mirror of
https://github.com/ansible-collections/community.general.git
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647 lines
28 KiB
Python
647 lines
28 KiB
Python
# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
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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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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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import base64
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import json
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import subprocess
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import sys
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import time
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from ansible.compat.six import iteritems, string_types
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from ansible import constants as C
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from ansible.errors import AnsibleError, AnsibleParserError, AnsibleUndefinedVariable, AnsibleConnectionFailure
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from ansible.playbook.conditional import Conditional
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from ansible.playbook.task import Task
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from ansible.template import Templar
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from ansible.utils.encrypt import key_for_hostname
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from ansible.utils.listify import listify_lookup_plugin_terms
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from ansible.utils.unicode import to_unicode
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from ansible.vars.unsafe_proxy import UnsafeProxy, wrap_var
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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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__all__ = ['TaskExecutor']
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class TaskExecutor:
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'''
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This is the main worker class for the executor pipeline, which
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handles loading an action plugin to actually dispatch the task to
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a given host. This class roughly corresponds to the old Runner()
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class.
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'''
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# Modules that we optimize by squashing loop items into a single call to
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# the module
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SQUASH_ACTIONS = frozenset(C.DEFAULT_SQUASH_ACTIONS)
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def __init__(self, host, task, job_vars, play_context, new_stdin, loader, shared_loader_obj):
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self._host = host
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self._task = task
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self._job_vars = job_vars
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self._play_context = play_context
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self._new_stdin = new_stdin
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self._loader = loader
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self._shared_loader_obj = shared_loader_obj
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self._connection = None
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def run(self):
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'''
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The main executor entrypoint, where we determine if the specified
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task requires looping and either runs the task with
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'''
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display.debug("in run()")
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try:
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# lookup plugins need to know if this task is executing from
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# a role, so that it can properly find files/templates/etc.
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roledir = None
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if self._task._role:
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roledir = self._task._role._role_path
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self._job_vars['roledir'] = roledir
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items = self._get_loop_items()
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if items is not None:
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if len(items) > 0:
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item_results = self._run_loop(items)
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# loop through the item results, and remember the changed/failed
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# result flags based on any item there.
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changed = False
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failed = False
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for item in item_results:
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if 'changed' in item and item['changed']:
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changed = True
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if 'failed' in item and item['failed']:
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failed = True
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# create the overall result item, and set the changed/failed
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# flags there to reflect the overall result of the loop
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res = dict(results=item_results)
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if changed:
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res['changed'] = True
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if failed:
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res['failed'] = True
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res['msg'] = 'One or more items failed'
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else:
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res['msg'] = 'All items completed'
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else:
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res = dict(changed=False, skipped=True, skipped_reason='No items in the list', results=[])
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else:
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display.debug("calling self._execute()")
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res = self._execute()
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display.debug("_execute() done")
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# make sure changed is set in the result, if it's not present
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if 'changed' not in res:
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res['changed'] = False
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def _clean_res(res):
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if isinstance(res, dict):
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for k in res.keys():
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res[k] = _clean_res(res[k])
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elif isinstance(res, list):
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for idx,item in enumerate(res):
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res[idx] = _clean_res(item)
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elif isinstance(res, UnsafeProxy):
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return res._obj
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return res
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display.debug("dumping result to json")
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res = _clean_res(res)
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display.debug("done dumping result, returning")
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return res
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except AnsibleError as e:
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return dict(failed=True, msg=to_unicode(e, nonstring='simplerepr'))
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finally:
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try:
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self._connection.close()
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except AttributeError:
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pass
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except Exception as e:
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display.debug(u"error closing connection: %s" % to_unicode(e))
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def _get_loop_items(self):
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'''
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Loads a lookup plugin to handle the with_* portion of a task (if specified),
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and returns the items result.
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'''
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# save the play context variables to a temporary dictionary,
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# so that we can modify the job vars without doing a full copy
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# and later restore them to avoid modifying things too early
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play_context_vars = dict()
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self._play_context.update_vars(play_context_vars)
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old_vars = dict()
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for k in play_context_vars.keys():
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if k in self._job_vars:
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old_vars[k] = self._job_vars[k]
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self._job_vars[k] = play_context_vars[k]
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templar = Templar(loader=self._loader, shared_loader_obj=self._shared_loader_obj, variables=self._job_vars)
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items = None
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if self._task.loop:
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if self._task.loop in self._shared_loader_obj.lookup_loader:
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#TODO: remove convert_bare true and deprecate this in with_
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if self._task.loop == 'first_found':
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# first_found loops are special. If the item is undefined
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# then we want to fall through to the next value rather
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# than failing.
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loop_terms = listify_lookup_plugin_terms(terms=self._task.loop_args, templar=templar,
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loader=self._loader, fail_on_undefined=False, convert_bare=True)
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loop_terms = [t for t in loop_terms if not templar._contains_vars(t)]
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else:
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try:
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loop_terms = listify_lookup_plugin_terms(terms=self._task.loop_args, templar=templar,
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loader=self._loader, fail_on_undefined=True, convert_bare=True)
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except AnsibleUndefinedVariable as e:
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if u'has no attribute' in to_unicode(e):
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loop_terms = []
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display.deprecated("Skipping task due to undefined attribute, in the future this will be a fatal error.")
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else:
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raise
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items = self._shared_loader_obj.lookup_loader.get(self._task.loop, loader=self._loader,
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templar=templar).run(terms=loop_terms, variables=self._job_vars)
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else:
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raise AnsibleError("Unexpected failure in finding the lookup named '%s' in the available lookup plugins" % self._task.loop)
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# now we restore any old job variables that may have been modified,
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# and delete them if they were in the play context vars but not in
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# the old variables dictionary
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for k in play_context_vars.keys():
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if k in old_vars:
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self._job_vars[k] = old_vars[k]
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else:
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del self._job_vars[k]
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if items:
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from ansible.vars.unsafe_proxy import UnsafeProxy
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for idx, item in enumerate(items):
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if item is not None and not isinstance(item, UnsafeProxy):
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items[idx] = UnsafeProxy(item)
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return items
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def _run_loop(self, items):
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'''
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Runs the task with the loop items specified and collates the result
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into an array named 'results' which is inserted into the final result
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along with the item for which the loop ran.
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'''
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results = []
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# make copies of the job vars and task so we can add the item to
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# the variables and re-validate the task with the item variable
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#task_vars = self._job_vars.copy()
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task_vars = self._job_vars
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items = self._squash_items(items, task_vars)
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for item in items:
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task_vars['item'] = item
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try:
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tmp_task = self._task.copy()
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tmp_play_context = self._play_context.copy()
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except AnsibleParserError as e:
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results.append(dict(failed=True, msg=to_unicode(e)))
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continue
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# now we swap the internal task and play context with their copies,
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# execute, and swap them back so we can do the next iteration cleanly
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(self._task, tmp_task) = (tmp_task, self._task)
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(self._play_context, tmp_play_context) = (tmp_play_context, self._play_context)
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res = self._execute(variables=task_vars)
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(self._task, tmp_task) = (tmp_task, self._task)
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(self._play_context, tmp_play_context) = (tmp_play_context, self._play_context)
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# now update the result with the item info, and append the result
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# to the list of results
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res['item'] = item
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#TODO: send item results to callback here, instead of all at the end
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results.append(res)
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return results
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def _squash_items(self, items, variables):
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'''
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Squash items down to a comma-separated list for certain modules which support it
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(typically package management modules).
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'''
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# _task.action could contain templatable strings (via action: and
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# local_action:) Template it before comparing. If we don't end up
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# optimizing it here, the templatable string might use template vars
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# that aren't available until later (it could even use vars from the
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# with_items loop) so don't make the templated string permanent yet.
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templar = Templar(loader=self._loader, shared_loader_obj=self._shared_loader_obj, variables=variables)
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task_action = self._task.action
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if templar._contains_vars(task_action):
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task_action = templar.template(task_action, fail_on_undefined=False)
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if len(items) > 0 and task_action in self.SQUASH_ACTIONS:
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if all(isinstance(o, string_types) for o in items):
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final_items = []
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name = self._task.args.pop('name', None) or self._task.args.pop('pkg', None)
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# The user is doing an upgrade or some other operation
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# that doesn't take name or pkg.
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if name:
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for item in items:
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variables['item'] = item
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if self._task.evaluate_conditional(templar, variables):
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if templar._contains_vars(name):
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new_item = templar.template(name, cache=False)
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final_items.append(new_item)
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else:
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final_items.append(item)
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self._task.args['name'] = final_items
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return [final_items]
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#elif:
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# Right now we only optimize single entries. In the future we
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# could optimize more types:
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# * lists can be squashed together
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# * dicts could squash entries that match in all cases except the
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# name or pkg field.
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# Note: we really should be checking that the name or pkg field
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# contains a template that expands with our with_items values.
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# If it doesn't then we may break things
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return items
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def _execute(self, variables=None):
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'''
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The primary workhorse of the executor system, this runs the task
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on the specified host (which may be the delegated_to host) and handles
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the retry/until and block rescue/always execution
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'''
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if variables is None:
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variables = self._job_vars
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templar = Templar(loader=self._loader, shared_loader_obj=self._shared_loader_obj, variables=variables)
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context_validation_error = None
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try:
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# apply the given task's information to the connection info,
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# which may override some fields already set by the play or
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# the options specified on the command line
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self._play_context = self._play_context.set_task_and_variable_override(task=self._task, variables=variables, templar=templar)
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# fields set from the play/task may be based on variables, so we have to
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# do the same kind of post validation step on it here before we use it.
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self._play_context.post_validate(templar=templar)
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# We also add "magic" variables back into the variables dict to make sure
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# a certain subset of variables exist.
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self._play_context.update_vars(variables)
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except AnsibleError as e:
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# save the error, which we'll raise later if we don't end up
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# skipping this task during the conditional evaluation step
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context_validation_error = e
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# Evaluate the conditional (if any) for this task, which we do before running
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# the final task post-validation. We do this before the post validation due to
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# the fact that the conditional may specify that the task be skipped due to a
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# variable not being present which would otherwise cause validation to fail
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try:
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if not self._task.evaluate_conditional(templar, variables):
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display.debug("when evaluation failed, skipping this task")
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return dict(changed=False, skipped=True, skip_reason='Conditional check failed', _ansible_no_log=self._play_context.no_log)
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except AnsibleError:
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# skip conditional exception in the case of includes as the vars needed might not be avaiable except in the included tasks or due to tags
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if self._task.action != 'include':
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raise
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# if we ran into an error while setting up the PlayContext, raise it now
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if context_validation_error is not None:
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raise context_validation_error
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# if this task is a TaskInclude, we just return now with a success code so the
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# main thread can expand the task list for the given host
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if self._task.action == 'include':
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include_variables = self._task.args.copy()
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include_file = include_variables.pop('_raw_params', None)
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if not include_file:
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return dict(failed=True, msg="No include file was specified to the include")
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include_file = templar.template(include_file)
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return dict(include=include_file, include_variables=include_variables)
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# Now we do final validation on the task, which sets all fields to their final values.
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self._task.post_validate(templar=templar)
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if '_variable_params' in self._task.args:
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variable_params = self._task.args.pop('_variable_params')
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if isinstance(variable_params, dict):
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display.deprecated("Using variables for task params is unsafe, especially if the variables come from an external source like facts")
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variable_params.update(self._task.args)
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self._task.args = variable_params
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# get the connection and the handler for this execution
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if not self._connection or not getattr(self._connection, 'connected', False):
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self._connection = self._get_connection(variables=variables, templar=templar)
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self._connection.set_host_overrides(host=self._host)
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self._handler = self._get_action_handler(connection=self._connection, templar=templar)
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# And filter out any fields which were set to default(omit), and got the omit token value
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omit_token = variables.get('omit')
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if omit_token is not None:
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self._task.args = dict((i[0], i[1]) for i in iteritems(self._task.args) if i[1] != omit_token)
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# Read some values from the task, so that we can modify them if need be
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if self._task.until is not None:
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retries = self._task.retries
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if retries <= 0:
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retries = 1
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else:
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retries = 1
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delay = self._task.delay
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if delay < 0:
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delay = 1
