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/monitoring/prometheus/exporters/bird.nix

@@ -0,0 +1,50 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.bird;
+in
+{
+  port = 9324;
+  extraOpts = {
+    birdVersion = mkOption {
+      type = types.enum [ 1 2 ];
+      default = 2;
+      description = ''
+        Specifies whether BIRD1 or BIRD2 is in use.
+      '';
+    };
+    birdSocket = mkOption {
+      type = types.path;
+      default = "/run/bird/bird.ctl";
+      description = ''
+        Path to BIRD2 (or BIRD1 v4) socket.
+      '';
+    };
+    newMetricFormat = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Enable the new more-generic metric format.
+      '';
+    };
+  };
+  serviceOpts = {
+    serviceConfig = {
+      SupplementaryGroups = singleton (if cfg.birdVersion == 1 then "bird" else "bird2");
+      ExecStart = ''
+        ${pkgs.prometheus-bird-exporter}/bin/bird_exporter \
+          -web.listen-address ${cfg.listenAddress}:${toString cfg.port} \
+          -bird.socket ${cfg.birdSocket} \
+          -bird.v2=${if cfg.birdVersion == 2 then "true" else "false"} \
+          -format.new=${if cfg.newMetricFormat then "true" else "false"} \
+          ${concatStringsSep " \\\n  " cfg.extraFlags}
+      '';
+      RestrictAddressFamilies = [
+        # Need AF_UNIX to collect data
+        "AF_UNIX"
+      ];
+    };
+  };
+}