$ git clone -n https://src.fedoraproject.org/rpms/ghc-SHA.git /var/lib/mock/f45-build-9935-411/root/chroot_tmpdir/scmroot/ghc-SHA
Cloning into '/var/lib/mock/f45-build-9935-411/root/chroot_tmpdir/scmroot/ghc-SHA'...
$ git fetch origin 45bbfc0a2827bb2e7404c338baacb9de2fcadaf0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-SHA
 * [new ref]         45bbfc0a2827bb2e7404c338baacb9de2fcadaf0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45bbfc0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild