Nixpkgs/Reviewing changes: Difference between revisions

@@ Line 129: / Line 129: @@
        type = "app";
        program = "${self.defaultPackage.x86_64-linux}/bin/run-nixos-vm";
+    };
+  };
+}
+</syntaxhighlight>
+==== Testing the cross-compilation of modules ====
+For example
+an improved version can be found at https://github.com/NixOS/nixpkgs/pull/142273#issuecomment-948225922
+<syntaxHighlight lang=console>
+$ nix build .#nixosConfigurations.nixos.config.services.xserver.displayManager.sessionData.desktops
+</syntaxHighlight>
+<syntaxhighlight lang="nix">
+{
+  inputs = {
+    nixpkgs.url = "github:ju1m/nixpkgs/display-managers";
+  };
+  outputs = inputs@{ self, nixpkgs }: {
+    nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
+      system = "x86_64-linux";
+      modules = [
+        ({ pkgs, lib, config, ... }: {
+          nixpkgs.crossSystem = lib.systems.examples.aarch64-multiplatform;
+          services.xserver = {
+            enable = true;
+            desktopManager.session = [
+              { name = "home-manager";
+                start = ''
+                  ${pkgs.runtimeShell} $HOME/.hm-xsession &
+                  waitPID=$!
+                '';
+                bgSupport = true;
+              }
+            ];
+          };
+        })
+      ];
      };
    };
 }
 </syntaxhighlight>