#!/usr/bin/env bash 

# This script that will run its argument with vglrun is allowed and possible.
# vglrun allows some graphical applications to run faster when on remote desktops
# such as NoMachine. There are several conditions that must be met before
# vglrun will be used:
#   1. the environment variable FS_ALLOW_VGLRUN but be set to non-zero
#   2. vglrun must exist in the path or in /usr/pubsw/bin/vglrun
#   3. the shell should not be local (ie, must be a remote shell), 
#      thought it might not hurt to use vglrun if it is local
#
# Eg: fsvglrun freeview orig.mgz
#

if [ $# == 0 ]; then
  echo "USAGE: fsvglrun command args ..."
  exit 1
fi

if [ -z "$FS_ALLOW_VGLRUN" ]; then
  FS_ALLOW_VGLRUN=0
fi

which vglrun > /dev/null 2> /dev/null 
if [ $? -eq 0 ]; then
  #echo "Found vglrun"
  vglrun=`which vglrun`
elif [ -e /usr/pubsw/bin/vglrun ]; then
  vglrun=/usr/pubsw/bin/vglrun
  #echo "Found $vglrun"
else
  #echo "Could not find vglrun"
  FS_ALLOW_VGLRUN=0
fi
if [ ! -f /etc/opt/VirtualGL/vgl_xauth_key ] ; then
  # VGL is not installed
  FS_ALLOW_VGLRUN=0
fi

if [[ $DISPLAY = *:0 || $DISPLAY = *:0.0 ]]; then
  # definitely local
  #echo "local"
  FS_ALLOW_VGLRUN=0
fi

if [  $FS_ALLOW_VGLRUN -eq 0 ]; then
  exec "$@"
  exit $status
fi

echo "Using VGL"
#export VGL_DISPLAY=:0 # is this needed?
exec $vglrun "$@"
exit $status

#ps auxw | grep X | grep -v NX
#root      3177  0.2  0.3 1261528 501372 tty1   Ssl+ Jan10 147:24 /usr/bin/X :2 -background none -noreset -audit 4 -verbose -auth /run/gdm/auth-for-gdm-X9uybc/database -seat seat0 vt1