$ git clone -n https://src.fedoraproject.org/rpms/lua-cosmo.git /var/lib/mock/f45-build-17648-502/root/chroot_tmpdir/scmroot/lua-cosmo
Cloning into '/var/lib/mock/f45-build-17648-502/root/chroot_tmpdir/scmroot/lua-cosmo'...
$ git fetch origin c5814d4b98101f4e56547598b563c2a93fe78a75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-cosmo
 * [new ref]         c5814d4b98101f4e56547598b563c2a93fe78a75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5814d4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild