code: def _find_grail_rc(self):
      import glob
      import pwd
      import socket
      import tempfile
  
      tempdir = os.path.join(tempfile.gettempdir(), ".grail-unix")
      user = pwd.getpwuid(os.getuid())[0]
      filename = os.path.join(
          glob.escape(tempdir), glob.escape(user) + "-*"
      )
      maybes = glob.glob(filename)
      if not maybes:
          return None
      s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
      for fn in maybes:
          # need to PING each one until we find one that's live
          try:
              s.connect(fn)
          except OSError:
              # no good; attempt to clean it out, but don't fail:
              try:
                  os.unlink(fn)
              except OSError:
                  pass
          else:
              return s
  
imports: import os
  import shlex
  import shutil
  import sys
  import subprocess
  import threading
  import warnings
label_desc: Use image node_id 1 for calling the Grail obj's underlying member method code with example usage: obj._find_grail_rc() and returns: None, s