need my new email_validator library during questions

setup/functions.sh

@@ -9,13 +9,15 @@ function hide_output {
 	$@ &> $OUTPUT
 
 	# If the command failed, show the output that was captured in the temporary file.
-	if [ $? != 0 ]; then
+	E=$?
+	if [ $E != 0 ]; then
 		# Something failed.
 		echo
 		echo FAILED: $@
 		echo -----------------------------------------
 		cat $OUTPUT
 		echo -----------------------------------------
+		exit $E
 	fi
 
 	# Remove temporary file.

setup/management.sh

@@ -4,6 +4,7 @@ source setup/functions.sh
 
 apt_install python3-flask links duplicity libyaml-dev python3-dnspython python3-dateutil
 hide_output pip3 install rtyaml "email_validator==0.1.0-rc4"
+	# email_validator is repeated in setup/questions.sh
 
 # Create a backup directory and a random key for encrypting backups.
 mkdir -p $STORAGE_ROOT/backup

setup/questions.sh

@@ -4,7 +4,14 @@ if [ -z "$NONINTERACTIVE" ]; then
 	# e.g. if we piped a bootstrapping install script to bash to get started. In that
 	# case, the nifty '[ -t 0 ]' test won't work. But with Vagrant we must suppress so we
 	# use a shell flag instead. Really supress any output from installing dialog.
-	apt_get_quiet install dialog
+	#
+	# Also install depencies needed to validate the email address.
+	echo Installing packages needed for setup...
+	apt_get_quiet install dialog python3 python3-pip  || exit 1
+
+	# email_validator is repeated in setup/management.sh
+	hide_output pip3 install "email_validator==0.1.0-rc4" || exit 1
+
 	message_box "Mail-in-a-Box Installation" \
 		"Hello and thanks for deploying a Mail-in-a-Box!
 		\n\nI'm going to ask you a few questions.