$ git clone -n https://src.fedoraproject.org/rpms/kscreen.git /var/lib/mock/f41-build-860428-168945/root/chroot_tmpdir/scmroot/kscreen
Cloning into '/var/lib/mock/f41-build-860428-168945/root/chroot_tmpdir/scmroot/kscreen'...
$ git fetch origin b3e0aef5e5989b063f1441e219d4a59e4c8c0956:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreen
 * [new ref]         b3e0aef5e5989b063f1441e219d4a59e4c8c0956 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3e0aef 6.2.2