mac homebrew fatal: not in a git directory

问题： 在用homebrew安装软件时， 提示报错

fatal: not in a git directory
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解决办法

先执行

brew -v
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出现如下提示：

Homebrew 4.0.1-60-g6ad9294
fatal: detected dubious ownership in repository at '/opt/homebrew/Library/Taps/homebrew/homebrew-core'
To add an exception for this directory, call:

	git config --global --add safe.directory /opt/homebrew/Library/Taps/homebrew/homebrew-core
Homebrew/homebrew-core (no Git repository)
fatal: detected dubious ownership in repository at '/opt/homebrew/Library/Taps/homebrew/homebrew-cask'
To add an exception for this directory, call:

	git config --global --add safe.directory /opt/homebrew/Library/Taps/homebrew/homebrew-cask
Homebrew/homebrew-cask (no Git repository)
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按照上面的提示， 在终端上执行命令。

git config --global --add safe.directory /opt/homebrew/Library/Taps/homebrew/homebrew-core
git config --global --add safe.directory /opt/homebrew/Library/Taps/homebrew/homebrew-cask
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设置完毕后， 即可解决报错，成功安装。