subprojects/win-flex-bison-binaries/download-binary.py

   1 #!/usr/bin/env python3
   2
   3 import os
   4 import sys
   5 import ssl
   6 import zipfile
   7 import hashlib
   8 import urllib.request
   9 import urllib.error
  10
  11 # Disable certificate checking because it always fails on Windows
  12 # We verify the checksum anyway.
  13 ctx = ssl.create_default_context()
  14 ctx.check_hostname = False
  15 ctx.verify_mode = ssl.CERT_NONE
  16
  17 BASENAME = 'win_flex_bison-{}.zip'
  18 UPSTREAM_URL = 'https://github.com/lexxmark/winflexbison/releases/download/v{}/{}'
  19 GSTREAMER_URL = 'https://gstreamer.freedesktop.org/src/mirror/{}'
  20
  21 version = sys.argv[1]
  22 zip_sha256 = sys.argv[2]
  23 source_dir = os.path.join(os.environ['MESON_SOURCE_ROOT'], os.environ['MESON_SUBDIR'])
  24 dest = BASENAME.format(version)
  25 dest_path = os.path.join(source_dir, dest)
  26
  27 def get_sha256(zipf):
  28     hasher = hashlib.sha256()
  29     with open(zipf, 'rb') as f:
  30         hasher.update(f.read())
  31     return hasher.hexdigest()
  32
  33 if os.path.isfile(dest_path):
  34     found_sha256 = get_sha256(dest_path)
  35     if found_sha256 == zip_sha256:
  36         print('{} already downloaded'.format(dest))
  37         sys.exit(0)
  38     else:
  39         print('{} checksum mismatch, redownloading'.format(dest))
  40
  41 for url in (GSTREAMER_URL.format(dest), UPSTREAM_URL.format(version, dest)):
  42     print('Downloading {} to {}'.format(url, dest))
  43     try:
  44         with open(dest_path, 'wb') as d:
  45             f = urllib.request.urlopen(url, context=ctx)
  46             d.write(f.read())
  47         break
  48     except urllib.error.URLError as ex:
  49         print(ex)
  50         print('Failed to download from {!r}, trying mirror...'.format(url))
  51         continue
  52 else:
  53     curdir = os.path.dirname(sys.argv[0])
  54     print('Couldn\'t download {!r}! Try downloading it manually and '
  55           'placing it into {!r}'.format(dest, curdir))
  56
  57 found_sha256 = get_sha256(dest_path)
  58 if found_sha256 != zip_sha256:
  59     print('SHA256 of downloaded file {} was {} instead of {}'
  60           ''.format(dest, found_sha256, zip_sha256))
  61     sys.exit(1)
  62
  63 print('Extracting {}'.format(dest))
  64 zf = zipfile.ZipFile(dest_path, "r")
  65 zf.extractall(path=source_dir)