fix: Display fallback (#170)

src/display.sh

@@ -6,20 +6,22 @@ set -Eeuo pipefail
 : "${VGA:="ramfb"}"         # VGA adaptor
 : "${DISPLAY:="web"}"       # Display type
 
+[[ "$DISPLAY" == ":0" ]] && DISPLAY="web"
+
 case "${DISPLAY,,}" in
-  vnc)
+  "vnc" )
     DISPLAY_OPTS="-display vnc=:0 -device $VGA"
     ;;
-  web)
+  "web" )
     DISPLAY_OPTS="-display vnc=:0,websocket=5700 -device $VGA"
     ;;
-  ramfb)
+  "ramfb" )
     DISPLAY_OPTS="-display vnc=:0,websocket=5700 -device ramfb"
     ;;
-  disabled)
+  "disabled" )
     DISPLAY_OPTS="-display none -device $VGA"
     ;;
-  none)
+  "none" )
     DISPLAY_OPTS="-display none"
     ;;
   *)

src/network.sh

@@ -177,6 +177,7 @@ configureUser() {
 configureNAT() {
 
   local tuntap="TUN device is missing. $ADD_ERR --device /dev/net/tun"
+  local tables="The 'ip_tables' kernel module is not loaded. Try this command: sudo modprobe ip_tables iptable_nat"
 
   # Create the necessary file structure for /dev/net/tun
   if [ ! -c /dev/net/tun ]; then
@@ -198,8 +199,6 @@ configureNAT() {
     fi
   fi
 
-  local tables="The 'ip_tables' kernel module is not loaded. Try this command: sudo modprobe ip_tables iptable_nat"
-
   # Create a bridge with a static IP for the VM guest
 
   { ip link add dev dockerbridge type bridge ; rc=$?; } || :