git discard when composer update

当在项目中执行composer update或install时，如果本地子包出现修改，会出现如下提示，

Updating yk/laravel-device-operation dev-master (72ca476 => 862b337):     The package has modified files:
    M app/ServiceProvider.php
    Discard changes [y,n,v,d,s,?]?
    y - discard changes and apply the update  //丢弃修改执行更新操做
    n - abort the update and let you manually clean things up //放弃更新操作
    v - view modified files //查看有修改的文件
    d - view local modifications (diff) //比较修改的内容，diff操作
    s - stash changes and try to reapply them after the update //暂存修改，执行更新后释放修改
    ? - print help

　　一般我们选择s，类似于git stash后更新，然后git stash pop。有冲突再手工处理冲突。