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tundra/tools/read-sargo-gpt.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: MPL-2.0
+"""Read and validate both GPT copies on the inventoried 64 GB Sargo; no writes."""
+import base64,json,struct,zlib
+from pathlib import Path
+
+def read_gpt():
+    result={}
+    with open('/dev/mmcblk0','rb',buffering=0) as disk:
+        for name,lba in [('primary',1),('secondary',122142719)]:
+            disk.seek(lba*512);h=disk.read(512)
+            assert h[:8]==b'EFI PART'
+            length,crc=struct.unpack_from('<II',h,12)
+            assert 92<=length<=512
+            check=bytearray(h[:length]);check[16:20]=b'\0'*4
+            assert zlib.crc32(check)==crc
+            current,other,first,last=struct.unpack_from('<QQQQ',h,24)
+            assert current==lba and {current,other}=={1,122142719}
+            entries,count,size,crc=struct.unpack_from('<QIII',h,72)
+            assert count==72 and size==128
+            disk.seek(entries*512);table=disk.read(count*size)
+            assert len(table)==count*size and zlib.crc32(table)==crc
+            parts={}
+            for i in range(count):
+                e=table[i*size:(i+1)*size]
+                label=e[56:128].decode('utf-16le').rstrip('\0')
+                if label:parts[label]={'index':i+1,'attributes':struct.unpack_from('<Q',e,48)[0]}
+            result[name]={'headerLba':lba,'entriesLba':entries,'header':base64.b64encode(h).decode(),'table':base64.b64encode(table).decode(),'partitions':parts}
+    assert result['primary']['table']==result['secondary']['table']
+    result['bootId']=Path('/proc/sys/kernel/random/boot_id').read_text().strip()
+    return result
+print(json.dumps(read_gpt()))