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/misc/cgminer.nix

@@ -0,0 +1,148 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.cgminer;
+
+  convType = with builtins;
+    v: if isBool v then boolToString v else toString v;
+  mergedHwConfig =
+    mapAttrsToList (n: v: ''"${n}": "${(concatStringsSep "," (map convType v))}"'')
+      (foldAttrs (n: a: [n] ++ a) [] cfg.hardware);
+  mergedConfig = with builtins;
+    mapAttrsToList (n: v: ''"${n}":  ${if isBool v then "" else ''"''}${convType v}${if isBool v then "" else ''"''}'')
+      cfg.config;
+
+  cgminerConfig = pkgs.writeText "cgminer.conf" ''
+  {
+  ${concatStringsSep ",\n" mergedHwConfig},
+  ${concatStringsSep ",\n" mergedConfig},
+  "pools": [
+  ${concatStringsSep ",\n"
+    (map (v: ''{"url": "${v.url}", "user": "${v.user}", "pass": "${v.pass}"}'')
+          cfg.pools)}]
+  }
+  '';
+in
+{
+  ###### interface
+  options = {
+
+    services.cgminer = {
+
+      enable = mkEnableOption "cgminer, an ASIC/FPGA/GPU miner for bitcoin and litecoin";
+
+      package = mkOption {
+        default = pkgs.cgminer;
+        defaultText = literalExpression "pkgs.cgminer";
+        description = "Which cgminer derivation to use.";
+        type = types.package;
+      };
+
+      user = mkOption {
+        type = types.str;
+        default = "cgminer";
+        description = "User account under which cgminer runs";
+      };
+
+      pools = mkOption {
+        default = [];  # Run benchmark
+        type = types.listOf (types.attrsOf types.str);
+        description = "List of pools where to mine";
+        example = [{
+          url = "http://p2pool.org:9332";
+          username = "17EUZxTvs9uRmPsjPZSYUU3zCz9iwstudk";
+          password="X";
+        }];
+      };
+
+      hardware = mkOption {
+        default = []; # Run without options
+        type = types.listOf (types.attrsOf (types.either types.str types.int));
+        description= "List of config options for every GPU";
+        example = [
+        {
+          intensity = 9;
+          gpu-engine = "0-985";
+          gpu-fan = "0-85";
+          gpu-memclock = 860;
+          gpu-powertune = 20;
+          temp-cutoff = 95;
+          temp-overheat = 85;
+          temp-target = 75;
+        }
+        {
+          intensity = 9;
+          gpu-engine = "0-950";
+          gpu-fan = "0-85";
+          gpu-memclock = 825;
+          gpu-powertune = 20;
+          temp-cutoff = 95;
+          temp-overheat = 85;
+          temp-target = 75;
+        }];
+      };
+
+      config = mkOption {
+        default = {};
+        type = types.attrsOf (types.either types.bool types.int);
+        description = "Additional config";
+        example = {
+          auto-fan = true;
+          auto-gpu = true;
+          expiry = 120;
+          failover-only = true;
+          gpu-threads = 2;
+          log = 5;
+          queue = 1;
+          scan-time = 60;
+          temp-histeresys = 3;
+        };
+      };
+    };
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.services.cgminer.enable {
+
+    users.users = optionalAttrs (cfg.user == "cgminer") {
+      cgminer = {
+        isSystemUser = true;
+        group = "cgminer";
+        description = "Cgminer user";
+      };
+    };
+    users.groups = optionalAttrs (cfg.user == "cgminer") {
+      cgminer = {};
+    };
+
+    environment.systemPackages = [ cfg.package ];
+
+    systemd.services.cgminer = {
+      path = [ pkgs.cgminer ];
+
+      after = [ "network.target" "display-manager.service" ];
+      wantedBy = [ "multi-user.target" ];
+
+      environment = {
+        LD_LIBRARY_PATH = "/run/opengl-driver/lib:/run/opengl-driver-32/lib";
+        DISPLAY = ":${toString config.services.xserver.display}";
+        GPU_MAX_ALLOC_PERCENT = "100";
+        GPU_USE_SYNC_OBJECTS = "1";
+      };
+
+      startLimitIntervalSec = 60;  # 1 min
+      serviceConfig = {
+        ExecStart = "${pkgs.cgminer}/bin/cgminer --syslog --text-only --config ${cgminerConfig}";
+        User = cfg.user;
+        RestartSec = "30s";
+        Restart = "always";
+      };
+    };
+
+  };
+
+}