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768 lines
25 KiB
Python
768 lines
25 KiB
Python
# Copyright 2019, David Wilson
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors
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# may be used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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from __future__ import absolute_import
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from __future__ import unicode_literals
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"""
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Mitogen extends Ansible's target configuration mechanism in several ways that
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require some care:
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* Per-task configurables in Ansible like ansible_python_interpreter are
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connection-layer configurables in Mitogen. They must be extracted during each
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task execution to form the complete connection-layer configuration.
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* Mitogen has extra configurables not supported by Ansible at all, such as
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mitogen_ssh_debug_level. These are extracted the same way as
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ansible_python_interpreter.
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* Mitogen allows connections to be delegated to other machines. Ansible has no
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internal framework for this, and so Mitogen must figure out a delegated
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connection configuration all on its own. It cannot reuse much of the Ansible
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machinery for building a connection configuration, as that machinery is
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deeply spread out and hard-wired to expect Ansible's usual mode of operation.
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For normal and delegate_to connections, Ansible's PlayContext is reused where
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possible to maximize compatibility, but for proxy hops, configurations are
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built up using the HostVars magic class to call VariableManager.get_vars()
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behind the scenes on our behalf. Where Ansible has multiple sources of a
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configuration item, for example, ansible_ssh_extra_args, Mitogen must (ideally
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perfectly) reproduce how Ansible arrives at its value, without using mechanisms
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that are hard-wired or change across Ansible versions.
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That is what this file is for. It exports two spec classes, one that takes all
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information from PlayContext, and another that takes (almost) all information
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from HostVars.
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"""
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import abc
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import os
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import ansible.utils.shlex
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import ansible.constants as C
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from ansible.module_utils.six import with_metaclass
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from ansible.utils.unsafe_proxy import AnsibleUnsafeText
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# this was added in Ansible >= 2.8.0; fallback to the default interpreter if necessary
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try:
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from ansible.executor.interpreter_discovery import discover_interpreter
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except ImportError:
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discover_interpreter = lambda a,b,c,d: '/usr/bin/python'
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import mitogen.core
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def run_interpreter_discovery_if_necessary(s, task_vars, action):
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"""
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Triggers ansible python interpreter discovery if requested.
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Caches this value the same way Ansible does it.
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"""
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# _finding_python_interpreter is a special case where we've already called discover_interpreter which then
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# calls low_level_exec_command which then retriggers spec.python_path()
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# in connect_ssh(), so we'll return the default '/usr/bin/python' to finish building the stack
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# TODO: possible issues here? Chicken-and-egg issue, in order to `connect_ssh` we need a python path
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if action._finding_python_interpreter or s is None:
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return '/usr/bin/python'
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if s in ['auto', 'auto_legacy', 'auto_silent', 'auto_legacy_silent']:
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# python is the only supported interpreter_name as of Ansible 2.8.6
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interpreter_name = 'python'
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discovered_interpreter_config = u'discovered_interpreter_%s' % interpreter_name
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if task_vars.get('ansible_facts') is None:
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task_vars['ansible_facts'] = {}
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if discovered_interpreter_config not in task_vars['ansible_facts']:
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action._finding_python_interpreter = True
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# fake pipelining so discover_interpreter can be happy
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action._connection.has_pipelining = True
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s = AnsibleUnsafeText(discover_interpreter(
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action=action,
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interpreter_name=interpreter_name,
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discovery_mode=s,
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task_vars=task_vars))
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# cache discovered interpreter
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task_vars['ansible_facts'][discovered_interpreter_config] = s
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action._connection.has_pipelining = False
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else:
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s = task_vars['ansible_facts'][discovered_interpreter_config]
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# propagate discovered interpreter as fact
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action._discovered_interpreter_key = discovered_interpreter_config
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action._discovered_interpreter = s
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action._finding_python_interpreter = False
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return s
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def parse_python_path(s, task_vars, action):
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"""
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Given the string set for ansible_python_interpeter, parse it using shell
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syntax and return an appropriate argument vector. If the value detected is
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one of interpreter discovery then run that first. Caches python interpreter
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discovery value in `facts_from_task_vars` like how Ansible handles this.
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"""
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if s:
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s = run_interpreter_discovery_if_necessary(s, task_vars, action)
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return ansible.utils.shlex.shlex_split(s)
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def optional_secret(value):
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"""
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Wrap `value` in :class:`mitogen.core.Secret` if it is not :data:`None`,
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otherwise return :data:`None`.
