$ git clone -n https://src.fedoraproject.org/rpms/ocaml-sexplib.git /var/lib/mock/f38-build-side-42-init-devel-759988-27694/root/chroot_tmpdir/scmroot/ocaml-sexplib
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-759988-27694/root/chroot_tmpdir/scmroot/ocaml-sexplib'...
$ git fetch origin 450fab5e7d437ca99964eb5ebf2c0eb3f48b7063:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-sexplib
 * [new ref]         450fab5e7d437ca99964eb5ebf2c0eb3f48b7063 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 450fab5 Rebuild OCaml packages for F38