code: def git_tracked(demo, file):
      osstdout = subprocess.Popen(
          f"cd {demo} && git ls-files --error-unmatch {file}",
          shell=True,
          stdin=subprocess.PIPE,
          stdout=subprocess.PIPE,
          stderr=subprocess.STDOUT,
          close_fds=True,
      )
      osstdout.wait()
      return not osstdout.returncode
  
imports: import nbformat
  import os
  import json
  import random
  import subprocess
label_desc: Use image node_id 1 for calling a global function with example usage: git_tracked(demo, file) and returns: unknown