Add a snapshot of flutter/engine/src/build to our sdk

build/linux/sysroot_scripts/install-sysroot.py

Index: build/linux/sysroot_scripts/install-sysroot.py
diff --git a/build/linux/sysroot_scripts/install-sysroot.py b/build/linux/sysroot_scripts/install-sysroot.py
new file mode 100755
index 0000000000000000000000000000000000000000..99fc2d6f459b4178651642b52b237584daeb4d34
--- /dev/null
+++ b/build/linux/sysroot_scripts/install-sysroot.py
@@ -0,0 +1,193 @@
+#!/usr/bin/env python
+# 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.
+
+# Script to install a Debian Wheezy sysroot for making official Google Chrome
+# Linux builds.
+# The sysroot is needed to make Chrome work for Debian Wheezy.
+# This script can be run manually but is more often run as part of gclient
+# hooks. When run from hooks this script should be a no-op on non-linux
+# platforms.
+
+# The sysroot image could be constructed from scratch based on the current
+# state or Debian Wheezy but for consistency we currently use a pre-built root
+# image. The image will normally need to be rebuilt every time chrome's build
+# dependancies are changed.
+
+import hashlib
+import platform
+import optparse
+import os
+import re
+import shutil
+import subprocess
+import sys
+
+
+SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
+URL_PREFIX = 'http://storage.googleapis.com'
+URL_PATH = 'chrome-linux-sysroot/toolchain'
+REVISION_AMD64 = 'a2d45701cb21244b9514e420950ba6ba687fb655'
+REVISION_ARM = 'a2d45701cb21244b9514e420950ba6ba687fb655'
+REVISION_I386 = 'a2d45701cb21244b9514e420950ba6ba687fb655'
+REVISION_MIPS = '7749d2957387abf225b6d45154c3ddad142148dc'
+TARBALL_AMD64 = 'debian_wheezy_amd64_sysroot.tgz'
+TARBALL_ARM = 'debian_wheezy_arm_sysroot.tgz'
+TARBALL_I386 = 'debian_wheezy_i386_sysroot.tgz'
+TARBALL_MIPS = 'debian_wheezy_mips_sysroot.tgz'
+TARBALL_AMD64_SHA1SUM = '601216c0f980e798e7131635f3dd8171b3dcbcde'
+TARBALL_ARM_SHA1SUM = '6289593b36616526562a4d85ae9c92b694b8ce7e'
+TARBALL_I386_SHA1SUM = '0090e5a4b56ab9ffb5d557da6a520195ab59b446'
+TARBALL_MIPS_SHA1SUM = '3b4d782a237db4aac185a638572a7747c1a21825'
+SYSROOT_DIR_AMD64 = 'debian_wheezy_amd64-sysroot'
+SYSROOT_DIR_ARM = 'debian_wheezy_arm-sysroot'
+SYSROOT_DIR_I386 = 'debian_wheezy_i386-sysroot'
+SYSROOT_DIR_MIPS = 'debian_wheezy_mips-sysroot'
+
+valid_archs = ('arm', 'i386', 'amd64', 'mips')
+
+
+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 DetectArch(gyp_defines):
+  # Check for optional target_arch and only install for that architecture.
+  # If target_arch is not specified, then only install for the host
+  # architecture.
+  if 'target_arch=x64' in gyp_defines:
+    return 'amd64'
+  elif 'target_arch=ia32' in gyp_defines:
+    return 'i386'
+  elif 'target_arch=arm' in gyp_defines:
+    return 'arm'
+  elif 'target_arch=mipsel' in gyp_defines:
+    return 'mips'
+
+  # Figure out host arch using build/detect_host_arch.py and
+  # set target_arch to host arch
+  build_dir = os.path.dirname(os.path.dirname(os.path.join(SCRIPT_DIR)))
+  sys.path.append(build_dir)
+  import detect_host_arch
+
+  detected_host_arch = detect_host_arch.HostArch()
+  if detected_host_arch == 'x64':
+    return 'amd64'
+  elif detected_host_arch == 'ia32':
+    return 'i386'
+  elif detected_host_arch == 'arm':
+    return 'arm'
+  elif detected_host_arch == 'mips':
+    return 'mips'
+  else:
+    print "Unknown host arch: %s" % detected_host_arch
+
+  return None
+
+
+def main():
+  if options.running_as_hook and not sys.platform.startswith('linux'):
+    return 0
+
+  gyp_defines = os.environ.get('GYP_DEFINES', '')
+
+  if options.arch:
+    target_arch = options.arch
+  else:
+    target_arch = DetectArch(gyp_defines)
+    if not target_arch:
+      print 'Unable to detect host architecture'
+      return 1
+
+  if options.running_as_hook and target_arch != 'arm' and target_arch != 'mips':
+    # When run from runhooks, only install the sysroot for an Official Chrome
+    # Linux build, except on ARM where we always use a sysroot.
