$ git clone -n https://src.fedoraproject.org/rpms/tmux.git /var/lib/mock/f40-build-2233822-53385/root/chroot_tmpdir/scmroot/tmux
Cloning into '/var/lib/mock/f40-build-2233822-53385/root/chroot_tmpdir/scmroot/tmux'...
$ git fetch origin e8852868f0ee3ea58f54cec7192d0e97a5fae85a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tmux
 * [new ref]         e8852868f0ee3ea58f54cec7192d0e97a5fae85a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e885286 Don't crash on showing certain glyph