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/py-air-control.nix

@@ -0,0 +1,53 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.py-air-control;
+
+  workingDir = "/var/lib/${cfg.stateDir}";
+
+in
+{
+  port = 9896;
+  extraOpts = {
+    deviceHostname = mkOption {
+      type = types.str;
+      example = "192.168.1.123";
+      description = ''
+        The hostname of the air purification device from which to scrape the metrics.
+      '';
+    };
+    protocol = mkOption {
+      type = types.str;
+      default = "http";
+      description = ''
+        The protocol to use when communicating with the air purification device.
+        Available: [http, coap, plain_coap]
+      '';
+    };
+    stateDir = mkOption {
+      type = types.str;
+      default = "prometheus-py-air-control-exporter";
+      description = ''
+        Directory below <literal>/var/lib</literal> to store runtime data.
+        This directory will be created automatically using systemd's StateDirectory mechanism.
+      '';
+    };
+  };
+  serviceOpts = {
+    serviceConfig = {
+      DynamicUser = false;
+      StateDirectory = cfg.stateDir;
+      WorkingDirectory = workingDir;
+      ExecStart = ''
+        ${pkgs.python3Packages.py-air-control-exporter}/bin/py-air-control-exporter \
+          --host ${cfg.deviceHostname} \
+          --protocol ${cfg.protocol} \
+          --listen-port ${toString cfg.port} \
+          --listen-address ${cfg.listenAddress}
+      '';
+      Environment = [ "HOME=${workingDir}" ];
+    };
+  };
+}