Add gui option to kexec-select-boot, use in gui-init menu option

When selecting the boot menu option (m) in the gui-init you call out to
kexec-select-boot. To better maintain the graphical menu experience,
I've added a -g option to kexec-select-boot that, when set, will use a
graphical whiptail menu for the most common menu selection modes.

initrd/bin/gui-init

@@ -82,7 +82,7 @@ while true; do
 	if [ "$totp_confirm" = "m" ]; then
 		# Try to select a kernel from the menu
 		mount_boot
-		kexec-select-boot -m -b /boot -c "grub.cfg"
+		kexec-select-boot -m -b /boot -c "grub.cfg" -g
 		continue
 	fi
 

initrd/bin/kexec-select-boot

@@ -12,7 +12,8 @@ valid_hash="n"
 valid_global_hash="n"
 valid_rollback="n"
 force_menu="n"
-while getopts "b:d:p:a:r:c:uim" arg; do
+gui_menu="n"
+while getopts "b:d:p:a:r:c:uimg" arg; do
 	case $arg in
 		b) bootdir="$OPTARG" ;;
 		d) paramsdev="$OPTARG" ;;
@@ -23,6 +24,7 @@ while getopts "b:d:p:a:r:c:uim" arg; do
 		u) unique="y" ;;
 		m) force_menu="y" ;;
 		i) valid_hash="y"; valid_rollback="y" ;;
+		g) gui_menu="y" ;;
 	esac
 done
 
@@ -80,6 +82,24 @@ get_menu_option() {
 
 	if [ $num_options -eq 1 -a $first_menu = "y" ]; then
 		option_index=1
+	elif [ "$gui_menu" = "y" ]; then
+		MENU_OPTIONS=""
+		n=0
+		while read option
+		do
+			parse_option
+			n=`expr $n + 1`
+			name=$(echo $name | tr " " "_")
+			kernel=$(echo $kernel | cut -f2 -d " ")
+			MENU_OPTIONS="$MENU_OPTIONS $n ${name}_[$kernel]"
+		done < $TMP_MENU_FILE
+
+		whiptail --clear --title "Select your boot option" \
+			--menu "Choose the boot option [1-$n, a to abort]:" 20 120 8 \
+			-- $MENU_OPTIONS \
+			2>/tmp/whiptail || die "Aborting boot attempt"
+
+		option_index=$(cat /tmp/whiptail)
 	else
 		echo "+++ Select your boot option:"
 		n=0
@@ -105,6 +125,14 @@ get_menu_option() {
 }
 
 confirm_menu_option() {
+  if [ "$gui_menu" = "y" ]; then
+		whiptail --clear --title "Confirm boot details" \
+			--menu "Confirm the boot details for $name:\n\n$option\n\n" 20 120 8 \
+			-- 'y' "Boot $name" 'd' "Make $name the default" \
+			2>/tmp/whiptail || die "Aborting boot attempt"
+
+		option_confirm=$(cat /tmp/whiptail)
+  else
 		echo "+++ Please confirm the boot details for $name:"
 		echo $option
 
@@ -113,6 +141,7 @@ confirm_menu_option() {
 			-p "Confirm selection by pressing 'y', make default with 'd': " \
 			option_confirm
 		echo
+  fi
 }
 
 parse_option() {