func uninstallDevice(bundleID string) error {
	cmd := idevCmd(exec.Command(
		"ideviceinstaller",
		"-U", bundleID,
	))
	if out, err := cmd.CombinedOutput(); err != nil {
		os.Stderr.Write(out)
		return fmt.Errorf("ideviceinstaller -U %q: %s", bundleID, err)
	}
	return nil
}

func installDevice(appdir string) error {
	attempt := 0
	for {
		cmd := idevCmd(exec.Command(
			"ideviceinstaller",