mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 16:14:16 +01:00
617dd87621
This follows from enabling tag deletion, however does require some consideration with the APIs. Now we can remove custom attributes, as well as determine if an attribute exists or not.
45 lines
1.1 KiB
Python
Executable File
45 lines
1.1 KiB
Python
Executable File
#!/usr/bin/env python
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import struct
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import sys
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import os
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import argparse
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def corrupt(block):
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with open(block, 'r+b') as file:
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# skip rev
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file.read(4)
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# go to last commit
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tag = 0xffffffff
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while True:
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try:
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ntag, = struct.unpack('<I', file.read(4))
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except struct.error:
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break
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tag ^= ntag
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size = (tag & 0xfff) if (tag & 0xfff) != 0xfff else 0
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file.seek(size, os.SEEK_CUR)
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# lob off last 3 bytes
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file.seek(-(size + 3), os.SEEK_CUR)
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file.truncate()
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def main(args):
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if args.n or not args.blocks:
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with open('blocks/.history', 'rb') as file:
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for i in range(int(args.n or 1)):
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last, = struct.unpack('<I', file.read(4))
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args.blocks.append('blocks/%x' % last)
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for block in args.blocks:
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print 'corrupting %s' % block
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corrupt(block)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser.add_argument('-n')
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parser.add_argument('blocks', nargs='*')
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main(parser.parse_args())
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