系统更新
            这些命令用于管理系统更新映射。
            
                表 13-3  更新命令
                
                | 
                    
                    
                    
                    
                        
                            |  |  |  |  
                            | GET | /updates | 列出所有系统更新 |  
                            | GET | /updates/<update> | 获取指定的系统更新属性 |  
                            | GET | /updates-firmware | 列出其余待升级组件、最后一次尝试时间、以及这些组件的当前状态 |  
                            | PUT | /updates/<update> | 修改更新设置 |  
                            | PUT | /updates/<update>/upgrade | 升级到指定的更新映射 |  
                            | PUT | /updates/<update>/check | 对指定的更新映射执行升级运行状况检查 |  
                            | PUT | /updates/<update>/rollback | 回滚到指定的更新映射 |  
                            | PUT | /updates-apply | 应用不兼容的延迟更新 |  
                            | DELETE | /updates/<update> | 销毁指定的系统更新 |  
                            | POST | /updates | 将更新映射加载到设备上 |  | 
            
            
                表 13-4  系统更新属性
                
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                            |  |  |  |  
                            | version | 字符串 | 更新介质版本 |  
                            | date | DateTime | 更改发行日期 |  
                            | status | 字符串 | 更新介质状态(不可变) |  
                            | update_deferred | ChooseOne | 延迟设置 ["onreboot"、"onrequest"] |  | 
            
            延迟更新通知:
            The following updates enable features that are incompatible with earlier
software versions. As these updates cannot be reverted once committed, and
peer system resources are updated across a cluster, verifying first that the
system upgrade is functioning properly before applying deferred updates is
advised.