$ git clone -n https://src.fedoraproject.org/rpms/ocaml-base64.git /var/lib/mock/f39-build-1598970-38511/root/chroot_tmpdir/scmroot/ocaml-base64
Cloning into '/var/lib/mock/f39-build-1598970-38511/root/chroot_tmpdir/scmroot/ocaml-base64'...
$ git fetch origin 1891d6560da24575b29247796f54626625b5ab9d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-base64
 * [new ref]         1891d6560da24575b29247796f54626625b5ab9d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1891d65 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild