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bup-bloom - generates, regenerates, updates bloom filters


bup bloom [-d dir] [-o outfile] [-k hashes] [-c idxfile] [-f] [--ruin]


bup bloom builds a bloom filter file for a bup repository. If one already exists, it
checks the filter and updates or regenerates it as needed.


--ruin destroy bloom filters by setting the whole bitmask to zeros. you really want to
know what you are doing if run this and you want to delete the resulting bloom when
you are done with it.

-f, --force
don't update the existing bloom file; generate a new one from scratch.

-d, --dir=directory
the directory, containing .idx files, to process. Defaults to

-o, --outfile=outfile
the file to write the bloom filter to. defaults to $dir/bup.bloom

-k, --hashes=hashes
number of hash functions to use only 4 and 5 are valid. defaults to 5 for
repositories < 2 TiB, or 4 otherwise. See comments in git.py for more on this

-c, --check=idxfile
checks the bloom file (counterintuitively outfile) against the specified .idx file,
first checks that the bloom filter is claiming to contain the .idx, then checks
that it does actually contain all of the objects in the .idx. Does not write
anything and ignores the -k option.


Part of the bup(1) suite.


Brandon Low <[email protected]>.

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