$ git clone -n https://src.fedoraproject.org/rpms/ocaml-tyxml.git /var/lib/mock/f42-build-865972-173613/root/chroot_tmpdir/scmroot/ocaml-tyxml
Cloning into '/var/lib/mock/f42-build-865972-173613/root/chroot_tmpdir/scmroot/ocaml-tyxml'...
$ git fetch origin ceeec28dea0bec2dd726b45106fa19234bde9165:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-tyxml
 * [new ref]         ceeec28dea0bec2dd726b45106fa19234bde9165 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ceeec28 OCaml 5.3.0 rebuild for Fedora 42