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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.
7This script can be run manually but is more often run as part of gclient
8hooks. When run from hooks this script should be a no-op on non-linux
9platforms.
10
11The sysroot image could be constructed from scratch based on the current
12state or precise/arm but for consistency we currently use a pre-built root
13image which was originally designed for building trusted NaCl code. The image
14will normally need to be rebuilt every time chrome's build dependancies are
15changed.
16
17Steps 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
28import os
29import shutil
30import subprocess
31import sys
32
33
34SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
35URL_PREFIX = 'https://storage.googleapis.com'
36URL_PATH = 'nativeclient-archive2/toolchain'
37REVISION = 13035
38TARBALL = 'sysroot-arm-trusted.tgz'
39
40def main(args):
41  if '--linux-only' in args:
42    # This argument is passed when run from the gclient hooks.
43    # In this case we return early on non-linux platforms
44    # or if GYP_DEFINES doesn't include target_arch=arm
45    if not sys.platform.startswith('linux'):
46      return 0
47
48    if "target_arch=arm" not in os.environ.get('GYP_DEFINES', ''):
49      return 0
50
51  src_root = os.path.dirname(os.path.dirname(SCRIPT_DIR))
52  sysroot = os.path.join(src_root, 'arm-sysroot')
53  url = "%s/%s/%s/%s" % (URL_PREFIX, URL_PATH, REVISION, TARBALL)
54
55  stamp = os.path.join(sysroot, ".stamp")
56  if os.path.exists(stamp):
57    with open(stamp) as s:
58      if s.read() == url:
59        print "ARM root image already up-to-date: %s" % sysroot
60        return 0
61
62  print "Installing ARM root image: %s" % sysroot
63  if os.path.isdir(sysroot):
64    shutil.rmtree(sysroot)
65  os.mkdir(sysroot)
66  tarball = os.path.join(sysroot, TARBALL)
67  curl = ['curl', '--fail', '-L', url, '-o', tarball]
68  if os.isatty(sys.stdout.fileno()):
69    curl.append('--progress')
70  else:
71    curl.append('--silent')
72  subprocess.check_call(curl)
73  subprocess.check_call(['tar', 'xf', tarball, '-C', sysroot])
74  os.remove(tarball)
75
76  with open(stamp, 'w') as s:
77    s.write(url)
78  return 0
79
80
81if __name__ == '__main__':
82  sys.exit(main(sys.argv[1:]))
83