$ git clone -n https://src.fedoraproject.org/rpms/emacs-slime.git /var/lib/mock/f42-build-3401447-45130/root/chroot_tmpdir/scmroot/emacs-slime
Cloning into '/var/lib/mock/f42-build-3401447-45130/root/chroot_tmpdir/scmroot/emacs-slime'...
$ git fetch origin c790a0a29f2fc874890a27a72719c0f47f208d6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-slime
 * [new ref]         c790a0a29f2fc874890a27a72719c0f47f208d6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c790a0a Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild