本文转载自：https://www.raydbg.com/2019/Homebrew-Update-Slow/，仅供个人学习参考使用。

近期使用Homebrew去下载安装软件的时候总是卡在update阶段，时间非常久，难以忍受。记录一下解决方法，

症状

使用Homebrew安装软件的时候一直卡在Update阶段。同时发现从github.com下载文件也极度缓慢（几十 KB/s）。

问题定位

使用brew update --verbose观察update过程：

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.

Fromhttps://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

发现update卡在从github仓库获取文件的过程。这个结果与手动从github下载文件慢的症状相互印证。

解决

由于问题主要是在国内网络环境github下载慢，因此尝试：

更换使用国内的homebrew镜像源；

使用代理访问github.com。

更换Homebrew源

使用以下命令更换国内阿里云上的homebrew镜像：

# 替换brew.git:

cd "$(brew --repo)"

git remote set-url originhttps://mirrors.aliyun.com/homebrew/brew.git

# 替换homebrew-core.git:

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

git remote set-url originhttps://mirrors.aliyun.com/homebrew/homebrew-core.git

# 替换homebrew-bottles:

echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.aliyun.com/homebrew/homebrew-bottles' >> ~/.zshrc

source ~/.zshrc

替换后，问题依旧，继续查看日志：

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...

Fromhttps://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

可以看到由于homebrew-cask的仓库依然指向了Github，这个过程还是慢。阿里云的镜像站没有提供homebrew-cask，进一步搜索找到USTC镜像站，该站提供了homebrew-cask的源。使用上述同样的命令更换源：

# 替换homebrew-cask.git:

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

git remote set-url originhttps://mirrors.ustc.edu.cn/homebrew-cask.git

测试发现问题解决。

Note: Homebrew Bottles源的更换方法详见这里。

官方源地址：

https://github.com/Homebrew/brew.git

https://github.com/Homebrew/homebrew-core.git

https://github.com/Homebrew/homebrew-cask

使用代理

家里的路由器已经配置好了SS代理，只要简单把github.com加入到黑名单强制走proxy就可以了。然而代理速度一般，效果不及上述方法。同时为了保证在其他网络环境下的效率，保留方法一所做的修改。

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Post author: Ray Wang

Post link: http://www.raydbg.com/2019/Homebrew-Update-Slow/

Copyright Notice: All articles in this blog are licensed under BY-NC-SA unless stating additionally.