$ git clone -n https://src.fedoraproject.org/rpms/sddm-kcm.git /var/lib/mock/f42-build-side-1-3512360-46069/root/chroot_tmpdir/scmroot/sddm-kcm
Cloning into '/var/lib/mock/f42-build-side-1-3512360-46069/root/chroot_tmpdir/scmroot/sddm-kcm'...
$ git fetch origin b3240968d5a5d5ad82225c97cbbc152233c4d570:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sddm-kcm
 * [new ref]         b3240968d5a5d5ad82225c97cbbc152233c4d570 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b324096 6.3.4