Update git-auto-update.nix

git-auto-update.nix

@@ -5,7 +5,7 @@
     mode = "0700";
     text = ''
       #!/run/current-system/sw/bin/bash
-      set -e
+      set -euo pipefail
 
       export PATH="/run/current-system/sw/bin:/nix/var/nix/profiles/default/bin"
       export NIX_PATH="nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos"
@@ -17,24 +17,19 @@
         mkdir -p "$LOCAL_PATH"
         chmod 700 "$LOCAL_PATH"
         git clone "$REPO_URL" "$LOCAL_PATH"
-        exit 0
-      fi
-
+      else
         cd "$LOCAL_PATH"
-
         git fetch origin
-      LOCAL_HEAD=$(git rev-parse HEAD)
-      REMOTE_HEAD=$(git rev-parse origin/main)
-
-      if [ "$LOCAL_HEAD" != "$REMOTE_HEAD" ]; then
         git reset --hard origin/main
-        nixos-rebuild boot -I nixos-config="$LOCAL_PATH/configuration.nix"
       fi
+
+      # Always rebuild — nixos-rebuild will do nothing if system is already up-to-date
+      nixos-rebuild boot -I nixos-config="$LOCAL_PATH/configuration.nix"
     '';
   };
 
   systemd.services.nix-git-auto-update = {
-    description = "Automatically update NixOS from Git";
+    description = "Automatically update NixOS from Git (always rebuild)";
     script = "/etc/nix-git-auto-update.sh";
     serviceConfig = {
       Type = "oneshot";
@@ -48,7 +43,7 @@
   };
 
   systemd.timers.nix-git-auto-update = {
-    description = "Periodic NixOS Git update check";
+    description = "Periodic NixOS Git update check (always rebuild)";
     wantedBy = [ "timers.target" ];
     timerConfig = {
       OnBootSec = "60s";