Helios4: Add LED script to mdadm conf generated by OMV

OMV regenerates from its own templates mdadm.conf file therefore 
removing 
the Helios4 mdadm conf tweak we do in the baseline.

Other fixes :

* Make OMV install non-interactive to not display OMV message about 
omv-initsystem since it is already called by this install script.

* Remove decimal to SPACE_NEEDED variable otherwise the size compare 
(test -lt) won't 
work.

* Redirect resolconf -u to /dev/null to hide warning message

debian-software

@@ -579,6 +579,7 @@ read TZ </etc/timezone
 debconf-set-selections <<< "postfix postfix/mailname string ${HOSTNAME}"
 debconf-set-selections <<< "postfix postfix/main_mailer_type string 'No configuration'"
 SPACE_NEEDED=$(apt-get --assume-no --allow-unauthenticated --fix-missing --no-install-recommends install openmediavault postfix dirmngr 2>/dev/null | awk -F" " '/additional disk space will be used/ {print $4}')
+SPACE_NEEDED=${SPACE_NEEDED%.*}
 SPACE_AVAIL=$(df -k / | awk -F" " '/\/$/ {printf ("%0.0f",$4/1200); }')
 if [ ${SPACE_AVAIL} -lt ${SPACE_NEEDED} ]; then
 	dialog --backtitle "$BACKTITLE" --title "No space left on device" --msgbox "\nOpenMediaVault needs ${SPACE_NEEDED} MB for installation while only ${SPACE_AVAIL} MB are available." 7 52
@@ -586,7 +587,7 @@ if [ ${SPACE_AVAIL} -lt ${SPACE_NEEDED} ]; then
 fi
 apt-get --allow-unauthenticated install openmediavault-keyring
 apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 7AA630A1EDEE7D73
-debconf-apt-progress -- apt-get -y --allow-unauthenticated --fix-missing --no-install-recommends \
+DEBIAN_FRONTEND=noninteractive debconf-apt-progress -- apt-get -y --allow-unauthenticated --fix-missing --no-install-recommends \
 	-o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" install openmediavault postfix dirmngr
 # Fix multiple sources entry on ARM with OMV4
 sed -i '/stretch-backports/d' /etc/apt/sources.list
@@ -599,7 +600,7 @@ debconf-apt-progress -- apt-get --yes --force-yes --fix-missing --auto-remove --
 # Install flashmemory plugin and netatalk by default, use nice logo for the latter,
 # disable OMV monitoring by default
 . /usr/share/openmediavault/scripts/helper-functions
-debconf-apt-progress -- apt-get -y --fix-missing --no-install-recommends --auto-remove install openmediavault-flashmemory openmediavault-netatalk
+DEBIAN_FRONTEND=noninteractive debconf-apt-progress -- apt-get -y --fix-missing --no-install-recommends --auto-remove install openmediavault-flashmemory openmediavault-netatalk
 AFP_Options="mimic model = Macmini"
 SMB_Options="min receivefile size = 16384\nwrite cache size = 524288\ngetwd cache = yes\nsocket options = TCP_NODELAY IPTOS_LOWDELAY"
 xmlstarlet ed -L -u "/config/services/afp/extraoptions" -v "$(echo -e "${AFP_Options}")" ${OMV_CONFIG_FILE}
@@ -660,6 +661,16 @@ case ${BOARD} in
 		;;
 esac
 
+# Helios4 tweak
+# Make mdadm display fault events on Fault LED
+if [ ${BOARD} == "helios4" ]; then
+	if [ -f /usr/sbin/mdadm-fault-led.sh ]; then
+		sed -i -e "/HOMEHOST/a \\\n# Trigger Fault Led script when an event is detected\\nPROGRAM \/usr\/sbin\/mdadm-fault-led.sh" /usr/share/openmediavault/mkconf/mdadm
+		/usr/sbin/omv-mkconf mdadm
+	fi
+fi
+
+
 # Add a cron job to make NAS processes more snappy
 systemctl status rsyslog >/dev/null 2>&1
 if [ $? -eq 0 ]; then
@@ -1519,7 +1530,7 @@ fi
 # nameserver backup
 if [ -d /etc/resolvconf/resolv.conf.d ]; then
 	echo 'nameserver 8.8.8.8' > /etc/resolvconf/resolv.conf.d/head
-	resolvconf -u
+	resolvconf -u &> /dev/null
 fi
 
 # Create a safe temporary directory