$ git clone -n https://src.fedoraproject.org/rpms/ghc-these.git /var/lib/mock/f45-build-10886-425/root/chroot_tmpdir/scmroot/ghc-these
Cloning into '/var/lib/mock/f45-build-10886-425/root/chroot_tmpdir/scmroot/ghc-these'...
$ git fetch origin d805b5e1e07d9dfe77392d646b50864fa46f7d97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-these
 * [new ref]         d805b5e1e07d9dfe77392d646b50864fa46f7d97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d805b5e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild