brew 更新源

git remote -v

替换brew.git:
cd "$(brew --repo)"
中国科大:
git remote set-url origin https://mirrors.ustc.edu.cn/brew.git
清华大学:
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git

替换homebrew-core.git:
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
中国科大:
git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git
清华大学:
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git

替换homebrew-bottles:
中国科大:
echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles' >> ~/.zshrc
source ~/.zshrc
清华大学:
echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.tuna.tsinghua.edu.cn/homebrew-bottles' >> ~/.zshrc
source ~/.zshrc

应用生效
brew update
将旧有的软件安装包进行清理
brew cleanup

诊断Homebrew的问题:
brew doctor

重置brew.git设置:
cd "$(brew --repo)"
git fetch
git reset --hard origin/master

homebrew-core.git同理:
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git fetch
git reset --hard origin/master

应用生效:
brew update

换回官方源:
重置brew.git:
cd "$(brew --repo)"
git remote set-url origin https://github.com/Homebrew/brew.git

重置homebrew-core.git:
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://github.com/Homebrew/homebrew-core.git

应用生效
brew update

来源：https://www.jianshu.com/p/b26c7bc14440