#!/bin/sh
# Author: Vitaly Lipatov <lav@etersoft.ru>
# 2007, 2009, 2010, 2012 (c) Etersoft
# 2007 Public domain

# Detect the distro and version
# Welcome to send updates!

# You can set ROOTDIR to root system dir
#ROOTDIR=

# Check for DISTRO specific file in /etc
distro()
{
	#[ -n "$ROOTDIR" ] || return
	# fill global DISTROFILE
	DISTROFILE="$ROOTDIR/etc/$1"
	[ -f "$DISTROFILE" ]
}

# Has a distro file the specified word?
has()
{
	[ -n "$DISTROFILE" ] || exit 1
	grep "$*" "$DISTROFILE" >/dev/null 2>&1
}

# Translate DISTRIB_ID to vendor name (like %_vendor does)
rpmvendor()
{
	[ "$DISTRIB_ID" = "ALTLinux" ] && echo "alt" && return
	[ "$DISTRIB_ID" = "AstraLinux" ] && echo "astra" && return
	[ "$DISTRIB_ID" = "LinuxXP" ] && echo "lxp" && return
	[ "$DISTRIB_ID" = "TinyCoreLinux" ] && echo "tcl" && return
	echo "$DISTRIB_ID" | tr "[A-Z]" "[a-z]"
}

# Translate DISTRIB_ID name to package manner (like in the package release name)
pkgvendor()
{
	[ "$DISTRIB_ID" = "Mandriva" ] && echo "mdv" && return
	rpmvendor
}

# Print pkgtype (need DISTRIB_ID var)
pkgtype()
{
    case `pkgvendor` in
		freebsd) echo "tbz" ;;
		sunos) echo "pkg.gz" ;;
		slackware|mopslinux) echo "tgz" ;;
		archlinux) echo "pkg.tar.xz" ;;
		gentoo) echo "tbz2" ;;
		windows) echo "exe" ;;
		android) echo "apk" ;;
		alpine) echo "apk" ;;
		tinycorelinux) echo "tcz" ;;
		cygwin) echo "tar.xz" ;;
		debian|ubuntu|mint|runtu|mcst|astra) echo "deb" ;;
		alt|asplinux|suse|mandriva|rosa|mandrake|pclinux|sled|sles)
			echo "rpm" ;;
		fedora|redhat|scientific|centos|rhel)
			echo "rpm" ;;
		*)  echo "rpm" ;;
	esac
}

get_var()
{
	grep -i "^$1 *=" | head -n 1 | sed -e "s/^[^=]*[ \t]*=[ \t]*//"

}

# 2010.1 -> 2010
get_major_version()
{
	echo "$1" | sed -e "s/\..*//g"
}

# Default values
DISTRIB_ID="Generic"
DISTRIB_RELEASE=""
DISTRIB_CODENAME=""

# Default with LSB
if distro lsb-release ; then
	DISTRIB_ID=`cat $DISTROFILE | get_var DISTRIB_ID`
	DISTRIB_RELEASE=`cat $DISTROFILE | get_var DISTRIB_RELEASE`
	DISTRIB_CODENAME=`cat $DISTROFILE | get_var DISTRIB_CODENAME`
fi

# ALT Linux based
if distro altlinux-release ; then
	DISTRIB_ID="ALTLinux"
	if has Sisyphus ; then DISTRIB_RELEASE="Sisyphus"
	elif has "ALT Linux 7." ; then DISTRIB_RELEASE="p7"
	elif has "ALT Linux 8." ; then DISTRIB_RELEASE="p8"
	elif has "Simply Linux 6." ; then DISTRIB_RELEASE="p6"
	elif has "Simply Linux 7." ; then DISTRIB_RELEASE="p7"
	elif has "Simply Linux 8." ; then DISTRIB_RELEASE="p8"
	elif has "ALT Linux 6." ; then DISTRIB_RELEASE="p6"
	elif has "ALT Linux p8"  ; then DISTRIB_RELEASE="p8"
	elif has "ALT Linux p7"  ; then DISTRIB_RELEASE="p7"
	elif has "ALT Linux p6"  ; then DISTRIB_RELEASE="p6"
	elif has "ALT Linux p5"  ; then DISTRIB_RELEASE="p5"
	elif has "ALT Linux 5.1" ; then DISTRIB_RELEASE="5.1"
	elif has "ALT Linux 5.0" ; then DISTRIB_RELEASE="5.0"
	elif has "ALT Linux 4.1" ; then DISTRIB_RELEASE="4.1"
	elif has "ALT Linux 4.0" ; then DISTRIB_RELEASE="4.0"
	elif has Walnut          ; then DISTRIB_RELEASE="4.0"
	elif has 20070810 ; then DISTRIB_RELEASE="4.0"
	elif has Ajuga    ; then DISTRIB_RELEASE="4.0"
	elif has 20050723 ; then DISTRIB_RELEASE="3.0"
	elif has Citron   ; then DISTRIB_RELEASE="2.4"
	fi

elif [ `uname -o` = "Cygwin" ] ; then
        DISTRIB_ID="Cygwin"
        DISTRIB_RELEASE="all"

elif distro gentoo-release ; then
	DISTRIB_ID="Gentoo"
	MAKEPROFILE=$(readlink $ROOTDIR/etc/portage/make.profile 2>/dev/null) || MAKEPROFILE=$(readlink $ROOTDIR/etc/make.profile)
	DISTRIB_RELEASE=`basename $MAKEPROFILE`
	echo $DISTRIB_RELEASE | grep -q "[0-9]" || DISTRIB_RELEASE=`basename $(dirname $MAKEPROFILE)`

