#!/bin/sh

# Copyright 2012-2015 Edward W. Koenig, Vancouver, WA, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# nvidia-switch utility 2.5
#
# A tool to install and cleanly remove the nvidia driver without stomping on the xorg files.
# Note: this tool "should" allow switching on the fly, but why? Pick a driver! You will still
# need to edit a bunch of other config files.

# TO-DO: needs cleanup; too brittle.

set -e

ROOT="${ROOT:-/}"
CWD=$(pwd)
LIBSUFFIX="LIBDIRSUFFIX" # This will be replaced in the build script
COMPAT32="LIB32FLAG" # This will be replaced in the build script (yes | no)
INC="${ROOT}usr/include/GL"
LIB="${ROOT}usr/lib${LIBSUFFIX}"
LIB32="${ROOT}usr/lib"
XMOD="${LIB}/xorg/modules"
XLIB="$XMOD/extensions"
NV_VERSION='PKGVERSION' # This will be replaced in the build script
GL_VERSION="1.2.0"
NV_CONF="/usr/share/X11/xorg.conf.d/10-nvidia.conf"

save_GL(){
  cd $2
  if [ "$1" = "nvidia" ]; then
    if [ -e libGL.so.$GL_VERSION ]; then
       mv libGL.so.$GL_VERSION libGL.so.$GL_VERSION-xorg
       mv libGL.la libGL.la-xorg 
    fi
    mv libGL.la-nvidia libGL.la
    ln -sf libGL.so.$NV_VERSION libGL.so.1
    ln -sf libGL.so.$NV_VERSION libGL.so
    if [ -e libEGL.so.1.0.0 ]; then
       mv libEGL.so.1.0.0 libEGL.so.1.0.0-xorg
    fi
    mv libEGL.so.1-nvidia libEGL.so.$NV_VERSION
    ln -sf libEGL.so.$NV_VERSION libEGL.so.1
    ln -sf libEGL.so.1 libEGL.so
    if [ -e libGLESv1_CM.so.1.1.0 ]; then
       mv libGLESv1_CM.so.1.1.0 libGLESv1_CM.so.1.1.0-xorg
    fi
    mv libGLESv1_CM.so.1-nvidia libGLESv1_CM.so.$NV_VERSION
    ln -sf libGLESv1_CM.so.$NV_VERSION libGLESv1_CM.so.1
    ln -sf libGLESv1_CM.so.1 libGLESv1_CM.so
    if [ -e libGLESv2.so.2.0.0 ]; then
       mv libGLESv2.so.2.0.0 libGLESv2.so.2.0.0-xorg
    fi
    mv libGLESv2.so.2-nvidia libGLESv2.so.$NV_VERSION
    ln -sf libGLESv2.so.$NV_VERSION libGLESv2.so.2
    ln -sf libGLESv2.so.2 libGLESv2.so
  fi

  if [ "$1" = "xorg" ]; then
     mv libGL.la libGL.la-nvidia
     if [ -e libGL.so.$GL_VERSION-xorg ]; then
        mv libGL.so.$GL_VERSION-xorg libGL.so.$GL_VERSION
        ln -sf libGL.so.$GL_VERSION libGL.so.1
        ln -sf libGL.so.$GL_VERSION libGL.so
        mv libGL.la-xorg libGL.la
     fi
     mv libEGL.so.$NV_VERSION libEGL.so.1-nvidia
     if [ -e libEGL.so.1.0.0-xorg ]; then
         mv libEGL.so.1.0.0-xorg libEGL.so.1.0.0
         ln -sf libEGL.so.1.0.0 libEGL.so.1
         ln -sf libEGL.so.1.0.0 libEGL.so
     fi
     mv libGLESv2.so.$NV_VERSION libGLESv2.so.2-nvidia
     if [ -e libGLESv2.so.2.0.0-xorg ]; then
       mv libGLESv2.so.2.0.0-xorg libGLESv2.so.2.0.0
       ln -sf libGLESv2.so.2.0.0 libGLESv2.so.2
       ln -sf libGLESv2.so.2.0.0 libGLESv2.so
     fi
     mv libGLESv1_CM.so.$NV_VERSION libGLESv1_CM.so.1-nvidia
     if [ -e libGLESv1_CM.so.1.1.0-xorg ]; then
        mv libGLESv1_CM.so.1.1.0-xorg libGLESv1_CM.so.1.1.0
        ln -sf libGLESv1_CM.so.1.1.0 libGLESv1_CM.so.1
        ln -sf libGLESv1_CM.so.1.1.0 libGLESv1_CM.so
     fi 
  fi
  cd "$CWD"
}

save_glx(){
  cd "$XLIB"
  if [ "$1" = "nvidia" ]; then
	if [ ! -e libglx.so-xorg ]; then
	    mv libglx.la libglx.la-xorg
	    mv libglx.so libglx.so-xorg
	fi
	ln -sf libglx.so.$NV_VERSION-nvidia libglx.so.$NV_VERSION
	ln -sf libglx.so.$NV_VERSION libglx.so
  elif [ "$1" = "xorg" ]; then
	rm -f libglx.so.$NV_VERSION
	rm -f libglx.so
	mv libglx.so-xorg libglx.so
	mv libglx.la-xorg libglx.la
  fi
cd "$CWD"
}

nvidia_ldconfig(){
   /sbin/ldconfig
   #Generate correct symink for that lib
   /sbin/ldconfig -l $1
}

nvidia_install(){
  echo $'Installing to nvidia-driver files!\n'
  echo "Make sure the nvidia driver is ENABLED in /etc/X11/xorg.conf"
  echo "and in /etc/X11/xorg.conf.d."
  echo "Otherwise, this may lead to improperly working drivers."

  save_GL "nvidia" $LIB
  save_glx "nvidia"
# Check for multilib configuration
  if [ "$COMPAT32" = "yes" ]; then
    save_GL "nvidia" $LIB32
  fi
}

nvidia_remove(){
  echo $'Returning to stock xorg files!\n'
  echo "Make sure the nvidia driver is DISABLED in /etc/X11/xorg.conf"
  echo "and in /etc/X11/xorg.conf.d."
  echo "Otherwise, this may lead to improperly working drivers."

  save_GL "xorg" $LIB
  save_glx "xorg"
  
  # Kill dangling symlinks; check next mesa version for libGLES presence.
  rm -f $LIB/libnvidia*.so.1
  rm -f $LIB/libvdpau_nvidia.so.1
  rm -f $LIB/libcuda.so.1
  
# Check for multilib configuration
  if [ "$COMPAT32" = "yes" ]; then
    save_GL "xorg" $LIB32
#   remove dangling symlinks
    rm -f $LIB32/libnvidia*.so.1
    rm -f $LIB32/libvdpau_nvidia.so.1
    rm -f $LIB32/libcuda.so.1
  fi

  if [ -e $NV_CONF ]; then
	rm -f $NV_CONF
  fi
}

usage(){
  echo "Usage:"
  echo " --install		Set up nvidia driver files (only during pkg install)"
  echo " --remove		Return to stock xorg files and remove all symlinks"
  echo " --help			Show this help message"
}

if [ "$1" = '--install' ]; then
  nvidia_install
elif [ "$1" = '--remove' ]; then
  nvidia_remove
elif [ "$1" = '--help' ]; then
  usage
else
  usage
fi