new_contents: # (c) 2015, Alejandro Guirao <lekumberri@gmail.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/>.
  
  import shelve
  import os
  from ansible import utils, errors
  
  class LookupModule(object):
  
      def __init__(self, basedir=None, **kwargs):
          self.basedir = basedir
  
      def read_shelve(self, shelve_filename, key):
          """
          Read the value of "key" from a shelve file
          """
          d = shelve.open(shelve_filename)
          res = d.get(key, None)
          d.close()
          return res
  
      def run(self, terms, inject=None, **kwargs):
  
          terms = utils.listify_lookup_plugin_terms(terms, self.basedir, inject)
          ret = []
  
          if not isinstance(terms, list):
              terms = [ terms ]
  
          for term in terms:
              playbook_path = None
              relative_path = None
              paramvals = {"file": None, "key": None}
              params = term.split()
  
              try:
                  for param in params:
                      name, value = param.split('=')
                      assert(name in paramvals)
                      paramvals[name] = value
  
              except (ValueError, AssertionError), e:
                  # In case "file" or "key" are not present
                  raise errors.AnsibleError(e)
  
              file = paramvals['file']
              key = paramvals['key']
              basedir_path  = utils.path_dwim(self.basedir, file)
  
              # Search also in the role/files directory and in the playbook directory
              if '_original_file' in inject:
                  relative_path = utils.path_dwim_relative(inject['_original_file'], 'files', file, self.basedir, check=False)
              if 'playbook_dir' in inject:
                  playbook_path = os.path.join(inject['playbook_dir'], file)
  
              for path in (basedir_path, relative_path, playbook_path):
                  if path and os.path.exists(path):
                      res = self.read_shelve(path, key)
                      if res is None:
                          raise errors.AnsibleError("Key %s not found in shelve file %s" % (key, file))
                      # Convert the value read to string
                      ret.append(str(res))
                      break
              else:
                  raise errors.AnsibleError("Could not locate shelve file in lookup: %s" % file)
  
          return ret
  
subject: Add shelvefile lookup plugin