远程操作家里的mac mini进行更新的时候，突然报错：
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- mini:Homebrew mini$ brew update
- Warning: No available formula with the name "ca-certificates".
- ==> Searching for similarly named formulae...
- Error: No similarly named formulae found.
- ==> Searching for a previously deleted formula (in the last month)...
- Warning: homebrew/core is shallow clone. To get its complete history, run:
- git -C "$(brew --repo homebrew/core)" fetch --unshallow
- Error: No previously deleted formula found.
- ==> Searching taps on GitHub...
- Error: No formulae found in taps.
- 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!
于是执行 git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow ，然而执行下来还是：
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- error: RPC failed; HTTP 504 curl 22 The requested URL returned error: 504 Gateway Time-out
- fatal: the remote end hung up unexpectedly
然后我就用打开git trace进行查看：
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- GIT_TRACE=2 git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
- 10:29:28.798061 exec-cmd.c:139 trace: resolved executable path from Darwin stack: /Applications/Xcode.app/Contents/Developer/usr/bin/git
- 10:29:28.798668 exec-cmd.c:236 trace: resolved executable dir: /Applications/Xcode.app/Contents/Developer/usr/bin
- 10:29:28.799328 git.c:418 trace: built-in: git fetch --unshallow
- 10:29:28.801482 run-command.c:643 trace: run_command: GIT_DIR=.git git-remote-https origin https://mirrors.ustc.edu.cn/homebrew-core.git
- 10:29:28.812513 exec-cmd.c:139 trace: resolved executable path from Darwin stack: /Applications/Xcode.app/Contents/Developer/usr/libexec/git-core/git-remote-https
- 10:29:28.813122 exec-cmd.c:236 trace: resolved executable dir: /Applications/Xcode.app/Contents/Developer/usr/libexec/git-core
- 10:29:28.929816 run-command.c:643 trace: run_command: git fetch-pack --stateless-rpc --stdin --lock-pack --include-tag --thin --depth=2147483647 https://mirrors.ustc.edu.cn/homebrew-core.git/
- 10:29:28.935164 exec-cmd.c:139 trace: resolved executable path from Darwin stack: /Applications/Xcode.app/Contents/Developer/usr/libexec/git-core/git
- 10:29:28.935863 exec-cmd.c:236 trace: resolved executable dir: /Applications/Xcode.app/Contents/Developer/usr/libexec/git-core
- 10:29:28.936585 git.c:418 trace: built-in: git fetch-pack --stateless-rpc --stdin --lock-pack --include-tag --thin --depth=2147483647 https://mirrors.ustc.edu.cn/homebrew-core.git/
- error: RPC failed; HTTP 504 curl 22 The requested URL returned error: 504 Gateway Time-out
- fatal: the remote end hung up unexpectedly
这个。。--depth=2147483647，居然这么深？
查到了网上的方案，参考在这里：记录: homebrew-core is a shallow clone - 腾讯云开发者社区-腾讯云 (tencent.com),我按上面的操作，删除了homebrew-core,homebrew-cask，再进行upgrade，果然 正常了。
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在非正常之前，做了不少操作，比如用官方的uninstall脚本清除了系统，然而也没有什么用。所幸，现在正常了。