code: def test_start_from_read_only_snapshot():
      """
      Validates if we can start and restore Torchserve state using a read-only snapshot.
      """
      snapshot_cfg = glob.glob("logs/config/*snap*.cfg")[0]
      file_status = os.stat(snapshot_cfg)
      os.chmod(snapshot_cfg, 0o444)
      test_utils.start_torchserve(snapshot_file=snapshot_cfg)
      os.chmod(snapshot_cfg, (file_status.st_mode & 0o777))
      try:
          response = requests.get("http://127.0.0.1:8081/models/")
      except:
          assert (
              False
          ), "Something is not right!! Failed to start Torchserve using Read Only Snapshot!!"
      else:
          assert (
              True
          ), "Successfully started and restored Torchserve state using a Read Only Snapshot"
  
imports: import platform
  import time
  import os
  import glob
  import requests
  import json
  import test_utils
label_desc: Use image node_id 9 for calling a global function with example usage: test_start_from_read_only_snapshot() without return types