Show all missing env vars with usage when install.sh is run without required variables

install.sh

@@ -15,10 +15,27 @@ err() { echo -e "${RED}[!!]${NC} $*"; exit 1; }
 PROJECT_DIR="/home/wall/vacuum-wall"
 USER_NAME="vacuum-wall"
 USER_HOME="/home/$USER_NAME"
-DOMAIN="${MGMT_DOMAIN:?ERROR: Set MGMT_DOMAIN env var (e.g., wall.lan)}"
+# --- Validate required env vars ---
+missing=()
+[[ -z "${MGMT_DOMAIN:-}" ]] && missing+=(MGMT_DOMAIN)
+[[ -z "${MGMT_PASS:-}" ]]   && missing+=(MGMT_PASS)
+[[ -z "${ACME_EMAIL:-}" ]]  && missing+=(ACME_EMAIL)
+
+if (( ${#missing[@]} )); then
+  echo -e "${RED}[!!]${NC} Missing required environment variables:"
+  for v in "${missing[@]}"; do
+    case "$v" in
+      MGMT_DOMAIN) echo '  export MGMT_DOMAIN="wall.lan"      # Management UI hostname';;
+      MGMT_PASS)   echo '  export MGMT_PASS="your-password"  # WebUI basic auth password';;
+      ACME_EMAIL)  echo "  export ACME_EMAIL=\"you@example.com\"  # Let's Encrypt email";;
+    esac
+  done
+  printf '\nTo run: MGMT_DOMAIN=wall.lan MGMT_PASS=pass ACME_EMAIL=you@example.com ./install.sh\n'
+  exit 1
+fi
+
+DOMAIN="$MGMT_DOMAIN"
 MGMT_USER="${MGMT_USER:-admin}"
-MGMT_PASS="${MGMT_PASS:?ERROR: Set MGMT_PASS env var for WebUI basic auth}"
-ACME_EMAIL="${ACME_EMAIL:?ERROR: Set ACME_EMAIL env var for Let's Encrypt}"
 
 # --- Pre-flight checks ---
 [[ $EUID -eq 0 ]] || err "This script must be run as root."