$ git clone -n https://src.fedoraproject.org/rpms/ocaml-octavius.git /var/lib/mock/f40-build-2013465-45888/root/chroot_tmpdir/scmroot/ocaml-octavius
Cloning into '/var/lib/mock/f40-build-2013465-45888/root/chroot_tmpdir/scmroot/ocaml-octavius'...
$ git fetch origin 57c2db0a72cdf1e4556171698a8236b20b4ff34a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-octavius
 * [new ref]         57c2db0a72cdf1e4556171698a8236b20b4ff34a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57c2db0 OCaml 5.1.1 rebuild for Fedora 40