source: MondoRescue/branches/stable/tools/distro-env@ 1014

#!/bin/bash
#
# Create env depending on the distro on which we are
#
# $Id$
#
# Input parameters : $ddir (distro name) and $dver (distro version)
# If they do not exist then deduce from current distro
# Exports : $dfam (distro family) $suf (pkg suffix) $dtype (distro type) TOPBUILDDIR (dir to build packages) 

#
# Guess ddir and dver from the underlying distro
#
if [ _"$ddir" = _"" ]; then
    if [ -e /etc/mandriva-release ]; then
        export ddir="mandriva"
        export dver=`awk '{print $4}' /etc/mandriva-release`
    elif [ -e /etc/mandrake-release ]; then
        export ddir="mandrake"
        export dver=`awk '{print $3}' /etc/mandrake-release`
    elif [ -e /etc/redhat-release ]; then
        grep -q Enterprise /etc/redhat-release
        if [ $? -eq 0 ]; then
            export ddir="rhel"
            export dver=`awk '{print $7}' /etc/redhat-release`
        elif grep -q Fedora /etc/redhat-release ; then
            export ddir="fedora"
            export dver=`awk '{print $4}' /etc/redhat-release`
        elif grep -q CentOS /etc/redhat-release ; then
            export ddir="centos"
            export dver=`awk '{print $3}' /etc/redhat-release`
        else
            export ddir="redhat"
            export dver=`awk '{print $5}' /etc/redhat-release`
        fi
    elif [ -e /etc/SuSE-release ]; then
        grep -q Enterprise /etc/SuSE-release
        if [ $? -eq 0 ]; then
            export ddir="sles"
            export dver=`head -1 /etc/SuSE-release | awk '{print $5}'`
        elif grep -q openSUSE /etc/SuSE-release ; then
            export ddir="suse"
            export dver=`head -1 /etc/SuSE-release | awk '{print $2}'`
        else
            export ddir="suse"
            export dver=`head -1 /etc/SuSE-release | awk '{print $3}'`
        fi
    elif [ -e /etc/gentoo-release ]; then
        export ddir="gentoo"
        export dver=`awk '{print $5}' /etc/gentoo-release | cut -d. -f1-2`
    elif [ -e /etc/debian_version ]; then
        export ddir="debian"
        export dver=`cat /etc/debian_version`
        # Debian assigns release names only once a release actually happens.
        # Debian does not distinguish between testing and unstable because
        # unstable today is what testing will be in about ten days time. So,
        # in case we encounter "tesing/unstable", we assume unstable, i.e. sid.
        # Note that for released versions, the numeric version will be contained
        # in debian_version, e.g. on a sarge system, the value will be '3.1'.
        if [ $dver = "testing/unstable" ]; then
            export dver = "sid"
        fi
    else
        export ddir="unknown"
        export dver=""
    fi
fi

#
# Generate all other parameters
#
if [ $ddir = "debian" ]; then
    dfam="debian"
    dtype="deb"
    suf=".${dfam}${dver}"
elif [ $ddir = "gentoo" ]; then
    dfam="gentoo"
    dtype="ebuild"
    dver1=`echo ${dver} | sed "s/\.//"`
    suf=".${ddir}${dver1}"
elif [ $ddir = "slackware" ]; then
    dfam="slack"
    dtype="tgz"
    suf=".${dfam}${dver}"
elif [ $ddir = "sles" -o $ddir = "suse" ]; then
    dfam="suse"
    dtype="rpm"
    suf=".${ddir}${dver}"
elif [ $ddir = "fedora" -o $ddir = "redhat" -o $ddir = "rhel" -o $ddir = "centos" ]; then
    dfam="redhat"
    dtype="rpm"
    dver1=`echo ${dver} | sed "s/\.//"`
    if [ $ddir = "fedora" ]; then
        suf=".fc${dver1}"
    elif [ $ddir = "centos" ]; then
        dver1=`echo ${dver} | sed "s/\.[0-9]//"`
        suf=".centos${dver1}"
    elif [ $ddir = "redhat" ]; then
        suf=".rh${dver1}"
    else
        suf=".rhel${dver1}"
    fi
elif [ $ddir = "mandrake" ]; then
    dfam="mandriva"
    dtype="rpm"
    suf=".`echo $dver | sed 's/\.//'`mdk"
elif [ $ddir = "mandriva" ]; then
    dfam="mandriva"
    dtype="rpm"
    suf=".`echo $dver | sed 's/\.//'`mdv"
else
    dfam="unknown"
    dtype="unknown"
    suf="unknown"
fi

export dfam
export dtype
export suf

#
# Additional exports and preparation for some distros
#

# Default
export TOPBUILDDIR=${TOPDIR}/../build

if [ _"$dtype" = _"rpm" ]; then
    export TOPBUILDDIR=`rpmquery --eval '%{_topdir}' 2> /dev/null`
    export ARCH=`rpm --showrc | egrep "^build arch" | awk '{print $4}'`
    mkdir -p ${TOPBUILDDIR}/{RPMS,SRPMS,SPECS,SOURCES,BUILD}
    if [ $? -ne 0 ]; then
        echo "Please ensure that you can write into ${TOPBUILDDIR}"
        echo "Solution: setup _topdir in your ~/.rpmmacros or"
        echo "chown the ${TOPBUILDDIR} to your uid"
        exit -1
    fi
elif [ _"$dtype" = _"deb" ]; then
    mkdir -p ${TOPBUILDDIR}
elif [ _"$dtype" = _"ebuild" ]; then
    mkdir -p ${TOPBUILDDIR}/portage
fi