sky/sdk/lib/download_material_design_icons

#!/usr/bin/env python
# Copyright (c) 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import os
import shutil
import subprocess
import sys
import urllib2


def main():
    sky_lib_dir = os.path.dirname(os.path.abspath(__file__))
    assets_dir = os.path.join(sky_lib_dir, 'assets')
    icons_dir = os.path.join(assets_dir, 'material-design-icons')
    existing_sha1_path = os.path.join(icons_dir, 'material-design-icons.sha1')

    existing_sha1 = None
    if os.path.isfile(existing_sha1_path):
        with open(existing_sha1_path, 'r') as f:
            existing_sha1 = f.read()

    sha1_path = os.path.join(assets_dir, 'material-design-icons.sha1')

    with open(sha1_path, 'r') as f:
        sha1 = f.read()

    if existing_sha1 == sha1:
        return

    print "Downloading missing material design icons"

    tgz_path = os.path.join(assets_dir, 'material-design-icons.tgz')
    url = 'https://storage.googleapis.com/mojo/material-design-icons/%s' % sha1
    response = urllib2.urlopen(url)

    with open(tgz_path, 'wb') as f:
        f.write(response.read())

    shutil.rmtree(icons_dir, ignore_errors=True)

    output_path = os.path.join(assets_dir, tgz_path)
    subprocess.call([
        'tar', '-xzf', output_path, '-C', assets_dir
    ])

    subprocess.call([
        'cp', sha1_path, icons_dir
    ])

    os.unlink(tgz_path)

if __name__ == '__main__':
    sys.exit(main())