Update configuration.nix

configuration.nix

@@ -41,7 +41,7 @@
   };
 
   ############################################################
-  # FIRMWARE – WIDE HARDWARE SUPPORT
+  # FIRMWARE
   ############################################################
 
   hardware.enableAllFirmware = true;
@@ -51,7 +51,7 @@
   hardware.cpu.amd.updateMicrocode = true;
 
   ############################################################
-  # FILESYSTEMS – BASED ON LABELS
+  # FILESYSTEMS
   ############################################################
 
   fileSystems."/" = {
@@ -65,7 +65,7 @@
   };
 
   ############################################################
-  # NETWORKING
+  # NETWORKING / LOCALE
   ############################################################
 
   networking.networkmanager.enable = true;
@@ -82,7 +82,7 @@
   services.blueman.enable = true;
 
   ############################################################
-  # DESKTOP – GNOME
+  # DESKTOP
   ############################################################
 
   services.displayManager.gdm.enable = true;
@@ -90,7 +90,7 @@
   services.libinput.enable = true;
 
   ############################################################
-  # AUDIO – PIPEWIRE
+  # AUDIO
   ############################################################
 
   services.pulseaudio.enable = false;
@@ -133,12 +133,6 @@
     curl
     wget
     openssh
-
-    gnomeExtensions.apps
-    gnomeExtensions.window-list
-    gnomeExtensions.dock-from-dash
-    gnomeExtensions.places-status-indicator
-    
     obsidian
     libreoffice
     keepassxc
@@ -152,14 +146,61 @@
   programs.firefox.enable = true;
 
   ############################################################
-  # GIT AUTO‑UPDATE SCRIPT
+  # PORTABLE USB‑ROOT LOSS → SHUTDOWN
+  ############################################################
+
+  systemd.services.shutdown-on-root-usb-loss = {
+    description = "Shutdown if USB device backing / disappears";
+    wantedBy = [ "multi-user.target" ];
+    after = [ "local-fs.target" ];
+
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = pkgs.writeShellScript "watch-root-usb" ''
+        set -e
+
+        ROOT_SRC="$(findmnt -n -o SOURCE / || true)"
+        [ -z "$ROOT_SRC" ] && exit 0
+
+        if [[ "$ROOT_SRC" == /dev/dm-* ]]; then
+          PARENT="$(lsblk -no PKNAME "$ROOT_SRC")"
+          ROOT_DEV="/dev/$PARENT"
+        else
+          ROOT_DEV="$ROOT_SRC"
+        fi
+
+        TRAN="$(lsblk -no TRAN "$ROOT_DEV" || true)"
+        [ "$TRAN" != "usb" ] && exec sleep infinity
+
+        DEV_NAME="$(basename "$ROOT_DEV")"
+
+        while [ -e "/sys/class/block/$DEV_NAME" ]; do
+          sleep 1
+        done
+
+        systemctl poweroff
+      '';
+      Restart = "no";
+    };
+  };
+
+  ############################################################
+  # KERNEL FAILSAFE
+  ############################################################
+
+  boot.kernel.sysctl = {
+    "kernel.panic" = 5;
+    "kernel.panic_on_oops" = 1;
+  };
+
+  ############################################################
+  # GIT AUTO‑UPDATE
   ############################################################
 
   environment.etc."update-nixos-config.sh".text = ''
     #!/run/current-system/sw/bin/bash
     set -e
 
-    # Ensure all system tools are available
     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"
 
@@ -169,38 +210,28 @@
     if [ ! -d "$LOCAL_PATH/.git" ]; then
       mkdir -p "$LOCAL_PATH"
       chmod 700 "$LOCAL_PATH"
-      echo "Cloning config from $REPO_URL..."
       git clone "$REPO_URL" "$LOCAL_PATH"
     else
       cd "$LOCAL_PATH"
-      echo "Fetching updates..."
       git fetch origin
-      LOCAL_HEAD=$(git rev-parse HEAD)
+      if [ "$(git rev-parse HEAD)" != "$(git rev-parse origin/main)" ]; then
-      REMOTE_HEAD=$(git rev-parse origin/main)
-      if [ "$LOCAL_HEAD" != "$REMOTE_HEAD" ]; then
-        echo "New config available. Updating..."
         git reset --hard origin/main
         nixos-rebuild switch -I nixos-config="$LOCAL_PATH/configuration.nix"
-        echo "System updated successfully."
-      else
-        echo "Config is already up to date."
       fi
     fi
   '';
   environment.etc."update-nixos-config.sh".mode = "0700";
 
   systemd.services.nixos-git-update = {
-    description = "Update NixOS from public Git config";
+    description = "Update NixOS from Git";
     script = "/etc/update-nixos-config.sh";
     serviceConfig = {
       Type = "oneshot";
       User = "root";
-      Group = "root";
     };
   };
 
   systemd.timers.nixos-git-update = {
-    description = "Check for config updates at startup";
     wantedBy = [ "timers.target" ];
     timerConfig = {
       OnBootSec = "60s";
@@ -208,25 +239,13 @@
   };
 
   ############################################################
-  # USB OPTIMIZATIONS
+  # SWAP
   ############################################################
 
   zramSwap.enable = true;
 
   ############################################################
-  # USB ROOT DEVICE MONITOR (SHUTDOWN ON DISCONNECT)
+  # VERSION
-  ############################################################
-
-  # Monitor root device removal and shut down
-  services.udev.extraRules = ''
-    # Match the root filesystem device by label (or use PARTLABEL/UUID if preferred)
-    KERNEL=="sd*", ENV{ID_FS_LABEL}=="nixos-root", SYMLINK+="nixos-root-device"
-    # Trigger when the root device is removed
-    ACTION=="remove", KERNEL=="sd*", ENV{ID_FS_LABEL}=="nixos-root", RUN+="/run/current-system/sw/bin/systemctl poweroff"
-  '';
-
-  ############################################################
-  # NIXOS VERSION
   ############################################################
 
   system.stateVersion = "25.11";