Get Proguard flags from GMS clients (upstream part)

build/android/play_services/preprocess.py

Index: build/android/play_services/preprocess.py
diff --git a/build/android/play_services/preprocess.py b/build/android/play_services/preprocess.py
index b14ffad8b271023f46a260424fe7583209686faf..1b6898cd662af82afeef829ba1ee2148e342eb83 100755
--- a/build/android/play_services/preprocess.py
+++ b/build/android/play_services/preprocess.py
@@ -28,6 +28,7 @@ provided output directory.
 '''
 
 import argparse
+import datetime
 import glob
 import itertools
 import os
@@ -60,6 +61,11 @@ def main():
                              help='the output directory',
                              required=True,
                              metavar='FILE')
+  required_args.add_argument('-g',
+                             '--gni-out-file',
+                             help='the GN output file',
+                             required=True,
+                             metavar='FILE')
   required_args.add_argument('-c',
                              '--config-file',
                              help='the config file path',
@@ -74,10 +80,11 @@ def main():
 
   return ProcessGooglePlayServices(args.repository,
                                    args.out_dir,
+                                   args.gni_out_file,
                                    args.config_file)
 
 
-def ProcessGooglePlayServices(repo, out_dir, config_path):
+def ProcessGooglePlayServices(repo, out_dir, gni_out_file, config_path):
   config = utils.ConfigParser(config_path)
 
   tmp_root = tempfile.mkdtemp()
@@ -86,6 +93,7 @@ def ProcessGooglePlayServices(repo, out_dir, config_path):
     _ImportFromExtractedRepo(config, tmp_paths, repo)
     _ProcessResources(config, tmp_paths, repo)
     _CopyToOutput(tmp_paths, out_dir)
+    _EnumerateProguardFiles(gni_out_file, out_dir)
     _UpdateVersionInConfig(config, tmp_paths)
   finally:
     shutil.rmtree(tmp_root)
@@ -187,6 +195,39 @@ def _CopyToOutput(tmp_paths, out_dir):
   shutil.copytree(tmp_paths['imported_clients'], out_dir)
 
 
+gni_template = '''\
+# Copyright {year} The Chromium Authors. All rights reserved.

[Maria, 2017/04/19 18:20:22]

not sure that year should be computed. Generally copyright stays at the year the
file was first added?

[paulmiller, 2017/04/19 18:34:27]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file generated by {script}
+gms_proguard_configs = [
+{body}
+]
+'''
+
+# Write a GN file containing a list of each GMS client's proguard file (if any).
+def _EnumerateProguardFiles(gni_path, out_dir):
+  gni_dir = os.path.dirname(gni_path)
+
+  gni_lines = []
+  for client_dir in os.listdir(out_dir):
+    proguard_path = os.path.join(
+        out_dir, client_dir, 'proguard.txt')
+    if os.path.exists(os.path.dirname(proguard_path)):
+      relative = os.path.relpath(proguard_path, gni_dir)
+      gni_lines.append('  "' + relative + '",')
+  gni_lines.sort()
+
+  gni_text = gni_template.format(
+      year=datetime.datetime.now().year,
+      script=os.path.relpath(sys.argv[0], gni_dir),
+      body='\n'.join(gni_lines))
+
+  with open(gni_path, 'w') as gni_file:
+    gni_file.write(gni_text)
+
+
 def _UpdateVersionInConfig(config, tmp_paths):
   version_xml_path = os.path.join(tmp_paths['imported_clients'],
                                   config.version_xml_path)