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# make a copy of the job vars here, in case we need to update them
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# with the registered variable value later on when testing conditions
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vars_copy = variables.copy()
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display.debug("starting attempt loop")
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result = None
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for attempt in range(retries):
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if attempt > 0:
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display.display("FAILED - RETRYING: %s (%d retries left). Result was: %s" % (self._task, retries-attempt, result), color=C.COLOR_DEBUG)
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result['attempts'] = attempt + 1
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display.debug("running the handler")
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try:
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result = self._handler.run(task_vars=variables)
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except AnsibleConnectionFailure as e:
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return dict(unreachable=True, msg=to_unicode(e))
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display.debug("handler run complete")
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# update the local copy of vars with the registered value, if specified,
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# or any facts which may have been generated by the module execution
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if self._task.register:
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vars_copy[self._task.register] = wrap_var(result.copy())
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if self._task.async > 0:
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# the async_wrapper module returns dumped JSON via its stdout
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# response, so we parse it here and replace the result
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try:
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if 'skipped' in result and result['skipped'] or 'failed' in result and result['failed']:
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return result
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result = json.loads(result.get('stdout'))
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except (TypeError, ValueError) as e:
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return dict(failed=True, msg=u"The async task did not return valid JSON: %s" % to_unicode(e))
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if self._task.poll > 0:
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result = self._poll_async_result(result=result, templar=templar)
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# helper methods for use below in evaluating changed/failed_when
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def _evaluate_changed_when_result(result):
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if self._task.changed_when is not None:
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cond = Conditional(loader=self._loader)
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cond.when = [ self._task.changed_when ]
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result['changed'] = cond.evaluate_conditional(templar, vars_copy)
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def _evaluate_failed_when_result(result):
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if self._task.failed_when is not None:
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cond = Conditional(loader=self._loader)
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cond.when = [ self._task.failed_when ]
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failed_when_result = cond.evaluate_conditional(templar, vars_copy)
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result['failed_when_result'] = result['failed'] = failed_when_result
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return failed_when_result
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return False
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if 'ansible_facts' in result:
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vars_copy.update(result['ansible_facts'])
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# set the failed property if the result has a non-zero rc. This will be
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# overridden below if the failed_when property is set
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if result.get('rc', 0) != 0:
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result['failed'] = True
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# if we didn't skip this task, use the helpers to evaluate the changed/
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# failed_when properties
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if 'skipped' not in result:
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_evaluate_changed_when_result(result)
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_evaluate_failed_when_result(result)
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if attempt < retries - 1:
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cond = Conditional(loader=self._loader)
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cond.when = [ self._task.until ]
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if cond.evaluate_conditional(templar, vars_copy):
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break
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# no conditional check, or it failed, so sleep for the specified time
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time.sleep(delay)
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elif 'failed' not in result:
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break
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# do the final update of the local variables here, for both registered
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# values and any facts which may have been created
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if self._task.register:
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variables[self._task.register] = wrap_var(result)
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if 'ansible_facts' in result:
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variables.update(result['ansible_facts'])
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# save the notification target in the result, if it was specified, as
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# this task may be running in a loop in which case the notification
|
|
# may be item-specific, ie. "notify: service {{item}}"
|
|
if self._task.notify is not None:
|
|
result['_ansible_notify'] = self._task.notify
|
|
|
|
# add the delegated vars to the result, so we can reference them
|
|
# on the results side without having to do any further templating
|
|
# FIXME: we only want a limited set of variables here, so this is currently
|
|
# hardcoded but should be possibly fixed if we want more or if
|
|
# there is another source of truth we can use
|
|
delegated_vars = variables.get('ansible_delegated_vars', dict()).get(self._task.delegate_to, dict()).copy()
|
|
if len(delegated_vars) > 0:
|
|
result["_ansible_delegated_vars"] = dict()
|
|
for k in ('ansible_host', ):
|
|
result["_ansible_delegated_vars"][k] = delegated_vars.get(k)
|
|
|
|
# preserve no_log setting
|
|
result["_ansible_no_log"] = self._play_context.no_log
|
|
|
|
# and return
|
|
display.debug("attempt loop complete, returning result")
|
|
return result
|
|
|
|
def _poll_async_result(self, result, templar):
|
|
'''
|
|
Polls for the specified JID to be complete
|
|
'''
|
|
|
|
async_jid = result.get('ansible_job_id')
|
|
if async_jid is None:
|
|
return dict(failed=True, msg="No job id was returned by the async task")
