$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ptime.git /var/lib/mock/f40-build-784198-133262/root/chroot_tmpdir/scmroot/ocaml-ptime
Cloning into '/var/lib/mock/f40-build-784198-133262/root/chroot_tmpdir/scmroot/ocaml-ptime'...
$ git fetch origin af2499c1dcec85e0232bee2b2f21bd2d258d1f7b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ptime
 * [new ref]         af2499c1dcec85e0232bee2b2f21bd2d258d1f7b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af2499c Rebuild for changed ocamlx(Toploop) hash