$ git clone -n https://src.fedoraproject.org/rpms/clucene.git /var/lib/mock/f45-build-4223-331/root/chroot_tmpdir/scmroot/clucene
Cloning into '/var/lib/mock/f45-build-4223-331/root/chroot_tmpdir/scmroot/clucene'...
$ git fetch origin 0249cb2356ca0d4efc74b419b323f9ac52d90158:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clucene
 * [new ref]         0249cb2356ca0d4efc74b419b323f9ac52d90158 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0249cb2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild