git gc / git repack not removing unused objects?

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[Using git 1.6.4.2]

In one repo I have (136G objects directory, fully packed) I'm having
some trouble.
I've run git-gc --prune=now, git repack -Adf, and so on a half-dozen
times and each time I do so it gets bigger, not smaller.
Setting that aside for the moment, however, I've run into a stranger problem.

So I use "git verify-pack -v > gvp.out" and "sort -k3nr < gvp.out |
head -n 20" to find the top 20 largest blobs.
So I have a blob, b32c3d8e8e24d8d3035cf52f606c2873315fe2b8, and now I
want to know what tree (or trees) it is in, so I try this:


for i in $( git branch -a | sed -e 's/\*//g' | grep -v branch ); do if
git ls-tree -l -r -t $i | grep
b32c3d8e8e24d8d3035cf52f606c2873315fe2b8 > /dev/null; then echo $i;
fi; done

The results: no branch or tree appears to contain that blob.

So I tried a different approach:

for i in $( grep tree gvp.out  | awk '{ print $1 }' ); do if git
ls-tree $i | grep b32c3d8e8e24d8d3035cf52f606c2873315fe2b8 >
/dev/null; then echo $i; fi ; done

This time, I find (at least) one tree
(d813af1537358496ca34958bbff08b87590607bf) with the blob.
But which branches might that tree appear in? None.

For each branch, I ran "git ls-tree -l -r -t" and saved the output in
a file (one per branch).
Then I grepped each file for the tree (
(d813af1537358496ca34958bbff08b87590607bf) - no luck.
I grepped each file for the blob (b32...) - no luck.

The results seem to suggest that I have packed trees which reference
blobs, but that the trees themselves are not referenced in any branch
and therefore I would expect that they would be pruned.


-- 
Jon
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