$ git clone -n https://src.fedoraproject.org/rpms/emacs.git /var/lib/mock/f40-build-2686848-68073/root/chroot_tmpdir/scmroot/emacs
Cloning into '/var/lib/mock/f40-build-2686848-68073/root/chroot_tmpdir/scmroot/emacs'...
$ git fetch origin de1de70ec0979106dcddcf157a327297126e6024:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs
 * [new ref]         de1de70ec0979106dcddcf157a327297126e6024 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de1de70 Obsolete the newer emacs-nox now in F39, fixing system upgrades