unattended upgrades

configuration.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }: {
+{ pkgs, ... }@inputs: {
   imports = [ ./hardware-configuration.nix ];
 
   nix.settings = {
@@ -12,6 +12,19 @@
     options = "--delete-older-than 30d";
   };
 
+  system.autoUpgrade = {
+    enable = true;
+    flake = inputs.self.outPath;
+    flags = [
+      "--update-input"
+      "nixpkgs"
+      "--no-write-lock-file"
+      "-L" # print build logs
+    ];
+    dates = "02:00";
+    randomizedDelaySec = "45min";
+  };
+
   environment.systemPackages = with pkgs; [
     kitty.terminfo
     kakoune

flake.nix

@@ -14,6 +14,7 @@
         };
       in import nixpkgs cfg;
 
+      specialArgs = attrs;
       modules = [
         ./configuration.nix