text: """
  Creates permissions for all installed apps that need permissions.
  """
  from __future__ import unicode_literals
  
  import getpass
  import locale
  import unicodedata
  from django.contrib.auth import models as auth_app
  from django.db.models import get_models, signals
  from django.contrib.auth.models import User
  from django.utils import six
  
  def _get_permission_codename(action, opts):
      return '%s_%s' % (action, opts.object_name.lower())
  
  
  def _get_all_permissions(opts):
      "Returns (codename, name) for all permissions in the given opts."
      perms = []
      for action in ('add', 'change', 'delete'):
          perms.append((_get_permission_codename(action, opts), 'Can %s %s' % (action, opts.verbose_name_raw)))
      return perms + list(opts.permissions)
  
  
  def create_permissions(app, created_models, verbosity, **kwargs):
      from django.contrib.contenttypes.models import ContentType
  
      app_models = get_models(app)
  
      # This will hold the permissions we're looking for as
      # (content_type, (codename, name))
      searched_perms = list()
      # The codenames and ctypes that should exist.
      ctypes = set()
      for klass in app_models:
          ctype = ContentType.objects.get_for_model(klass)
          ctypes.add(ctype)
          for perm in _get_all_permissions(klass._meta):
              searched_perms.append((ctype, perm))
  
      # Find all the Permissions that have a context_type for a model we're
      # looking for.  We don't need to check for codenames since we already have
      # a list of the ones we're going to create.
      all_perms = set(auth_app.Permission.objects.filter(
          content_type__in=ctypes,
      ).values_list(
          "content_type", "codename"
      ))
  
      objs = [
          auth_app.Permission(codename=codename, name=name, content_type=ctype)
          for ctype, (codename, name) in searched_perms
          if (ctype.pk, codename) not in all_perms
      ]
      auth_app.Permission.objects.bulk_create(objs)
      if verbosity >= 2:
          for obj in objs:
              print("Adding permission '%s'" % obj)
  
  
  def create_superuser(app, created_models, verbosity, db, **kwargs):
      from django.core.management import call_command
  
      if auth_app.User in created_models and kwargs.get('interactive', True):
          msg = ("\nYou just installed Django's auth system, which means you "
              "don't have any superusers defined.\nWould you like to create one "
              "now? (yes/no): ")
          confirm = six.raw_input(msg)
          while 1:
              if confirm not in ('yes', 'no'):
                  confirm = six.raw_input('Please enter either "yes" or "no": ')
                  continue
              if confirm == 'yes':
                  call_command("createsuperuser", interactive=True, database=db)
              break
  
  
  def get_system_username():
      """
      Try to determine the current system user's username.
  
      :returns: The username as a unicode string, or an empty string if the
          username could not be determined.
      """
      if six.PY3:
          return getpass.getuser()
      try:
          return getpass.getuser().decode(locale.getdefaultlocale()[1])
      except (ImportError, KeyError, UnicodeDecodeError):
          # KeyError will be raised by os.getpwuid() (called by getuser())
          # if there is no corresponding entry in the /etc/passwd file
          # (a very restricted chroot environment, for example).
          # UnicodeDecodeError - preventive treatment for non-latin Windows.
          return ''
  
  
  def get_default_username(check_db=True):
      """
      Try to determine the current system user's username to use as a default.
  
      :param check_db: If ``True``, requires that the username does not match an
          existing ``auth.User`` (otherwise returns an empty string).
      :returns: The username, or an empty string if no username can be
          determined.
      """
      from django.contrib.auth.management.commands.createsuperuser import (
          RE_VALID_USERNAME)
      default_username = get_system_username()
      try:
          default_username = unicodedata.normalize('NFKD', default_username)\
              .encode('ascii', 'ignore').decode('ascii', 'ignore')\
              .replace(' ', '').lower()
      except UnicodeDecodeError:
          return ''
      if not RE_VALID_USERNAME.match(default_username):
          return ''
      # Don't return the default username if it is already taken.
      if check_db and default_username:
          try:
              User.objects.get(username=default_username)
          except User.DoesNotExist:
              pass
          else:
              return ''
      return default_username
  
  
  signals.post_syncdb.connect(create_permissions,
      dispatch_uid = "django.contrib.auth.management.create_permissions")
  signals.post_syncdb.connect(create_superuser,
      sender=auth_app, dispatch_uid = "django.contrib.auth.management.create_superuser")
  