mac切換brew源以後報錯

Castor-MacBook:~ admin$ brew update
Error: 
  homebrew-core is a shallow clone.
To `brew update`, first run:
  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
This restriction has been made on GitHub's request because updating shallow
clones is an extremely expensive operation due to the tree layout and traffic of
Homebrew/homebrew-core and Homebrew/homebrew-cask. We don't do this for you
automatically to avoid repeatedly performing an expensive unshallow operation in
CI systems (which should instead be fixed to not use shallow clones). Sorry for
the inconvenience!
Castor-MacBook:~ admin$ git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
fatal: 啞 http 傳輸不支持 shalllow 能力

使用簡單的命令把homebrew的核心刪了, 然後再更新, 問題解決

rm -rf /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core
brew update