$ git clone -n https://src.fedoraproject.org/rpms/openclonk.git /var/lib/mock/f41-build-756394-13418/root/chroot_tmpdir/scmroot/openclonk
Cloning into '/var/lib/mock/f41-build-756394-13418/root/chroot_tmpdir/scmroot/openclonk'...
$ git fetch origin 254df6708c8c83036f0c333742e9af62890e3d8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openclonk
 * [new ref]         254df6708c8c83036f0c333742e9af62890e3d8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 254df67 The upstream maintainer seems no longer available