#!/usr/bin/env bash

# configure unattended-upgrades on debian plattforms
# Copyright (C) 2017 Andreas Fendt - All Rights Reserved
# Permission to copy and modify is granted under the MIT license
# Last revised 18.11.2017

# check if root
if [[ $EUID -ne 0 ]]; then
    echo "This script must be run as root" 1>&2
    exit 1
fi

# check if debian
if [ ! "$(grep -Ei 'debian|buntu' /etc/*release)" ]; then
    echo "This script must be run on a debian system" 1>&2
    exit 1
fi

# update system
apt-get update -y
apt-get dist-upgrade -y

# install required packages
apt-get install -y unattended-upgrades apt-listchanges

# configure 50unattended-upgrades
sed -r -i -e "
s/        \"origin=(\\S+),(\\S+),label=(\\S+)-Security\";/\/\/      \"origin=\\1,\\2,label=\\3-Security\";\n        \"o=*\";/g
s/\/\/Unattended-Upgrade::AutoFixInterruptedDpkg \"false\"/Unattended-Upgrade::AutoFixInterruptedDpkg \"true\"/g
s/\/\/Unattended-Upgrade::MinimalSteps \"true\"/Unattended-Upgrade::MinimalSteps \"true\"/g
s/\/\/Unattended-Upgrade::InstallOnShutdown \"true\"/Unattended-Upgrade::InstallOnShutdown \"false\"/g
s/\/\/Unattended-Upgrade::Mail \"root\"/Unattended-Upgrade::Mail \"root\"/g
s/\/\/Unattended-Upgrade::MailOnlyOnError \"true\"/Unattended-Upgrade::MailOnlyOnError \"true\"/g
s/\/\/Unattended-Upgrade::Remove-Unused-Dependencies \"false\"/Unattended-Upgrade::Remove-Unused-Dependencies \"true\"/g
s/\/\/Unattended-Upgrade::Automatic-Reboot \"false\"/Unattended-Upgrade::Automatic-Reboot \"true\"/g
s/\/\/Unattended-Upgrade::Automatic-Reboot-Time \"02:00\"/Unattended-Upgrade::Automatic-Reboot-Time \"02:00\"/g
" /etc/apt/apt.conf.d/50unattended-upgrades

# configure 02periodic
cat > /etc/apt/apt.conf.d/02periodic <<EOL
// Control parameters for cron jobs by /etc/cron.daily/apt //

// Enable the update/upgrade script (0=disable)
APT::Periodic::Enable "1";

// Do "apt-get update" automatically every n-days (0=disable)
APT::Periodic::Update-Package-Lists "1";

// Do "apt-get upgrade --download-only" every n-days (0=disable)
APT::Periodic::Download-Upgradeable-Packages "1";

// Run the "unattended-upgrade" security upgrade script
// every n-days (0=disabled)
// Requires the package "unattended-upgrades" and will write
// a log in /var/log/unattended-upgrades
APT::Periodic::Unattended-Upgrade "1";

// Do "apt-get autoclean" every n-days (0=disable)
APT::Periodic::AutocleanInterval "21";

// Send report mail to root
//     0:  no report             (or null string)
//     1:  progress report       (actually any string)
//     2:  + command outputs     (remove -qq, remove 2>/dev/null, add -d)
//     3:  + trace on
APT::Periodic::Verbose "2";
EOL