feat: enhance Raspberry Pi setup script with optional skip-install feature and update README instructions

Author: th33k

README.md

@@ -33,12 +33,17 @@ Admin panel: `http://SERVER_IP:3000/admin` (admin@example.com / admin123)
 
 ### 2. Setup Each Raspberry Pi
 
-Each Pi only needs **2 things**: the server IP and its floor number.
+Each Pi only needs **2 things**: the server IP and its floor number.  
+If the machine already has Chromium/X11 installed (e.g. you prepared the VM earlier), you can skip the large browser download with the `--skip-install` option.
 
 ```bash
-# On each Pi — just change the IP and floor number
+# fresh installation (runs package installer)
 sudo bash setup.sh --server http://SERVER_IP:3000 --floor 1
 sudo reboot
+
+# skip network-heavy package install
+sudo bash setup.sh --server http://SERVER_IP:3000 --floor 1 --skip-install
+sudo reboot
 ```
 
 Or remote one-liner:

pi-node/setup.sh

@@ -10,16 +10,19 @@ SERVER_URL=""
 FLOOR_ID=""
 INSTALL_DIR="/opt/display-node"
 
+SKIP_INSTALL=false
 while [[ $# -gt 0 ]]; do
   case $1 in
     --server|--server-url) SERVER_URL="$2"; shift 2;;
     --floor|--floor-id)    FLOOR_ID="$2"; shift 2;;
+    --skip-install)        SKIP_INSTALL=true; shift ;;
     *)                     echo "Unknown option: $1"; exit 1;;
   esac
 done
 
+# validate required options
 if [[ -z "$SERVER_URL" || -z "$FLOOR_ID" ]]; then
-  echo "Usage: sudo bash setup.sh --server <URL> --floor <ID>"
+  echo "Usage: sudo bash setup.sh --server <URL> --floor <ID> [--skip-install]"
   echo "Example: sudo bash setup.sh --server http://192.168.1.50:3000 --floor 1"
   exit 1
 fi
@@ -30,9 +33,20 @@ echo "Floor:  $FLOOR_ID"
 echo ""
 
 # ── 1. Install dependencies ──
-echo "[1/5] Installing packages..."
-apt-get update -qq
-apt-get install -y -qq chromium-browser xserver-xorg x11-xserver-utils xinit openbox unclutter curl
+if ! $SKIP_INSTALL; then
+  echo "[1/5] Installing packages (if missing)..."
+  apt-get update -qq
+  # only install browser if not already present to avoid repeated huge downloads
+  if ! command -v chromium-browser >/dev/null 2>&1; then
+    apt-get install -y -qq chromium-browser
+  else
+    echo "chromium-browser already installed, skipping"
+  fi
+  # the other utilities are small
+  apt-get install -y -qq xserver-xorg x11-xserver-utils xinit openbox unclutter curl
+else
+  echo "[1/5] Skipping package installation as requested"
+fi
 
 # ── 2. Write config (only 2 values needed) ──
 echo "[2/5] Writing config..."