$ git clone -n https://src.fedoraproject.org/rpms/ocaml-base64.git /var/lib/mock/f31-build-46986-26762/root/chroot_tmpdir/scmroot/ocaml-base64
Cloning into '/var/lib/mock/f31-build-46986-26762/root/chroot_tmpdir/scmroot/ocaml-base64'...
$ git reset --hard 9e2155b31b27f50da7a680f95fef42263f2fad90
HEAD is now at 9e2155b OCaml 4.08.0 (final) rebuild.