$ git clone -n https://src.fedoraproject.org/rpms/emacs-deferred.git /var/lib/mock/f39-build-1535621-36247/root/chroot_tmpdir/scmroot/emacs-deferred
Cloning into '/var/lib/mock/f39-build-1535621-36247/root/chroot_tmpdir/scmroot/emacs-deferred'...
$ git fetch origin b3cb885ee40894b4d5f2e6ca6aefeeb3ffa082d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-deferred
 * [new ref]         b3cb885ee40894b4d5f2e6ca6aefeeb3ffa082d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3cb885 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild