text: # Copyright 2012, Dag Wieers <dag@wieers.com>
  #
  # This file is part of Ansible
  #
  # Ansible is free software: you can redistribute it and/or modify
  # it under the terms of the GNU General Public License as published by
  # the Free Software Foundation, either version 3 of the License, or
  # (at your option) any later version.
  #
  # Ansible is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
  from __future__ import (absolute_import, division, print_function)
  __metaclass__ = type
  
  from ansible.errors import AnsibleError
  from ansible.playbook.conditional import Conditional
  from ansible.plugins.action import ActionBase
  from ansible.module_utils.six import string_types
  
  
  class ActionModule(ActionBase):
      ''' Fail with custom message '''
  
      TRANSFERS_FILES = False
      _VALID_ARGS = frozenset(('fail_msg', 'msg', 'that'))
  
      def run(self, tmp=None, task_vars=None):
          if task_vars is None:
              task_vars = dict()
  
          result = super(ActionModule, self).run(tmp, task_vars)
          del tmp  # tmp no longer has any effect
  
          if 'that' not in self._task.args:
              raise AnsibleError('conditional required in "that" string')
  
          fail_msg = None
          success_msg = None
  
          fail_msg = self._task.args.get('fail_msg', self._task.args.get('msg'))
          if fail_msg is None:
              fail_msg = 'Assertion failed'
          elif not isinstance(fail_msg, string_types):
              raise AnsibleError('Incorrect type for fail_msg or msg, expected string and got %s' % type(fail_msg))
  
          success_msg = self._task.args.get('success_msg')
          if success_msg is None:
              success_msg = 'All assertions passed'
          elif not isinstance(success_msg, string_types):
              raise AnsibleError('Incorrect type for success_msg, expected string and got %s' % type(success_msg))
  
          # make sure the 'that' items are a list
          thats = self._task.args['that']
          if not isinstance(thats, list):
              thats = [thats]
  
          # Now we iterate over the that items, temporarily assigning them
          # to the task's when value so we can evaluate the conditional using
          # the built in evaluate function. The when has already been evaluated
          # by this point, and is not used again, so we don't care about mangling
          # that value now
          cond = Conditional(loader=self._loader)
          result['_ansible_verbose_always'] = True
          for that in thats:
              cond.when = [that]
              test_result = cond.evaluate_conditional(templar=self._templar, all_vars=task_vars)
              if not test_result:
                  result['failed'] = True
                  result['evaluated_to'] = test_result
                  result['assertion'] = that
  
                  result['msg'] = fail_msg
  
                  return result
  
          result['changed'] = False
          result['msg'] = success_msg
          return result
  