问题

在使用homebrew安装golang 1.14时，执行go build会报请求超时错误

brew install go@1.14

...

==> go build
Last 15 lines from /Users/xx/Library/Logs/Homebrew/go@1.14/03.go:
2021-08-18 01:14:01 +0800

go
build

go: golang.org/x/net@v0.0.0-20190620200207-3b0461eec859: Get "https://proxy.golang.org/golang.org/x/net/@v/v0.0.0-20190620200207-3b0461eec859.mod": dial tcp 142.251.43.17:443: i/o timeout

问题定位

初步断定是在执行’go build’环节出现代理问题。国内用户需要设置代理

配置goproxy

尝试设置以上环境变量

export GOPROXY=https://goproxy.io,direct
export GO111MODULE=on

但不幸的是仍报相同错误，怀疑是安装过程中某个环节unset了环境变量

查看更多安装信息

使用-v参数进行安装

brew install go@1.14 -v

查看到homebrew安装golang 1.14的ruby脚本路径: ‘/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/go@1.14.rb’

并且能看到安装过程会下载2个压缩包，然后执行’./make.bash –no-clean’

/usr/bin/sandbox-exec -f /private/tmp/homebrew20210818-15926-10cv6ja.sb nice ruby -W1 -- /usr/local/Homebrew/Library/Homebrew/build.rb /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/go@1.14.rb --verbose

...

tar --extract --no-same-owner --file /Users/huangcheng/Library/Caches/Homebrew/downloads/5ce0f7e2a4821a377e09f2355ce146bf66f8e11bb6fc93320c8146a05198abc6--go1.14.15.src.tar.gz --directory /private/tmp/d20210818-15927-184e6dj

...

tar --extract --no-same-owner --file /Users/huangcheng/Library/Caches/Homebrew/downloads/ad0901a23a51bac69b65f20bbc8e3fe998bc87a3be91d0859ef27bd1fe537709--go1.7.darwin-amd64.tar.gz --directory /private/tmp/d20210818-15927-1qdv80h

...

==> ./make.bash --no-clean

...

打开rb文件，里面找到’make.bash’相关代码，是在src目录下执行make.bash

    cd "src" do
      ENV["GOROOT_FINAL"] = libexec
      system "./make.bash", "--no-clean"

找到这两个压缩包，解压找到src目录下的make.bash文件。发现之前设置的环境变量果然被unset了-_-!

export GOENV=off
unset GOBIN # Issue 14340
unset GOFLAGS
unset GO111MODULE

如何设置GO111MODULE

打开’/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/go@1.14.rb’文件，找到go build调用代码

...

      system "go", "build"

...

在执行代码前，重新设置一下环节变量

...

      ENV['GOPROXY'] = 'https://goproxy.io,direct'
      ENV['GO111MODULE'] = 'on'
      system "go", "build"

...

保存，重新执行安装命令’brew install go@1.14 -v’

==> Summary
🍺  /usr/local/Cellar/go@1.14/1.14.15: 9,471 files, 425.7MB, built in 1 minute 16 seconds

成功！