$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mdx.git /var/lib/mock/f42-build-865902-173583/root/chroot_tmpdir/scmroot/ocaml-mdx
Cloning into '/var/lib/mock/f42-build-865902-173583/root/chroot_tmpdir/scmroot/ocaml-mdx'...
$ git fetch origin fc68a514749154792e5d8447dedcd31c613f8bbf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mdx
 * [new ref]         fc68a514749154792e5d8447dedcd31c613f8bbf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc68a51 OCaml 5.3.0 rebuild for Fedora 42