$ git clone -n https://src.fedoraproject.org/rpms/ocaml-jst-config.git /var/lib/mock/f42-build-865890-173577/root/chroot_tmpdir/scmroot/ocaml-jst-config
Cloning into '/var/lib/mock/f42-build-865890-173577/root/chroot_tmpdir/scmroot/ocaml-jst-config'...
$ git fetch origin e04dca38111269cf82a198d6073d5fda66806e6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-jst-config
 * [new ref]         e04dca38111269cf82a198d6073d5fda66806e6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e04dca3 OCaml 5.3.0 rebuild for Fedora 42