nixos/patroni: assert on conflicts with postgresql.dataDir (#413776)

  };

  config = lib.mkIf cfg.enable {

    assertions = [

      {

        assertion =

          !(

            cfg.enable

            && config.services.postgresql.enable

            && cfg.postgresqlDataDir == config.services.postgresql.dataDir

          );

        message = ''

          Both services.patroni and services.postgresql are enabled and

          services.patroni.postgresqlDataDir == services.postgresql.dataDir

          Disable one or the other, or configure them to use different directories.

        '';

      }

    ];

    services.patroni.settings = {

      scope = cfg.scope;