Aner Zakobar
50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
#!/usr/bin/env python3
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import nbdkit
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import json
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import os
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backup_dir = "/mnt2/backed-up-drive/backupstore/volumes/2c/df/pvc-5c1f48e3-346f-4c35-8e6a-8fc0c4c3a842"
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blocks_dir = f"{backup_dir}/blocks"
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backup_cfg = f"{backup_dir}/backups/backup_backup-eac0221d1cab4a9c.cfg"
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with open(backup_cfg) as f:
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data = json.load(f)
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size = int(data['Size'])
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block_map = {b['Offset']: b['BlockChecksum'] for b in data['Blocks']}
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block_size = 2097152
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def thread_model():
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return nbdkit.THREAD_MODEL_SERIALIZE_ALL_REQUESTS
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def get_size():
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return size
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def pread(h, count, offset, flags):
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result = bytearray()
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remaining = count
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current_offset = offset
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while remaining > 0:
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block_start = (current_offset // block_size) * block_size
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block_offset = current_offset - block_start
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read_size = min(remaining, block_size - block_offset)
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if block_start in block_map:
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checksum = block_map[block_start]
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block_path = f"{blocks_dir}/{checksum[:2]}/{checksum[2:4]}/{checksum}.blk"
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if os.path.exists(block_path):
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with open(block_path, 'rb') as f:
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f.seek(block_offset)
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result.extend(f.read(read_size))
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else:
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result.extend(b'\x00' * read_size)
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else:
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result.extend(b'\x00' * read_size)
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current_offset += read_size
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remaining -= read_size
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return bytes(result)
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