nixos/gnome-disks: move to programs

nixos/modules/programs/gnome-disks.nix

@@ -0,0 +1,46 @@
+# GNOME Disks.
+
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+{
+
+  # Added 2019-08-09
+  imports = [
+    (mkRenamedOptionModule
+      [ "services" "gnome3" "gnome-disks" "enable" ]
+      [ "programs" "gnome-disks" "enable" ])
+  ];
+
+  ###### interface
+
+  options = {
+
+    programs.gnome-disks = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable GNOME Disks daemon, a program designed to
+          be a UDisks2 graphical front-end.
+        '';
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.programs.gnome-disks.enable {
+
+    environment.systemPackages = [ pkgs.gnome3.gnome-disk-utility ];
+
+    services.dbus.packages = [ pkgs.gnome3.gnome-disk-utility ];
+
+  };
+
+}