$ git clone -n https://src.fedoraproject.org/rpms/lua-cyrussasl.git /var/lib/mock/f45-build-17644-502/root/chroot_tmpdir/scmroot/lua-cyrussasl
Cloning into '/var/lib/mock/f45-build-17644-502/root/chroot_tmpdir/scmroot/lua-cyrussasl'...
$ git fetch origin c3b9f3b897e88a1d3e9b33c97dcbe69e2043b412:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-cyrussasl
 * [new ref]         c3b9f3b897e88a1d3e9b33c97dcbe69e2043b412 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c3b9f3b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild