Add auto-update and maintenance options to system module

configuration.nix

@@ -48,10 +48,13 @@
     # Then add the public key to .sops.yaml
   };
 
-  # === Automatic Updates ===
-  system.autoUpgrade = {
-    enable = true;
-    allowReboot = false;
+  # === System Maintenance & Updates ===
+  myModules.system = {
+    mainUser = "ashie";
+    autoUpdate = {
+      enable = true;
+      allowReboot = false; # Set to true to allow automatic reboots for kernel updates
+    };
   };
 
   system.stateVersion = "23.11";

modules/system.nix

@@ -17,9 +17,72 @@ in
       default = "ashie";
       description = "Main user account for running services";
     };
+
+    autoUpdate = {
+      enable = lib.mkEnableOption "automatic system updates";
+      flake = lib.mkOption {
+        type = lib.types.str;
+        default = "git+ssh://forgejo@git.ashisgreat.xyz:2222/ashie/nixos-vps.git";
+        description = "Flake URI to update from";
+      };
+      dates = lib.mkOption {
+        type = lib.types.str;
+        default = "04:00";
+        description = "Schedule for updates (systemd.timer format)";
+      };
+      allowReboot = lib.mkOption {
+        type = lib.types.bool;
+        default = false;
+        description = "Allow automatic reboots after updates";
+      };
+    };
+
+    maintenance = {
+      gc = {
+        enable = lib.mkOption {
+          type = lib.types.bool;
+          default = true;
+          description = "Enable automatic garbage collection";
+        };
+        dates = lib.mkOption {
+          type = lib.types.str;
+          default = "weekly";
+          description = "Schedule for GC (systemd.timer format)";
+        };
+        olderThan = lib.mkOption {
+          type = lib.types.str;
+          default = "7d";
+          description = "Delete generations older than this";
+        };
+      };
+      optimise = {
+        enable = lib.mkOption {
+          type = lib.types.bool;
+          default = true;
+          description = "Enable automatic Nix store optimisation";
+        };
+      };
+    };
   };
 
   config = {
-    # Nothing here by default - just provides the option
+    # Automatic Updates
+    system.autoUpgrade = lib.mkIf cfg.autoUpdate.enable {
+      enable = true;
+      inherit (cfg.autoUpdate) dates allowReboot flake;
+      flags = [
+        "--update-input"
+        "nixpkgs"
+        "-L" # show logs
+      ];
+    };
+
+    # Nix Maintenance
+    nix.gc = lib.mkIf cfg.maintenance.gc.enable {
+      automatic = true;
+      dates = cfg.maintenance.gc.dates;
+      options = "--delete-older-than ${cfg.maintenance.gc.olderThan}";
+    };
+    nix.optimise.automatic = cfg.maintenance.optimise.enable;
   };
 }