$ git clone -n https://src.fedoraproject.org/rpms/rcssserver.git /var/lib/mock/f45-build-34360-685/root/chroot_tmpdir/scmroot/rcssserver
Cloning into '/var/lib/mock/f45-build-34360-685/root/chroot_tmpdir/scmroot/rcssserver'...
$ git fetch origin 7cb71c70432a2a870a9cdcbbba45fc9b55cd86a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rcssserver
 * [new ref]         7cb71c70432a2a870a9cdcbbba45fc9b55cd86a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cb71c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild