#!/usr/bin/env bash

redhat_derivative () {

    local FILE=/etc/redhat-release

    grep -i 'red.*hat.*enterprise.*linux' $FILE 2>&1 > /dev/null && { echo  DERIVATIVE=rhel; return; }
    grep -i 'red.*hat.*linux' $FILE 2>&1 > /dev/null && { echo DERIVATIVE=rh; return; }
    grep -i 'cern.*e.*linux' $FILE 2>&1 > /dev/null && { echo DERIVATIVE=cel; return; }
    grep -i 'scientific linux cern' $FILE 2>&1 > /dev/null && { echo DERIVATIVE=slc; return; }
    grep -i 'centos' $FILE 2>&1 > /dev/null && { echo DERIVATIVE=centos; return; }

    echo DERIVATIVE=unknown
}

detect_os () {
	#local -n OSinfo="$1" || return 1
	declare -A OSinfo
	OSinfo[MACH]=`uname -m`
	if [ -f /etc/redhat-release ] ; then
		echo DISTRIBUTION=redhat
	    local FILE=/etc/redhat-release
	    grep -i 'red.*hat.*enterprise.*linux' $FILE 2>&1 > /dev/null && { echo  DERIVATIVE=rhel; return; }
	    grep -i 'red.*hat.*linux' $FILE 2>&1 > /dev/null && { echo DERIVATIVE=rh; return; }
	    grep -i 'cern.*e.*linux' $FILE 2>&1 > /dev/null && { echo DERIVATIVE=cel; return; }
	    grep -i 'scientific linux cern' $FILE 2>&1 > /dev/null && { echo DERIVATIVE=slc; return; }
	    grep -i 'centos' $FILE 2>&1 > /dev/null && { echo DERIVATIVE=centos; return; }
		#echo DERIVATIVE=unknown
        echo RELEASE=`tr -d 'a-zA-Z [](){}' < /etc/redhat-release`
    elif [ -s /etc/slackware-version ]; then
        echo DISTRIBUTION="slackware"
	elif [ -f /etc/SUSE-release ] ; then
        # TODO - not tested
        echo DISTRIBUTION=suse
 		echo PSUEDONAME=`cat /etc/SUSE-release | tr "\n" ' '| sed s/VERSION.*//`
 		echo REV=`cat /etc/SUSE-release | tr "\n" ' ' | sed s/.*=\ //`
        echo VERSION=`cat /etc/SuSE-release | grep 'VERSION' | sed  -e 's#[^0-9]##g'`
	elif [ -f /etc/mandrake-release ] ; then
        # TODO - not tested
        echo DISTRIBUTION=mandrake
 		echo PSUEDONAME=`cat /etc/mandrake-release | sed s/.*\(// | sed s/\)//`
 		echo REV=`cat /etc/mandrake-release | sed s/.*release\ // | sed s/\ .*//`
        echo FAMILY=rh
	elif [ -f /etc/debian_version ] ; then
        OSinfo[DISTRIBUTION]=debian
	    if which lsb_release 2>&1 > /dev/null ; then
	        OSinfo[DERIVATIVE]=`lsb_release --id --short 2> /dev/null`
	        OSinfo[RELEASE]=`lsb_release --release --short 2> /dev/null`
	        OSinfo[CODENAME]=`lsb_release --codename --short 2> /dev/null`
	    else
	        OSinfo[DERIVATIVE]=unknown
	        OSinfo[RELEASE]=`cat /etc/debian_version`
	        OSinfo[CODENAME]=unknown
	    fi
    elif [ -f /etc/UnitedLinux-release ]; then
        echo DISTRIBUTION="united"
        echo VERSION=`cat /etc/UnitedLinux-release`
    elif [ -r /etc/init.d/functions.sh ]; then
        # TODO - not tested
        source /etc/init.d/functions.sh
        [ zz`type -t ebegin 2>/dev/null` == "zzfunction" ] && echo DISTRIBUTION="gentoo"
	fi
	#declare -p OSinfo
	echo "${OSinfo[@]}"
}

detect_os