$ git clone -n https://src.fedoraproject.org/rpms/ghc-temporary.git /var/lib/mock/f45-build-10832-424/root/chroot_tmpdir/scmroot/ghc-temporary
Cloning into '/var/lib/mock/f45-build-10832-424/root/chroot_tmpdir/scmroot/ghc-temporary'...
$ git fetch origin c4ff107c3f48c9048b95d031c2416d5bf8dca216:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-temporary
 * [new ref]         c4ff107c3f48c9048b95d031c2416d5bf8dca216 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4ff107 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild