Initial remote commit

test/kk.sh

@@ -0,0 +1,51 @@
+python3 -c "
+CHUNK = 128*512  # 64KB
+LV_START = 5120000*512
+
+with open('/dev/sda','rb') as f:
+    # Read full first metadata chunk
+    phys = LV_START + 4 * CHUNK
+    f.seek(phys)
+    data = f.read(CHUNK)
+
+# What's in it?
+import struct
+
+# Check for recognizable patterns
+print(f'First 64 bytes:')
+for i in range(0, 64, 16):
+    print(f'  {data[i:i+16].hex()}  {data[i:i+16].decode(\"latin1\",errors=\"replace\")}')
+
+# Check if it repeats
+chunk_size = len(data)
+period = None
+for p in [8, 16, 32, 64, 128, 256, 512]:
+    if data[:p] * (chunk_size // p) == data[:chunk_size - chunk_size%p]:
+        period = p
+        print(f'Data repeats every {p} bytes')
+        break
+
+# Check if first 8 bytes appear elsewhere in the chunk
+pattern = data[:8]
+count = 0
+pos = 0
+while True:
+    idx = data.find(pattern, pos)
+    if idx < 0: break
+    count += 1
+    pos = idx + 1
+print(f'First 8 bytes appear {count} times in chunk')
+
+# Check spacing between repetitions
+positions = []
+pos = 0
+while True:
+    idx = data.find(pattern, pos)
+    if idx < 0: break
+    positions.append(idx)
+    pos = idx + 1
+if len(positions) > 1:
+    gaps = [positions[i+1]-positions[i] for i in range(len(positions)-1)]
+    print(f'Positions: {positions[:10]}')
+    print(f'Gaps: {gaps[:10]}')
+"