$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ctypes.git /var/lib/mock/f42-build-865898-173583/root/chroot_tmpdir/scmroot/ocaml-ctypes
Cloning into '/var/lib/mock/f42-build-865898-173583/root/chroot_tmpdir/scmroot/ocaml-ctypes'...
$ git fetch origin b09975d4d57139ee9e202f1fa7028b05b9d4747e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ctypes
 * [new ref]         b09975d4d57139ee9e202f1fa7028b05b9d4747e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b09975d OCaml 5.3.0 rebuild