XFree Local Multi-User HOWTO
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# C.5. For installing Nvidia drivers for parallel use with DRI

    #!/bin/bash
    ########################################################
    ### /usr/sbin/ruby_NVinstaller                       ###
    ### for usage call it with -h or --help parameter    ###
    ########################################################

    if [[ -z $1 ]] || [ "$1" == "-h" ] || [ "$1" == "--help" ] ;then
    echo
    echo "Usage :"
    echo "$0 full path to Nvidia installer"
    echo "eg. $0 /root/NVIDIA-Linux-x86-1.0-4349.run"
    exit 1
    fi

    if [[ -z $OPENWINHOME ]];then
    echo
    echo "OPENWINHOME not defined!!!"
    echo "Please set the environment variable OPENWINHOME"
    echo "pointing to your XFree prefix eg. /usr/X11R6"
    echo "for bash shell :"
    echo "export OPENWINHOME=/usr/X11R6"
    exit 1
    fi

    cd $OPENWINHOME
    echo
    echo "backup file for XFree's GL libraries "
    echo "is $OPENWINHOME/libGL-backup.tar"
    if [ -x libGL-backup.tar ]; then
    	echo "old backup exist, deleting" && rm libGL-backup.tar
    fi
    echo
    find lib -name "libGL.*" -o -name "libGLcore*" \
    	-o -name "libglx.*" | xargs tar  rpf   libGL-backup.tar \
    	&& echo "backup finished"
    echo
    echo "now running Nvidia installer"
    echo "`which $1` --no-opengl-headers --xfree86-prefix=/usr/X11R6NV --opengl-prefix=/usr/X11R6NV"
    echo
    `which $1` --no-opengl-headers --xfree86-prefix=/usr/X11R6NV --opengl-prefix=/usr/X11R6NV
    RETVAL=$?
    if [ $RETVAL -eq 0 ]; then

    echo
    echo "Nvidia installer finished,"
    echo "now coping files to /usr/X11R6/libNV/"
    echo
    cd /usr/X11R6NV/lib &&  tar c * | tar xvC /usr/X11R6/libNV/
    echo
    echo "restoring backuped GL libraries"
    echo
    cd $OPENWINHOME
    tar xvfp libGL-backup.tar && ldconfig && echo "GL libraries restored" && rm libGL-backup.tar
    fi

    if [ $RETVAL -ne 0 ]; then
    	echo
    	echo "installer aborted, not restoring backup"
    	echo "deleting backup files" &&  rm libGL-backup.tar
    fi

    echo
    echo "script finished"

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