go - 如何从代码中获取当前的 GOPATH

Question

如何从代码块中获取当前的GOPATH？

runtime 只有 GOROOT:

// GOROOT returns the root of the Go tree.
// It uses the GOROOT environment variable, if set,
// or else the root used during the Go build.
func GOROOT() string {
    s := gogetenv("GOROOT")
    if s != "" {
        return s
    }
    return defaultGoroot
}

我可以创建一个将 GOROOT 替换为 GOPATH 的函数，但是有没有内置函数呢？

Answer 1

使用 os.Getenv

来自文档:

Getenv retrieves the value of the environment variable named by the key. It returns the value, which will be empty if the variable is not present.

例子:

package main

import (
    "fmt"
    "os"
    )

func main() {
    fmt.Println(os.Getenv("GOPATH"))
}

Go 1.8+ 更新

Go 1.8 具有通过 go/build 导出的默认 GOPATH:

package main

import (
    "fmt"
    "go/build"
    "os"
)

func main() {
    gopath := os.Getenv("GOPATH")
    if gopath == "" {
        gopath = build.Default.GOPATH
    }
    fmt.Println(gopath)
}