Git: “Corrupt loose object”

repare.sh

# Create a backup of the corrupt directory:
cp -R foo foo-backup
# Make a new clone of the remote repository to a new directory:
git clone git@www.mydomain.de:foo foo-newclone
# Delete the corrupt .git subdirectory:
rm -rf foo/.git
# Move the newly cloned .git subdirectory into foo:
mv foo-newclone/.git foo
# Delete the rest of the temporary new clone:
rm -rf foo-newclone