#!/bin/sh

# ***************************************************************************
# *   Copyright (C) 2007-2008 by Heinz Wiesinger                            *
# *   pprkut@liwjatan.at                                                    *
# *   http://www.liwjatan.at                                                *
# *                                                                         *
# *   This program is free software; you can redistribute it and/or modify  *
# *   it under the terms of the GNU General Public License as published by  *
# *   the Free Software Foundation; either version 3 of the License, or     *
# *   (at your option) any later version.                                   *
# *                                                                         *
# *   This program is distributed in the hope that it will be useful,       *
# *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
# *   GNU General Public License for more details.                          *
# *                                                                         *
# *   You should have received a copy of the GNU General Public License     *
# *   along with this program; if not, write to the                         *
# *   Free Software Foundation, Inc.,                                       *
# *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
# ***************************************************************************/
# nvidia-switch utility 0.7.0
#
# A tool to switch between nvidia-binary-driver and stock xorg-driver
# if both are installed in parallel.

set -e

ROOT="/"
CWD=$(pwd)
INC="${ROOT}usr/include/GL"
LIB="${ROOT}usr/lib"
XMOD="${ROOT}usr/lib/xorg/modules"
XLIB="$XMOD/extensions"
NV_VERSION='PKGVERSION' # This will be replaced in the build script
GL_VERSION="1.2"

remove_link(){
if [ -L "$1" ]; then
  rm -f "$1"
fi
}

remove_existing(){
if [ -e "$1" ]; then
  rm -f $1
fi
}

move_existing(){
if [ -e "$1" ]; then
  mv $1 $2
fi
}

setup_link(){
  if [ "$1" = "mv" ]; then
    mv "$2" "$3"
  else
    rm -f $2
  fi
  ln -s "$3" "$2"
}

# Move and rename files in /usr/include
# $1 = from
# $2 = to
incs(){
cd "$INC"

if [ "$2" = "cleanup" ]; then
  CMD="mv"
  THREE="$1"
else
  CMD="ln -s"
  THREE="$2"
fi

for i in glxext.h glext.h glx.h gl.h; do
  if [ -L "$i" ]; then
    rm -f "$i"
    $CMD "$i-$THREE" "$i"
  elif [ -e "$i" ]; then
    if [ "$2" = "cleanup" ]; then
      rm -f "$i-$1"
    else
      mv "$i" "$i-$1"
      ln -s "$i-$THREE" "$i"
    fi
  else
    $CMD "$i-$THREE" "$i"
  fi
done

cd "$CWD"
}

libs(){
for i in libGLcore.so libGLcore.la libglx.la; do
  if [ "$1" = "nvidia" ]; then
    #If this library exists, move it to *-xorg
    move_existing "$XLIB/$i" "$XLIB/$i-xorg"
  else
    #If .so does not exist, and *-xorg does, then remove the -xorg
    if [ -e "$XLIB/$i" ]; then
      remove_existing "$XLIB/$i-xorg"
    else
      move_existing "$XLIB/$i-xorg" "$XLIB/$i"
    fi
  fi
done
}

libs_basic(){
for i in libGL.so libGLcore.so; do
  #if this link exists, remove it, if it's a file, move it to *.nvidia
  if [ -L "$LIB/$i.$NV_VERSION" ]; then
    rm -f "$LIB/$i.$NV_VERSION"
  elif [ -e "$LIB/$i.$NV_VERSION" ]; then
    mv "$LIB/$i.$NV_VERSION" "$LIB/$i.$NV_VERSION-nvidia"
  fi
  remove_link "$LIB/$i.1"
done
}

libgl_nvidia(){
#if libGL.so.$GL_VERSION does exist, move it to libGL.so.$GL_VERSION-xorg, as it conflicts if nvidia's libGL.so
# then remove the libGL.so.1 symlink and create a new one pointing to nvidia's libGL.so
if [ -e "$LIB/libGL.so.$GL_VERSION" ]; then
  cd "$LIB"
  mv libGL.so.$GL_VERSION libGL.so.$GL_VERSION-xorg
  setup_link "" "libGL.so.1" "libGL.so.$NV_VERSION"
  cd "$CWD"
fi
}

libgl_xorg(){
#if libGL.so.$GL_VERSION does not exist and libGL.so.$GL_VERSION-xorg does, move it to libGL.so.$GL_VERSION
# then remove the libGL.so.1 symlink and create a new one pointing to nvidia's libGL.so
if [ -e "$LIB/libGL.so.$GL_VERSION" ]; then
  remove_existing "$LIB/libGL.so.$GL_VERSION-xorg"
else
  if [ -e "$LIB/libGL.so.$GL_VERSION-xorg" ]; then
    cd "$LIB"
    mv libGL.so.$GL_VERSION-xorg libGL.so.$GL_VERSION
    ln -s libGL.so.$GL_VERSION libGL.so.1
    cd "$CWD"
  fi
fi
}


libglcore_nvidia(){
#If libGLcore.so.$NV_VERSION-nvidia does exists, then remove the -nvidia and make it usable that way
if [ -e "$LIB/libGLcore.so.$NV_VERSION-nvidia" ]; then
  cd "$LIB"
  rm -f libGLcore.so.$NV_VERSION libGLcore.so.1
  ln -s libGLcore.so.$NV_VERSION-nvidia libGLcore.so.$NV_VERSION
  ln -s libGLcore.so.$NV_VERSION libGLcore.so.1
  cd "$CWD"
fi
}