|
|
|
|
# Create a new psuedo-task to run the async_status module, and run
|
|
# that (with a sleep for "poll" seconds between each retry) until the
|
|
# async time limit is exceeded.
|
|
|
|
async_task = Task().load(dict(action='async_status jid=%s' % async_jid))
|
|
|
|
# Because this is an async task, the action handler is async. However,
|
|
# we need the 'normal' action handler for the status check, so get it
|
|
# now via the action_loader
|
|
normal_handler = self._shared_loader_obj.action_loader.get(
|
|
'normal',
|
|
task=async_task,
|
|
connection=self._connection,
|
|
play_context=self._play_context,
|
|
loader=self._loader,
|
|
templar=templar,
|
|
shared_loader_obj=self._shared_loader_obj,
|
|
)
|
|
|
|
time_left = self._task.async
|
|
while time_left > 0:
|
|
time.sleep(self._task.poll)
|
|
|
|
async_result = normal_handler.run()
|
|
if int(async_result.get('finished', 0)) == 1 or 'failed' in async_result or 'skipped' in async_result:
|
|
break
|
|
|
|
time_left -= self._task.poll
|
|
|
|
if int(async_result.get('finished', 0)) != 1:
|
|
return dict(failed=True, msg="async task did not complete within the requested time")
|
|
else:
|
|
return async_result
|
|
|
|
def _get_connection(self, variables, templar):
|
|
'''
|
|
Reads the connection property for the host, and returns the
|
|
correct connection object from the list of connection plugins
|
|
'''
|
|
|
|
if not self._play_context.remote_addr:
|
|
self._play_context.remote_addr = self._host.address
|
|
|
|
if self._task.delegate_to is not None:
|
|
# since we're delegating, we don't want to use interpreter values
|
|
# which would have been set for the original target host
|
|
for i in variables.keys():
|
|
if i.startswith('ansible_') and i.endswith('_interpreter'):
|
|
del variables[i]
|
|
# now replace the interpreter values with those that may have come
|
|
# from the delegated-to host
|
|
delegated_vars = variables.get('ansible_delegated_vars', dict()).get(self._task.delegate_to, dict())
|
|
if isinstance(delegated_vars, dict):
|
|
for i in delegated_vars:
|
|
if i.startswith("ansible_") and i.endswith("_interpreter"):
|
|
variables[i] = delegated_vars[i]
|
|
|
|
conn_type = self._play_context.connection
|
|
if conn_type == 'smart':
|
|
conn_type = 'ssh'
|
|
if sys.platform.startswith('darwin') and self._play_context.password:
|
|
# due to a current bug in sshpass on OSX, which can trigger
|
|
# a kernel panic even for non-privileged users, we revert to
|
|
# paramiko on that OS when a SSH password is specified
|
|
conn_type = "paramiko"
|
|
else:
|
|
# see if SSH can support ControlPersist if not use paramiko
|
|
try:
|
|
cmd = subprocess.Popen(['ssh','-o','ControlPersist'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
|
|
(out, err) = cmd.communicate()
|
|
if "Bad configuration option" in err or "Usage:" in err:
|
|
conn_type = "paramiko"
|
|
except OSError:
|
|
conn_type = "paramiko"
|
|
|
|
connection = self._shared_loader_obj.connection_loader.get(conn_type, self._play_context, self._new_stdin)
|
|
if not connection:
|
|
raise AnsibleError("the connection plugin '%s' was not found" % conn_type)
|
|
|
|
if self._play_context.accelerate:
|
|
# launch the accelerated daemon here
|
|
ssh_connection = connection
|
|
handler = self._shared_loader_obj.action_loader.get(
|
|
'normal',
|
|
task=self._task,
|
|
connection=ssh_connection,
|
|
play_context=self._play_context,
|
|
loader=self._loader,
|
|
templar=templar,
|
|
shared_loader_obj=self._shared_loader_obj,
|
|
)
|
|
|
|
key = key_for_hostname(self._play_context.remote_addr)
|
|
accelerate_args = dict(
|
|
password=base64.b64encode(key.__str__()),
|
|
port=self._play_context.accelerate_port,
|
|
minutes=C.ACCELERATE_DAEMON_TIMEOUT,
|
|
ipv6=self._play_context.accelerate_ipv6,
|
|
debug=self._play_context.verbosity,
|
|
)
|
|
|
|
connection = self._shared_loader_obj.connection_loader.get('accelerate', self._play_context, self._new_stdin)
|
|
if not connection:
|
|
raise AnsibleError("the connection plugin '%s' was not found" % conn_type)
|
|
|
|
try:
|
|
connection._connect()
|
|
except AnsibleConnectionFailure:
|
|
res = handler._execute_module(module_name='accelerate', module_args=accelerate_args, task_vars=variables, delete_remote_tmp=False)
|
|
connection._connect()
|
|
|
|
return connection
|
|
|
|
def _get_action_handler(self, connection, templar):
|
|
'''
|
|
Returns the correct action plugin to handle the requestion task action
|
|
'''
|
|
|
|
if self._task.action in self._shared_loader_obj.action_loader:
|
|
if self._task.async != 0:
|
|
raise AnsibleError("async mode is not supported with the %s module" % self._task.action)
|
|
handler_name = self._task.action
|
|
elif self._task.async == 0:
|
|
handler_name = 'normal'
|
|
else:
|
|
handler_name = 'async'
|
|
|
|
handler = self._shared_loader_obj.action_loader.get(
|
|
handler_name,
|
|
task=self._task,
|
|
connection=connection,
|
|
play_context=self._play_context,
|
|
loader=self._loader,
|
|
templar=templar,
|
|
shared_loader_obj=self._shared_loader_obj,
|
|
)
|
|
|
|
if not handler:
|
|
raise AnsibleError("the handler '%s' was not found" % handler_name)
|
|
|
|
return handler
|