change current process namespace

unshare.go

err := syscall.Unshare(syscall.CLONE_NEWPID|syscall.CLONE_NEWUTS)
if err != nil {
	fmt.Fprintln(os.Stderr, err)
}
err = syscall.Sethostname([]byte("container"))
if err != nil {
	fmt.Fprintln(os.Stderr, err)
}
cmd := exec.Command("/bin/sh")
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Run()