#!/usr/bin/env python

# Copyright 2018 The Crashpad Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Various code adapted from:
# https://cs.chromium.org/chromium/src/build/linux/sysroot_scripts/install-sysroot.py

import os
import shutil
import subprocess
import sys
import urllib2

SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))

# Sysroot revision from:
# https://cs.chromium.org/chromium/src/build/linux/sysroot_scripts/sysroots.json
SERVER = 'https://commondatastorage.googleapis.com'
PATH = 'chrome-linux-sysroot/toolchain'
REVISION = '3c248ba4290a5ad07085b7af07e6785bf1ae5b66'
FILENAME = 'debian_stretch_amd64_sysroot.tar.xz'


def main():
    url = '%s/%s/%s/%s' % (SERVER, PATH, REVISION, FILENAME)

    sysroot = os.path.join(SCRIPT_DIR, os.pardir, 'third_party', 'linux',
                           'sysroot')

    stamp = os.path.join(sysroot, '.stamp')
    if os.path.exists(stamp):
        with open(stamp) as s:
            if s.read() == url:
                return

    print 'Installing Debian root image from %s' % url

    if os.path.isdir(sysroot):
        shutil.rmtree(sysroot)
    os.mkdir(sysroot)
    tarball = os.path.join(sysroot, FILENAME)
    print 'Downloading %s' % url

    for _ in range(3):
        response = urllib2.urlopen(url)
        with open(tarball, 'wb') as f:
            f.write(response.read())
        break
    else:
        raise Exception('Failed to download %s' % url)

    subprocess.check_call(['tar', 'xf', tarball, '-C', sysroot])

    os.remove(tarball)

    with open(stamp, 'w') as s:
        s.write(url)


if __name__ == '__main__':
    main()
    sys.exit(0)