code: def getWorkflowDir(workflowID, configWorkDir=None):
          
          workDir = configWorkDir or os.getenv('TOIL_WORKDIR') or tempfile.gettempdir()
          if not os.path.exists(workDir):
              raise RuntimeError("The directory specified by --workDir or TOIL_WORKDIR (%s) does not "
                                 "exist." % workDir)
          # Create the workflow dir, make it unique to each host in case workDir is on a shared FS.
          # This prevents workers on different nodes from erasing each other's directories.
          workflowDir = os.path.join(workDir, 'toil-%s-%s' % (workflowID, getNodeID()))
          try:
              # Directory creation is atomic
              os.mkdir(workflowDir)
          except OSError as err:
              if err.errno != 17:
                  # The directory exists if a previous worker set it up.
                  raise
          else:
              logger.debug('Created the workflow directory at %s' % workflowDir)
          return workflowDir
docs: Returns a path to the directory where worker directories and the cache will be located
          for this workflow.
  
          :param str workflowID: Unique identifier for the workflow
          :param str configWorkDir: Value passed to the program using the --workDir flag
          :return: Path to the workflow directory
          :rtype: str