$ git clone -n https://src.fedoraproject.org/rpms/ocaml-base.git /var/lib/mock/f42-build-865610-173358/root/chroot_tmpdir/scmroot/ocaml-base
Cloning into '/var/lib/mock/f42-build-865610-173358/root/chroot_tmpdir/scmroot/ocaml-base'...
$ git fetch origin da03ba6233a756721b86698b1eee56159469bdd1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-base
 * [new ref]         da03ba6233a756721b86698b1eee56159469bdd1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da03ba6 OCaml 5.3.0 rebuild for Fedora 42