#!/usr/bin/env python3
# encoding: utf-8
# Copyright 2021 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import argparse
import os
import pathlib
import sys
from util import build_utils
from util import resource_utils
import action_helpers # build_utils adds //build to sys.path.
def _FilterUnusedResources(r_text_in, r_text_out, unused_resources_config):
removed_resources = set()
with open(unused_resources_config, encoding='utf-8') as output_config:
for line in output_config:
# example line: attr/line_height#remove
resource = line.split('#')[0]
resource_type, resource_name = resource.split('/')
removed_resources.add((resource_type, resource_name))
kept_lines = []
with open(r_text_in, encoding='utf-8') as infile:
for line in infile:
# example line: int attr line_height 0x7f0014ee
resource_type, resource_name = line.split(' ')[1:3]
if (resource_type, resource_name) not in removed_resources:
kept_lines.append(line)
with open(r_text_out, 'w', encoding='utf-8') as out_file:
out_file.writelines(kept_lines)
def _WritePaths(dest_path, lines):
pathlib.Path(dest_path).write_text('\n'.join(lines) + '\n')
def main(args):
parser = argparse.ArgumentParser()
action_helpers.add_depfile_arg(parser)
parser.add_argument('--script',
required=True,
help='Path to the unused resources detector script.')
parser.add_argument(
'--dependencies-res-zips',
required=True,
action='append',
help='Resources zip archives to investigate for unused resources.')
parser.add_argument('--dexes',
action='append',
required=True,
help='Path to dex file, or zip with dex files.')
parser.add_argument(
'--proguard-mapping',
help='Path to proguard mapping file for the optimized dex.')
parser.add_argument('--r-text-in', required=True, help='Path to input R.txt')
parser.add_argument(
'--r-text-out',
help='Path to output R.txt with unused resources removed.')
parser.add_argument('--android-manifests',
action='append',
required=True,
help='Path to AndroidManifest')
parser.add_argument('--output-config',
required=True,
help='Path to output the aapt2 config to.')
args = build_utils.ExpandFileArgs(args)
options = parser.parse_args(args)
options.dependencies_res_zips = (action_helpers.parse_gn_list(
options.dependencies_res_zips))
# in case of no resources, short circuit early.
if not options.dependencies_res_zips:
build_utils.Touch(options.output_config)
return
with build_utils.TempDir() as temp_dir:
dep_subdirs = []
for dependency_res_zip in options.dependencies_res_zips:
dep_subdirs += resource_utils.ExtractDeps([dependency_res_zip], temp_dir)
# Use files for paths to avoid command line getting too long.
# https://crbug.com/362019371
manifests_file = os.path.join(temp_dir, 'manifests-inputs.txt')
resources_file = os.path.join(temp_dir, 'resources-inputs.txt')
dexes_file = os.path.join(temp_dir, 'dexes-inputs.txt')
_WritePaths(manifests_file, options.android_manifests)
_WritePaths(resources_file, dep_subdirs)
_WritePaths(dexes_file, options.dexes)
cmd = [
options.script,
'--rtxts',
options.r_text_in,
'--manifests',
manifests_file,
'--resourceDirs',
resources_file,
'--dexes',
dexes_file,
'--outputConfig',
options.output_config,
]
if options.proguard_mapping:
cmd += [
'--mapping',
options.proguard_mapping,
]
build_utils.CheckOutput(cmd)
if options.r_text_out:
_FilterUnusedResources(options.r_text_in, options.r_text_out,
options.output_config)
if options.depfile:
depfile_deps = (options.dependencies_res_zips + options.android_manifests +
options.dexes) + [options.r_text_in]
if options.proguard_mapping:
depfile_deps.append(options.proguard_mapping)
action_helpers.write_depfile(options.depfile, options.output_config,
depfile_deps)
if __name__ == '__main__':
main(sys.argv[1:])
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