$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-optcomp.git /var/lib/mock/f38-build-side-42-init-devel-800793-28144/root/chroot_tmpdir/scmroot/ocaml-ppx-optcomp
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-800793-28144/root/chroot_tmpdir/scmroot/ocaml-ppx-optcomp'...
$ git fetch origin 0bb2352d96b2abf4f9b6a12525ef7a215afcaeab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-optcomp
 * [new ref]         0bb2352d96b2abf4f9b6a12525ef7a215afcaeab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0bb2352 Rebuild OCaml packages for F38