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"""
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if value is not None:
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return mitogen.core.Secret(value)
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def first_true(it, default=None):
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"""
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Return the first truthy element from `it`.
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"""
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for elem in it:
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if elem:
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return elem
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return default
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class Spec(with_metaclass(abc.ABCMeta, object)):
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"""
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A source for variables that comprise a connection configuration.
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"""
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@abc.abstractmethod
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def transport(self):
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"""
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The name of the Ansible plug-in implementing the connection.
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"""
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@abc.abstractmethod
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def inventory_name(self):
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"""
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The name of the target being connected to as it appears in Ansible's
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inventory.
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"""
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@abc.abstractmethod
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def remote_addr(self):
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"""
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The network address of the target, or for container and other special
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targets, some other unique identifier.
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"""
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@abc.abstractmethod
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def remote_user(self):
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"""
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The username of the login account on the target.
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"""
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@abc.abstractmethod
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def password(self):
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"""
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The password of the login account on the target.
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"""
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@abc.abstractmethod
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def become(self):
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"""
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:data:`True` if privilege escalation should be active.
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"""
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@abc.abstractmethod
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def become_method(self):
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"""
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The name of the Ansible become method to use.
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"""
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@abc.abstractmethod
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def become_user(self):
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"""
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The username of the target account for become.
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"""
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@abc.abstractmethod
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def become_pass(self):
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"""
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The password of the target account for become.
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"""
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@abc.abstractmethod
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def port(self):
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"""
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The port of the login service on the target machine.
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"""
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@abc.abstractmethod
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def python_path(self):
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"""
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Path to the Python interpreter on the target machine.
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"""
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@abc.abstractmethod
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def private_key_file(self):
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"""
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Path to the SSH private key file to use to login.
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"""
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@abc.abstractmethod
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def ssh_executable(self):
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"""
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Path to the SSH executable.
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"""
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@abc.abstractmethod
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def timeout(self):
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"""
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The generic timeout for all connections.
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"""
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@abc.abstractmethod
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def ansible_ssh_timeout(self):
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"""
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The SSH-specific timeout for a connection.
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"""
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@abc.abstractmethod
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def ssh_args(self):
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"""
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The list of additional arguments that should be included in an SSH
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invocation.
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"""
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@abc.abstractmethod
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def become_exe(self):
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"""
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The path to the executable implementing the become method on the remote
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machine.
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"""
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@abc.abstractmethod
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def sudo_args(self):
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"""
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The list of additional arguments that should be included in a become
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invocation.
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"""
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# TODO: split out into sudo_args/become_args.
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@abc.abstractmethod
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def mitogen_via(self):
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"""
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The value of the mitogen_via= variable for this connection. Indicates
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the connection should be established via an intermediary.
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"""
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@abc.abstractmethod
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def mitogen_kind(self):
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"""
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The type of container to use with the "setns" transport.
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"""
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@abc.abstractmethod
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def mitogen_mask_remote_name(self):
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"""
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Specifies whether to set a fixed "remote_name" field. The remote_name
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is the suffix of `argv[0]` for remote interpreters. By default it
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includes identifying information from the local process, which may be
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undesirable in some circumstances.
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"""
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@abc.abstractmethod
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def mitogen_buildah_path(self):
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"""
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The path to the "buildah" program for the 'buildah' transport.
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"""
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@abc.abstractmethod
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def mitogen_docker_path(self):
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"""
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The path to the "docker" program for the 'docker' transport.
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"""
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@abc.abstractmethod
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def mitogen_kubectl_path(self):
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"""
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The path to the "kubectl" program for the 'docker' transport.
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"""
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@abc.abstractmethod
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def mitogen_lxc_path(self):
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"""
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The path to the "lxc" program for the 'lxd' transport.
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"""
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@abc.abstractmethod
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def mitogen_lxc_attach_path(self):
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"""
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The path to the "lxc-attach" program for the 'lxc' transport.
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"""
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@abc.abstractmethod
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def mitogen_lxc_info_path(self):
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"""
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The path to the "lxc-info" program for the 'lxc' transport.
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"""
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@abc.abstractmethod
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def mitogen_machinectl_path(self):
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"""
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The path to the "machinectl" program for the 'setns' transport.
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"""
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@abc.abstractmethod
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def mitogen_ssh_keepalive_interval(self):
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"""
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The SSH ServerAliveInterval.
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"""
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@abc.abstractmethod
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def mitogen_ssh_keepalive_count(self):
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"""
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The SSH ServerAliveCount.
