$ git clone -n https://src.fedoraproject.org/rpms/ocaml-sexplib0.git /var/lib/mock/f38-build-side-42-init-devel-780850-27901/root/chroot_tmpdir/scmroot/ocaml-sexplib0
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-780850-27901/root/chroot_tmpdir/scmroot/ocaml-sexplib0'...
$ git fetch origin ba743ef240b4a83d6236738d638b111e28466281:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-sexplib0
 * [new ref]         ba743ef240b4a83d6236738d638b111e28466281 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba743ef Rebuild OCaml packages for F38