setup-network.sh: add menu with hostname change and static IP options, fix SSID extraction quoting using heredoc

spoke/setup-network.sh

@@ -26,9 +26,40 @@ check_deps() {
 
 [ "$(id -u)" -eq 0 ] || die "Run as root"
 
-check_deps ip netplan systemctl ping
+check_deps ip netplan systemctl ping hostnamectl
 
 header "TinyBoard Network Setup"
+echo ""
+echo "  0) Change hostname"
+echo "  1) Configure static IP"
+echo "  q) Quit"
+echo ""
+read -rp "Choose: " NET_OPT
+echo ""
+
+case "$NET_OPT" in
+0)
+    header "Change Hostname"
+    CURRENT_HOSTNAME=$(hostname)
+    echo -e "Current hostname: ${YELLOW}$CURRENT_HOSTNAME${NC}"
+    read -rp "Enter new hostname (e.g. rocky): " NEW_HOSTNAME
+    [ -n "$NEW_HOSTNAME" ] || die "Hostname cannot be empty."
+    [[ "$NEW_HOSTNAME" =~ ^[a-zA-Z0-9._-]+$ ]] || die "Invalid hostname — use only letters, numbers, dots, underscores, hyphens."
+    hostnamectl set-hostname "$NEW_HOSTNAME"
+    echo "$NEW_HOSTNAME" > /etc/hostname
+    sed -i "s/${CURRENT_HOSTNAME}/${NEW_HOSTNAME}/g" /etc/hosts
+    info "Hostname changed to: $NEW_HOSTNAME"
+    exit 0
+    ;;
+1)
+    ;;
+q|Q)
+    exit 0
+    ;;
+*)
+    die "Invalid choice."
+    ;;
+esac
 
 info "Available interfaces:"
 ip -o link show | awk -F': ' 'NR>1 {print "  " $2}'
@@ -98,7 +129,13 @@ if $IS_WIFI; then
     header "WiFi Credentials"
     CURRENT_SSID=""
     if [ -f "$NETPLAN_FILE" ]; then
-        CURRENT_SSID=$(grep -A1 'access-points:' "$NETPLAN_FILE" 2>/dev/null | tail -1 | tr -d ' "' | sed 's/:$//' || true)
+        CURRENT_SSID=$(python3 - "$NETPLAN_FILE" <<'PYEOF'
+import sys, re
+txt = open(sys.argv[1]).read()
+m = re.search(r'access-points:\s*\n\s+["\']{0,1}([^"\':\n]+)["\']{0,1}:', txt)
+print(m.group(1).strip() if m else "")
+PYEOF
+)
     fi
 
     KEEP_WIFI="n"