# wget https://gist.githubusercontent.com/waja/d9e176f712ae6a6e4442486df80a13ba/raw/deploy_unattended-upgrades.sh -O /tmp/a && sh /tmp/a
apt-get -y install unattended-upgrades && \
cat > /etc/apt/apt.conf.d/10periodic <<EOF
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "1";
APT::Periodic::AutocleanInterval "7";
APT::Periodic::Unattended-Upgrade "1";
EOF
sed -i 's#//      "o=Debian,n=jessie"#        "o=Debian,n=jessie"#' /etc/apt/apt.conf.d/50unattended-upgrades && \
sed -i 's#//      "o=Debian,n=jessie-updates"#        "o=Debian,n=jessie-updates"#' /etc/apt/apt.conf.d/50unattended-upgrades && \
sed -i 's#//Unattended-Upgrade::Remove-Unused-Dependencies "false"#Unattended-Upgrade::Remove-Unused-Dependencies "true"#' /etc/apt/apt.conf.d/50unattended-upgrades && \
sed -i 's#//Unattended-Upgrade::Automatic-Reboot "false"#Unattended-Upgrade::Automatic-Reboot "true"#' /etc/apt/apt.conf.d/50unattended-upgrades && \
sed -i 's#//Unattended-Upgrade::Automatic-Reboot-Time "02:00"#Unattended-Upgrade::Automatic-Reboot-Time "04:00"#' /etc/apt/apt.conf.d/50unattended-upgrades
DIST=$(lsb_release -c | cut -f 2); [ "${DIST}" != "jessie" ] && sed -i "s/jessie/${DIST}/g" /etc/apt/apt.conf.d/50unattended-upgrades
# prevent updating some core packages which requires reboot
if [ "${1}" = "--crit" ]; then
        for PACKAGE in libc6* linux-image-* openssl* xen* libxen* qemu* libvirt*; do                                 
                sed -i -E "s#//\t\"vim\";#\t\"${PACKAGE}\";\n//\t\"vim\";#" /etc/apt/apt.conf.d/50unattended-upgrades
        done
        sed -i 's#Unattended-Upgrade::Automatic-Reboot "true"#//Unattended-Upgrade::Automatic-Reboot "false"#' /etc/apt/apt.conf.d/50unattended-upgrades
fi
exit 0
# in case you need a mail notification
[ $(grep ^//Unattended-Upgrade::Mail /etc/apt/apt.conf.d/50unattended-upgrades | grep -c -v MailOnlyOnError) -gt 0 ] && \
  sed -i 's#//Unattended-Upgrade::Mail "root";#Unattended-Upgrade::Mail "user@domain.tld";#g' /etc/apt/apt.conf.d/50unattended-upgrades