build/linux/install-arm-sysroot.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """Script to install ARM root image for cross building of ARM chrome on linux.
   7 This script can be run manually but is more often run as part of gclient
   8 hooks. When run from hooks this script should be a no-op on non-linux
   9 platforms.
  10
  11 The sysroot image could be constructed from scratch based on the current
  12 state or precise/arm but for consistency we currently use a pre-built root
  13 image which was originally designed for building trusted NaCl code. The image
  14 will normally need to be rebuilt every time chrome's build dependancies are
  15 changed.
  16
  17 Steps to rebuild the arm sysroot image:
  18
  19 - cd $SRC/native_client
  20 - ./tools/trusted_cross_toolchains/trusted-toolchain-creator.armel.precise.sh \
  21     UpdatePackageLists
  22 - ./tools/trusted_cross_toolchains/trusted-toolchain-creator.armel.precise.sh \
  23     BuildJail $SRC/out/arm-sysroot.tar.gz
  24 - gsutil cp -a public-read $SRC/out/arm-sysroot.tar.gz \
  25     nativeclient-archive2/toolchain/$NACL_REV/sysroot-arm-trusted.tgz
  26 """
  27
  28 # TODO(sbc): merge this script into:
  29 #  chrome/installer/linux/sysroot_scripts/install-debian.wheezy.sysroot.py
  30
  31 import hashlib
  32 import os
  33 import shutil
  34 import subprocess
  35 import sys
  36
  37
  38 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
  39 URL_PREFIX = 'https://storage.googleapis.com'
  40 URL_PATH = 'chrome-linux-sysroot/toolchain'
  41 REVISION = 285950
  42 TARBALL = 'debian_wheezy_arm_sysroot.tgz'
  43 TARBALL_SHA1SUM = 'fc2f54db168887c5190c4c6686c869bedf668b4e'
  44
  45
  46 def get_sha1(filename):
  47   sha1 = hashlib.sha1()
  48   with open(filename, 'rb') as f:
  49     while True:
  50       # Read in 1mb chunks, so it doesn't all have to be loaded into memory.
  51       chunk = f.read(1024*1024)
  52       if not chunk:
  53         break
  54       sha1.update(chunk)
  55   return sha1.hexdigest()
  56
  57
  58 def main(args):
  59   if '--linux-only' in args:
  60     # This argument is passed when run from the gclient hooks.
  61     # In this case we return early on non-linux platforms
  62     # or if GYP_DEFINES doesn't include target_arch=arm
  63     if not sys.platform.startswith('linux'):
  64       return 0
  65
  66     if "target_arch=arm" not in os.environ.get('GYP_DEFINES', ''):
  67       return 0
  68
  69   src_root = os.path.dirname(os.path.dirname(SCRIPT_DIR))
  70   sysroot = os.path.join(src_root, 'arm-sysroot')
  71   url = "%s/%s/%s/%s" % (URL_PREFIX, URL_PATH, REVISION, TARBALL)
  72
  73   stamp = os.path.join(sysroot, ".stamp")
  74   if os.path.exists(stamp):
  75     with open(stamp) as s:
  76       if s.read() == url:
  77         print "ARM root image already up-to-date: %s" % sysroot
  78         return 0
  79
  80   print "Installing ARM root image: %s" % sysroot
  81   if os.path.isdir(sysroot):
  82     shutil.rmtree(sysroot)
  83   os.mkdir(sysroot)
  84   tarball = os.path.join(sysroot, TARBALL)
  85   curl = ['curl', '--fail', '-L', url, '-o', tarball]
  86   if os.isatty(sys.stdout.fileno()):
  87     curl.append('--progress')
  88   else:
  89     curl.append('--silent')
  90   subprocess.check_call(curl)
  91   sha1sum = get_sha1(tarball)
  92   if sha1sum != TARBALL_SHA1SUM:
  93     print 'Tarball sha1sum is wrong.'
  94     print 'Expected %s, actual: %s' % (TARBALL_SHA1SUM, sha1sum)
  95     return 1
  96   subprocess.check_call(['tar', 'xf', tarball, '-C', sysroot])
  97   os.remove(tarball)
  98
  99   with open(stamp, 'w') as s:
 100     s.write(url)
 101   return 0
 102
 103
 104 if __name__ == '__main__':
 105   sys.exit(main(sys.argv[1:]))