docs: def populate_with_defaults():
      '''Create user admin and grant him all permission
  
      If the admin user already exists the function will simply return
      '''
      logging.getLogger(__name__).debug("Populating with default users")
      if not User.select().where(User.name == 'admin').exists():
          admin = User.create(name='admin', password='admin')
          admins = Group.create(name='admins')
          starCap = Capability.create(domain='.+',
                                      action=(Action.CREATE |
                                              Action.READ |
                                              Action.UPDATE |
                                              Action.DELETE))
          admins.capabilities.add(starCap)
          admin.groups.add(admins)
          admin.save()
      if not User.select().where(User.name == 'anonymous').exists():
          anon = User.create(name='anonymous', password='')
          anons = Group.create(name='anonymous')
          readCap = Capability.create(domain=Capability.simToReg('/volumes/*'),
                                      action=Action.READ)
          anons.capabilities.add(readCap)
          anon.groups.add(anons)
          anon.save()