$ git clone -n https://src.fedoraproject.org/rpms/ocaml-base64.git /var/lib/mock/f45-build-20455-570/root/chroot_tmpdir/scmroot/ocaml-base64
Cloning into '/var/lib/mock/f45-build-20455-570/root/chroot_tmpdir/scmroot/ocaml-base64'...
$ git fetch origin e7155fe2c566dd0409b423e4aa5074c51d44c6eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-base64
 * [new ref]         e7155fe2c566dd0409b423e4aa5074c51d44c6eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7155fe OCaml 5.5.1 rebuild