88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (C) 2021 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Command-line tool for converting OTA payloads to VABC style COW images."""
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import os
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import sys
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import tempfile
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import zipfile
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import subprocess
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def IsSparseImage(filepath):
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"""Determine if an image is a sparse image
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Args:
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filepath: str, a path to an .img file
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Returns:
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return true iff the filepath is a sparse image.
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"""
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with open(filepath, 'rb') as fp:
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# Magic for android sparse image format
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# https://source.android.com/devices/bootloader/images
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return fp.read(4) == b'\x3A\xFF\x26\xED'
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def ConvertCOW(ota_path, target_file_path, tmp_dir, output_dir):
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"""Convert ota payload to COW IMAGE
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Args:
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ota_path: str, path to ota.zip
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target_file_path: str, path to target_file.zip,
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must be the target build for OTA.
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tmp_dir: A temp dir as scratch space
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output_dir: A directory where all converted COW images will be written.
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"""
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with zipfile.ZipFile(ota_path) as ota_zip:
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payload_path = ota_zip.extract("payload.bin", output_dir)
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with zipfile.ZipFile(target_file_path) as zfp:
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for fileinfo in zfp.infolist():
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img_name = os.path.basename(fileinfo.filename)
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if not fileinfo.filename.endswith(".img"):
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continue
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if fileinfo.filename.startswith("IMAGES/") or \
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fileinfo.filename.startswith("RADIO/"):
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img_path = zfp.extract(fileinfo, tmp_dir)
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target_img_path = os.path.join(output_dir, img_name)
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if IsSparseImage(img_path):
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subprocess.check_call(["simg2img", img_path, target_img_path])
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else:
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os.rename(img_path, target_img_path)
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print("Extracted", fileinfo.filename, "size:", fileinfo.file_size)
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subprocess.call(["cow_converter", payload_path,
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output_dir])
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def main():
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if len(sys.argv) != 4:
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print(
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"Usage:", sys.argv[0], "<your_ota.zip> <target_file.zip> <output dir>")
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return 1
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ota_path = sys.argv[1]
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target_file_path = sys.argv[2]
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output_dir = sys.argv[3]
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os.makedirs(output_dir, exist_ok=True)
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with tempfile.TemporaryDirectory() as tmp_dir:
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ConvertCOW(ota_path, target_file_path, tmp_dir, output_dir)
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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