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/incron.nix

@@ -0,0 +1,103 @@
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.incron;
+
+in
+
+{
+  options = {
+
+    services.incron = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable the incron daemon.
+
+          Note that commands run under incrontab only support common Nix profiles for the <envar>PATH</envar> provided variable.
+        '';
+      };
+
+      allow = mkOption {
+        type = types.nullOr (types.listOf types.str);
+        default = null;
+        description = ''
+          Users allowed to use incrontab.
+
+          If empty then no user will be allowed to have their own incrontab.
+          If <literal>null</literal> then will defer to <option>deny</option>.
+          If both <option>allow</option> and <option>deny</option> are null
+          then all users will be allowed to have their own incrontab.
+        '';
+      };
+
+      deny = mkOption {
+        type = types.nullOr (types.listOf types.str);
+        default = null;
+        description = "Users forbidden from using incrontab.";
+      };
+
+      systab = mkOption {
+        type = types.lines;
+        default = "";
+        description = "The system incrontab contents.";
+        example = ''
+          /var/mail IN_CLOSE_WRITE abc $@/$#
+          /tmp IN_ALL_EVENTS efg $@/$# $&
+        '';
+      };
+
+      extraPackages = mkOption {
+        type = types.listOf types.package;
+        default = [];
+        example = literalExpression "[ pkgs.rsync ]";
+        description = "Extra packages available to the system incrontab.";
+      };
+
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+
+    warnings = optional (cfg.allow != null && cfg.deny != null)
+      "If `services.incron.allow` is set then `services.incron.deny` will be ignored.";
+
+    environment.systemPackages = [ pkgs.incron ];
+
+    security.wrappers.incrontab =
+    { setuid = true;
+      owner = "root";
+      group = "root";
+      source = "${pkgs.incron}/bin/incrontab";
+    };
+
+    # incron won't read symlinks
+    environment.etc."incron.d/system" = {
+      mode = "0444";
+      text = cfg.systab;
+    };
+    environment.etc."incron.allow" = mkIf (cfg.allow != null) {
+      text = concatStringsSep "\n" cfg.allow;
+    };
+    environment.etc."incron.deny" = mkIf (cfg.deny != null) {
+      text = concatStringsSep "\n" cfg.deny;
+    };
+
+    systemd.services.incron = {
+      description = "File System Events Scheduler";
+      wantedBy = [ "multi-user.target" ];
+      path = cfg.extraPackages;
+      serviceConfig.PIDFile = "/run/incrond.pid";
+      serviceConfig.ExecStartPre = "${pkgs.coreutils}/bin/mkdir -m 710 -p /var/spool/incron";
+      serviceConfig.ExecStart = "${pkgs.incron}/bin/incrond --foreground";
+    };
+  };
+
+}