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February 21, 2018 23:11
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Calculates CRC32C checksum to repair a borked checksum in a except from that unimpaired Btrfs superblock
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| i=32; sudo dd if=/dev/sdb1 of=/dev/stdout bs=1 skip=$(expr 65536 + $i ) count=$(expr 4096 - $i)|python -c "import crcmod; import sys; import struct; crc32c = crcmod.predefined.Crc('crc-32c'); crc32c.update(sys.stdin.buffer.read()); final_value=struct.unpack('<I', struct.pack('>I', crc32c.crcValue))[0]; print('0x{:08x}'.format(final_value));" |
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