Example #1
0
func init() {
	execdriver.RegisterInitFunc(DriverName, func(args *execdriver.InitArgs) error {
		var container *libcontainer.Container
		f, err := os.Open(filepath.Join(args.Root, "container.json"))
		if err != nil {
			return err
		}
		if err := json.NewDecoder(f).Decode(&container); err != nil {
			f.Close()
			return err
		}
		f.Close()

		rootfs, err := os.Getwd()
		if err != nil {
			return err
		}
		syncPipe, err := nsinit.NewSyncPipeFromFd(0, uintptr(args.Pipe))
		if err != nil {
			return err
		}
		if err := nsinit.Init(container, rootfs, args.Console, syncPipe, args.Args); err != nil {
			return err
		}
		return nil
	})
}
Example #2
0
func main() {
	if len(os.Args) < 2 {
		log.Fatalf("invalid number of arguments %d", len(os.Args))
	}

	container, err := loadContainer()
	if err != nil {
		log.Fatalf("unable to load container: %s", err)
	}

	switch os.Args[1] {
	case "exec": // this is executed outside of the namespace in the cwd
		var nspid, exitCode int
		if nspid, err = readPid(); err != nil && !os.IsNotExist(err) {
			log.Fatalf("unable to read pid: %s", err)
		}

		if nspid > 0 {
			exitCode, err = nsinit.ExecIn(container, nspid, os.Args[2:])
		} else {
			term := nsinit.NewTerminal(os.Stdin, os.Stdout, os.Stderr, container.Tty)
			exitCode, err = nsinit.Exec(container, term, "", dataPath, os.Args[2:], nsinit.DefaultCreateCommand, nil)
		}

		if err != nil {
			log.Fatalf("failed to exec: %s", err)
		}
		os.Exit(exitCode)
	case "init": // this is executed inside of the namespace to setup the container
		// by default our current dir is always our rootfs
		rootfs, err := os.Getwd()
		if err != nil {
			log.Fatal(err)
		}

		pipeFd, err := strconv.Atoi(rawPipeFd)
		if err != nil {
			log.Fatal(err)
		}
		syncPipe, err := nsinit.NewSyncPipeFromFd(0, uintptr(pipeFd))
		if err != nil {
			log.Fatalf("unable to create sync pipe: %s", err)
		}

		if err := nsinit.Init(container, rootfs, console, syncPipe, os.Args[2:]); err != nil {
			log.Fatalf("unable to initialize for container: %s", err)
		}
	default:
		log.Fatalf("command not supported for nsinit %s", os.Args[0])
	}
}