解決Homebrew下載更新極慢的問題

近期使用Homebrew去下載安裝軟件的時候總是卡在update階段，時間非常久，難以忍受。記錄一下解決方法，

症狀

使用Homebrew安裝軟件的時候一直卡在Update階段。同時發現從github.com下載文件也極度緩慢（總是卡住不動了）。

問題定位

使用brew update --verbose觀察update過程：

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brew update --verbose Checking if we need to fetch /usr/local/Homebrew... Checking if we need to fetch /usr/local/Homebrew/Library/Taps/caskroom/homebrew-fonts... Fetching /usr/local/Homebrew... Checking if we need to fetch /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask... Checking if we need to fetch /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core... Fetching /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask... Fetching /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core... remote: Enumerating objects: 337, done. remote: Counting objects: 100% (337/337), done. remote: Compressing objects: 100% (88/88), done. remote: Total 298 (delta 221), reused 287 (delta 210), pack-reused 0 Receiving objects: 100% (298/298), 50.91 KiB | 39.00 KiB/s, done. Resolving deltas: 100% (221/221), completed with 39 local objects. From https://github.com/Homebrew/homebrew-core 65a45a9..583b7f1 master -> origin/master remote: Enumerating objects: 179429, done. remote: Counting objects: 100% (179429/179429), done. remote: Compressing objects: 100% (56607/56607), done. Receiving objects: 4% (7628/177189), 1.48 MiB | 8.00 KiB/s

 

發現update卡在從github倉庫獲取文件的過程。這個結果與手動從github下載文件慢的症狀相互印證。

解決

由於問題主要是在國內網絡環境github下載慢，因此嘗試：

1. 更換使用國內的homebrew鏡像源；
2. 使用代理訪問github.com。

更換Homebrew源

使用以下命令更換國內阿里雲上的homebrew鏡像：

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# 替換brew.git: cd "$(brew --repo)" git remote set-url origin https://mirrors.aliyun.com/homebrew/brew.git # 替換homebrew-core.git: cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core" git remote set-url origin https://mirrors.aliyun.com/homebrew/homebrew-core.git # 替換homebrew-bottles: echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.aliyun.com/homebrew/homebrew-bottles' >> ~/.zshrc source ~/.zshrc

 

替換後，問題依舊，繼續查看日誌：

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brew update --verbose Checking if we need to fetch /usr/local/Homebrew... Checking if we need to fetch /usr/local/Homebrew/Library/Taps/caskroom/homebrew-fonts... Fetching /usr/local/Homebrew... Checking if we need to fetch /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask... Checking if we need to fetch /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core... Fetching /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core... From https://mirrors.aliyun.com/homebrew/homebrew-core + 583b7f1...8435590 master -> origin/master (forced update) Fetching /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask... Fetching /usr/local/Homebrew/Library/Taps/caskroom/homebrew-fonts... remote: Enumerating objects: 179429, done. remote: Counting objects: 100% (179429/179429), done. remote: Compressing objects: 100% (56607/56607), done. Receiving objects: 6% (11170/177189), 2.16 MiB | 30.00 KiB/s

 

可以看到由於homebrew-cask的倉庫依然指向了Github，這個過程還是慢。阿里雲的鏡像站沒有提供homebrew-cask，進一步搜索找到USTC鏡像站，該站提供了homebrew-cask的源。使用上述同樣的命令更換源：

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# 替換homebrew-cask.git: cd "$(brew --repo)"/Library/Taps/homebrew/homebrew-cask git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-cask.git

 

測試發現問題解決。

Note: Homebrew Bottles源的更換方法詳見這裏。

官方源地址：
https://github.com/Homebrew/brew.git
https://github.com/Homebrew/homebrew-core.git
https://github.com/Homebrew/homebrew-cask