Re: How to recovery a corrupted git repo

Hi,
On Mon, Feb 21, 2011 at 03:50:09PM +0800, Ping Yin wrote:

I have a corrupted git repo, with "git fsck", it shows

missing blob b71eb55f2dbc97dafd4a769fc61f346e69a5e0af
missing blob 282035f3ae964e1e288f352c370be8edd11d3078
missing tree 3c20f556eecc476e3542cc522d46a62a4461fec6
missing blob f321b578edeb452358497e832815d6cae6b36886
missing commit 6d23f5084c975be637f7d748db82116bf84d3872

And i also have a good backup repo. How can i recover the corrupted
repo with the backup repo?

I can do a rsync or fresh "git clone", however, is there any git
related commands to incrementally do this?

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.

Axel

PS: Well, I'm using git and I like it -- but I'm no specialist; so first
do a backup, before you follow my proposal ;-)