Update configuration.nix

configuration.nix

@@ -1,4 +1,4 @@
-# NixOS USB configuration with auto-update from public Git repo
+# NixOS USB system with auto-update from public Git repo
 # Repo: https://git.skarockoi.de/ska/nixos-production.git
 
 { config, pkgs, ... }:
@@ -64,13 +64,12 @@ in
     git
     curl
     wget
-    sl
-    nano
-    openssh  # optional, for scp etc.
-    thunderbird
+    vim
+    openssh
     obsidian
     libreoffice
     keepassxc
+    thunderbird
     tor-browser
     inkscape
     gimp
@@ -83,12 +82,14 @@ in
 
   programs.firefox.enable = true;
 
-  # === Auto-update script: fetch config from public Git repo ===
+  # === Auto-update script with proper NIX_PATH for systemd ===
   environment.etc."update-nixos-config.sh".text = ''
     #!/run/current-system/sw/bin/bash
     set -e
 
-    export PATH="${pkgs.git}/bin:${pkgs.nix}/bin:/run/current-system/sw/bin"
+    # Critical: set NIX_PATH so nixos-rebuild can find <nixpkgs/nixos>
+    export NIX_PATH="nixpkgs=/run/current-system/nixos"
+    export PATH="/run/current-system/sw/bin:/nix/var/nix/profiles/default/bin"
 
     LOCAL_PATH="${gitLocalPath}"
     REPO_URL="${gitRepoUrl}"
@@ -116,7 +117,7 @@ in
   '';
   environment.etc."update-nixos-config.sh".mode = "0700";
 
-  # === Systemd timer for automatic updates ===
+  # === Systemd timer: boot + hourly ===
   systemd.services.nixos-git-update = {
     description = "Update NixOS from public Git config";
     script = "/etc/update-nixos-config.sh";