#!/bin/bash

######################################################################################
####                                                                              ####
#### Version 2.21.020524                                                          ####
#### For questions or comments pconnor@ara.com                                    ####
#### Author : Phil Connor                                                         ####
####                                                                              ####
#### Notes :                                                                      ####
####   This script is a simple "helper" to configure Auto Updates on linux        ####
####   servers.                                                                   ####
####                                                                              ####
######################################################################################

###########################
####  System Variables ####
###########################
if [ "$(command -v lsb_release)" ]; then
    OS=$(lsb_release -i | awk '{print $3}' | tr '[:upper:]' '[:lower:]')
    OSVER=$(lsb_release -r | awk '{print $2}' | awk -F. '{print $1}')
else 
    OS=$(grep PRETTY_NAME /etc/os-release | sed 's/PRETTY_NAME=//g' | tr -d '="' | awk '{print $1}' | tr '[:upper:]' '[:lower:]')
    OSVER=$(grep VERSION_ID /etc/os-release | sed 's/VERSION_ID=//g' | tr -d '="' | awk -F. '{print $1}')
fi

aptcnf="/etc/apt/apt.conf.d"
dnfcnf="/etc/dnf/automatic.conf"
yumcnf="/etc/yum/yum-cron.conf"

###########################################################
#### Detect Package Manger from OS and OSVer Variables ####
########################################################### 
if [[ ${OS} = amazon || ${OS} = red ]]; then
	if [[ ${OSVER} = 2 || ${OSVER} = 7 ]]; then
		PAKMGR="yum -y"
	else
		PAKMGR="dnf -y"
	fi
elif [ "${OS}" = ubuntu ]; then
	PAKMGR="apt -y"
fi

#####################################
#### Install Auto Update Service ####
#####################################
if [[ ${OS} = amazon || ${OS} = red ]]; then
	if [[ ${OSVER} = 2 || ${OSVER} = 7 ]]; then
        ${PAKMGR} update
		${PAKMGR} install yum-cron
        #sed -i 's/update_cmd = default/update_cmd = security/g' $yum7cnf #<-- comment this out for ALL available upgrades
        sed -i 's/apply_updates = no/apply_updates = yes/g' $yumcnf
        sed -i 's/download_updates = no/download_updates = yes/g' $yumcnf
        systemctl enable --now yum-cron 
    fi
	if [[ ${OSVER} = 8 || ${OSVER} = 9 ]]; then
        ${PAKMGR} update
		${PAKMGR} install dnf-automatic 
		sed -i 's/upgrade_type = default/upgrade_type = security/g' $dnfcnf #<-- comment this out for ALL available upgrades
		sed -i 's/apply_updates = no/apply_updates = yes/g' $dnfcnf
		systemctl enable --now dnf-automatic.timer
	fi
elif [ "${OS}" = ubuntu ]; then
    ${PAKMGR} upgrade
	${PAKMGR} install unattended-upgrades
	dpkg-reconfigure --priority=medium unattended-upgrades

    touch $aptcnf/20auto-upgrades
	{
		echo 'APT::Periodic::Update-Package-Lists "1";'
		echo 'APT::Periodic::Download-Upgradeable-Packages "1";'
		echo 'APT::Periodic::AutocleanInterval "7";'
		echo 'APT::Periodic::Unattended-Upgrade "1";'
	} > $aptcnf/20auto-upgrades
fi