box/main.go at master · bugbuilder/box · GitHub

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package main

import (
	"log"
	"os"
	"os/exec"
	"syscall"
)

func main() {
	cmd := exec.Command(os.Args[1], os.Args[2:]...)

	cmd.Stdout = os.Stdout
	cmd.Stdin = os.Stdin
	cmd.Stderr = os.Stderr

	cmd.SysProcAttr = &syscall.SysProcAttr{
		Cloneflags:   syscall.CLONE_NEWUSER,
		Unshareflags: syscall.CLONE_NEWUTS,
		UidMappings: []syscall.SysProcIDMap{
			{
				ContainerID: 0,
				HostID:      os.Geteuid(),
				Size:        1,
			},
		},
		GidMappings: []syscall.SysProcIDMap{
			{
				ContainerID: 0,
				HostID:      os.Getegid(),
				Size:        1,
			},
		},
	}

	if err := cmd.Run(); err != nil {
		log.Printf("err %+v\n", err)
		os.Exit(1)
	}
}