$ git clone -n https://src.fedoraproject.org/rpms/cataclysm-dda.git /var/lib/mock/f38-build-722022-98691/root/chroot_tmpdir/scmroot/cataclysm-dda
Cloning into '/var/lib/mock/f38-build-722022-98691/root/chroot_tmpdir/scmroot/cataclysm-dda'...
$ git fetch origin 6c730516db6ccda3d54e1c2b1b8bdac7559bdc5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cataclysm-dda
 * [new ref]         6c730516db6ccda3d54e1c2b1b8bdac7559bdc5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c73051 Fix changelog