Mac homebrew报错Error: homebrew-core is a shallow clone

Mac homebrew报错Error: homebrew-core is a shallow clone

1、现象

mac的brew出错，变化是操作系统升了个级。

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 command may take a few minutes to run due to the large size of the repository.
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!

2、解决方案

对于这个问题的解决，在报错中已经提示

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

但是，鉴于一定的因素，其同步速度特别慢，容易超时失败。可以考虑改用国内的镜像替代。

cd /usr/local/Homebrew/Library/Taps/homebrew/
rm -fr homebrew-core
cd /usr/local/Homebrew/Library/Taps/
mkdir homebrew
cd homebrew
git clone https://mirrors.tuna.tsinghua.edu.cn/git/homebrew-core.git

参考日志如下：

➜  homebrew git:(stable) git clone https://mirrors.tuna.tsinghua.edu.cn/git/homebrew-core.git
Cloning into 'homebrew-core'...
remote: Enumerating objects: 1205665, done.
remote: Counting objects: 100% (1205665/1205665), done.
remote: Compressing objects: 100% (390461/390461), done.
remote: Total 1205665 (delta 838256), reused 1170179 (delta 812067)
Receiving objects: 100% (1205665/1205665), 402.25 MiB | 977.00 KiB/s, done.
Resolving deltas: 100% (838256/838256), done.
Updating files: 100% (6435/6435), done.
➜  homebrew git:(stable) brew
Example usage:
  brew search TEXT|/REGEX/
  brew info [FORMULA|CASK...]
  brew install FORMULA|CASK...
  brew update
  brew upgrade [FORMULA|CASK...]
  brew uninstall FORMULA|CASK...
  brew list [FORMULA|CASK...]

Troubleshooting:
  brew config
  brew doctor
  brew install --verbose --debug FORMULA|CASK

Contributing:
  brew create URL [--no-fetch]
  brew edit [FORMULA|CASK...]

Further help:
  brew commands
  brew help [COMMAND]
  man brew
  https://docs.brew.sh
➜  homebrew git:(stable) brew update
Updated 1 tap (homebrew/core).
==> Outdated Formulae
freetds         gettext         libidn2         libtool         libunistring    ncurses         openssl@1.1     pcre            unixodbc        wget            zsh

You have 11 outdated formulae installed.
You can upgrade them with brew upgrade
or list them with brew outdated.

3、换源

网络上换源方法参考

## 更新 homebrew-cask
cd "$(brew --repo)"/Library/Taps/homebrew/homebrew-cask

# 更换源
git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-cask.git

# 更新，由于已经 cd 到相应文件夹了，因此不需要通过 -C 指定路径了
git fetch --unshallow 

## 更新 homebrew-core
cd "$(brew --repo)"/Library/Taps/homebrew/homebrew-core

# 更换源
git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git
# 更新
git fetch --unshallow 

# 检查
git remote -v 

如果出现问题，可以重设和强制更新

git fetch --all
git reset --hard origin/master 
git pull