| #!/usr/bin/env python3.8 |
| # Copyright 2021 The Fuchsia Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import argparse |
| import json |
| import re |
| import subprocess |
| import sys |
| |
| |
| def extract_field(line, regex, name, fields): |
| result = regex.match(line) |
| if result: |
| fields[name] = result.group(1) |
| |
| |
| def main(): |
| parser = argparse.ArgumentParser( |
| description='Extract the descriptor fields from a vbmeta image') |
| parser.add_argument('--avbtool', required=True) |
| parser.add_argument('--vbmeta', required=True) |
| parser.add_argument('--output', type=argparse.FileType('w')) |
| parser.add_argument('--salt-only', action='store_true', default=False) |
| args = parser.parse_args() |
| |
| avb_output = subprocess.check_output( |
| [args.avbtool, 'info_image', '--image', args.vbmeta], |
| universal_newlines=True).splitlines() |
| |
| min_version_re = re.compile('.*Minimum libavb version:\s*([0-9\.]+)') |
| size_re = re.compile('.*Image Size:\s*([0-9]+) bytes') |
| name_re = re.compile('.*Partition Name:\s*(\w+)') |
| salt_re = re.compile('.*Salt:\s*([0-9a-f]+)') |
| digest_re = re.compile('.*Digest:\s*([0-9a-f]+)') |
| flags_re = re.compile('.*Flags:\s*([0-9a-f]+)') |
| |
| fields = {} |
| for line in avb_output: |
| extract_field(line, min_version_re, "min_avb_version", fields) |
| extract_field(line, size_re, "size", fields) |
| extract_field(line, name_re, "name", fields) |
| extract_field(line, salt_re, "salt", fields) |
| extract_field(line, digest_re, "digest", fields) |
| extract_field(line, flags_re, "flags", fields) |
| |
| if args.salt_only: |
| if "salt" in fields: |
| output = fields["salt"] |
| else: |
| return -1 |
| else: |
| output = json.dumps(fields, indent=2) |
| |
| if args.output is not None: |
| args.output.write(output) |
| else: |
| print(output) |
| |
| |
| if __name__ == '__main__': |
| sys.exit(main()) |
