git gc leaved my disk 100% full

[Jean Delvare <jdelvare@suse.de>]

Hi git developers,

Earlier today my desktop environment warned me that my /home was almost
full. I thought that running "git gc" on my git trees would maybe save
some disk space.

Unfortunately the opposite happened. "git gc" failed on me with:

fatal: sha1 file '.git/objects/pack/tmp_idx_XW7opV' write error: No space left on device
error: failed to run repack

and at that point the partition was 100% full. My git repository went
from 2.2 GB to 3.3 GB in the process, this is why.

While I understand the value of preserving temporary files for
debugging purpose, I don't think it makes sense in the context of the
"gc" command which precisely should get rid of such temporary files.

So please consider fixing "gc" so that it cleans up any temporary file
in case of failure.

Thanks,
-- 
Jean Delvare
SUSE L3 Support