nova-image: refactoring

The nova image configuration is separated from the image build.

nixos/maintainers/scripts/openstack/nova-image.nix

@@ -0,0 +1,24 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  imports =
+    [ ../../../modules/installer/cd-dvd/channel.nix
+      ../../../modules/virtualisation/nova-config.nix
+    ];
+
+  system.build.novaImage = import ../../../lib/make-disk-image.nix {
+    inherit lib config;
+    pkgs = import ../../../.. { inherit (pkgs) system; }; # ensure we use the regular qemu-kvm package
+    diskSize = 8192;
+    format = "qcow2";
+    configFile = pkgs.writeText "configuration.nix"
+      ''
+        {
+          imports = [ <nixpkgs/nixos/modules/virtualisation/nova-config.nix> ];
+        }
+      '';
+  };
+
+}