How to make a singleton in Go?

Question

go

You need to work with one config from several package.

Answer 1

package initsomething
func init() {var something type = whatyouwant}

package main
import _ "initsomething"

golang.org/ref/spec#Program_initialization_and_exe...
https://golang.org/doc/effective_go.html#init

Answer 2

like this:
or like this (make public methods to get values):

package config

func Host() string {
    return "";
}