Mock user directory in Go

main.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"os/user"
)

func main() {
	dir, _ := ioutil.TempDir("", "mmctl-")
	defer os.RemoveAll(dir)

	u, err := user.Current()
	if err != nil {
		panic(err)
	}

	oldHomeDir := u.HomeDir
	u.HomeDir = dir
	defer func() {
		u.HomeDir = oldHomeDir
	}()

	fmt.Printf("User home is: %s\n", u.HomeDir)
}