$ git clone -n https://src.fedoraproject.org/rpms/ocaml-xmlm.git /var/lib/mock/f42-build-865641-173376/root/chroot_tmpdir/scmroot/ocaml-xmlm
Cloning into '/var/lib/mock/f42-build-865641-173376/root/chroot_tmpdir/scmroot/ocaml-xmlm'...
$ git fetch origin 9662c6f8ea1c81e98b7d3f1c880d7029c1dc817c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-xmlm
 * [new ref]         9662c6f8ea1c81e98b7d3f1c880d7029c1dc817c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9662c6f OCaml 5.3.0 rebuild for Fedora 42