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#!/usr/bin/env python3
# Copyright (c) 2013 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 building chromium.
"""
# 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 effect the chromium build until we
# choose to pull them in). The images will normally need to be rebuilt every
# time chrome's build dependencies are changed but should also be updated
# periodically to include upstream security fixes from Debian.
# This script looks at sysroots.json next to it to find the name of a .tar.xz
# to download and the location to extract it to. The extracted sysroot could for
# example be in build/linux/debian_sid_amd64-sysroot/.
from __future__ import print_function
import hashlib
import json
import platform
import optparse
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__))
URL_PREFIX = 'https://commondatastorage.googleapis.com'
URL_PATH = 'chrome-linux-sysroot/toolchain'
VALID_ARCHS = ('arm', 'arm64', 'i386', 'amd64', 'mips', 'mips64el')
ARCH_TRANSLATIONS = {
'x64': 'amd64',
'x86': 'i386',
'mipsel': 'mips',
'mips64': 'mips64el',
}
DEFAULT_TARGET_PLATFORM = 'sid'
class Error(Exception):
pass
def GetSha1(filename):
sha1 = hashlib.sha1()
with open(filename, 'rb') as f:
while True:
# Read in 1mb chunks, so it doesn't all have to be loaded into memory.
chunk = f.read(1024*1024)
if not chunk:
break
sha1.update(chunk)
return sha1.hexdigest()
def main(args):
parser = optparse.OptionParser('usage: %prog [OPTIONS]', description=__doc__)
parser.add_option('--arch',
help='Sysroot architecture: %s' % ', '.join(VALID_ARCHS))
parser.add_option('--all', action='store_true',
help='Install all sysroot images (useful when updating the'
' images)')
parser.add_option('--print-hash',
help='Print the hash of the sysroot for the given arch.')
options, _ = parser.parse_args(args)
if options.print_hash:
arch = options.print_hash
print(GetSysrootDict(DEFAULT_TARGET_PLATFORM,
ARCH_TRANSLATIONS.get(arch, arch))['Sha1Sum'])
return 0
if options.arch:
InstallSysroot(DEFAULT_TARGET_PLATFORM,
ARCH_TRANSLATIONS.get(options.arch, options.arch))
elif options.all:
for arch in VALID_ARCHS:
InstallSysroot(DEFAULT_TARGET_PLATFORM, arch)
else:
print('You much specify one of the options.')
return 1
return 0
def GetSysrootDict(target_platform, target_arch):
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 %s' % (target_platform, target_arch))
return sysroots[sysroot_key]
def InstallSysroot(target_platform, target_arch):
sysroot_dict = GetSysrootDict(target_platform, target_arch)
tarball_filename = sysroot_dict['Tarball']
tarball_sha1sum = sysroot_dict['Sha1Sum']
# TODO(thestig) Consider putting this elsewhere to avoid having to recreate
# it on every build.
linux_dir = os.path.dirname(SCRIPT_DIR)
sysroot = os.path.join(linux_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
print('Installing Debian %s %s root image: %s' % \
(target_platform, target_arch, sysroot))
if os.path.isdir(sysroot):
shutil.rmtree(sysroot)
os.mkdir(sysroot)
tarball = os.path.join(sysroot, tarball_filename)
print('Downloading %s' % url)
sys.stdout.flush()
sys.stderr.flush()
for _ in range(3):
try:
response = urlopen(url)
with open(tarball, "wb") as f:
f.write(response.read())
break
except Exception: # Ignore exceptions.
pass
else:
raise Error('Failed to download %s' % url)
sha1sum = GetSha1(tarball)
if sha1sum != tarball_sha1sum:
raise Error('Tarball sha1sum is wrong.'
'Expected %s, actual: %s' % (tarball_sha1sum, sha1sum))
subprocess.check_call(['tar', 'xf', tarball, '-C', sysroot])
os.remove(tarball)
with open(stamp, 'w') as s:
s.write(url)
if __name__ == '__main__':
try:
sys.exit(main(sys.argv[1:]))
except Error as e:
sys.stderr.write(str(e) + '\n')
sys.exit(1)
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