code: def SpawnProcess(popen_args, passwd=None):
    
    if passwd is not None:
      # We send the password via pipe to avoid creating a process with the
      # password as an argument that will get logged on some systems.
      p = subprocess.Popen(popen_args, stdin=subprocess.PIPE)
      p.communicate(input=passwd)
    else:
      p = subprocess.Popen(popen_args)
      p.wait()
    if p.returncode != 0:
      raise ErrorDuringRepacking(" ".join(popen_args))
docs: Spawns a process.