def _setDiskImageFormat(self): useQcowDiskFormat = getattr(self, 'useQcowDiskFormat', False) # if image ID was provided extract disk driver type from manifest if self.vm_image: if not useQcowDiskFormat and Image.isImageId(self.vm_image): image = Image(self.configHolder) self.disk_driver = image.getImageFormatByImageId(self.vm_image) return self.disk_driver = (useQcowDiskFormat and 'qcow2') or 'raw'