$ git clone -n https://src.fedoraproject.org/rpms/ghc-lukko.git /var/lib/mock/f45-build-10500-418/root/chroot_tmpdir/scmroot/ghc-lukko
Cloning into '/var/lib/mock/f45-build-10500-418/root/chroot_tmpdir/scmroot/ghc-lukko'...
$ git fetch origin 091deed3edd42252961c35b37eff9e44008dd6bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-lukko
 * [new ref]         091deed3edd42252961c35b37eff9e44008dd6bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 091deed Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild