608 lines
27 KiB
Python
608 lines
27 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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from ansible.compat.six.moves import queue as Queue
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from ansible.compat.six import iteritems, text_type, string_types
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import time
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from jinja2.exceptions import UndefinedError
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from ansible import constants as C
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from ansible.errors import AnsibleError, AnsibleParserError, AnsibleUndefinedVariable
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from ansible.executor.task_result import TaskResult
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from ansible.inventory.host import Host
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from ansible.inventory.group import Group
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from ansible.playbook.handler import Handler
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from ansible.playbook.helpers import load_list_of_blocks
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from ansible.playbook.included_file import IncludedFile
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from ansible.playbook.role import hash_params
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from ansible.plugins import action_loader, connection_loader, filter_loader, lookup_loader, module_loader, test_loader
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from ansible.template import Templar
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from ansible.vars.unsafe_proxy import 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__ = ['StrategyBase']
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# TODO: this should probably be in the plugins/__init__.py, with
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# a smarter mechanism to set all of the attributes based on
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# the loaders created there
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class SharedPluginLoaderObj:
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'''
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A simple object to make pass the various plugin loaders to
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the forked processes over the queue easier
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'''
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def __init__(self):
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self.action_loader = action_loader
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self.connection_loader = connection_loader
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self.filter_loader = filter_loader
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self.test_loader = test_loader
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self.lookup_loader = lookup_loader
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self.module_loader = module_loader
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class StrategyBase:
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'''
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This is the base class for strategy plugins, which contains some common
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code useful to all strategies like running handlers, cleanup actions, etc.
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'''
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def __init__(self, tqm):
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self._tqm = tqm
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self._inventory = tqm.get_inventory()
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self._workers = tqm.get_workers()
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self._notified_handlers = tqm.get_notified_handlers()
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self._variable_manager = tqm.get_variable_manager()
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self._loader = tqm.get_loader()
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self._final_q = tqm._final_q
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self._step = getattr(tqm._options, 'step', False)
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self._diff = getattr(tqm._options, 'diff', False)
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self._display = display
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# internal counters
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self._pending_results = 0
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self._cur_worker = 0
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# this dictionary is used to keep track of hosts that have
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# outstanding tasks still in queue
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self._blocked_hosts = dict()
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def run(self, iterator, play_context, result=True):
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# save the failed/unreachable hosts, as the run_handlers()
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# method will clear that information during its execution
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failed_hosts = self._tqm._failed_hosts.keys()
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unreachable_hosts = self._tqm._unreachable_hosts.keys()
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self._display.debug("running handlers")
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result &= self.run_handlers(iterator, play_context)
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# now update with the hosts (if any) that failed or were
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# unreachable during the handler execution phase
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failed_hosts = set(failed_hosts).union(self._tqm._failed_hosts.keys())
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unreachable_hosts = set(unreachable_hosts).union(self._tqm._unreachable_hosts.keys())
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# send the stats callback
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self._tqm.send_callback('v2_playbook_on_stats', self._tqm._stats)
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if len(unreachable_hosts) > 0:
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return 3
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elif len(failed_hosts) > 0:
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return 2
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elif not result:
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return 1
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else:
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return 0
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def get_hosts_remaining(self, play):
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return [host for host in self._inventory.get_hosts(play.hosts) if host.name not in self._tqm._failed_hosts and host.name not in self._tqm._unreachable_hosts]
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def get_failed_hosts(self, play):
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return [host for host in self._inventory.get_hosts(play.hosts) if host.name in self._tqm._failed_hosts]
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def add_tqm_variables(self, vars, play):
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'''
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Base class method to add extra variables/information to the list of task
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vars sent through the executor engine regarding the task queue manager state.
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'''
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new_vars = vars.copy()
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new_vars['ansible_current_hosts'] = self.get_hosts_remaining(play)
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new_vars['ansible_failed_hosts'] = self.get_failed_hosts(play)
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return new_vars
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def _queue_task(self, host, task, task_vars, play_context):
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''' handles queueing the task up to be sent to a worker '''
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self._display.debug("entering _queue_task() for %s/%s" % (host, task))
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# and then queue the new task
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self._display.debug("%s - putting task (%s) in queue" % (host, task))
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try:
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self._display.debug("worker is %d (out of %d available)" % (self._cur_worker+1, len(self._workers)))
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(worker_prc, main_q, rslt_q) = self._workers[self._cur_worker]
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self._cur_worker += 1
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if self._cur_worker >= len(self._workers):
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self._cur_worker = 0
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# create a dummy object with plugin loaders set as an easier
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# way to share them with the forked processes
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shared_loader_obj = SharedPluginLoaderObj()
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main_q.put((host, task, self._loader.get_basedir(), task_vars, play_context, shared_loader_obj), block=False)
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self._pending_results += 1
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except (EOFError, IOError, AssertionError) as e:
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# most likely an abort
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self._display.debug("got an error while queuing: %s" % e)
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return
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self._display.debug("exiting _queue_task() for %s/%s" % (host, task))
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def _process_pending_results(self, iterator):
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'''
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Reads results off the final queue and takes appropriate action
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based on the result (executing callbacks, updating state, etc.).
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'''
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ret_results = []
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while not self._final_q.empty() and not self._tqm._terminated:
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try:
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result = self._final_q.get(block=False)
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self._display.debug("got result from result worker: %s" % ([text_type(x) for x in result],))
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# all host status messages contain 2 entries: (msg, task_result)
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if result[0] in ('host_task_ok', 'host_task_failed', 'host_task_skipped', 'host_unreachable'):
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task_result = result[1]
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host = task_result._host
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task = task_result._task
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if result[0] == 'host_task_failed' or task_result.is_failed():
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if not task.ignore_errors:
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self._display.debug("marking %s as failed" % host.name)
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if task.run_once:
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# if we're using run_once, we have to fail every host here
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[iterator.mark_host_failed(h) for h in self._inventory.get_hosts(iterator._play.hosts) if h.name not in self._tqm._unreachable_hosts]
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else:
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iterator.mark_host_failed(host)
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self._tqm._failed_hosts[host.name] = True
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self._tqm._stats.increment('failures', host.name)
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else:
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self._tqm._stats.increment('ok', host.name)
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self._tqm.send_callback('v2_runner_on_failed', task_result, ignore_errors=task.ignore_errors)
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elif result[0] == 'host_unreachable':
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self._tqm._unreachable_hosts[host.name] = True
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self._tqm._stats.increment('dark', host.name)
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self._tqm.send_callback('v2_runner_on_unreachable', task_result)
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elif result[0] == 'host_task_skipped':
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self._tqm._stats.increment('skipped', host.name)
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self._tqm.send_callback('v2_runner_on_skipped', task_result)
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elif result[0] == 'host_task_ok':
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if task.action != 'include':
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self._tqm._stats.increment('ok', host.name)
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if 'changed' in task_result._result and task_result._result['changed']:
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self._tqm._stats.increment('changed', host.name)
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self._tqm.send_callback('v2_runner_on_ok', task_result)
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if self._diff and 'diff' in task_result._result:
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self._tqm.send_callback('v2_on_file_diff', task_result)
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self._pending_results -= 1
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if host.name in self._blocked_hosts:
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del self._blocked_hosts[host.name]
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# If this is a role task, mark the parent role as being run (if
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# the task was ok or failed, but not skipped or unreachable)
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if task_result._task._role is not None and result[0] in ('host_task_ok', 'host_task_failed'):
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# lookup the role in the ROLE_CACHE to make sure we're dealing
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# with the correct object and mark it as executed
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for (entry, role_obj) in iteritems(iterator._play.ROLE_CACHE[task_result._task._role._role_name]):
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if role_obj._uuid == task_result._task._role._uuid:
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role_obj._had_task_run[host.name] = True
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ret_results.append(task_result)
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elif result[0] == 'add_host':
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result_item = result[1]
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new_host_info = result_item.get('add_host', dict())
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self._add_host(new_host_info, iterator)
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elif result[0] == 'add_group':
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host = result[1]
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result_item = result[2]
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self._add_group(host, result_item)
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elif result[0] == 'notify_handler':
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task_result = result[1]
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handler_name = result[2]
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original_task = iterator.get_original_task(task_result._host, task_result._task)
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if handler_name not in self._notified_handlers:
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self._notified_handlers[handler_name] = []
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if task_result._host not in self._notified_handlers[handler_name]:
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self._notified_handlers[handler_name].append(task_result._host)
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self._display.vv("NOTIFIED HANDLER %s" % (handler_name,))
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elif result[0] == 'register_host_var':
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# essentially the same as 'set_host_var' below, however we
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# never follow the delegate_to value for registered vars and
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# the variable goes in the fact_cache
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host = result[1]
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var_name = result[2]
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var_value = wrap_var(result[3])
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self._variable_manager.set_nonpersistent_facts(host, {var_name: var_value})
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elif result[0] in ('set_host_var', 'set_host_facts'):
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host = result[1]
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task = result[2]
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item = result[3]
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if task.delegate_to is not None:
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task_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, host=host, task=task)
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task_vars = self.add_tqm_variables(task_vars, play=iterator._play)
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if item is not None:
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task_vars['item'] = item
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templar = Templar(loader=self._loader, variables=task_vars)
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host_name = templar.template(task.delegate_to)
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target_host = self._inventory.get_host(host_name)
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if target_host is None:
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target_host = Host(name=host_name)
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else:
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target_host = host
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if result[0] == 'set_host_var':
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var_name = result[4]
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var_value = result[5]
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self._variable_manager.set_host_variable(target_host, var_name, var_value)
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elif result[0] == 'set_host_facts':
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facts = result[4]
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if task.action == 'set_fact':
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self._variable_manager.set_nonpersistent_facts(target_host, facts)
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else:
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self._variable_manager.set_host_facts(target_host, facts)
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else:
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raise AnsibleError("unknown result message received: %s" % result[0])
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except Queue.Empty:
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pass
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return ret_results
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def _wait_on_pending_results(self, iterator):
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'''
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Wait for the shared counter to drop to zero, using a short sleep
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between checks to ensure we don't spin lock
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'''
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ret_results = []
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self._display.debug("waiting for pending results...")
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while self._pending_results > 0 and not self._tqm._terminated:
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results = self._process_pending_results(iterator)
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ret_results.extend(results)
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time.sleep(0.01)
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self._display.debug("no more pending results, returning what we have")
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return ret_results
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def _add_host(self, host_info, iterator):
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'''
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Helper function to add a new host to inventory based on a task result.
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'''
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host_name = host_info.get('host_name')
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# Check if host in cache, add if not
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if host_name in self._inventory._hosts_cache:
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new_host = self._inventory._hosts_cache[host_name]
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else:
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new_host = Host(name=host_name)
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self._inventory._hosts_cache[host_name] = new_host
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allgroup = self._inventory.get_group('all')
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allgroup.add_host(new_host)
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# Set/update the vars for this host
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new_vars = host_info.get('host_vars', dict())
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new_host.vars = self._inventory.get_host_vars(new_host)
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new_host.vars.update(new_vars)
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new_groups = host_info.get('groups', [])
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for group_name in new_groups:
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if not self._inventory.get_group(group_name):
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new_group = Group(group_name)
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self._inventory.add_group(new_group)
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new_group.vars = self._inventory.get_group_variables(group_name)
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else:
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new_group = self._inventory.get_group(group_name)
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new_group.add_host(new_host)
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# add this host to the group cache
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if self._inventory.groups is not None:
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if group_name in self._inventory.groups:
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if new_host not in self._inventory.get_group(group_name).hosts:
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self._inventory.get_group(group_name).hosts.append(new_host.name)
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# clear pattern caching completely since it's unpredictable what
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# patterns may have referenced the group
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self._inventory.clear_pattern_cache()
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# also clear the hostvar cache entry for the given play, so that
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# the new hosts are available if hostvars are referenced
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self._variable_manager.invalidate_hostvars_cache(play=iterator._play)
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def _add_group(self, host, result_item):
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'''
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Helper function to add a group (if it does not exist), and to assign the
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specified host to that group.
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'''
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changed = False
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# the host here is from the executor side, which means it was a
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# serialized/cloned copy and we'll need to look up the proper
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# host object from the master inventory
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real_host = self._inventory.get_host(host.name)
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group_name = result_item.get('add_group')
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new_group = self._inventory.get_group(group_name)
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if not new_group:
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# create the new group and add it to inventory
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new_group = Group(name=group_name)
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self._inventory.add_group(new_group)
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new_group.vars = self._inventory.get_group_vars(new_group)
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# and add the group to the proper hierarchy
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allgroup = self._inventory.get_group('all')
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allgroup.add_child_group(new_group)
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changed = True
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if group_name not in host.get_groups():
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new_group.add_host(real_host)
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changed = True
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return changed
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def _load_included_file(self, included_file, iterator, is_handler=False):
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'''
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Loads an included YAML file of tasks, applying the optional set of variables.
