$ git clone -n https://src.fedoraproject.org/rpms/emacs-deferred.git /var/lib/mock/f42-build-3272929-41309/root/chroot_tmpdir/scmroot/emacs-deferred
Cloning into '/var/lib/mock/f42-build-3272929-41309/root/chroot_tmpdir/scmroot/emacs-deferred'...
$ git fetch origin 3c0810f6a324574cb065a4bd191853a7181986c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-deferred
 * [new ref]         3c0810f6a324574cb065a4bd191853a7181986c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c0810f Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild