Add cdemu packages and module

nixos/modules/services/hardware/cdemu.nix

@@ -0,0 +1,49 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.cdemu;
+in {
+
+  options = {
+    services.cdemu = {
+      enable = mkOption {
+        default = false;
+	description = "Whether to enable cdemu for users of appropriate group (default cdrom)";
+      };
+      group = mkOption {
+        default = "cdrom";
+	description = "Required group for users of cdemu";
+      };
+      gui = mkOption {
+        default = true;
+	description = "Whether to install cdemu GUI (gCDEmu)";
+      };
+      image-analyzer = mkOption {
+        default = true;
+	description = "Whether to install image analyzer";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+  
+    boot = {
+      extraModulePackages = [ pkgs.linuxPackages.vhba ];
+      kernelModules = [ "vhba" ];
+    };
+    
+    services = {
+      udev.extraRules = ''
+        KERNEL=="vhba_ctl", MODE="0660", OWNER="root", GROUP="${cfg.group}"
+      '';
+      dbus.packages = [ pkgs.cdemu-daemon ];
+    };
+    
+    environment.systemPackages =
+      [ pkgs.cdemu-daemon pkgs.cdemu-client ]
+      ++ optional cfg.gui pkgs.gcdemu
+      ++ optional cfg.image-analyzer pkgs.image-analyzer;
+  };
+  
+}