docs: def _get_source_device_path(self, fcp, target_wwpn, target_lun):
          """rhel"""
          device = '0.0.%s' % fcp
          data = {'device': device, 'wwpn': target_wwpn, 'lun': target_lun}
          var_source_device = ('SourceDevice="/dev/disk/by-path/ccw-%(device)s-'
                               'zfcp-%(wwpn)s:%(lun)s"\n' % data)
          return var_source_device