GN: Add support for prebuilt instrumented libraries.

third_party/instrumented_libraries/scripts/unpack_binaries.py

Index: third_party/instrumented_libraries/scripts/unpack_binaries.py
diff --git a/third_party/instrumented_libraries/scripts/unpack_binaries.py b/third_party/instrumented_libraries/scripts/unpack_binaries.py
new file mode 100755
index 0000000000000000000000000000000000000000..3e1779069dbe8b050237ad27154fffd6fd3f451f
--- /dev/null
+++ b/third_party/instrumented_libraries/scripts/unpack_binaries.py
@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# Copyright 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.
+
+"""Unpacks pre-built sanitizer-instrumented third-party libraries."""
+
+import os
+import subprocess
+import shutil
+import sys
+
+import download_binaries
+
+
+def get_archive_name(archive_prefix):
+  return '%s-%s.tgz' % (archive_prefix, download_binaries.get_ubuntu_release())
+
+
+def main(archive_prefix, archive_dir, target_dir, stamp_dir=None):
+  shutil.rmtree(target_dir, ignore_errors=True)
+
+  os.mkdir(target_dir)
+  subprocess.check_call([
+      'tar',
+      '-zxf',
+      os.path.join(archive_dir, get_archive_name(archive_prefix)),
+      '-C',
+      target_dir])
+  stamp_file = os.path.join(stamp_dir or target_dir, '%s.txt' % archive_prefix)
+  open(stamp_file, 'w').close()
+
+  if stamp_dir:
+    with open(os.path.join(stamp_dir, '%s.d' % archive_prefix), 'w') as f:
+      f.write('%s: %s' % (
+          stamp_file, os.path.join(archive_dir,
+                                   get_archive_name(archive_prefix))))
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(*sys.argv[1:]))