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tundra/tools/boot_backup.py

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+# SPDX-License-Identifier: MPL-2.0
+"""Validate the inventoried Sargo partition set before any boot experiment."""
+import json
+from pathlib import Path
+from tundra import digest
+
+SIZES = {'boot_a.img': 67108864, 'boot_b.img': 67108864,
+         'dtbo_a.img': 8417280, 'dtbo_b.img': 8417280,
+         'vbmeta_a.img': 65536, 'vbmeta_b.img': 65536}
+
+
+def verify(folder):
+    folder = Path(folder).resolve()
+    manifest = json.loads((folder / 'manifest.json').read_text())
+    if manifest.get('device') != 'sargo' or manifest.get('rawPartitions') is not True:
+        raise ValueError('Expected a raw Sargo partition backup')
+    if set(manifest.get('files', {})) != set(SIZES):
+        raise ValueError('Expected exactly boot, DTBO and vbmeta for both slots')
+    for name, size in SIZES.items():
+        path = folder / name
+        record = manifest['files'][name]
+        if path.is_symlink() or not path.is_file() or path.stat().st_size != size or record['bytes'] != size:
+            raise ValueError('Unexpected partition file or size: ' + name)
+        if digest(path) != record['sha256']:
+            raise ValueError('Partition checksum mismatch: ' + name)
+    return manifest