core-agent-linux/misc/upgrades-status-notify

#!/bin/bash

set -e

upgrades_installed="$(/usr/lib/qubes/upgrades-installed-check 2>&1)"

if [ "$upgrades_installed" = "true" ]; then
   /usr/lib/qubes/qrexec-client-vm dom0 qubes.NotifyUpdates /bin/sh -c 'echo 0'
elif [ "$upgrades_installed" = "false" ]; then
   /usr/lib/qubes/qrexec-client-vm dom0 qubes.NotifyUpdates /bin/sh -c 'echo 1'
fi