425 lines
17 KiB
Python
425 lines
17 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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import logging
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import os
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import pwd
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import random
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import traceback
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try:
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from shlex import quote as shlex_quote
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except ImportError:
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from pipes import quote as shlex_quote
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from ansible.module_utils._text import to_bytes
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from ansible.parsing.utils.jsonify import jsonify
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import ansible
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import ansible.constants
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import ansible.plugins
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import ansible.plugins.action
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import mitogen.core
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import mitogen.select
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import mitogen.utils
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import ansible_mitogen.connection
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import ansible_mitogen.planner
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import ansible_mitogen.target
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from ansible.module_utils._text import to_text
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LOG = logging.getLogger(__name__)
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class ActionModuleMixin(ansible.plugins.action.ActionBase):
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"""
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The Mitogen-patched PluginLoader dynamically mixes this into every action
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class that Ansible attempts to load. It exists to override all the
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assumptions built into the base action class that should really belong in
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some middle layer, or at least in the connection layer.
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Functionality is defined here for:
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* Capturing the final set of task variables and giving Connection a chance
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to update its idea of the correct execution environment, before any
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attempt is made to call a Connection method. While it's not expected for
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the interpreter to change on a per-task basis, Ansible permits this, and
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so it must be supported.
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* Overriding lots of methods that try to call out to shell for mundane
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reasons, such as copying files around, changing file permissions,
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creating temporary directories and suchlike.
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* Short-circuiting any use of Ansiballz or related code for executing a
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module remotely using shell commands and SSH.
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* Short-circuiting most of the logic in dealing with the fact that Ansible
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always runs become: tasks across at least the SSH user account and the
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destination user account, and handling the security permission issues
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that crop up due to this. Mitogen always runs a task completely within
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the target user account, so it's not a problem for us.
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"""
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def __init__(self, task, connection, *args, **kwargs):
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"""
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Verify the received connection is really a Mitogen connection. If not,
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transmute this instance back into the original unadorned base class.
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This allows running the Mitogen strategy in mixed-target playbooks,
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where some targets use SSH while others use WinRM or some fancier UNIX
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connection plug-in. That's because when the Mitogen strategy is active,
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ActionModuleMixin is unconditionally mixed into any action module that
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is instantiated, and there is no direct way for the monkey-patch to
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know what kind of connection will be used upfront.
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"""
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super(ActionModuleMixin, self).__init__(task, connection, *args, **kwargs)
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if not isinstance(connection, ansible_mitogen.connection.Connection):
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_, self.__class__ = type(self).__bases__
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def run(self, tmp=None, task_vars=None):
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"""
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Override run() to notify Connection of task-specific data, so it has a
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chance to know e.g. the Python interpreter in use.
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"""
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self._connection.on_action_run(
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task_vars=task_vars,
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delegate_to_hostname=self._task.delegate_to,
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loader_basedir=self._loader.get_basedir(),
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)
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return super(ActionModuleMixin, self).run(tmp, task_vars)
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COMMAND_RESULT = {
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'rc': 0,
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'stdout': '',
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'stdout_lines': [],
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'stderr': ''
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}
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def fake_shell(self, func, stdout=False):
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"""
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Execute a function and decorate its return value in the style of
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_low_level_execute_command(). This produces a return value that looks
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like some shell command was run, when really func() was implemented
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entirely in Python.
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If the function raises :py:class:`mitogen.core.CallError`, this will be
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translated into a failed shell command with a non-zero exit status.
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:param func:
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Function invoked as `func()`.
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:returns:
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See :py:attr:`COMMAND_RESULT`.
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"""
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dct = self.COMMAND_RESULT.copy()
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try:
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rc = func()
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if stdout:
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dct['stdout'] = repr(rc)
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except mitogen.core.CallError:
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LOG.exception('While emulating a shell command')
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dct['rc'] = 1
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dct['stderr'] = traceback.format_exc()
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return dct
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def _remote_file_exists(self, path):
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"""
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Determine if `path` exists by directly invoking os.path.exists() in the
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target user account.
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"""
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LOG.debug('_remote_file_exists(%r)', path)
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return self._connection.get_chain().call(
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ansible_mitogen.target.file_exists,
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mitogen.utils.cast(path)
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)
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def _configure_module(self, module_name, module_args, task_vars=None):
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"""
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Mitogen does not use the Ansiballz framework. This call should never
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happen when ActionMixin is active, so crash if it does.
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"""
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assert False, "_configure_module() should never be called."
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def _is_pipelining_enabled(self, module_style, wrap_async=False):
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"""
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Mitogen does not use SSH pipelining. This call should never happen when
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ActionMixin is active, so crash if it does.
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"""
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assert False, "_is_pipelining_enabled() should never be called."
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def _generate_tmp_path(self):
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return os.path.join(
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self._connection.get_good_temp_dir(),
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'ansible_mitogen_action_%016x' % (
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random.getrandbits(8*8),
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)
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)
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def _make_tmp_path(self, remote_user=None):
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"""
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Create a temporary subdirectory as a child of the temporary directory
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managed by the remote interpreter.
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"""
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LOG.debug('_make_tmp_path(remote_user=%r)', remote_user)
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path = self._generate_tmp_path()
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LOG.debug('Temporary directory: %r', path)
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self._connection.get_chain().call_no_reply(os.mkdir, path)
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self._connection._shell.tmpdir = path
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return path
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def _remove_tmp_path(self, tmp_path):
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"""
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Replace the base implementation's invocation of rm -rf, replacing it
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with a pipelined call to :func:`ansible_mitogen.target.prune_tree`.
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"""
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LOG.debug('_remove_tmp_path(%r)', tmp_path)
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if tmp_path is None and ansible.__version__ > '2.6':
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tmp_path = self._connection._shell.tmpdir # 06f73ad578d
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if tmp_path is not None:
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self._connection.get_chain().call_no_reply(
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ansible_mitogen.target.prune_tree,
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tmp_path,
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)
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self._connection._shell.tmpdir = None
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def _transfer_data(self, remote_path, data):
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"""
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Used by the base _execute_module(), and in <2.4 also by the template
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action module, and probably others.
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"""
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if isinstance(data, dict):
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data = jsonify(data)
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if not isinstance(data, bytes):
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data = to_bytes(data, errors='surrogate_or_strict')
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LOG.debug('_transfer_data(%r, %s ..%d bytes)',
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remote_path, type(data), len(data))
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self._connection.put_data(remote_path, data)
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return remote_path
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#: Actions listed here cause :func:`_fixup_perms2` to avoid a needless
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#: roundtrip, as they modify file modes separately afterwards. This is due
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#: to the method prototype having a default of `execute=True`.
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FIXUP_PERMS_RED_HERRING = set(['copy'])
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def _fixup_perms2(self, remote_paths, remote_user=None, execute=True):
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"""
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Mitogen always executes ActionBase helper methods in the context of the
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target user account, so it is never necessary to modify permissions
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except to ensure the execute bit is set if requested.
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"""
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LOG.debug('_fixup_perms2(%r, remote_user=%r, execute=%r)',
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remote_paths, remote_user, execute)
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if execute and self._task.action not in self.FIXUP_PERMS_RED_HERRING:
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return self._remote_chmod(remote_paths, mode='u+x')
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return self.COMMAND_RESULT.copy()
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def _remote_chmod(self, paths, mode, sudoable=False):
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"""
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Issue an asynchronous set_file_mode() call for every path in `paths`,
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then format the resulting return value list with fake_shell().
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"""
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LOG.debug('_remote_chmod(%r, mode=%r, sudoable=%r)',
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paths, mode, sudoable)
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return self.fake_shell(lambda: mitogen.select.Select.all(
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self._connection.get_chain().call_async(
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ansible_mitogen.target.set_file_mode, path, mode
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)
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for path in paths
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))
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def _remote_chown(self, paths, user, sudoable=False):
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"""
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Issue an asynchronous os.chown() call for every path in `paths`, then
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format the resulting return value list with fake_shell().
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"""
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LOG.debug('_remote_chown(%r, user=%r, sudoable=%r)',
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paths, user, sudoable)
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ent = self._connection.get_chain().call(pwd.getpwnam, user)
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return self.fake_shell(lambda: mitogen.select.Select.all(
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self._connection.get_chain().call_async(
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os.chown, path, ent.pw_uid, ent.pw_gid
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)
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for path in paths
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))
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def _remote_expand_user(self, path, sudoable=True):
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"""
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Replace the base implementation's attempt to emulate
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os.path.expanduser() with an actual call to os.path.expanduser().
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:param bool sudoable:
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If :data:`True`, indicate unqualified tilde ("~" with no username)
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should be evaluated in the context of the login account, not any
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become_user.
