Re: How to recovery a corrupted git repo

Axel Freyn [off-list ref] writes:

I don't know whether there is a single git command to do it, but you can
copy those 5 objects "by hand": in your backup, you should have a
directory .git/objects, where you have the files
   b7/1eb55f2dbc97dafd4a769fc61f346e69a5e0af
   28/2035f3ae964e1e288f352c370be8edd11d3078
   3c/20f556eecc476e3542cc522d46a62a4461fec6
   f3/21b578edeb452358497e832815d6cae6b36886
   6d/23f5084c975be637f7d748db82116bf84d3872

It should be sufficient to just copy those files into the corrupted
repo.

However if you packed the git-files in the backup (e.g. by running "git
gc"), those objects might be found in a pack in .git/objects/pack.
The easiest ist probably to use git-unpack-objects to unpack the
objects, and then copy the 5 missing objects.

There's also the brute-force approach

rsync $good_repo/.git/objects/ $bad_repo/.git/objects/
cd $bad_repo
git gc

Notice the absence of --delete in the rsync command: I'm just adding
new files in the $bad_repo, not deleting any (since files with
identical names must have identical content).

This will result in a lot of duplicates (objects found in several
packs), but "git gc" should be able to remove them.

(the notice about doing backups before also applies to my
proposal ;-) )

-- 
Matthieu Moy
http://www-verimag.imag.fr/~moy/

On Mon, Feb 21, 2011 at 10:51 PM, Matthieu Moy
[off-list ref] wrote:

Axel Freyn [off-list ref] writes:

There's also the brute-force approach

rsync $good_repo/.git/objects/ $bad_repo/.git/objects/
cd $bad_repo
git gc

Notice the absence of --delete in the rsync command: I'm just adding
new files in the $bad_repo, not deleting any (since files with
identical names must have identical content).

Thanks. This should be an applicable method. However, before rsyncing,
the pack should be unpacked first.