$ git clone -n https://src.fedoraproject.org/rpms/ocaml-version.git /var/lib/mock/f42-build-865753-173484/root/chroot_tmpdir/scmroot/ocaml-version
Cloning into '/var/lib/mock/f42-build-865753-173484/root/chroot_tmpdir/scmroot/ocaml-version'...
$ git fetch origin 7b1461d255779918f00feba3f2d2fea77b4c6936:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-version
 * [new ref]         7b1461d255779918f00feba3f2d2fea77b4c6936 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b1461d OCaml 5.3.0 rebuild for Fedora 42