1 files changed, 17 insertions, 12 deletions
diff --git a/nixos/modules/virtualisation/containers.nix b/nixos/modules/virtualisation/containers.nix
index d83841452f95..413aa94339f1 100644
--- a/nixos/modules/virtualisation/containers.nix
+++ b/nixos/modules/virtualisation/containers.nix
@@ -340,6 +340,20 @@ in
                 A specification of the desired configuration of this
                 container, as a NixOS module.
               '';
+              type = lib.mkOptionType {
+                name = "Toplevel NixOS config";
+                merge = loc: defs: (import ../../lib/eval-config.nix {
+                  inherit system;
+                  modules =
+                    let extraConfig =
+                      { boot.isContainer = true;
+                        networking.hostName = mkDefault name;
+                        networking.useDHCP = false;
+                      };
+                    in [ extraConfig ] ++ (map (x: x.value) defs);
+                  prefix = [ "containers" name ];
+                }).config;
+              };
             };
 
             path = mkOption {
@@ -410,18 +424,9 @@ in
           } // networkOptions;
 
           config = mkMerge
-            [ (mkIf options.config.isDefined {
-                path = (import ../../lib/eval-config.nix {
-                  inherit system;
-                  modules =
-                    let extraConfig =
-                      { boot.isContainer = true;
-                        networking.hostName = mkDefault name;
-                        networking.useDHCP = false;
-                      };
-                    in [ extraConfig config.config ];
-                  prefix = [ "containers" name ];
-                }).config.system.build.toplevel;
+            [
+              (mkIf options.config.isDefined {
+                path = config.config.system.build.toplevel;
               })
             ];
         }));