unshare test

package main

import "syscall"
import "os"
import "fmt"

const CLONE_NEWNS  = 0x00020000
const CLONE_NEWUTS = 0x04000000
const CLONE_NEWIPC = 0x80000000
const CLONE_NEWUSER = 0x10000000
const CLONE_NEWPID = 0x20000000
const CLONE_NEWNET = 0x40000000

func main() {
 var flags = CLONE_NEWNS|CLONE_NEWUTS|CLONE_NEWPID|CLONE_NEWNET
 var ws syscall.WaitStatus = 0
 execSpec := &syscall.ProcAttr{
  Env: os.Environ(),
  Files:  []uintptr{os.Stdin.Fd(), os.Stdout.Fd(), os.Stderr.Fd()},
  Dir: "",
 }

 retu := syscall.Unshare(flags)
 if retu != nil {
  panic(fmt.Sprintf("unshare() failed: %s", retu))
 }
 pid, rete := syscall.ForkExec("/bin/bash", []string{"bash"}, execSpec)
 if rete != nil {
  panic(rete)
 } else {
  syscall.Wait4(pid, &ws, 0, nil)
 }
 os.Exit(0)
}