$ git clone -n https://src.fedoraproject.org/rpms/ocaml-labltk.git /var/lib/mock/f42-build-868737-176249/root/chroot_tmpdir/scmroot/ocaml-labltk
Cloning into '/var/lib/mock/f42-build-868737-176249/root/chroot_tmpdir/scmroot/ocaml-labltk'...
$ git fetch origin 279c9ea14eefbf99fd147426d468b55512652e3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-labltk
 * [new ref]         279c9ea14eefbf99fd147426d468b55512652e3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 279c9ea New upstream version 8.06.15