uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/modules/services/search/kibana.nix

@@ -0,0 +1,213 @@
+{ config, lib, options, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.kibana;
+  opt = options.services.kibana;
+
+  ge7 = builtins.compareVersions cfg.package.version "7" >= 0;
+  lt6_6 = builtins.compareVersions cfg.package.version "6.6" < 0;
+
+  cfgFile = pkgs.writeText "kibana.json" (builtins.toJSON (
+    (filterAttrsRecursive (n: v: v != null && v != []) ({
+      server.host = cfg.listenAddress;
+      server.port = cfg.port;
+      server.ssl.certificate = cfg.cert;
+      server.ssl.key = cfg.key;
+
+      kibana.index = cfg.index;
+      kibana.defaultAppId = cfg.defaultAppId;
+
+      elasticsearch.url = cfg.elasticsearch.url;
+      elasticsearch.hosts = cfg.elasticsearch.hosts;
+      elasticsearch.username = cfg.elasticsearch.username;
+      elasticsearch.password = cfg.elasticsearch.password;
+
+      elasticsearch.ssl.certificate = cfg.elasticsearch.cert;
+      elasticsearch.ssl.key = cfg.elasticsearch.key;
+      elasticsearch.ssl.certificateAuthorities = cfg.elasticsearch.certificateAuthorities;
+    } // cfg.extraConf)
+  )));
+
+in {
+  options.services.kibana = {
+    enable = mkEnableOption "kibana service";
+
+    listenAddress = mkOption {
+      description = "Kibana listening host";
+      default = "127.0.0.1";
+      type = types.str;
+    };
+
+    port = mkOption {
+      description = "Kibana listening port";
+      default = 5601;
+      type = types.int;
+    };
+
+    cert = mkOption {
+      description = "Kibana ssl certificate.";
+      default = null;
+      type = types.nullOr types.path;
+    };
+
+    key = mkOption {
+      description = "Kibana ssl key.";
+      default = null;
+      type = types.nullOr types.path;
+    };
+
+    index = mkOption {
+      description = "Elasticsearch index to use for saving kibana config.";
+      default = ".kibana";
+      type = types.str;
+    };
+
+    defaultAppId = mkOption {
+      description = "Elasticsearch default application id.";
+      default = "discover";
+      type = types.str;
+    };
+
+    elasticsearch = {
+      url = mkOption {
+        description = ''
+          Elasticsearch url.
+
+          Defaults to <literal>"http://localhost:9200"</literal>.
+
+          Don't set this when using Kibana >= 7.0.0 because it will result in a
+          configuration error. Use <option>services.kibana.elasticsearch.hosts</option>
+          instead.
+        '';
+        default = null;
+        type = types.nullOr types.str;
+      };
+
+      hosts = mkOption {
+        description = ''
+          The URLs of the Elasticsearch instances to use for all your queries.
+          All nodes listed here must be on the same cluster.
+
+          Defaults to <literal>[ "http://localhost:9200" ]</literal>.
+
+          This option is only valid when using kibana >= 6.6.
+        '';
+        default = null;
+        type = types.nullOr (types.listOf types.str);
+      };
+
+      username = mkOption {
+        description = "Username for elasticsearch basic auth.";
+        default = null;
+        type = types.nullOr types.str;
+      };
+
+      password = mkOption {
+        description = "Password for elasticsearch basic auth.";
+        default = null;
+        type = types.nullOr types.str;
+      };
+
+      ca = mkOption {
+        description = ''
+          CA file to auth against elasticsearch.
+
+          It's recommended to use the <option>certificateAuthorities</option> option
+          when using kibana-5.4 or newer.
+        '';
+        default = null;
+        type = types.nullOr types.path;
+      };
+
+      certificateAuthorities = mkOption {
+        description = ''
+          CA files to auth against elasticsearch.
+
+          Please use the <option>ca</option> option when using kibana &lt; 5.4
+          because those old versions don't support setting multiple CA's.
+
+          This defaults to the singleton list [ca] when the <option>ca</option> option is defined.
+        '';
+        default = if cfg.elasticsearch.ca == null then [] else [ca];
+        defaultText = literalExpression ''
+          if config.${opt.elasticsearch.ca} == null then [ ] else [ ca ]
+        '';
+        type = types.listOf types.path;
+      };
+
+      cert = mkOption {
+        description = "Certificate file to auth against elasticsearch.";
+        default = null;
+        type = types.nullOr types.path;
+      };
+
+      key = mkOption {
+        description = "Key file to auth against elasticsearch.";
+        default = null;
+        type = types.nullOr types.path;
+      };
+    };
+
+    package = mkOption {
+      description = "Kibana package to use";
+      default = pkgs.kibana;
+      defaultText = literalExpression "pkgs.kibana";
+      type = types.package;
+    };
+
+    dataDir = mkOption {
+      description = "Kibana data directory";
+      default = "/var/lib/kibana";
+      type = types.path;
+    };
+
+    extraConf = mkOption {
+      description = "Kibana extra configuration";
+      default = {};
+      type = types.attrs;
+    };
+  };
+
+  config = mkIf (cfg.enable) {
+    assertions = [
+      {
+        assertion = ge7 -> cfg.elasticsearch.url == null;
+        message =
+          "The option services.kibana.elasticsearch.url has been removed when using kibana >= 7.0.0. " +
+          "Please use option services.kibana.elasticsearch.hosts instead.";
+      }
+      {
+        assertion = lt6_6 -> cfg.elasticsearch.hosts == null;
+        message =
+          "The option services.kibana.elasticsearch.hosts is only valid for kibana >= 6.6.";
+      }
+    ];
+    systemd.services.kibana = {
+      description = "Kibana Service";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" "elasticsearch.service" ];
+      environment = { BABEL_CACHE_PATH = "${cfg.dataDir}/.babelcache.json"; };
+      serviceConfig = {
+        ExecStart =
+          "${cfg.package}/bin/kibana" +
+          " --config ${cfgFile}" +
+          " --path.data ${cfg.dataDir}";
+        User = "kibana";
+        WorkingDirectory = cfg.dataDir;
+      };
+    };
+
+    environment.systemPackages = [ cfg.package ];
+
+    users.users.kibana = {
+      isSystemUser = true;
+      description = "Kibana service user";
+      home = cfg.dataDir;
+      createHome = true;
+      group = "kibana";
+    };
+    users.groups.kibana = {};
+  };
+}