$ git clone -n https://src.fedoraproject.org/rpms/ocaml-stdcompat.git /var/lib/mock/f40-build-768298-125260/root/chroot_tmpdir/scmroot/ocaml-stdcompat
Cloning into '/var/lib/mock/f40-build-768298-125260/root/chroot_tmpdir/scmroot/ocaml-stdcompat'...
$ git fetch origin e1abfb4e11a3d5309c02a4973e51b95465238b18:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-stdcompat
 * [new ref]         e1abfb4e11a3d5309c02a4973e51b95465238b18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1abfb4 Bump release and rebuild