$ git clone -n https://src.fedoraproject.org/rpms/lua-mosquitto.git /var/lib/mock/f45-build-17683-502/root/chroot_tmpdir/scmroot/lua-mosquitto
Cloning into '/var/lib/mock/f45-build-17683-502/root/chroot_tmpdir/scmroot/lua-mosquitto'...
$ git fetch origin 974a5d51d409248293267ff3b985dd74a416b3e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-mosquitto
 * [new ref]         974a5d51d409248293267ff3b985dd74a416b3e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 974a5d5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild