func startGardenWithoutDefaultRootfs(argv ...string) *runner.RunningGarden {
	return runner.Start(gardenBin, initBin, nstarBin, dadooBin, testImagePluginBin, "", tarBin, argv...)
}
func startGarden(argv ...string) *runner.RunningGarden {
	rootfs := os.Getenv("GARDEN_TEST_ROOTFS")
	return runner.Start(gardenBin, initBin, nstarBin, dadooBin, testImagePluginBin, rootfs, tarBin, argv...)
}