code: def DumpClientYaml(client_urn, target_dir, token=None, overwrite=False):
    
    fd = aff4.FACTORY.Open(client_urn, aff4_grr.VFSGRRClient, token=token)
    dirpath = os.path.join(target_dir, fd.urn.Split()[0])
    try:
      # Due to threading this can actually be created by another thread.
      os.makedirs(dirpath)
    except OSError:
      pass
    filepath = os.path.join(dirpath, "client_info.yaml")
    if not os.path.isfile(filepath) or overwrite:
      with open(filepath, "wb") as out_file:
        out_file.write(serialize.YamlDumper(fd))
docs: Dump a yaml file containing client info.