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#!/usr/bin/env python3
# Copyright 2019 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.
"""
Install Debian sysroots for cross compiling Open Screen.
"""
# The sysroot is needed to ensure that binaries that get built will run on
# the oldest stable version of Debian that we currently support.
# This script can be run manually but is more often run as part of gclient
# hooks. When run from hooks this script is a no-op on non-linux platforms.
# The sysroot image could be constructed from scratch based on the current state
# of the Debian archive but for consistency we use a pre-built root image (we
# don't want upstream changes to Debian to affect the build until we
# choose to pull them in). The sysroot images are stored in Chrome's common
# data storage, and the sysroots.json file should be kept in sync with Chrome's
# copy of it.
from __future__ import print_function
import hashlib
import json
import platform
import argparse
import os
import re
import shutil
import subprocess
import sys
try:
# For Python 3.0 and later
from urllib.request import urlopen
except ImportError:
# Fall back to Python 2's urllib2
from urllib2 import urlopen
SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
PARENT_DIR = os.path.dirname(SCRIPT_DIR)
URL_PREFIX = 'https://storage.googleapis.com'
URL_PATH = 'openscreen-sysroots'
VALID_ARCHS = ('arm', 'arm64')
VALID_PLATFORMS = ('stretch', 'sid')
class Error(Exception):
pass
def GetSha1(filename):
"""Generates a SHA1 hash for validating download. Done in chunks to avoid
excess memory usage."""
BLOCKSIZE = 1024 * 1024
sha1 = hashlib.sha1()
with open(filename, 'rb') as f:
chunk = f.read(BLOCKSIZE)
while chunk:
sha1.update(chunk)
chunk = f.read(BLOCKSIZE)
return sha1.hexdigest()
def GetSysrootDict(target_platform, target_arch):
"""Gets the sysroot information for a given platform and arch from the
sysroots.json file."""
if target_arch not in VALID_ARCHS:
raise Error('Unknown architecture: %s' % target_arch)
sysroots_file = os.path.join(SCRIPT_DIR, 'sysroots.json')
sysroots = json.load(open(sysroots_file))
sysroot_key = '%s_%s' % (target_platform, target_arch)
if sysroot_key not in sysroots:
raise Error('No sysroot for: %s' % (sysroot_key))
return sysroots[sysroot_key]
def DownloadFile(url, local_path):
"""Uses urllib to download a remote file into local_path."""
for _ in range(3):
try:
response = urlopen(url)
with open(local_path, "wb") as f:
f.write(response.read())
break
except Exception:
pass
else:
raise Error('Failed to download %s' % url)
def ValidateFile(local_path, expected_sum):
"""Generates the SHA1 hash of a local file to compare with an expected
hashsum."""
sha1sum = GetSha1(local_path)
if sha1sum != expected_sum:
raise Error('Tarball sha1sum is wrong.'
'Expected %s, actual: %s' % (expected_sum, sha1sum))
def InstallSysroot(target_platform, target_arch):
"""Downloads, validates, unpacks, and installs a sysroot image."""
sysroot_dict = GetSysrootDict(target_platform, target_arch)
tarball_filename = sysroot_dict['Tarball']
tarball_sha1sum = sysroot_dict['Sha1Sum']
sysroot = os.path.join(PARENT_DIR, sysroot_dict['SysrootDir'])
url = '%s/%s/%s/%s' % (URL_PREFIX, URL_PATH, tarball_sha1sum,
tarball_filename)
stamp = os.path.join(sysroot, '.stamp')
if os.path.exists(stamp):
with open(stamp) as s:
if s.read() == url:
return
if os.path.isdir(sysroot):
shutil.rmtree(sysroot)
os.mkdir(sysroot)
tarball_path = os.path.join(sysroot, tarball_filename)
DownloadFile(url, tarball_path)
ValidateFile(tarball_path, tarball_sha1sum)
subprocess.check_call(['tar', 'xf', tarball_path, '-C', sysroot])
os.remove(tarball_path)
with open(stamp, 'w') as s:
s.write(url)
def parse_args(args):
"""Parses the passed in arguments into an object."""
p = argparse.ArgumentParser()
p.add_argument(
'arch',
help='Sysroot architecture: %s' % ', '.join(VALID_ARCHS))
p.add_argument(
'platform',
help='Sysroot platform: %s' % ', '.join(VALID_PLATFORMS))
p.add_argument(
'--print-hash', action="store_true",
help='Print the hash of the sysroot for the specified arch.')
return p.parse_args(args)
def main(args):
if not (sys.platform.startswith('linux') or sys.platform == 'darwin'):
print('Unsupported platform. Only Linux and Mac OS X are supported.')
return 1
parsed_args = parse_args(args)
if parsed_args.print_hash:
print(GetSysrootDict(parsed_args.platform, parsed_args.arch)['Sha1Sum'])
InstallSysroot(parsed_args.platform, parsed_args.arch)
return 0
if __name__ == '__main__':
try:
sys.exit(main(sys.argv[1:]))
except Error as e:
sys.stderr.write('Installing sysroot error: {}\n'.format(e))
sys.exit(1)
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