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"""
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@abc.abstractmethod
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def mitogen_ssh_debug_level(self):
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"""
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The SSH debug level.
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"""
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@abc.abstractmethod
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def mitogen_ssh_compression(self):
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"""
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Whether SSH compression is enabled.
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"""
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@abc.abstractmethod
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def extra_args(self):
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"""
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Connection-specific arguments.
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"""
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@abc.abstractmethod
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def ansible_doas_exe(self):
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"""
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Value of "ansible_doas_exe" variable.
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"""
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class PlayContextSpec(Spec):
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"""
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PlayContextSpec takes almost all its information as-is from Ansible's
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PlayContext. It is used for normal connections and delegate_to connections,
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and should always be accurate.
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"""
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def __init__(self, connection, play_context, transport, inventory_name, action):
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self._connection = connection
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self._play_context = play_context
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self._transport = transport
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self._inventory_name = inventory_name
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self._task_vars = self._connection._get_task_vars()
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# used to run interpreter discovery
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self._action = action
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def transport(self):
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return self._transport
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def inventory_name(self):
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return self._inventory_name
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def remote_addr(self):
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return self._play_context.remote_addr
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def remote_user(self):
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return self._play_context.remote_user
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def become(self):
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return self._play_context.become
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def become_method(self):
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return self._play_context.become_method
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def become_user(self):
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return self._play_context.become_user
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def become_pass(self):
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return optional_secret(self._play_context.become_pass)
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def password(self):
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return optional_secret(self._play_context.password)
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def port(self):
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return self._play_context.port
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def python_path(self):
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s = self._connection.get_task_var('ansible_python_interpreter')
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# #511, #536: executor/module_common.py::_get_shebang() hard-wires
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# "/usr/bin/python" as the default interpreter path if no other
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# interpreter is specified.
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return parse_python_path(
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s or '/usr/bin/python',
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task_vars=self._task_vars,
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action=self._action)
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def private_key_file(self):
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return self._play_context.private_key_file
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def ssh_executable(self):
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return self._play_context.ssh_executable
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def timeout(self):
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return self._play_context.timeout
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def ansible_ssh_timeout(self):
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return (
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self._connection.get_task_var('ansible_timeout') or
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self._connection.get_task_var('ansible_ssh_timeout') or
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self.timeout()
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)
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def ssh_args(self):
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return [
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mitogen.core.to_text(term)
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for s in (
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getattr(self._play_context, 'ssh_args', ''),
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getattr(self._play_context, 'ssh_common_args', ''),
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getattr(self._play_context, 'ssh_extra_args', '')
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)
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for term in ansible.utils.shlex.shlex_split(s or '')
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]
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def become_exe(self):
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# In Ansible 2.8, PlayContext.become_exe always has a default value due
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# to the new options mechanism. Previously it was only set if a value
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# ("somewhere") had been specified for the task.
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# For consistency in the tests, here we make older Ansibles behave like
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# newer Ansibles.
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exe = self._play_context.become_exe
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if exe is None and self._play_context.become_method == 'sudo':
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exe = 'sudo'
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return exe
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def sudo_args(self):
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return [
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mitogen.core.to_text(term)
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for term in ansible.utils.shlex.shlex_split(
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first_true((
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self._play_context.become_flags,
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# Ansible <=2.7.
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getattr(self._play_context, 'sudo_flags', ''),
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# Ansible <=2.3.