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'''
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try:
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data = self._loader.load_from_file(included_file._filename)
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if data is None:
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return []
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elif not isinstance(data, list):
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raise AnsibleError("included task files must contain a list of tasks")
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block_list = load_list_of_blocks(
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data,
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play=included_file._task._block._play,
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parent_block=included_file._task._block,
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task_include=included_file._task,
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role=included_file._task._role,
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use_handlers=is_handler,
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loader=self._loader
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)
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# since we skip incrementing the stats when the task result is
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# first processed, we do so now for each host in the list
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for host in included_file._hosts:
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self._tqm._stats.increment('ok', host.name)
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except AnsibleError as e:
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# mark all of the hosts including this file as failed, send callbacks,
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# and increment the stats for this host
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for host in included_file._hosts:
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tr = TaskResult(host=host, task=included_file._task, return_data=dict(failed=True, reason=str(e)))
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iterator.mark_host_failed(host)
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self._tqm._failed_hosts[host.name] = True
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self._tqm._stats.increment('failures', host.name)
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self._tqm.send_callback('v2_runner_on_failed', tr)
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return []
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# set the vars for this task from those specified as params to the include
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for b in block_list:
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# first make a copy of the including task, so that each has a unique copy to modify
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# FIXME: not sure if this is the best way to fix this, as we might be losing
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# information in the copy. Previously we assigned the include params to
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# the block variables directly, which caused other problems, so we may
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# need to figure out a third option if this also presents problems.
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b._task_include = b._task_include.copy(exclude_block=True)
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# then we create a temporary set of vars to ensure the variable reference is unique
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temp_vars = b._task_include.vars.copy()
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temp_vars.update(included_file._args.copy())
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# pop tags out of the include args, if they were specified there, and assign
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# them to the include. If the include already had tags specified, we raise an
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# error so that users know not to specify them both ways
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tags = temp_vars.pop('tags', [])
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if isinstance(tags, string_types):
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tags = [ tags ]
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if len(tags) > 0:
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if len(b._task_include.tags) > 0:
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raise AnsibleParserError("Include tasks should not specify tags in more than one way (both via args and directly on the task)", obj=included_file._task._ds)
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self._display.deprecated("You should not specify tags in the include parameters. All tags should be specified using the task-level option")
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b._task_include.tags = tags
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b._task_include.vars = temp_vars
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# finally, send the callback and return the list of blocks loaded
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self._tqm.send_callback('v2_playbook_on_include', included_file)
|
|
return block_list
|
|
|
|
def run_handlers(self, iterator, play_context):
|
|
'''
|
|
Runs handlers on those hosts which have been notified.
|
|
'''
|
|
|
|
result = True
|
|
|
|
for handler_block in iterator._play.handlers:
|
|
# FIXME: handlers need to support the rescue/always portions of blocks too,
|
|
# but this may take some work in the iterator and gets tricky when
|
|
# we consider the ability of meta tasks to flush handlers
|
|
for handler in handler_block.block:
|
|
handler_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, task=handler)
|
|
templar = Templar(loader=self._loader, variables=handler_vars)
|
|
try:
|
|
# first we check with the full result of get_name(), which may
|
|
# include the role name (if the handler is from a role). If that
|
|
# is not found, we resort to the simple name field, which doesn't
|
|
# have anything extra added to it.
|
|
handler_name = templar.template(handler.name)
|
|
if handler_name not in self._notified_handlers:
|
|
handler_name = templar.template(handler.get_name())
|
|
except (UndefinedError, AnsibleUndefinedVariable):
|
|
# We skip this handler due to the fact that it may be using
|
|
# a variable in the name that was conditionally included via
|
|
# set_fact or some other method, and we don't want to error
|
|
# out unnecessarily
|
|
continue
|
|
|
|
if handler_name in self._notified_handlers and len(self._notified_handlers[handler_name]):
|
|
result = self._do_handler_run(handler, handler_name, iterator=iterator, play_context=play_context)
|
|
if not result:
|
|
break
|
|
return result
|
|
|
|
def _do_handler_run(self, handler, handler_name, iterator, play_context, notified_hosts=None):
