_cmd, "cp", "%s:%s" % (self._play_context.remote_addr, in_path), out_dir]
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args = [to_bytes(i, errors='strict') for i in args]
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p = subprocess.Popen(args, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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p.communicate()
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# Rename if needed
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actual_out_path = os.path.join(out_dir, os.path.basename(in_path))
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if actual_out_path != out_path:
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os.rename(to_bytes(actual_out_path, errors='strict'), to_bytes(out_path, errors='strict'))
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def close(self):
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""" Terminate the connection. Nothing to do for Docker"""
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super(Connection, self).close()
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self._connected = False
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