code: def tweak(environment, opts):
      
  
      environment.require_data()
      if opts['--install-postgis']:
          print "Installing postgis"
          environment.install_postgis_sql()
      if opts['--add-redis']:
          # Let the user know if they are trying to add it and it is already there
          print ('Adding redis extra container... Please note that you will have '
              'to reload your environment for these changes to take effect ("datacats reload {}")'
              .format(environment.name))
          environment.add_extra_container('redis', error_on_exists=True)
      if opts['--admin-password']:
          environment.create_admin_set_password(confirm_password())
docs: Commands operating on environment data
  
  Usage:
    datacats tweak --install-postgis [ENVIRONMENT]
    datacats tweak --add-redis [ENVIRONMENT]
    datacats tweak --admin-password [ENVIRONMENT]
  
  Options:
    --install-postgis    Install postgis in ckan database
    --add-redis          Adds redis next time this environment reloads
    -s --site=NAME       Choose a site to tweak [default: primary]
    -p --admin-password  Prompt to change the admin password
  
  ENVIRONMENT may be an environment name or a path to an environment directory.
  
  Default: '.'