code: def _set_ssh_ip_if_required(self):
      if self.ssh_ip is not None:
          return
  
      # We assume that this never changes.
      #   I think that's reasonable.
      deadline = time.time() + AUTOSCALER_NODE_START_WAIT_S
      with LogTimer(self.log_prefix + "Got IP"):
          ip = self._wait_for_ip(deadline)
  
          cli_logger.doassert(
              ip is not None, "Could not get node IP."
          )  # todo: msg
          assert ip is not None, "Unable to find IP of node"
  
      self.ssh_ip = ip
  
      # This should run before any SSH commands and therefore ensure that
      #   the ControlPath directory exists, allowing SSH to maintain
      #   persistent sessions later on.
      try:
          os.makedirs(self.ssh_control_path, mode=0o700, exist_ok=True)
      except OSError as e:
          cli_logger.warning("{}", str(e))
  
imports: import hashlib
  import json
  import logging
  import os
  import subprocess
  import sys
  import time
  from getpass import getuser
  from shlex import quote
  from typing import Dict, List
  import click
  from ray.autoscaler._private.cli_logger import cf, cli_logger
  from ray.autoscaler._private.constants import AUTOSCALER_NODE_SSH_INTERVAL_S, AUTOSCALER_NODE_START_WAIT_S, DEFAULT_OBJECT_STORE_MAX_MEMORY_BYTES, DEFAULT_OBJECT_STORE_MEMORY_PROPORTION
  from ray.autoscaler._private.docker import check_bind_mounts_cmd, check_docker_image, check_docker_running_cmd, docker_start_cmds, with_docker_exec
  from ray.autoscaler._private.log_timer import LogTimer
  from ray.autoscaler._private.subprocess_output_util import ProcessRunnerError, is_output_redirected, run_cmd_redirected
  from ray.autoscaler.command_runner import CommandRunnerInterface
label_desc: Use image node_id 4 for calling the SSHCommandRunner obj's underlying member method code with example usage: obj._set_ssh_ip_if_required() without return types