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#!/usr/bin/env python3
#
# Copyright 2021 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Script to generate a valid asset pack from a given assets folder.
Instant delivery is not supported.
"""
import argparse
import distutils.dir_util
import os
import shutil
import sys
import tempfile
manifest_template = """<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:dist="http://schemas.android.com/apk/distribution" package="{package_name}" split="{asset_pack_name}">
<dist:module dist:type="asset-pack">
<dist:delivery>
<dist:{delivery_mode}/>
</dist:delivery>
<dist:fusing dist:include="true"/>
</dist:module>
</manifest>
"""
def parse_args() -> argparse.Namespace:
"""Parse input arguments."""
parser = argparse.ArgumentParser(
description="Generates a valid asset pack from a given assets folder",
add_help=True)
parser.add_argument(
"--packagename", required=True, help="Package name of the app")
parser.add_argument(
"--assetpackname", required=True, help="Name of the asset pack module")
parser.add_argument(
"--deliverymode",
required=True,
choices=["install-time", "fast-follow", "on-demand"],
help="Delivery mode of the asset pack module")
parser.add_argument(
"--assetsdir", required=True, help="Folder to read assets from")
parser.add_argument("--outdir", required=True, help="Output folder")
parser.add_argument(
"--overwrite",
required=False,
action="store_true",
help="Overwrite existing files")
return parser.parse_args()
def abs_expand_all(path: str) -> str:
return os.path.abspath(os.path.expandvars(os.path.expanduser(path)))
def get_assets_dir(args: argparse.Namespace) -> str:
assets_dir = abs_expand_all(args.assetsdir)
if (not (os.path.isdir(assets_dir) and os.access(assets_dir, os.X_OK) and
os.access(assets_dir, os.R_OK))):
print(
"Assets folder ({assets_dir}) is not accessible. Check permissions."
.format(assets_dir=assets_dir),
file=sys.stderr)
sys.exit(-1)
return assets_dir
def create_output_dir(args: argparse.Namespace) -> str:
"""Get the output directory."""
output_dir = abs_expand_all(args.outdir)
if not os.path.isdir(output_dir):
try:
os.makedirs(output_dir)
except OSError as e:
print(e, file=sys.stderr)
sys.exit(-1)
if (not (os.path.isdir(output_dir) and os.access(output_dir, os.X_OK) and
os.access(output_dir, os.W_OK))):
print(
"Output folder ({output_dir}) is not accessible. Check permissions."
.format(output_dir=output_dir),
file=sys.stderr)
sys.exit(-1)
return output_dir
def get_output_file_name(output_dir: str, args: argparse.Namespace) -> str:
output_file_name = os.path.join(output_dir, args.assetpackname)
if os.path.exists(output_file_name) and not args.overwrite:
print(
"Output file {output_file_name} exists. Specify --overwrite to bypass. Exiting."
.format(output_file_name=output_file_name))
sys.exit(-1)
return output_file_name
def make_manifest(package_name: str, asset_pack_name: str, delivery_mode: str,
pack_directory: str) -> None:
"""Generate the Android Manifest file for the pack."""
manifest = manifest_template.format(
package_name=package_name,
asset_pack_name=asset_pack_name,
delivery_mode=delivery_mode)
manifest_folder = os.path.join(pack_directory, "manifest")
try:
os.makedirs(manifest_folder)
except OSError as e:
print("Cannot create manifest folder. {e}".format(
e=e), file=sys.stderr)
sys.exit(-1)
manifest_file_name = os.path.join(manifest_folder, "AndroidManifest.xml")
manifest_file = open(manifest_file_name, "w")
print(manifest, file=manifest_file)
manifest_file.close()
print("Generated {manifest}".format(manifest=manifest_file_name))
def copy_assets(src: str, dest: str) -> None:
"""Copy assets from one folder to another."""
assets_folder = os.path.join(dest, "assets")
try:
os.makedirs(assets_folder)
except OSError as e:
print("Cannot create assets folder. {e}".format(e=e), file=sys.stderr)
sys.exit(-1)
try:
distutils.dir_util.copy_tree(src, assets_folder)
except FileNotFoundError as e:
print(
"Cannot copy assets folder into temporary folder. {e}".format(e=e),
file=sys.stderr)
sys.exit(-1)
print(
"Copied assets into {assets_folder}".format(assets_folder=assets_folder))
def main():
args = parse_args()
assets_dir = get_assets_dir(args)
output_dir = create_output_dir(args)
output_file_name = get_output_file_name(output_dir, args)
with tempfile.TemporaryDirectory(dir=output_dir) as pack_dir:
print("Created temporary working folder: {pack_dir}".format(
pack_dir=pack_dir))
make_manifest(args.packagename, args.assetpackname, args.deliverymode,
pack_dir)
copy_assets(assets_dir, pack_dir)
output_pack_path = shutil.make_archive(
os.path.join(output_dir, output_file_name), "zip", pack_dir)
print("Asset pack is generated at {output_pack_path}.\nDone.".format(
output_pack_path=output_pack_path))
if __name__ == "__main__":
main()
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