Golang：获取导入包的路径

Question

I'm having difficulty when trying to get path of imported package. When I print result of os.Getwd() inside imported package, it's showing same path like on main package.

This what I did.

Project structure

lib/lib.go

package lib

import "os"
import "fmt"

func init() {
    dir, _ := os.Getwd()
    fmt.Println("lib.init() :", dir)
}

func GetPath() {
    dir, _ := os.Getwd()
    fmt.Println("lib.GetPath() :", dir)
}

main.go

package main

import "os"
import "fmt"
import "test-import/lib"

func main() {
    dir, _ := os.Getwd()
    fmt.Println("main :", dir)
    lib.GetPath()
}

Result

lib.init() : /Users/novalagung/Documents/go/src/test-import
main : /Users/novalagung/Documents/go/src/test-import
lib.GetPath() : /Users/novalagung/Documents/go/src/test-import

The result of os.Getwd() from lib/lib.go is still same path like on main. What I want is the real path of the package which is /Users/novalagung/Documents/go/src/test-import/lib/

What should I do? Is it possible?

Answer 1

If you can get a reference to something in the package, you can use reflect to get the import path.

Here's an example on Play:

package main

import (
    "bytes"
    "fmt"
    "reflect"
)

func main() {
    var b bytes.Buffer
    fmt.Println(reflect.TypeOf(b).PkgPath())
}