repack.log

$ bup init
Initialized empty Git repository in /tmp/.bup/

$ dd if=/dev/urandom of=foo count=10 bs=1M

$ bup index .
Indexing: 2, done.

$ bup save -n repack-demo .
Reading index: 2, done.
Saving: 100.00% (10244/10244k, 2/2 files), done.    
bloom: creating from 1 file (1357 objects).

$ du -hs /tmp/.bup
11M	/tmp/.bup

$ echo "" > foo

$ bup index .
Indexing: 2, done.    

$ bup save -n repack-demo .
Reading index: 2, done.
Saving: 100.00% (4/4k, 2/2 files), done.    
bloom: adding 1 file (5 objects).

$ du -hs /tmp/.bup
11M	/tmp/.bup 

$ echo "$(git rev-parse repack-demo)" > /tmp/.bup/info/grafts

$ git filter-branch repack-demo
Rewrite f6802e1f68758415c503a6be7e4f0d9c8e3e1f79 (1/1)
Ref 'refs/heads/repack-demo' was rewritten

$ bup repack
Traversing repack-demo to find needed objects...
Writing new packfiles...
Writing objects: 4, done.
bloom: creating from 1 file (3 objects).
bloom: adding 1 file (1 object).  

$ du -hs /tmp/.bup
172K	/tmp/.bup