docs: def _check_deployed_nodes(nodes):
      """This is borrowed from execo."""
      deployed = []
      undeployed = []
      cmd = "! (mount | grep -E '^/dev/[[:alpha:]]+2 on / ')"
  
      deployed_check = get_execo_remote(
          cmd,
          nodes,
          DEFAULT_CONN_PARAMS)
  
      for p in deployed_check.processes:
          p.nolog_exit_code = True
          p.nolog_timeout = True
          p.nolog_error = True
          p.timeout = 10
      deployed_check.run()
  
      for p in deployed_check.processes:
          if p.ok:
              deployed.append(p.host.address)
          else:
              undeployed.append(p.host.address)
  
      return deployed, undeployed