$ git clone -n https://src.fedoraproject.org/rpms/ocaml-sexplib.git /var/lib/mock/f45-build-20714-573/root/chroot_tmpdir/scmroot/ocaml-sexplib
Cloning into '/var/lib/mock/f45-build-20714-573/root/chroot_tmpdir/scmroot/ocaml-sexplib'...
$ git fetch origin 24db2885e38f4658a27befcee0887100683aa2ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-sexplib
 * [new ref]         24db2885e38f4658a27befcee0887100683aa2ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24db288 OCaml 5.5.1 rebuild