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getattr(C, 'DEFAULT_BECOME_FLAGS', ''),
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getattr(C, 'DEFAULT_SUDO_FLAGS', '')
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), default='')
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)
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]
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def mitogen_via(self):
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return self._connection.get_task_var('mitogen_via')
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def mitogen_kind(self):
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return self._connection.get_task_var('mitogen_kind')
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def mitogen_mask_remote_name(self):
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return self._connection.get_task_var('mitogen_mask_remote_name')
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def mitogen_buildah_path(self):
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return self._connection.get_task_var('mitogen_buildah_path')
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def mitogen_docker_path(self):
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return self._connection.get_task_var('mitogen_docker_path')
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def mitogen_kubectl_path(self):
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return self._connection.get_task_var('mitogen_kubectl_path')
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def mitogen_lxc_path(self):
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return self._connection.get_task_var('mitogen_lxc_path')
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def mitogen_lxc_attach_path(self):
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return self._connection.get_task_var('mitogen_lxc_attach_path')
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def mitogen_lxc_info_path(self):
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return self._connection.get_task_var('mitogen_lxc_info_path')
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def mitogen_ssh_keepalive_interval(self):
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return self._connection.get_task_var('mitogen_ssh_keepalive_interval')
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def mitogen_ssh_keepalive_count(self):
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return self._connection.get_task_var('mitogen_ssh_keepalive_count')
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def mitogen_machinectl_path(self):
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return self._connection.get_task_var('mitogen_machinectl_path')
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def mitogen_ssh_debug_level(self):
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return self._connection.get_task_var('mitogen_ssh_debug_level')
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def mitogen_ssh_compression(self):
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return self._connection.get_task_var('mitogen_ssh_compression')
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def extra_args(self):
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return self._connection.get_extra_args()
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def ansible_doas_exe(self):
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return (
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self._connection.get_task_var('ansible_doas_exe') or
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os.environ.get('ANSIBLE_DOAS_EXE')
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)
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class MitogenViaSpec(Spec):
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"""
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MitogenViaSpec takes most of its information from the HostVars of the
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running task. HostVars is a lightweight wrapper around VariableManager, so
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it is better to say that VariableManager.get_vars() is the ultimate source
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of MitogenViaSpec's information.
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Due to this, mitogen_via= hosts must have all their configuration
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information represented as host and group variables. We cannot use any
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per-task configuration, as all that data belongs to the real target host.
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Ansible uses all kinds of strange historical logic for calculating
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variables, including making their precedence configurable. MitogenViaSpec
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must ultimately reimplement all of that logic. It is likely that if you are
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having a configruation problem with connection delegation, the answer to
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your problem lies in the method implementations below!
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"""
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def __init__(self, inventory_name, host_vars, task_vars, become_method, become_user,
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play_context, action):
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"""
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:param str inventory_name:
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The inventory name of the intermediary machine, i.e. not the target
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machine.
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:param dict host_vars:
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The HostVars magic dictionary provided by Ansible in task_vars.
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:param dict task_vars:
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Task vars provided by Ansible.
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:param str become_method:
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If the mitogen_via= spec included a become method, the method it
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specifies.
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:param str become_user:
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If the mitogen_via= spec included a become user, the user it
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specifies.
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:param PlayContext play_context:
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For some global values **only**, the PlayContext used to describe
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the real target machine. Values from this object are **strictly
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restricted** to values that are Ansible-global, e.g. the passwords
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specified interactively.
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:param ActionModuleMixin action:
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Backref to the ActionModuleMixin required for ansible interpreter discovery
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"""
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self._inventory_name = inventory_name
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self._host_vars = host_vars
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self._task_vars = task_vars
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self._become_method = become_method
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self._become_user = become_user
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# Dangerous! You may find a variable you want in this object, but it's
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# almost certainly for the wrong machine!
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self._dangerous_play_context = play_context
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self._action = action
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def transport(self):
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return (
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self._host_vars.get('ansible_connection') or
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C.DEFAULT_TRANSPORT
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)
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def inventory_name(self):
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return self._inventory_name
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def remote_addr(self):
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# play_context.py::MAGIC_VARIABLE_MAPPING
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return (
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self._host_vars.get('ansible_ssh_host') or
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self._host_vars.get('ansible_host') or
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self._inventory_name
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)
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def remote_user(self):
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return (
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self._host_vars.get('ansible_ssh_user') or
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self._host_vars.get('ansible_user') or
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C.DEFAULT_REMOTE_USER
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)
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def become(self):
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return bool(self._become_user)
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def become_method(self):
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return (
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self._become_method or
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self._host_vars.get('ansible_become_method') or
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C.DEFAULT_BECOME_METHOD
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)
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def become_user(self):
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return self._become_user
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def become_pass(self):
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return optional_secret(
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self._host_vars.get('ansible_become_password') or
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self._host_vars.get('ansible_become_pass')
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)
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def password(self):
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return optional_secret(
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self._host_vars.get('ansible_ssh_pass') or
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self._host_vars.get('ansible_password')
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)
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def port(self):
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return (
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self._host_vars.get('ansible_ssh_port') or
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self._host_vars.get('ansible_port') or
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C.DEFAULT_REMOTE_PORT
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)
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def python_path(self):
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s = self._host_vars.get('ansible_python_interpreter')
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# #511, #536: executor/module_common.py::_get_shebang() hard-wires
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# "/usr/bin/python" as the default interpreter path if no other
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# interpreter is specified.
