$ git clone -n https://src.fedoraproject.org/rpms/openttd.git /var/lib/mock/f38-build-side-42-init-devel-723435-27298/root/chroot_tmpdir/scmroot/openttd
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-723435-27298/root/chroot_tmpdir/scmroot/openttd'...
$ git fetch origin 45864a257c2da2a8d4342d32f7609a1169f61904:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openttd
 * [new ref]         45864a257c2da2a8d4342d32f7609a1169f61904 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45864a2 update to 13.0