# Slackware based
elif distro mopslinux-version ; then
	DISTRIB_ID="MOPSLinux"
	if   has 4.0 ; then DISTRIB_RELEASE="4.0"
	elif has 5.0 ; then DISTRIB_RELEASE="5.0"
	elif has 5.1 ; then DISTRIB_RELEASE="5.1"
	elif has 6.0 ; then DISTRIB_RELEASE="6.0"
	elif has 6.1 ; then DISTRIB_RELEASE="6.1"
	fi
elif distro slackware-version ; then
	DISTRIB_ID="Slackware"
	DISTRIB_RELEASE="$(grep -Eo [0-9]+\.[0-9]+ $DISTROFILE)"

elif distro os-release && which apk 2>/dev/null >/dev/null ; then
	. $ROOTDIR/etc/os-release
	DISTRIB_ID="$ID"
	DISTRIB_RELEASE="$VERSION_ID"

elif distro os-release && which tce-ab 2>/dev/null >/dev/null ; then
	. $ROOTDIR/etc/os-release
	DISTRIB_ID="TinyCoreLinux"
	DISTRIB_RELEASE="$VERSION_ID"

elif distro arch-release ; then
	DISTRIB_ID="ArchLinux"
	DISTRIB_RELEASE="2010"
	if grep 2011 -q $ROOTDIR/etc/pacman.d/mirrorlist ; then
		DISTRIB_RELEASE="2011"
	fi

elif distro mcst_version ; then
	DISTRIB_ID="MCST"
	DISTRIB_RELEASE=$(cat "$DISTROFILE" | grep "release" | sed -e "s|.*release \([0-9]*\).*|\1|g")

elif distro astra_version ; then
	#DISTRIB_ID=`cat $DISTROFILE | get_var DISTRIB_ID`
	DISTRIB_ID="AstraLinux"
	#DISTRIB_RELEASE=$(cat "$DISTROFILE" | head -n1 | sed -e "s|.* \([a-z]*\).*|\1|g")
	DISTRIB_RELEASE=$DISTRIB_CODENAME

# for Ubuntu use standard LSB info
elif [ "$DISTRIB_ID" = "Ubuntu" ] && [ -n "$DISTRIB_RELEASE" ]; then
	# use LSB version
	true

# Debian based
elif distro debian_version ; then
	DISTRIB_ID="Debian"
	DISTRIB_RELEASE=$(cat $DISTROFILE | sed -e "s/\..*//g")


# Mandriva based
elif distro pclinuxos-release ; then
	DISTRIB_ID="PCLinux"
	if   has "2007" ; then DISTRIB_RELEASE="2007"
	elif has "2008" ; then DISTRIB_RELEASE="2008"
	elif has "2010" ; then DISTRIB_RELEASE="2010"
	fi

elif distro mandriva-release || distro mandrake-release ; then
	DISTRIB_ID="Mandriva"
	if   has 2005 ; then DISTRIB_RELEASE="2005"
	elif has 2006 ; then DISTRIB_RELEASE="2006"
	elif has 2007 ; then DISTRIB_RELEASE="2007"
	elif has 2008 ; then DISTRIB_RELEASE="2008"
	elif has 2009.0 ; then DISTRIB_RELEASE="2009.0"
	elif has 2009.1 ; then DISTRIB_RELEASE="2009.1"
	else
		# use /etc/lsb-release info by default
		if has ROSA ; then
			DISTRIB_ID="ROSA"
		fi
	fi

# Fedora based
elif distro linux-xp-release || distro lxp-release; then
	DISTRIB_ID="LinuxXP"
	if has "Attack of the Clones" ; then DISTRIB_RELEASE="2006"
	elif has "2007" ; then DISTRIB_RELEASE="2007"
	elif has "2008" ; then DISTRIB_RELEASE="2008"
	elif has "2009" ; then DISTRIB_RELEASE="2009"
	fi

elif distro asplinux-release ; then
	DISTRIB_ID="ASPLinux"
	if   has Karelia ; then DISTRIB_RELEASE="10"
	elif has Seliger ; then DISTRIB_RELEASE="11"
	elif has "11.1" ; then DISTRIB_RELEASE="11.1"
	elif has Ladoga ; then DISTRIB_RELEASE="11.2"
	elif has "11.2" ; then DISTRIB_RELEASE="11.2"
	elif has "12" ; then DISTRIB_RELEASE="12"
	elif has "13" ; then DISTRIB_RELEASE="13"
	elif has "14" ; then DISTRIB_RELEASE="14"
	elif has "15" ; then DISTRIB_RELEASE="15"
	fi

elif distro MCBC-release ; then
	DISTRIB_ID="MCBC"
	if   has 3.0 ; then DISTRIB_RELEASE="3.0"
	elif has 3.1 ; then DISTRIB_RELEASE="3.1"
	fi

elif distro fedora-release ; then
	DISTRIB_ID="Fedora"
	DISTRIB_RELEASE=$(cat "$DISTROFILE" | grep "release" | sed -e "s|.*release \([0-9]*\).*|\1|g")

elif distro redhat-release ; then
	# FIXME if need
	# actually in the original RHEL: Red Hat Enterprise Linux .. release N
	DISTRIB_ID="RHEL"
	if has CentOS ; then
		DISTRIB_ID="CentOS"
	elif has Scientific ; then
		DISTRIB_ID="Scientific"
	fi
	if has Beryllium ; then
		DISTRIB_ID="Scientific"
		DISTRIB_RELEASE="4.1"
	elif has Shrike ; then
		DISTRIB_ID="RedHat"
		DISTRIB_RELEASE="9"
	elif has Taroon ; then 	DISTRIB_RELEASE="3"
	elif has "release 4" ; then DISTRIB_RELEASE="4"
	elif has "release 5" ; then DISTRIB_RELEASE="5"
	elif has "release 6" ; then DISTRIB_RELEASE="6"
	elif has "release 7" ; then DISTRIB_RELEASE="7"
	fi

# SUSE based
elif distro SuSe-release || distro SuSE-release ; then
	DISTRIB_ID="SUSE"
	DISTRIB_RELEASE=$(cat "$DISTROFILE" | grep "VERSION" | sed -e "s|^VERSION = ||g")
	if   has "SUSE Linux Enterprise Desktop" ; then
		DISTRIB_ID="SLED"
	elif has "SUSE Linux Enterprise Server" ; then
		DISTRIB_ID="SLES"
	fi

# fixme: can we detect by some file?
elif [ `uname` = "FreeBSD" ] ; then
	DISTRIB_ID="FreeBSD"
	UNAME=$(uname -r)
	DISTRIB_RELEASE=$(echo "$UNAME" | grep RELEASE | sed -e "s|\([0-9]\.[0-9]\)-RELEASE|\1|g")

# fixme: can we detect by some file?
elif [ `uname` = "SunOS" ] ; then
	DISTRIB_ID="SunOS"
	DISTRIB_RELEASE=$(uname -r)

# fixme: can we detect by some file?
elif [ `uname` = "Darwin" ] ; then
	DISTRIB_ID="MacOS"
	DISTRIB_RELEASE=$(uname -r)

# fixme: move to up
elif [ `uname` = "Linux" ] && which guix 2>/dev/null >/dev/null ; then
	DISTRIB_ID="GNU/Linux/Guix"
	DISTRIB_RELEASE=$(uname -r)

# fixme: move to up
elif [ `uname` = "Linux" ] && [ -x $ROOTDIR/system/bin/getprop ] ; then
	DISTRIB_ID="Android"
	DISTRIB_RELEASE=$(getprop | awk -F": " '/build.version.release/ { print $2 }' | tr -d '[]')

# try use standart LSB info by default
elif distro lsb-release && [ -n "$DISTRIB_RELEASE" ]; then
	# use LSB
	true
fi

case $1 in
	-p)
		# override DISTRIB_ID
		test -n "$2" && DISTRIB_ID="$2"
		pkgtype
		exit 0
		;;
	-h)
		echo "distr_vendor - system name and version detection"
		echo "Usage: distr_vendor [options] [args]"
		echo "-p [SystemName] - print type of packaging system"
		echo "-d - print distro name"
		echo "-v - print version of distro"
		echo "-e - print full name of distro with version (by default)"
		echo "-s [SystemName] - print name of distro for build system (like in the package release name)"
		echo "-n [SystemName] - print vendor name (as _vendor macros in rpm)"
		echo "-V - print the version of $0"
		echo "-h - this help"
		exit 0
		;;
	-d)
		echo $DISTRIB_ID
		;;
	-v)
		echo $DISTRIB_RELEASE
		;;
	-s)
		# override DISTRIB_ID
		test -n "$2" && DISTRIB_ID="$2"
		pkgvendor
		exit 0
		;;
	-n)
		# override DISTRIB_ID
		test -n "$2" && DISTRIB_ID="$2"
		rpmvendor
		exit 0
		;;
	-V)
		echo "20120519"
		exit 0
		;;
	*)
		# if run without args, just printout Name/Version of the current system
		[ -n "$DISTRIB_RELEASE" ] && echo $DISTRIB_ID/$DISTRIB_RELEASE || echo $DISTRIB_ID
		;;
esac