$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ocplib-simplex.git /var/lib/mock/f45-build-20644-572/root/chroot_tmpdir/scmroot/ocaml-ocplib-simplex
Cloning into '/var/lib/mock/f45-build-20644-572/root/chroot_tmpdir/scmroot/ocaml-ocplib-simplex'...
$ git fetch origin 68700b12058314ef72ead8e241f2383eafb21473:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ocplib-simplex
 * [new ref]         68700b12058314ef72ead8e241f2383eafb21473 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68700b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild