Make instrumented_libraries download script src-independent

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 re
 import subprocess
 import sys
 
+
+SCRIPT_PATH = os.path.abspath(__file__)
+BASE_PATH = os.path.normpath(os.path.join(SCRIPT_PATH, *(4 * ['..'])))
+
+# This defaults to the consuming project's base directory, e.g. 'src' in
+# chromium.
+BASE_DIR = os.path.basename(BASE_PATH)
+
+
 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 re.search(r'\b(msan)=1', gyp_defines):
@@ skipping 15 matching lines @@
 def main(args):
   gyp_defines = os.environ.get('GYP_DEFINES', '')
   if not 'use_prebuilt_instrumented_libraries=1' in gyp_defines:
     return 0
 
   if not sys.platform.startswith('linux'):
     raise Exception("'use_prebuilt_instrumented_libraries=1' requires Linux.")
 
   archive_name = get_archive_name(gyp_defines)
   sha1file = '%s.sha1' % archive_name
-  target_directory = 'src/third_party/instrumented_libraries/binaries/'
+  target_directory = os.path.join(
+      BASE_DIR, '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:]))