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return parse_python_path(
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s or '/usr/bin/python',
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task_vars=self._task_vars,
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action=self._action)
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def private_key_file(self):
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# TODO: must come from PlayContext too.
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return (
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|
self._host_vars.get('ansible_ssh_private_key_file') or
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|
self._host_vars.get('ansible_private_key_file') or
|
|
C.DEFAULT_PRIVATE_KEY_FILE
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)
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def ssh_executable(self):
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return (
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self._host_vars.get('ansible_ssh_executable') or
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|
C.ANSIBLE_SSH_EXECUTABLE
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|
)
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|
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def timeout(self):
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# TODO: must come from PlayContext too.
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return C.DEFAULT_TIMEOUT
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def ansible_ssh_timeout(self):
|
|
return (
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|
self._host_vars.get('ansible_timeout') or
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|
self._host_vars.get('ansible_ssh_timeout') or
|
|
self.timeout()
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|
)
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|
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def ssh_args(self):
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|
return [
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mitogen.core.to_text(term)
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|
for s in (
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|
(
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|
self._host_vars.get('ansible_ssh_args') or
|
|
getattr(C, 'ANSIBLE_SSH_ARGS', None) or
|
|
os.environ.get('ANSIBLE_SSH_ARGS')
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|
# TODO: ini entry. older versions.
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|
),
|
|
(
|
|
self._host_vars.get('ansible_ssh_common_args') or
|
|
os.environ.get('ANSIBLE_SSH_COMMON_ARGS')
|
|
# TODO: ini entry.
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|
),
|
|
(
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|
self._host_vars.get('ansible_ssh_extra_args') or
|
|
os.environ.get('ANSIBLE_SSH_EXTRA_ARGS')
|
|
# TODO: ini entry.
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|
),
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|
)
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for term in ansible.utils.shlex.shlex_split(s)
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if s
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]
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|
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|
def become_exe(self):
|
|
return (
|
|
self._host_vars.get('ansible_become_exe') or
|
|
C.DEFAULT_BECOME_EXE
|
|
)
|
|
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|
def sudo_args(self):
|
|
return [
|
|
mitogen.core.to_text(term)
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|
for s in (
|
|
self._host_vars.get('ansible_sudo_flags') or '',
|
|
self._host_vars.get('ansible_become_flags') or '',
|
|
)
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|
for term in ansible.utils.shlex.shlex_split(s)
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|
]
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|
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|
def mitogen_via(self):
|
|
return self._host_vars.get('mitogen_via')
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|
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|
def mitogen_kind(self):
|
|
return self._host_vars.get('mitogen_kind')
|
|
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|
def mitogen_mask_remote_name(self):
|
|
return self._host_vars.get('mitogen_mask_remote_name')
|
|
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|
def mitogen_buildah_path(self):
|
|
return self._host_vars.get('mitogen_buildah_path')
|
|
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|
def mitogen_docker_path(self):
|
|
return self._host_vars.get('mitogen_docker_path')
|
|
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|
def mitogen_kubectl_path(self):
|
|
return self._host_vars.get('mitogen_kubectl_path')
|
|
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|
def mitogen_lxc_path(self):
|
|
return self.host_vars.get('mitogen_lxc_path')
|
|
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|
def mitogen_lxc_attach_path(self):
|
|
return self._host_vars.get('mitogen_lxc_attach_path')
|
|
|
|
def mitogen_lxc_info_path(self):
|
|
return self._host_vars.get('mitogen_lxc_info_path')
|
|
|
|
def mitogen_ssh_keepalive_interval(self):
|
|
return self._host_vars.get('mitogen_ssh_keepalive_interval')
|
|
|
|
def mitogen_ssh_keepalive_count(self):
|
|
return self._host_vars.get('mitogen_ssh_keepalive_count')
|
|
|
|
def mitogen_machinectl_path(self):
|
|
return self._host_vars.get('mitogen_machinectl_path')
|
|
|
|
def mitogen_ssh_debug_level(self):
|
|
return self._host_vars.get('mitogen_ssh_debug_level')
|
|
|
|
def mitogen_ssh_compression(self):
|
|
return self._host_vars.get('mitogen_ssh_compression')
|
|
|
|
def extra_args(self):
|
|
return [] # TODO
|
|
|
|
def ansible_doas_exe(self):
|
|
return (
|
|
self._host_vars.get('ansible_doas_exe') or
|
|
os.environ.get('ANSIBLE_DOAS_EXE')
|
|
)
|