$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-gtk.git /var/lib/mock/f40-build-801594-143829/root/chroot_tmpdir/scmroot/fcitx5-gtk
Cloning into '/var/lib/mock/f40-build-801594-143829/root/chroot_tmpdir/scmroot/fcitx5-gtk'...
$ git fetch origin 10e941f5fb949b9c9a8b4187abac37b272ce746b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-gtk
 * [new ref]         10e941f5fb949b9c9a8b4187abac37b272ce746b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10e941f update to upstream release 5.1.2