fixes #154

Lets the user stop the install if cancel is selected.

automated install/basic-install.sh

@@ -103,19 +103,24 @@ In the next section, you can choose to use your current network settings (DHCP)
 chooseInterface()
 {
 # Turn the available interfaces into an array so it can be used with a whiptail dialog
-interfacesArray=()
-firstloop=1
+if [[ $chooseInterfaceOptions ]];then
+	interfacesArray=()
+	firstloop=1
 
-while read -r line
-do
-mode="OFF"
-if [[ $firstloop -eq 1 ]]; then
-  firstloop=0
-  mode="ON"
+	while read -r line
+	do
+		mode="OFF"
+		if [[ $firstloop -eq 1 ]]; then
+  		firstloop=0
+  		mode="ON"
+		fi
+		interfacesArray+=("$line" "available" "$mode")
+	done <<< "$availableInterfaces"
+else
+	# Exit if user cancels
+	echo "Cancelling installation."
+	exit
 fi
-interfacesArray+=("$line" "available" "$mode")
-done <<< "$availableInterfaces"
-
 # Find out how many interfaces are available to choose from
 interfaceCount=$(echo "$availableInterfaces" | wc -l)
 chooseInterfaceCmd=(whiptail --separate-output --radiolist "Choose An Interface" $r $c $interfaceCount)
@@ -135,6 +140,7 @@ cmd=(whiptail --separate-output --checklist "Select Protocols" $r $c 2)
 options=(IPv4 "Block ads over IPv4" on
          IPv6 "Block ads over IPv6" off)
 choices=$("${cmd[@]}" "${options[@]}" 2>&1 >/dev/tty)
+if [[ $choices ]];then
 for choice in $choices
 do
     case $choice in
@@ -142,6 +148,11 @@ do
         IPv6)useIPv6=true;;
     esac
 done
+else
+	# Exit if user cancels
+	echo "Cancelling installation."
+	exit
+fi
     if [ $useIPv4 ] && [ ! $useIPv6 ]; then
      	getStaticIPv4Settings
 			setStaticIPv4