外部文件夹权限是 www-data。里面的权限是 root，怎么求解

host('xx.xx.xxxx') ->user('root') ->identityFile('~/.ssh/xingchen.pem') ->become('www-data') ->set('deploy_path', '/var/www/cudc-deployer');

drwxr-xr-x 12 www-data www-data   4096 Apr  9 06:50 ./
drwxr-xr-x  3 www-data www-data   4096 Apr  9 06:49 ../
drwxr-xr-x 11 root     root       4096 Apr  9 06:50 app/
-rwxr-xr-x  1 root     root       1686 Apr  9 06:50 artisan*
...

`