+    skip_if_defined = ['branding=Chrome', 'buildtype=Official']
+    skip_if_undefined = ['chromeos=1']
+    for option in skip_if_defined:
+      if option not in gyp_defines:
+        return 0
+    for option in skip_if_undefined:
+      if option in gyp_defines:
+        return 0
+
+  # The sysroot directory should match the one specified in build/common.gypi.
+  # TODO(thestig) Consider putting this else where to avoid having to recreate
+  # it on every build.
+  linux_dir = os.path.dirname(SCRIPT_DIR)
+  if target_arch == 'amd64':
+    sysroot = os.path.join(linux_dir, SYSROOT_DIR_AMD64)
+    tarball_filename = TARBALL_AMD64
+    tarball_sha1sum = TARBALL_AMD64_SHA1SUM
+    revision = REVISION_AMD64
+  elif target_arch == 'arm':
+    sysroot = os.path.join(linux_dir, SYSROOT_DIR_ARM)
+    tarball_filename = TARBALL_ARM
+    tarball_sha1sum = TARBALL_ARM_SHA1SUM
+    revision = REVISION_ARM
+  elif target_arch == 'i386':
+    sysroot = os.path.join(linux_dir, SYSROOT_DIR_I386)
+    tarball_filename = TARBALL_I386
+    tarball_sha1sum = TARBALL_I386_SHA1SUM
+    revision = REVISION_I386
+  elif target_arch == 'mips':
+    sysroot = os.path.join(linux_dir, SYSROOT_DIR_MIPS)
+    tarball_filename = TARBALL_MIPS
+    tarball_sha1sum = TARBALL_MIPS_SHA1SUM
+    revision = REVISION_MIPS
+  else:
+    print 'Unknown architecture: %s' % target_arch
+    assert(False)
+
+  url = '%s/%s/%s/%s' % (URL_PREFIX, URL_PATH, revision, tarball_filename)
+
+  stamp = os.path.join(sysroot, '.stamp')
+  if os.path.exists(stamp):
+    with open(stamp) as s:
+      if s.read() == url:
+        print 'Debian Wheezy %s root image already up-to-date: %s' % \
+            (target_arch, sysroot)
+        return 0
+
+  print 'Installing Debian Wheezy %s root image: %s' % (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()
+  subprocess.check_call(['curl', '--fail', '-L', url, '-o', tarball])
+  sha1sum = GetSha1(tarball)
+  if sha1sum != tarball_sha1sum:
+    print 'Tarball sha1sum is wrong.'
+    print 'Expected %s, actual: %s' % (tarball_sha1sum, sha1sum)
+    return 1
+  subprocess.check_call(['tar', 'xf', tarball, '-C', sysroot])
+  os.remove(tarball)
+
+  with open(stamp, 'w') as s:
+    s.write(url)
+  return 0
+
+
+if __name__ == '__main__':
+  parser = optparse.OptionParser('usage: %prog [OPTIONS]')
+  parser.add_option('--running-as-hook', action='store_true',
+                    default=False, help='Used when running from gclient hooks.'
+                                        ' In this mode the sysroot will only '
+                                        'be installed for official Linux '
+                                        'builds or ARM Linux builds')
+  parser.add_option('--arch', type='choice', choices=valid_archs,
+                    help='Sysroot architecture: %s' % ', '.join(valid_archs))
+  options, _ = parser.parse_args()
+  sys.exit(main())