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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_cromwell_execution_dir(base_dir, target_glob):
 """Retrieve the baseline directory with cromwell output files. Handles Cromwell restarts where there are multiple work directories and we traverse symlinks back to the original. """

    cur_dir = glob.glob(os.path.join(base_dir, target_glob))[0]
    if os.path.exists(os.path.join(cur_dir, "cwl.output.json")):
        return base_dir
    else:
        symlink_dir = os.path.dirname(os.path.realpath(os.path.join(cur_dir, "script")))
        ref_base = os.path.dirname(base_dir)
        new_guid = symlink_dir[symlink_dir.find(ref_base) + len(ref_base) + 1:].split("/")[0]
        return _get_cromwell_execution_dir(os.path.join(ref_base, new_guid), target_glob)