home-manager.useGlobalPkgs: default to true

modules/misc/news/2025/12/2025-12-11_14-45-59.nix

@@ -0,0 +1,11 @@
+{
+  time = "2025-12-11T13:45:59+00:00";
+  condition = true;
+  message = ''
+    BREAKING CHANGE:
+
+    home-manager.useGlobalPkgs is true by default and will become ineffective after 26.11.
+    Using a different set of pkgs for home-manager and nixos has been a constant source of confusion
+    for newcomers and does not make a lot of sense so we are getting rid of this option.
+  '';
+}

modules/modules.nix

@@ -77,7 +77,9 @@ let
 
     (lib.optional useNixpkgsModule ./misc/nixpkgs.nix)
 
-    (lib.optional (!useNixpkgsModule) ./misc/nixpkgs-disabled.nix)
+    (lib.optional (!useNixpkgsModule) (
+      lib.warn "useNixpkgsModule is going to be ineffective after 26.11" ./misc/nixpkgs-disabled.nix
+    ))
 
     (
       if minimal then

nixos/common.nix

@@ -85,10 +85,15 @@ in
       installation of user packages through the
       {option}`users.users.<name>.packages` option'';
 
-    useGlobalPkgs = mkEnableOption ''
-      using the system configuration's `pkgs`
-      argument in Home Manager. This disables the Home Manager
-      options {option}`nixpkgs.*`'';
+    useGlobalPkgs =
+      mkEnableOption
+        ''
+          using the system configuration's `pkgs`
+          argument in Home Manager. This disables the Home Manager
+            options {option}`nixpkgs.*`''
+        {
+          default = true;
+        };
 
     backupCommand = mkOption {
       type = types.nullOr (types.either types.str types.path);