#!/bin/sh

# Copyright 2012-2019 Edward W. Koenig, Vancouver, WA, USA
# Updates copyright 2020 Lenard Spencer, Orlando, FL, 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 4.7.1
#
# A tool to install and cleanly remove the nvidia driver without stomping
# on the mesa files.  Note: this tool "should" allow switching on the fly,
# but why? Pick a driver! You will stilll need to edit a bunch of other
# config files.

# When ROOT=<PATH> is specified when using {install,upgrade,remove}pkg,
# PATH is usually specified without a trailing "/", so we need to add it
if [ "$ROOT" = "" ]; then
  ROOT="${ROOT:-"/"}"
else
  ROOT="${ROOT}/"
fi
CWD=$(pwd)
COMPAT32="LIB32FLAG" # This will be replaced in the build script (yes | no)
LIBSUFFIX="LIBDIRSUFFIX" # This will be replaced in the build script
INC="${ROOT}usr/include/GL"
LIB="${ROOT}usr/lib${LIBSUFFIX}"
LIB32="${ROOT}usr/lib"

save_GL(){
# backup original mesa and xorg conflicts
  cd $2
  case "$1" in
    "nvidia")
      if [ ! -e libGL.la-xorg ]; then
        mv libGL.la libGL.la-xorg
      fi
      cp -a libGL.la-nvidia libGL.la
      /sbin/ldconfig
    ;;

    "xorg")
      if [ -e libGL.la-xorg ]; then
       cp -a libGL.la-xorg libGL.la
      fi
       /sbin/ldconfig
  ;;

  *)
        echo "nothing to do for save_gl?"
        exit 1
  ;;
  esac
  cd "$CWD"
}

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

  save_GL "nvidia" $LIB

# 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 /usr/share/X11/xorg.conf.d and /etc/X11/xorg.conf.d."
  echo "(Removing nvidia-kernelis recommended to accomplish this.)"
  echo "Otherwise, this may lead to improperly working drivers."
  echo -e "\nPlease run /sbin/ldconfing after removing nvidia-driver."

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

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

case "$1" in
  "--install")
    nvidia_install
    ;;
  "--remove")
    nvidia_remove
    ;;
  "--help")
    usage
    ;;
  *)
    usage
    ;;
esac