code: def clear_repository_helper(reserve_fn, clear_fn, retry=5, reservation=None):
      
  
      if reservation is None:
          reservation = reserve_fn()
  
      # start erasure
      reservation = _clear_repository(reserve_fn, clear_fn,
                                      INITIATE_ERASE, retry, reservation)
  
      # give some time to clear
      time.sleep(0.5)
  
      # wait until finish
      reservation = _clear_repository(reserve_fn, clear_fn,
                                      GET_ERASE_STATUS, retry, reservation)
docs: Helper function to start repository erasure and wait until finish.
      This helper is used by clear_sel and clear_sdr_repository.