homebrew下载速度真是太慢了，切换到清华的

https://mirrors.tuna.tsinghua.edu.cn/help/homebrew/

git clone https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/install.git
cd install

并编辑其中的 install.sh：

BREW_REPO="https://github.com/Homebrew/brew"

改成：

BREW_REPO="https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git"

下面的两个包官方下载速度非常慢，用中国的镜像快很多

git clone git://mirrors.ustc.edu.cn/homebrew-core.git/ /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core 

git clone git://mirrors.ustc.edu.cn/homebrew-cask.git/ /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask 

运行

./install.sh

最后

brew update

下面的不用看，纯记录

另一个git浅拷贝的方法记在这里

进行两个仓库的shallow clone
git clone git://mirrors.ustc.edu.cn/homebrew-core.git/ /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core --depth=1

git clone git://mirrors.ustc.edu.cn/homebrew-cask.git/ /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask --depth=1


git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow