$ git clone -n https://src.fedoraproject.org/rpms/cave9.git /var/lib/mock/f40-build-2207371-52080/root/chroot_tmpdir/scmroot/cave9
Cloning into '/var/lib/mock/f40-build-2207371-52080/root/chroot_tmpdir/scmroot/cave9'...
$ git fetch origin 6eb375b7b37b7a33164e629e8294584ec7ed4e0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cave9
 * [new ref]         6eb375b7b37b7a33164e629e8294584ec7ed4e0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6eb375b Drop -n from %autorelease