Instrumented libraries: add a hook to download pre-built binaries.

third_party/instrumented_libraries/scripts/download_binaries.py

+#!/usr/bin/env python
+# Copyright (c) 2015 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.
+
+"""Downloads pre-built sanitizer-instrumented third-party libraries from GCS."""
+
+import os
+import subprocess
+import sys
+
+def get_ubuntu_release():
+  supported_releases = ['precise', 'trusty']
+  release = subprocess.check_output(['lsb_release', '-cs']).strip()
+  if release not in supported_releases:
+    raise Exception("Supported Ubuntu versions: %s", str(supported_releases))
+  return release
+
+
+def get_configuration(gyp_defines):
+  if 'msan=1' in gyp_defines:
+    if 'msan_track_origins=2' in gyp_defines:

[Nico, 2015/03/19 18:31:00]

do we need to support multiple modes for this? can we say we only support
chained origins and get rid of this toggle?

[earthdok, 2015/03/23 13:02:56]

We may want to support track_origins=0. It's used by a bot that ClusterFuzz
depends on.

Even if we only supported one mode, we'd still want to error out here rather
than download an abi-incompatible set of libraries. I don't see how this code
could be made simpler.

[Nico, 2015/03/23 16:35:09]

If there's only one mode, where would the abi incompatibility come from?

+      return 'msan-chained-origins'
+    if 'msan_track_origins' not in gyp_defines:
+      # NB: must be the same as the default value in common.gypi
+      return 'msan-chained-origins'
+  raise Exception(
+      "Prebuilt instrumented libraries not available for your configuration.")
+
+
+def get_archive_name(gyp_defines):
+  return "%s-%s.tgz" % (get_configuration(gyp_defines), get_ubuntu_release())
+
+
+def main(args):
+  gyp_defines = os.environ.get('GYP_DEFINES', '')
+  if not 'use_prebuilt_instrumented_libraries=1' in gyp_defines:
+    return 0
+

[Nico, 2015/03/19 18:31:00]

error out here if not on linux?

[earthdok, 2015/03/23 13:02:56]

Done.

+  archive_name = get_archive_name(gyp_defines)
+  sha1file = '%s.sha1' % archive_name
+  target_directory = 'src/third_party/instrumented_libraries/binaries/'
+
+  subprocess.check_call([
+      'download_from_google_storage',
+      '--no_resume',
+      '--no_auth',
+      '--bucket', 'chromium-instrumented-libraries',
+      '-s', sha1file], cwd=target_directory)
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))