mac root用户失去权利【/etc/sudoers is owned by uid 501, should be 0】

问题

# brew install tree
Updating Homebrew...
Error: The following directories are not writable by your user:
/usr/local/share/man/man8

You should change the ownership of these directories to your user.
  sudo chown -R $(whoami) /usr/local/share/man/man8

And make sure that your user has write permission.
  chmod u+w /usr/local/share/man/man8

于是

sudo chown -R $(whoami) /usr/local/*

但是

╰─$ sudo chown -R $(whoami) /usr/local/*
sudo: /etc/sudoers is owned by uid 501, should be 0
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin

501 是我当前登录的用户 nahongze ，而 0 应该是 root 用户。

解决

系统偏好设置 -> 用户与群组 -> 登录选项 -> 网络账户服务器 -> 加入 -> 打开目录实用工具 -> 解锁 -> 顶部菜单栏 -> 目录编辑器 -> 搜root 启用 Root 用户

打开终端切换到root

chown root:admin /etc/sudoers

参考