add templates for host specific and global overlays

hosts/configuration_desktop.nix

@@ -3,7 +3,7 @@
 #  Host-specific window manager and hardware configs are imported per-host.
 #
 
-{ config, lib, pkgs, pkgs-stable, inputs, user, location, agenix, ... }:
+{ config, lib, pkgs, inputs, user, location, agenix, ... }:
 
 {
   imports = [
@@ -32,7 +32,6 @@
     sbctl
     ausweisapp
     e2fsprogs
-  ] ++ (with pkgs-stable; [
     orca-slicer
   ]);
 

hosts/default.nix

@@ -21,21 +21,23 @@ let
 
   system = "x86_64-linux";
 
-  pkgs = import nixpkgs {
-    inherit system;
-    config.allowUnfree = true;
-  };
-
   pkgs-unstable = import nixpkgs-unstable {
     inherit system;
     config.allowUnfree = true;
   };
 
-  pkgs-stable = pkgs;
-
   pkgs-kabbone = import ../packages {
     inherit system;
-    inherit pkgs;
+    pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };
+  };
+
+  pkgs = import nixpkgs {
+    inherit system;
+    config.allowUnfree = true;
+    # Prefer host-specific overlays over a global one here.
+    # Set nixpkgs.overlays inside the host's own module (e.g. hosts/desktop/default.nix)
+    # so only that host's pkgs is affected. Packages can be imported inline —
+    # no specialArgs needed. See hosts/desktop/default.nix for an example.
   };
 
   # Helper: returns [hm-module, config-attrset] for the modules list.
@@ -55,7 +57,7 @@ in
 {
   hades = lib.nixosSystem {                                # Desktop profile
     inherit system;
-    specialArgs = { inherit inputs pkgs-stable user location nixos-hardware agenix microvm nixpkgs lanzaboote pkgs-kabbone; };
+    specialArgs = { inherit inputs user location nixos-hardware agenix microvm nixpkgs lanzaboote; };
     modules = [
       agenix.nixosModules.default
       microvm.nixosModules.host
@@ -71,7 +73,7 @@ in
 
   lifebook = lib.nixosSystem {                                # Laptop profile
     inherit system;
-    specialArgs = { inherit inputs pkgs-stable user location nixos-hardware agenix lanzaboote; };
+    specialArgs = { inherit inputs user location nixos-hardware agenix lanzaboote; };
     modules = [
       agenix.nixosModules.default
       lanzaboote.nixosModules.lanzaboote
@@ -84,7 +86,7 @@ in
 
   steamdeck = nixpkgs-unstable.lib.nixosSystem {            # steamdeck profile
     inherit system;
-    specialArgs = { inherit inputs pkgs-stable user location nixos-hardware agenix jovian-nixos lanzaboote; };
+    specialArgs = { inherit inputs pkgs user location nixos-hardware agenix jovian-nixos lanzaboote; };
     modules = [
       agenix.nixosModules.default
       jovian-nixos.nixosModules.default
@@ -121,7 +123,7 @@ in
 
   jupiter = lib.nixosSystem {                                # Server profile
     inherit system;
-    specialArgs = { inherit inputs user location nixos-hardware agenix pkgs-kabbone; };
+    specialArgs = { inherit inputs user location nixos-hardware agenix; };
     modules = [
       agenix.nixosModules.default
       ./jupiter

hosts/desktop/default.nix

@@ -2,9 +2,19 @@
 #  Hades desktop — system configuration
 #
 
-{ lib, pkgs, pkgs-kabbone, ... }:
+{ lib, pkgs, inputs, ... }:
 
 {
+  # Example: host-specific overlays — only hades gets these packages in its pkgs.
+  # nixpkgs.overlays = [
+  #   (final: prev: {
+  #     # pull a single package from unstable (no specialArgs needed)
+  #     firefox          = inputs.nixpkgs-unstable.legacyPackages.${prev.system}.firefox;
+  #     # pull a package from pkgs-kabbone (inline import, no specialArgs needed)
+  #     corosync-qdevice = (import ../../packages { pkgs = prev; }).corosync-qdevice;
+  #   })
+  # ];
+
   imports = [
     ./hardware-configuration.nix
     ../../modules/desktop

hosts/home.nix

@@ -15,7 +15,7 @@
 #           └─ default.nix
 #
 
-{ config, lib, pkgs, user, pkgs-stable, ... }:
+{ config, lib, pkgs, user, ... }:
 
 { 
   imports =

hosts/jupiter/default.nix

@@ -17,7 +17,7 @@
 #           └─ default.nix
 #
 
-{ config, pkgs, user, pkgs-kabbone, ... }:
+{ config, pkgs, inputs, user, ... }:
 
 {
   imports =                                                         # For now, if applying to other ssystem, swap files
@@ -39,12 +39,17 @@
     };
   };
 
+# Example: host-specific overlay — only jupiter gets these packages in its pkgs.
+# nixpkgs.overlays = [
+#   (final: prev: {
+#     corosync-qdevice = (import ../../packages { pkgs = prev; }).corosync-qdevice;
+#     firefox          = inputs.nixpkgs-unstable.legacyPackages.${prev.system}.firefox;
+#   })
+# ];
+#
 #  environment = {
-#    systemPackages = with pkgs-kabbone; [
+#    systemPackages = with pkgs; [
 #      corosync-qdevice
-###      simple-scan
-###       intel-media-driver
-###       alacritty
 #    ];
 #  };
 

hosts/kabtop/default.nix

@@ -17,7 +17,7 @@
 #           └─ default.nix
 #
 
-{ config, pkgs, pkgs-unstable, user, agenix, impermanence, ... }:
+{ config, pkgs, user, agenix, impermanence, ... }:
 
 {
   imports =                                                         # For now, if applying to other system, swap files