code: def get_username():
      """
      Utility function to retrieve the current username
      """
      if os.environ.get("LOGNAME"):
          return os.environ.get("LOGNAME")
      if os.environ.get("LNAME"):
          return os.environ.get("LNAME")
      if os.environ.get("USER"):
          return os.environ.get("USER")
      if os.environ.get("USERNAME"):
          return os.environ.get("USERNAME")
  
      return None
  
file_path: aim/aim/ext/sshfs/utils.py
imports: import os
  import platform
  import shutil
  import subprocess
  import time
  import logging
  from typing import Optional, Tuple
label_desc: Use image node_id 1 for calling a global function with example usage: get_username() and returns: None, os, os, os, os