[LogicException]                                                                   
  Key path "file:///tmp/oauth-private.key" does not exist or is not readable 

laravel-s服务器，通过laravel/passport鉴权时总是报上面错，后面发现是php bin/laravels start的启动用户权限问题，启动laravels的用户没有passport的密钥读取权限