Hi, Can someone please point me to a relevant person? It looks like there is a potential issue with "*getImageSize()*" function there: *'image_bytes' might be referenced before assignment*. There is also a suspicion that this code is not used at all, so instead of fixing it might be a good idea to just delete it. See the code below: def getImageSize(disk_image, driver_type): ''' Obtain qcow2 image size in GiBs ''' if driver_type == 'block': dev_buffer = ' ' * 8 with open(disk_image) as device: dev_buffer = fcntl.ioctl(device.fileno(), BLKGETSIZE64, dev_buffer) image_bytes = struct.unpack(FORMAT, dev_buffer)[0] elif driver_type == 'file': image_bytes = os.stat(disk_image).st_size return float(image_bytes / GIB) Thank you in advance! Pavel