tools/android/strip_resources.py

# Copyright 2015 The Bazel Authors. All rights reserved.
#
# 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.

"""Removes the resources from a resource APK for incremental deployment.

The reason this utility exists is that the only way we can build a binary
AndroidManifest.xml is by invoking aapt, which builds a whole resource .apk.

Thus, in order to build the AndroidManifest.xml for an incremental .apk, we
invoke aapt, then extract AndroidManifest.xml from its output.
"""

import zipfile

from absl import app
from absl import flags

flags.DEFINE_string("input_resource_apk", None, "The input resource .apk")
flags.DEFINE_string("output_resource_apk", None, "The output resource .apk")

FLAGS = flags.FLAGS
HERMETIC_TIMESTAMP = (2001, 1, 1, 0, 0, 0)


def main(unused_argv):
  with zipfile.ZipFile(FLAGS.input_resource_apk) as input_zip:
    with input_zip.open("AndroidManifest.xml") as android_manifest_entry:
      android_manifest = android_manifest_entry.read()

  with zipfile.ZipFile(FLAGS.output_resource_apk, "w") as output_zip:
    # Timestamp is explicitly set so that the resulting zip file is hermetic
    zipinfo = zipfile.ZipInfo(
        filename="AndroidManifest.xml",
        date_time=HERMETIC_TIMESTAMP)
    output_zip.writestr(zipinfo, android_manifest)


if __name__ == "__main__":
  app.run(main)