$ git clone -n https://src.fedoraproject.org/rpms/lua-fluent.git /var/lib/mock/f45-build-17646-502/root/chroot_tmpdir/scmroot/lua-fluent
Cloning into '/var/lib/mock/f45-build-17646-502/root/chroot_tmpdir/scmroot/lua-fluent'...
$ git fetch origin 323c669d226e72019934b842d26096602ff2e021:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-fluent
 * [new ref]         323c669d226e72019934b842d26096602ff2e021 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 323c669 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild