Re: Missing blobs after pruning dangling commits

From: Michael J Gruber <git@drmicha.warpmail.net>
Date: Aug 23, 2011, 09:29 UTC
Message-ID: <4E5372E5.1070509@drmicha.warpmail.net>
In-Reply-To: <CAC9GOO-cAKTvUyKvrijA8H8z4uRFkTjzJ_dqS_-aO1MYB-yaTw@mail.gmail.com>

Marcin Wiśnicki venit, vidit, dixit 22.08.2011 16:29:

Show 42 quoted lines

> Hello,
> 
> recently I had git-fsck report some dangling references:
> 
> $ git fsck
> dangling commit 9275ee571ead7a75ba57e16ba23155a178459918
> dangling commit 047bd63ae82b7540098515467f50562e374edada
> dangling commit 839cee3c8e16231e6523ecf8b855ef0863787990
> dangling commit f7cb119ea71cb3cc739331f2e26bf3e9fdbba24a
> dangling commit 68d41b28f320aff303c5a89b25e2243ad2e526f2
> dangling commit effcf50a636d2f08e21706f41eb8ae3c4c577166
> 
> This is completely local (isolated) repository.
> Based on related FAQ entry ("remove old objects after filter-branch"),
> I did this:
> 
> $ git reflog expire --expire=0 --all
> $ git repack -ad
> $ git prune
> 
> Unfortunately, now fsck complains:
> 
> $ git fsck
> missing blob 6d2ddd86d4594f8c756cc31b72d61653255a3161
> missing blob 6c537408f0b2226c0b6dae9b0ef0f92710fb25ed
> missing blob 2db55c1e39fd80e39eccefc617b852d3ac93abe9
> $ git --version
> git version 1.7.6.msysgit.0
> 
> Is this a bug ?
> 
> Also, how can I find where this blob came from. I've tried grepping
> all commits in original repo (from backup):
> 
> $ gitwhich() {
>   git log --all --pretty=format:'%T %H' | while read tree commit; do
>     git ls-tree -r $tree | grep -q $1 && echo $commit;
>   done
> }
> $ gitwhich 2db55c1e39fd80e39eccefc617b852d3ac93abe9
> 
> but nothing was found.

Suggestions:

Try git fsck --unreachable. There may be tree objects which reference those blobs but are not referenced by a tree or commit. (They should have been pruned, but could have been stuck in a pack.)

Try repacking again after the prune step.

Could you share that repo or is it private?

Michael