Devuan-kindof kernelcare installer script

kernelcare_install.sh

#!/bin/bash
#
# KernelCare (https://kernelcare.com/) installation script
# Copyright (c) 2017 CloudLinux Inc. All Rights Reserved
# Unofficial edits by Shawn Holwegner

set -e -o pipefail

repo="https://repo.cloudlinux.com/kernelcare"
name="kernelcare-latest"
distr="debian"
rel="9.0"

if [ -e /etc/os-release ]; then
	distr=$(grep -w 'ID' /etc/os-release | cut -d'=' -f2|tr -d '"')
	if [ "$distr" == "debian" ] || [ "$distr" == "devuan" ] || [ "$distr" == "ubuntu" ]; then
		repo=${repo}-debian
		apt-get -y -q install curl
	else
		yum -y -q install curl
	fi
	#I really don't like their script design, but whatever.
	if [ "$distr" ==  "devuan" ]; then 
		ver=$(grep -w 'PRETTY_NAME' /etc/os-release | cut -d' ' -f3 | grep -oE "[a-z]*")
		if [ "$ver" == "ascii" ]; then rel="9" pkg=${name}-9.deb
		else rel="8" pkg=${name}-8.deb
		fi
	else
		rel=$(grep -w 'VERSION_ID' /etc/os-release | cut -d'.' -f1 | grep -oE "[0-9]*")
	fi

	case $distr in
		"devuan")
			if [ "$rel" -ge "9" ]; then pkg=${name}-9.deb
			elif [ "$rel" -eq "8" ]; then pkg=${name}-8.deb
			else pkg=${name}-6.deb
			fi
		;;
		"debian")
			if [ "$rel" -ge "9" ]; then pkg=${name}-9.deb
			elif [ "$rel" -eq "8" ]; then pkg=${name}-8.deb
			else pkg=${name}-6.deb
			fi
		;;
		"ubuntu")
			if [ "$rel" -ge "14" ]; then pkg=${name}-8.deb
			else pkg=${name}-6.deb
			fi
		;;
		"amzn")
			rel='7'
			pkg=${name}-${rel}.rpm
		;;
		*		)
			pkg=${name}-${rel}.rpm
		;;
	esac

elif [ -e /etc/system-release ]; then
	rel=$(cut -d'.' -f1 /etc/system-release | grep -oE "[0-9]")
	pkg=${name}-${rel}.rpm
else
	rel=$(cut -d'.' -f1 /etc/redhat-release | grep -oE "[0-9]")
	pkg=${name}-${rel}.rpm
fi

cd /root/
curl -O ${repo}/${pkg}

if [ "$distr" == "debian" ] || [ "$distr" == "devuan" ] || [ "$distr" == "ubuntu" ]; then
	dpkg -i $pkg
else
        if [ "$rel" == "5" ]; then
                yum -y localinstall $pkg --nogpgcheck
        else
	        yum -y localinstall $pkg
        fi
fi