code: def install_importer():
      
      logging.debug('install_importer')
      if not in_venv():
          logging.debug('No virtualenv active py:[%s]', sys.executable)
          return False
  
      if disable_vext:
          logging.debug('Vext disabled by environment variable')
          return False
  
      if GatekeeperFinder.PATH_TRIGGER not in sys.path:
          try:
              load_specs()
              sys.path.append(GatekeeperFinder.PATH_TRIGGER)
              sys.path_hooks.append(GatekeeperFinder)
          except Exception as e:
              """
              Dont kill other programmes because of a vext error
              """
              logger.info(str(e))
              if logger.getEffectiveLevel() == logging.DEBUG:
                  raise
  
          logging.debug("importer installed")
          return True
docs: If in a virtualenv then load spec files to decide which
      modules can be imported from system site-packages and
      install path hook.