|
|
|
|
# FIXME: need to use iterator.get_failed_hosts() instead?
|
|
#if not len(self.get_hosts_remaining(iterator._play)):
|
|
# self._tqm.send_callback('v2_playbook_on_no_hosts_remaining')
|
|
# result = False
|
|
# break
|
|
self._tqm.send_callback('v2_playbook_on_handler_task_start', handler)
|
|
|
|
if notified_hosts is None:
|
|
notified_hosts = self._notified_handlers[handler_name]
|
|
|
|
run_once = False
|
|
try:
|
|
action = action_loader.get(handler.action, class_only=True)
|
|
if handler.run_once or getattr(action, 'BYPASS_HOST_LOOP', False):
|
|
run_once = True
|
|
except KeyError:
|
|
# we don't care here, because the action may simply not have a
|
|
# corresponding action plugin
|
|
pass
|
|
|
|
host_results = []
|
|
for host in notified_hosts:
|
|
if not handler.has_triggered(host) and (host.name not in self._tqm._failed_hosts or play_context.force_handlers):
|
|
task_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, host=host, task=handler)
|
|
task_vars = self.add_tqm_variables(task_vars, play=iterator._play)
|
|
self._queue_task(host, handler, task_vars, play_context)
|
|
if run_once:
|
|
break
|
|
|
|
# collect the results from the handler run
|
|
host_results = self._wait_on_pending_results(iterator)
|
|
|
|
try:
|
|
included_files = IncludedFile.process_include_results(
|
|
host_results,
|
|
self._tqm,
|
|
iterator=iterator,
|
|
loader=self._loader,
|
|
variable_manager=self._variable_manager
|
|
)
|
|
except AnsibleError as e:
|
|
return False
|
|
|
|
result = True
|
|
if len(included_files) > 0:
|
|
for included_file in included_files:
|
|
try:
|
|
new_blocks = self._load_included_file(included_file, iterator=iterator, is_handler=True)
|
|
# for every task in each block brought in by the include, add the list
|
|
# of hosts which included the file to the notified_handlers dict
|
|
for block in new_blocks:
|
|
iterator._play.handlers.append(block)
|
|
for task in block.block:
|
|
result = self._do_handler_run(
|
|
handler=task,
|
|
iterator=iterator,
|
|
play_context=play_context,
|
|
notified_hosts=included_file._hosts[:],
|
|
)
|
|
if not result:
|
|
break
|
|
except AnsibleError as e:
|
|
for host in included_file._hosts:
|
|
iterator.mark_host_failed(host)
|
|
self._tqm._failed_hosts[host.name] = True
|
|
self._display.warning(str(e))
|
|
continue
|
|
|
|
# wipe the notification list
|
|
self._notified_handlers[handler_name] = []
|
|
self._display.debug("done running handlers, result is: %s" % result)
|
|
return result
|
|
|
|
def _take_step(self, task, host=None):
|
|
|
|
ret=False
|
|
if host:
|
|
msg = u'Perform task: %s on %s (y/n/c): ' % (task, host)
|
|
else:
|
|
msg = u'Perform task: %s (y/n/c): ' % task
|
|
resp = self._display.prompt(msg)
|
|
|
|
if resp.lower() in ['y','yes']:
|
|
self._display.debug("User ran task")
|
|
ret = True
|
|
elif resp.lower() in ['c', 'continue']:
|
|
self._display.debug("User ran task and cancled step mode")
|
|
self._step = False
|
|
ret = True
|
|
else:
|
|
self._display.debug("User skipped task")
|
|
|
|
self._display.banner(msg)
|
|
|
|
return ret
|
|
|
|
def _execute_meta(self, task, play_context, iterator):
|
|
|
|
# meta tasks store their args in the _raw_params field of args,
|
|
# since they do not use k=v pairs, so get that
|
|
meta_action = task.args.get('_raw_params')
|
|
|
|
if meta_action == 'noop':
|
|
# FIXME: issue a callback for the noop here?
|
|
pass
|
|
elif meta_action == 'flush_handlers':
|
|
self.run_handlers(iterator, play_context)
|
|
elif meta_action == 'refresh_inventory':
|
|
self._inventory.refresh_inventory()
|
|
#elif meta_action == 'reset_connection':
|
|
# connection_info.connection.close()
|
|
else:
|
|
raise AnsibleError("invalid meta action requested: %s" % meta_action, obj=task._ds)
|