#!/bin/bash
#
# Checks for debian updates and informs a gotify server.
#
# MUST RUN AS ROOT (best in a cronjob)
#

MYTEMPDIR="$(mktemp -d)"
MYAPT="$MYTEMPDIR/apt-update.txt"
trap 'rm -rf -- "$MYDIR"' EXIT

apt update > "$MYAPT" 2>&1
MSG=$(tail -1 "$MYAPT")

if [[ $MSG =~ All.packages.are.up.to.date ]]; then
    echo $MSG
else
    SUMMARY=$(echo "$MSG" | awk -F "." '{print $1}')
    LST="$(aptitude -F %p search '~U')"
    LST="$(echo $LST | tr '\n' ' ')"
    text="$SUMMARY ($(uname -n)):\n $LST"
    curl -H "Tags: $(hostname)" -H "Title: Debian Update Check" -H "Icon: https://www.debian.org/logos/openlogo-nd-75.png" -d "Debian update check: $text" https://ntfy.coolify.gaiselmann.de/hetzner
fi