试用 go mod

试用 go mod

Go 1.11 支持 module.

代码不需要在 GOPATH/src 目录下。

先初始化模块，生成 go.mod

E:\temp
λ mkdir -p testmod\hello

E:\temp
λ cd testmod\hello\

E:\temp\testmod\hello
λ go mod init github.com/jinq0123/hello
go: creating new go.mod: module github.com/jinq0123/hello

创建 hello.go

package main

import (
	"fmt"
	"rsc.io/quote"
)

func main() {
	fmt.Println(quote.Hello())
}

构建时报 golang.org/x/text 连不上：

E:\temp\testmod\hello
λ go build
go: golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c: unrecog
nized import path "golang.org/x/text" (https fetch: Get https://g
olang.org/x/text?go-get=1: dial tcp 216.239.37.1:443: connectex:
A socket operation was attempted to an unreachable network.)
go: error loading module requirements

go.mod 添加

replace golang.org/x/text => github.com/golang/text v0.3.0

然后构建就成功了：

E:\temp\testmod\hello
λ go build
go: finding github.com/golang/text v0.3.0
go: downloading rsc.io/sampler v1.3.0
go: downloading github.com/golang/text v0.3.0

E:\temp\testmod\hello
λ hello.exe
Hello, world.

如果不加版本号，则会报错：

go.mod:9: replacement module without version must be directory path (rooted or starting with ./ or ../)

Go 1.11.1 replace 还有问题，仍会试图连接原地址。目前版本 1.11.4 可以用。