How to recovery a corrupted git repo

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?

btw, "git remote add and then git fetch" doesn't work, it reports

error: refs/heads/bringup does not point to a valid object!
error: refs/heads/fsl_imx_r9.3 does not point to a valid object!
error: refs/heads/bringup does not point to a valid object!
error: refs/heads/fsl_imx_r9.3 does not point to a valid object!
error: refs/heads/bringup does not point to a valid object!
error: refs/heads/fsl_imx_r9.3 does not point to a valid object!
error: refs/heads/bringup does not point to a valid object!
error: refs/heads/fsl_imx_r9.3 does not point to a valid object!
error: missing object referenced by 'refs/tags/v2.6.32'
error: missing object referenced by 'refs/tags/v2.6.32-rc1'
error: missing object referenced by 'refs/tags/v2.6.32-rc2'

On Mon, Feb 21, 2011 at 8:50 AM, Ping Yin [off-list ref] 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?

Please, have a look this FAQ entry:

https://git.wiki.kernel.org/index.php/GitFaq#How_to_fix_a_broken_repository.3F

And tell us what you did according to it.

Thanks,
Christian.

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 ;-)

Thanks, axel and Christian.

I am just look for a simpler method. since i have a full backup,
finally , i do something like following

git clone --bare --reference bad-repo.git foo.com:good-repo.git repo.git

On Mon, Feb 21, 2011 at 6:04 PM, Axel Freyn [off-list ref] wrote:

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

quoted

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 ;-)

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