135c1f144f
build_image.py has been handling fsverity metadata generation in the packing step, but it can cause issues because the metadata files are missing in the $OUT directory, and they only exist in result system.img. This change moves the generation logic into Makefile, and makes the metadata tracked by ninja graph. Bug: 206326351 Test: PRODUCT_SYSTEM_FSVERITY_GENERATE_METADATA := true and build Change-Id: I1f910d8ac6e2cc3c54f35916871733c632f18e44
96 lines
3.0 KiB
Python
96 lines
3.0 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright 2022 Google Inc. All rights reserved.
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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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`fsverity_manifest_generator` generates build manifest APK file containing
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digests of target files. The APK file is signed so the manifest inside the APK
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can be trusted.
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"""
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import argparse
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import common
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import os
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import subprocess
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import sys
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from fsverity_digests_pb2 import FSVerityDigests
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HASH_ALGORITHM = 'sha256'
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def _digest(fsverity_path, input_file):
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cmd = [fsverity_path, 'digest', input_file]
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cmd.extend(['--compact'])
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cmd.extend(['--hash-alg', HASH_ALGORITHM])
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out = subprocess.check_output(cmd, universal_newlines=True).strip()
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return bytes(bytearray.fromhex(out))
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if __name__ == '__main__':
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p = argparse.ArgumentParser()
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p.add_argument(
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'--output',
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help='Path to the output manifest APK',
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required=True)
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p.add_argument(
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'--fsverity-path',
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help='path to the fsverity program',
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required=True)
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p.add_argument(
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'--aapt2-path',
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help='path to the aapt2 program',
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required=True)
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p.add_argument(
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'--apksigner-path',
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help='path to the apksigner program',
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required=True)
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p.add_argument(
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'--apk-key-path',
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help='path to the apk key',
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required=True)
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p.add_argument(
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'--apk-manifest-path',
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help='path to AndroidManifest.xml',
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required=True)
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p.add_argument(
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'--base-dir',
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help='directory to use as a relative root for the inputs',
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required=True)
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p.add_argument(
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'inputs',
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nargs='+',
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help='input file for the build manifest')
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args = p.parse_args(sys.argv[1:])
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digests = FSVerityDigests()
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for f in sorted(args.inputs):
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# f is a full path for now; make it relative so it starts with {mount_point}/
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digest = digests.digests[os.path.relpath(f, args.base_dir)]
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digest.digest = _digest(args.fsverity_path, f)
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digest.hash_alg = HASH_ALGORITHM
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temp_dir = common.MakeTempDir()
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os.mkdir(os.path.join(temp_dir, "assets"))
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metadata_path = os.path.join(temp_dir, "assets", "build_manifest.pb")
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with open(metadata_path, "wb") as f:
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f.write(digests.SerializeToString())
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common.RunAndCheckOutput([args.aapt2_path, "link",
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"-A", os.path.join(temp_dir, "assets"),
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"-o", args.output,
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"--manifest", args.apk_manifest_path])
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common.RunAndCheckOutput([args.apksigner_path, "sign", "--in", args.output,
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"--cert", args.apk_key_path + ".x509.pem",
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"--key", args.apk_key_path + ".pk8"])
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