$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-gtk.git /var/lib/mock/f40-build-795307-140106/root/chroot_tmpdir/scmroot/fcitx5-gtk
Cloning into '/var/lib/mock/f40-build-795307-140106/root/chroot_tmpdir/scmroot/fcitx5-gtk'...
$ git fetch origin 6ceaea9678c0ef6009f41709f8475a0e6cfc7b74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-gtk
 * [new ref]         6ceaea9678c0ef6009f41709f8475a0e6cfc7b74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ceaea9 update to upstream release 5.1.1