sky/tools/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

SRC_ROOT = os.path.abspath(os.path.join(__file__, os.pardir, os.pardir, os.pardir))
VERSION_FILE = '.version.sha1'

def main():
    package_dir = os.path.join(SRC_ROOT, 'sky/packages/material_design_icons/lib')
    icons_dir = os.path.join(package_dir, 'icons')
    existing_sha1_path = os.path.join(icons_dir, VERSION_FILE)

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

    desired_sha1_path = os.path.join(package_dir, VERSION_FILE)

    with open(desired_sha1_path, 'r') as f:
        desired_sha1 = f.read()

    if existing_sha1 == desired_sha1:
        return

    print "Downloading missing material design icons"

    tgz_path = os.path.join(package_dir, 'material-design-icons.tgz')
    untar_path = os.path.join(package_dir, 'material-design-icons')

    url = 'https://storage.googleapis.com/mojo/material-design-icons/%s' % desired_sha1
    response = urllib2.urlopen(url)

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

    shutil.rmtree(icons_dir, ignore_errors=True)

    subprocess.call([ 'tar', '-xzf', tgz_path, '-C', package_dir ])
    subprocess.call([ 'mv', untar_path, icons_dir ])
    subprocess.call([ 'cp', desired_sha1_path, icons_dir ])

    os.unlink(tgz_path)

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