$ git clone -n https://src.fedoraproject.org/rpms/ghc-cereal.git /var/lib/mock/f45-build-10100-413/root/chroot_tmpdir/scmroot/ghc-cereal
Cloning into '/var/lib/mock/f45-build-10100-413/root/chroot_tmpdir/scmroot/ghc-cereal'...
$ git fetch origin b5a1795343490980e1ace207e4339fed85888e86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cereal
 * [new ref]         b5a1795343490980e1ace207e4339fed85888e86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5a1795 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild