$ git clone -n https://src.fedoraproject.org/rpms/lucene++.git /var/lib/mock/f45-build-17715-503/root/chroot_tmpdir/scmroot/lucene++
Cloning into '/var/lib/mock/f45-build-17715-503/root/chroot_tmpdir/scmroot/lucene++'...
$ git fetch origin c875f5330ce116a2c093ae252a322c1ecd71ebe8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lucene++
 * [new ref]         c875f5330ce116a2c093ae252a322c1ecd71ebe8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c875f53 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild