$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ocamlgraph.git /var/lib/mock/f38-build-side-42-init-devel-600698-26173/root/chroot_tmpdir/scmroot/ocaml-ocamlgraph
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-600698-26173/root/chroot_tmpdir/scmroot/ocaml-ocamlgraph'...
$ git fetch origin 1f28c6f2aa72755b74c4339c16553f663c3b7c19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ocamlgraph
 * [new ref]         1f28c6f2aa72755b74c4339c16553f663c3b7c19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f28c6f Rebuild OCaml packages for F38