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#!/usr/bin/env python3
#
# Copyright 2022 Google Inc. 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.
"""
`fsverity_manifest_generator` generates the a manifest file containing digests
of target files.
"""
import argparse
import os
import subprocess
import sys
from fsverity_digests_pb2 import FSVerityDigests
HASH_ALGORITHM = 'sha256'
def _digest(fsverity_path, input_file):
cmd = [fsverity_path, 'digest', input_file]
cmd.extend(['--compact'])
cmd.extend(['--hash-alg', HASH_ALGORITHM])
out = subprocess.check_output(cmd, universal_newlines=True).strip()
return bytes(bytearray.fromhex(out))
if __name__ == '__main__':
p = argparse.ArgumentParser(fromfile_prefix_chars='@')
p.add_argument(
'--output',
help='Path to the output manifest',
required=True)
p.add_argument(
'--fsverity-path',
help='path to the fsverity program',
required=True)
p.add_argument(
'--base-dir',
help='directory to use as a relative root for the inputs',
required=True)
p.add_argument(
'inputs',
nargs='*',
help='input file for the build manifest')
args = p.parse_args()
digests = FSVerityDigests()
for f in sorted(args.inputs):
# f is a full path for now; make it relative so it starts with {mount_point}/
digest = digests.digests[os.path.relpath(f, args.base_dir)]
digest.digest = _digest(args.fsverity_path, f)
digest.hash_alg = HASH_ALGORITHM
manifest = digests.SerializeToString()
with open(args.output, "wb") as f:
f.write(manifest)
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