$ git clone -n https://src.fedoraproject.org/rpms/ocaml-bos.git /var/lib/mock/f42-build-865892-173577/root/chroot_tmpdir/scmroot/ocaml-bos
Cloning into '/var/lib/mock/f42-build-865892-173577/root/chroot_tmpdir/scmroot/ocaml-bos'...
$ git fetch origin 86029fbd2a923907d22d9c1f31bb23cf3e20aab1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-bos
 * [new ref]         86029fbd2a923907d22d9c1f31bb23cf3e20aab1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86029fb OCaml 5.3.0 rebuild for Fedora 42