chromium-latest.py 文件源码

def download_file_and_compare_hashes(file_to_download):

  hashes_file = '%s.hashes' % file_to_download

  if (args.clean):
    remove_file_if_exists(file_to_download)
    remove_file_if_exists(hashes_file)

  # Let's make sure we haven't already downloaded it.
  tarball_local_file = "./%s" % file_to_download
  if os.path.isfile(tarball_local_file):
    print "%s already exists!" % file_to_download
  else:
    path = '%s%s' % (chromium_url, file_to_download)
    print "Downloading %s" % path
    # Perhaps look at using python-progressbar at some point?
    info=urllib.urlretrieve(path, file_to_download, reporthook=dlProgress)[1]
    urllib.urlcleanup()
    print ""
    if (info["Content-Type"] != "application/x-tar"):
      print 'Chromium tarballs for %s are not on servers.' % file_to_download
      remove_file_if_exists (file_to_download)
      sys.exit(1)

  hashes_local_file = "./%s" % hashes_file
  if not os.path.isfile(hashes_local_file):
    path = '%s%s' % (chromium_url, hashes_file)
    print "Downloading %s" % path
    # Perhaps look at using python-progressbar at some point?
    info=urllib.urlretrieve(path, hashes_file, reporthook=dlProgress)[1]
    urllib.urlcleanup()
    print ""

  if os.path.isfile(hashes_local_file):
    with open(hashes_local_file, "r") as input_file:
      md5sum = input_file.readline().split()[1]
      md5 = hashlib.md5()
      with open(tarball_local_file, "rb") as f:
        for block in iter(lambda: f.read(65536), b""):
          md5.update(block)
        if (md5sum == md5.hexdigest()):
          print "MD5 matches for %s!" % file_to_download
        else:
          print "MD5 mismatch for %s!" % file_to_download
          sys.exit(1)
  else:
    print "Cannot compare hashes for %s!" % file_to_download