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#!/usr/bin/env python3
#
# Copyright (C) 2021 The Android Open Source Project
#
# 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.
#
"""Command-line tool for converting OTA payloads to VABC style COW images."""
import os
import sys
import tempfile
import zipfile
import subprocess
def IsSparseImage(filepath):
"""Determine if an image is a sparse image
Args:
filepath: str, a path to an .img file
Returns:
return true iff the filepath is a sparse image.
"""
with open(filepath, 'rb') as fp:
# Magic for android sparse image format
# https://source.android.com/devices/bootloader/images
return fp.read(4) == b'\x3A\xFF\x26\xED'
def ConvertCOW(ota_path, target_file_path, tmp_dir, output_dir):
"""Convert ota payload to COW IMAGE
Args:
ota_path: str, path to ota.zip
target_file_path: str, path to target_file.zip,
must be the target build for OTA.
tmp_dir: A temp dir as scratch space
output_dir: A directory where all converted COW images will be written.
"""
with zipfile.ZipFile(ota_path) as ota_zip:
payload_path = ota_zip.extract("payload.bin", output_dir)
with zipfile.ZipFile(target_file_path) as zfp:
for fileinfo in zfp.infolist():
img_name = os.path.basename(fileinfo.filename)
if not fileinfo.filename.endswith(".img"):
continue
if fileinfo.filename.startswith("IMAGES/") or \
fileinfo.filename.startswith("RADIO/"):
img_path = zfp.extract(fileinfo, tmp_dir)
target_img_path = os.path.join(output_dir, img_name)
if IsSparseImage(img_path):
subprocess.check_call(["simg2img", img_path, target_img_path])
else:
os.rename(img_path, target_img_path)
print("Extracted", fileinfo.filename, "size:", fileinfo.file_size)
subprocess.call(["cow_converter", payload_path,
output_dir])
def main():
if len(sys.argv) != 4:
print(
"Usage:", sys.argv[0], "<your_ota.zip> <target_file.zip> <output dir>")
return 1
ota_path = sys.argv[1]
target_file_path = sys.argv[2]
output_dir = sys.argv[3]
os.makedirs(output_dir, exist_ok=True)
with tempfile.TemporaryDirectory() as tmp_dir:
ConvertCOW(ota_path, target_file_path, tmp_dir, output_dir)
return 0
if __name__ == '__main__':
sys.exit(main())
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