qubes-core-admin-linux/dom0-updates/qubes-dom0-updates.cron

#!/bin/bash

# Get normal user name 
LOCAL_USER=`users | sed -e 's/root *//' | cut -d' ' -f 1`
PIDFILE=/var/run/qubes/dom0-update-notification.pid
NOTIFY_ICON=/usr/share/qubes/icons/dom0-update-avail.svg
UPDATES_STAT_FILE=/var/lib/qubes/updates/dom0-updates-available

# Do not allow multiple instances
[ -r $PIDFILE ] && kill -0 `cat $PIDFILE` && exit 0
# Teoretically the race can happen here, but this tool will be run once a few
# hours, so no real problem
echo $$ > $PIDFILE
trap "rm $PIDFILE" EXIT

# If no updates available - exit here
qubes-dom0-update --check-only >/dev/null && exit
RETCODE=$?

if [ "$RETCODE" -ne 100 ]; then
    echo "ERROR: Error checking for updates" >&2
    exit $RETCODE
fi

if [ -z "$LOCAL_USER" ]; then
    echo "ERROR: no user logged in, cannot nofity about updates" >&2
    exit 1
fi

# Touch stat file for qubes-manager
touch $UPDATES_STAT_FILE

# Notify about updates using system tray
su -c 'DISPLAY=:0 zenity --notification --window-icon=$NOTIFY_ICON --text="Qubes dom0 updates available."' $LOCAL_USER

su -c 'DISPLAY=:0 zenity --question --title="Qubes Dom0 updates" \
      --text="There are updates for dom0 available, do you want to download them now?"' $LOCAL_USER || exit 0

su -c "DISPLAY=:0 qubes-dom0-update --gui" $LOCAL_USER

# Check if user installed updates
yum -q check-updates && rm $UPDATES_STAT_FILE