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"""
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LOG.debug('_remote_expand_user(%r, sudoable=%r)', path, sudoable)
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if not path.startswith('~'):
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# /home/foo -> /home/foo
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return path
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if sudoable or not self._play_context.become:
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if path == '~':
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# ~ -> /home/dmw
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return self._connection.homedir
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if path.startswith('~/'):
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# ~/.ansible -> /home/dmw/.ansible
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return os.path.join(self._connection.homedir, path[2:])
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# ~root/.ansible -> /root/.ansible
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return self._connection.get_chain(use_login=(not sudoable)).call(
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os.path.expanduser,
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mitogen.utils.cast(path),
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)
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def get_task_timeout_secs(self):
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"""
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Return the task "async:" value, portable across 2.4-2.5.
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"""
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try:
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return self._task.async_val
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except AttributeError:
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return getattr(self._task, 'async')
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def _temp_file_gibberish(self, module_args, wrap_async):
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# Ansible>2.5 module_utils reuses the action's temporary directory if
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# one exists. Older versions error if this key is present.
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if ansible.__version__ > '2.5':
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if wrap_async:
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# Sharing is not possible with async tasks, as in that case,
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# the directory must outlive the action plug-in.
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module_args['_ansible_tmpdir'] = None
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else:
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module_args['_ansible_tmpdir'] = self._connection._shell.tmpdir
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# If _ansible_tmpdir is unset, Ansible>2.6 module_utils will use
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# _ansible_remote_tmp as the location to create the module's temporary
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# directory. Older versions error if this key is present.
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if ansible.__version__ > '2.6':
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module_args['_ansible_remote_tmp'] = (
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self._connection.get_good_temp_dir()
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)
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def _execute_module(self, module_name=None, module_args=None, tmp=None,
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task_vars=None, persist_files=False,
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delete_remote_tmp=True, wrap_async=False):
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"""
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Collect up a module's execution environment then use it to invoke
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target.run_module() or helpers.run_module_async() in the target
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context.
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"""
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if module_name is None:
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module_name = self._task.action
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if module_args is None:
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module_args = self._task.args
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if task_vars is None:
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task_vars = {}
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self._update_module_args(module_name, module_args, task_vars)
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env = {}
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self._compute_environment_string(env)
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self._temp_file_gibberish(module_args, wrap_async)
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self._connection._connect()
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result = ansible_mitogen.planner.invoke(
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ansible_mitogen.planner.Invocation(
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action=self,
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connection=self._connection,
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module_name=mitogen.core.to_text(module_name),
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module_args=mitogen.utils.cast(module_args),
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task_vars=task_vars,
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templar=self._templar,
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env=mitogen.utils.cast(env),
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wrap_async=wrap_async,
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timeout_secs=self.get_task_timeout_secs(),
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)
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)
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if ansible.__version__ < '2.5' and delete_remote_tmp and \
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getattr(self._connection._shell, 'tmpdir', None) is not None:
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# Built-in actions expected tmpdir to be cleaned up automatically
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# on _execute_module().
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self._remove_tmp_path(self._connection._shell.tmpdir)
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return result
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def _postprocess_response(self, result):
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"""
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Apply fixups mimicking ActionBase._execute_module(); this is copied
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verbatim from action/__init__.py, the guts of _parse_returned_data are
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garbage and should be removed or reimplemented once tests exist.
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:param dict result:
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Dictionary with format::
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{
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"rc": int,
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"stdout": "stdout data",
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"stderr": "stderr data"
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}
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"""
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data = self._parse_returned_data(result)
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# Cutpasted from the base implementation.
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if 'stdout' in data and 'stdout_lines' not in data:
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data['stdout_lines'] = (data['stdout'] or u'').splitlines()
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if 'stderr' in data and 'stderr_lines' not in data:
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data['stderr_lines'] = (data['stderr'] or u'').splitlines()
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return data
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def _low_level_execute_command(self, cmd, sudoable=True, in_data=None,
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executable=None,
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encoding_errors='surrogate_then_replace',
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chdir=None):
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"""
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Override the base implementation by simply calling
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target.exec_command() in the target context.
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"""
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LOG.debug('_low_level_execute_command(%r, in_data=%r, exe=%r, dir=%r)',
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cmd, type(in_data), executable, chdir)
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if executable is None: # executable defaults to False
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executable = self._play_context.executable
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if executable:
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cmd = executable + ' -c ' + shlex_quote(cmd)
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rc, stdout, stderr = self._connection.exec_command(
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cmd=cmd,
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in_data=in_data,
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sudoable=sudoable,
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mitogen_chdir=chdir,
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)
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stdout_text = to_text(stdout, errors=encoding_errors)
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return {
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'rc': rc,
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'stdout': stdout_text,
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'stdout_lines': stdout_text.splitlines(),
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'stderr': stderr,
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}
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