return err
	}
	defer closer()

	return runDevice(appdir, bundleID, os.Args[2:])
}

func getenv(envvar string) string {
	s := os.Getenv(envvar)
	if s == "" {
		log.Fatalf("%s not set\nrun $GOROOT/misc/ios/detect.go to attempt to autodetect", envvar)
	}
	return s
}

func assembleApp(appdir, bin string) error {
	if err := os.MkdirAll(appdir, 0755); err != nil {
		return err
	}