chore: auto optimize biweekly; delete generations older than 90d; use single-definition for stateVersion

flake.nix

@@ -86,6 +86,8 @@
         content = import ./nix/secrets.nix inputs;
       };
 
+      stateVersion = "23.05";
+
       hosts = {
         nom = {
           type = "nixos";

hosts/common/core/nix.nix

@@ -1,6 +1,7 @@
 {
   inputs,
   pkgs,
+  stateVersion,
   ...
 }: {
   environment.etc."nixos/configuration.nix".source = pkgs.writeText "configuration.nix" ''
@@ -32,12 +33,14 @@
       builders-use-substitutes = true
       experimental-features = nix-command flakes recursive-nix
       flake-registry = /etc/nix/registry.json
-      plugin-files = ${pkgs.nix-plugins}/lib/nix/plugins
-      extra-builtins-file = ${../../../nix/extra-builtins.nix}
     '';
     nixPath = ["nixpkgs=/run/current-system/nixpkgs"];
     optimise.automatic = true;
-    gc.automatic = true;
+    gc = {
+      automatic = true;
+      dates = "biweekly";
+      options = "--delete-older-than 90d";
+    };
     # Define global flakes for this system
     registry = {
       nixpkgs.flake = inputs.nixpkgs;
@@ -51,6 +54,6 @@
     extraSystemBuilderCmds = ''
       ln -sv ${pkgs.path} $out/nixpkgs
     '';
-    stateVersion = "23.05";
+    inherit stateVersion;
   };
 }

hosts/common/dev/default.nix

@@ -1,5 +1,8 @@
 {
-  imports = [./documentation.nix];
+  imports = [
+    ./documentation.nix
+    ./nix.nix
+  ];
 
   environment.enableDebugInfo = true;
 }

hosts/common/dev/nix.nix

@@ -0,0 +1,6 @@
+{pkgs, ...}: {
+  nix.extraOptions = ''
+    plugin-files = ${pkgs.nix-plugins}/lib/nix/plugins
+    extra-builtins-file = ${../../../nix/extra-builtins.nix}
+  '';
+}

hosts/common/dev/virt-manager.nix

@@ -1,18 +0,0 @@
-{pkgs, ...}: {
-  environment.systemPackages = with pkgs; [virt-manager spice-gtk swtpm];
-  security.polkit.enable = true;
-  virtualisation = {
-    libvirtd = {
-      enable = true;
-      qemu = {
-        package = pkgs.qemu_kvm;
-        ovmf = {
-          enable = true;
-          packages = with pkgs; [OVMFFull.fd];
-        };
-        swtpm.enable = true;
-      };
-    };
-    spiceUSBRedirection.enable = true;
-  };
-}

nix/generate-installer.nix

@@ -26,7 +26,7 @@
     '';
   in {
     isoImage.isoName = lib.mkForce "nixos-image-${nodeName}.iso";
-    system.stateVersion = "23.05";
+    system.stateVersion = self.stateVersion;
     nix.extraOptions = ''
       experimental-features = nix-command flakes recursive-nix
     '';

nix/generate-node.nix

@@ -19,7 +19,7 @@ in
     pkgs = self.pkgs.${nodeMeta.system};
     specialArgs = {
       inherit (nixpkgs) lib;
-      inherit (self) extraLib nodes;
+      inherit (self) extraLib nodes stateVersion;
       inherit inputs;
       inherit nodeName;
       secrets = self.secrets.content;

users/common/default.nix

@@ -16,7 +16,7 @@
   ];
 
   home = {
-    stateVersion = "23.05";
+    inherit stateVersion;
     packages = with pkgs; [
       bandwhich
       btop