$ git clone -n https://src.fedoraproject.org/rpms/emacs-json-mode.git /var/lib/mock/f45-build-8101-376/root/chroot_tmpdir/scmroot/emacs-json-mode
Cloning into '/var/lib/mock/f45-build-8101-376/root/chroot_tmpdir/scmroot/emacs-json-mode'...
$ git fetch origin 816967cf31c50ef0497e37a802f80ae4db4daf67:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-json-mode
 * [new ref]         816967cf31c50ef0497e37a802f80ae4db4daf67 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 816967c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild