$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f41-build-side-1-2647455-27302/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f41-build-side-1-2647455-27302/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin c2294d917ee9d0ea93227a60147a14d1b532e543:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         c2294d917ee9d0ea93227a60147a14d1b532e543 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2294d9 6.1.4