lib_nvidia(){
for i in libGL.so libglx.so; do
  if [ "$i" = "libGL.so" ]; then
    cd "$LIB"
  elif [ "$i" = "libglx.so" ]; then
    cd "$XLIB"
  fi
  #If libGL.so.$NV_VERSION-nvidia does exists, then remove the -nvidia and make it usable that way
  if [ -e "$i.$NV_VERSION-nvidia" ]; then
    setup_link "" "$i.$NV_VERSION" "$i.$NV_VERSION-nvidia"
  fi
  cd "$CWD"
done
}

libglx_base(){
for i in $(ls libglx.so* | grep -v -); do
  if ! [ "$i" = "libglx.so.$NV_VERSION" ]; then
    rm -f $i
  fi
done
ln -s libglx.so.$NV_VERSION libglx.so
}

libglx_nvidia(){
# if libglx.so is not a link, back it up to *-xorg, and create a symlink to nvidia's one
# if it's a link, then remove it and create a new one.
if ! [ -L "$XLIB/libglx.so" ]; then
  cd $XLIB
  mv libglx.so libglx.so-xorg
  libglx_base
else
  cd $XLIB
  libglx_base
fi
cd $CWD
}

libglx_xorg(){
if [ "$1" = "xorg" ]; then
  CMD="ln -s"
else
  CMD="mv"
fi

#if this library exists, move it to *-nvidia
if [ -L "$XLIB/libglx.so.$NV_VERSION" ]; then
  rm $XLIB/libglx.so.$NV_VERSION
elif [ -e "$XLIB/libglx.so.$NV_VERSION" ]; then
  mv $XLIB/libglx.so.$NV_VERSION $XLIB/libglx.so.$NV_VERSION-nvidia
fi

# if libglx.so exists and is a link, remove it and create a new one
# If it does exists and is not a link, remove the old one, and create the new one.
# if it does not exist, create a symlink
if [ -L "$XLIB/libglx.so" ]; then
  cd $XLIB
  rm libglx.so
  $CMD libglx.so-xorg libglx.so
elif [ -e "$XLIB/libglx.so" ]; then
  if [ "$1" = "xorg" ]; then
    cd $XLIB
    setup_link "mv" "libglx.so" "libglx.so-xorg"
  else
    remove_existing "$XLIB/libglx.so-xorg"
  fi
else
  cd $XLIB
  $CMD libglx.so-xorg libglx.so
fi
cd $CWD
}

libwfb_nvidia(){
#Recreate the link removed by --xorg
if ! [ -e "$XMOD/libwfb.so" ]; then
  cd $XMOD
  ln -s libnvidia-wfb.so.1 libwfb.so
  cd $CWD
fi
}

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

if [ "$2" = "xorg" ]; then
  #Remove so-link, recreated by ldconfig
  cd $LIB
  remove_link "libGLcore.so.1"
  cd $CWD
fi
}

nvidia(){
  echo $'Switching to nvidia-driver files!\n'
  echo "You have to ENABLE the nvidia driver in /etc/X11/xorg.conf."
  echo "Otherwise, this may lead to improperly working drivers."

  incs "xorg" "nvidia"
  lib_nvidia
  libgl_nvidia
  libglcore_nvidia
  libs "nvidia"
  libglx_nvidia
  libwfb_nvidia

  LD_NVIDIA="/usr/lib/libGL.so.$NV_VERSION-nvidia"
  nvidia_ldconfig $LD_NVIDIA
}

xorg(){
  echo $'Switching to stock xorg files.\n'
  if [ "$1" = "cleanup" ]; then
    echo $'Cleaning up symlinks.\n'
  fi
  echo "You have to DISABLE the nvidia driver in /etc/X11/xorg.conf."
  echo "Otherwise, this may lead to improperly working drivers."

  if [ "$1" = "cleanup" ]; then
    incs "xorg" "cleanup"
  else
    incs "xorg" "xorg"
  fi

   libs_basic
   libgl_xorg
   libs ""
   if [ "$1" = "cleanup" ]; then
     libglx_xorg ""
   else
     libglx_xorg "xorg"
   fi
   remove_link "$XMOD/libwfb.so"

   LD_NVIDIA="/usr/lib/libGL.so.1.2"
   nvidia_ldconfig $LD_NVIDIA "xorg"
}

usage(){
  echo "Usage:"
  echo " --nvidia	Switch to nvidia driver files"
  echo " --xorg		Switch to stock xorg files"
  echo " --cleanup	Switch to stock xorg files and remove all created symlinks"
  echo " --install	Switch to nvidia driver files"
  echo "		  This is used on installation to handle installroot correctly"
  echo "		  Please use --nvidia for after-install switches instead"
  echo " --help		Show this help message"
}

if [ "$1" = '--nvidia' ]; then
  nvidia
elif [ "$1" = '--install' ]; then
  ROOT=""
  CWD=$(pwd)
  INC="${ROOT}usr/include/GL"
  LIB="${ROOT}usr/lib"
  XMOD="${ROOT}usr/lib/xorg/modules"
  XLIB="$XMOD/extensions"
  nvidia
elif [ "$1" = '--xorg' ]; then
  xorg ""
elif [ "$1" = '--cleanup' ]; then
  xorg "cleanup"
elif [ "$1" = '--help' ]; then
  usage
else
  usage
fi