new_contents: # -*- coding: utf-8 -*-
  #
  # Copyright (C) 2017 Edgewall Software
  # All rights reserved.
  #
  # This software is licensed as described in the file COPYING, which
  # you should have received as part of this distribution. The terms
  # are also available at http://trac.edgewall.com/license.html.
  #
  # This software consists of voluntary contributions made by many
  # individuals. For the exact contribution history, see the revision
  # history and logs, available at http://trac.edgewall.org/.
  
  from trac.upgrades import backup_config_file
  from trac.util.text import printout
  from trac.util.translation import _
  
  
  _old_default = ['ReadonlyWikiPolicy', 'DefaultPermissionPolicy',
                  'LegacyAttachmentPolicy']
  _new_default = ['DefaultWikiPolicy', 'DefaultTicketPolicy',
                  'DefaultPermissionPolicy', 'LegacyAttachmentPolicy']
  
  
  def do_upgrade(env, version, cursor):
      """Automatically append DefaultWikiPolicy and DefaultTicketPolicy 
      if permission_policies is the default value. Otherwise, echo a message 
      about the need to manually add DefaultWikiPolicy and DefaultTicketPolicy
      to the list of permission_policies.
      """
  
      policies = env.config.getlist('trac', 'permission_policies')
      if policies == _old_default:
          backup_config_file(env, '.db43.bak')
          env.config.set('trac', 'permission_policies', ', '.join(_new_default))
          env.config.save()
          env.log.info("Enabled DefaultWikiPolicy and DefaultTicketPolicy.")
      else:
          print_upgrade_msg = False
          if 'DefaultWikiPolicy' not in policies:
              env.log.info("DefaultWikiPolicy must be manually enabled.")
              # TRANSLATOR: Wrap message to 80 columns
              printout(_("""\
  Notice: To enable the default permission policy for the *wiki* system,
  trac.ini must be manually edited to add DefaultWikiPolicy to the list
  of permission_policies in the [trac] section.
  """))
              print_upgrade_msg = True
          else:
              env.log.info("DefaultWikiPolicy already enabled.")
          if 'DefaultTicketPolicy' not in policies:
              env.log.info("DefaultTicketPolicy must be manually enabled.")
              # TRANSLATOR: Wrap message to 80 columns
              printout(_("""\
  Notice: To enable the default permission policy for the *ticket* system,
  trac.ini must be manually edited to add DefaultTicketPolicy to the list
  of permission_policies in the [trac] section.
  """))
              print_upgrade_msg = True
          else:
              env.log.info("DefaultTicketPolicy already enabled.")
          if print_upgrade_msg:
              printout(_("""\
  For more details see: http://trac.edgewall.org/wiki/TracUpgrade
              """))
  
subject: Add upgrade script missing from r15749