- print('Downloading and checksumming %s...' % filename)
- url = 'https://yt-dl.org/downloads/%s/%s' % (version, filename)
- data = urllib.request.urlopen(url).read()
+ fn = os.path.join(build_dir, filename)
+ with open(fn, 'rb') as f:
+ data = f.read()
+ if not data:
+ raise ValueError('File %s is empty!' % fn)