Update xulrunner for Ubuntu

update-xulrunner.sh

#!/bin/sh

if [ `id -u` -ne 0 ]; then
    echo This command should be run as root.
    exit 1
fi

XROOT=/opt/xulrunner
FFVER=$(perl -F/=/ -ane "print \$F[1] if \$F[0] eq 'Milestone'" /usr/lib/firefox/platform.ini)
ARCH=`uname -p`
XURL=https://ftp.mozilla.org/pub/mozilla.org/xulrunner/releases/$FFVER/runtimes/xulrunner-$FFVER.en-US.linux-$ARCH.tar.bz2

if [ -d $XROOT/$FFVER ]; then
    echo xulrunner-$FFVER is up to date.
    exit 0
fi

mkdir -p $XROOT/$FFVER
cd $XROOT/$FFVER
sh -c "wget -O- $XURL | tar -xj"
if [ $? -eq 0 ]; then
  ln -snf /opt/xulrunner/$FFVER/xulrunner/xulrunner /usr/bin/xulrunner
  ln -snf /opt/xulrunner/$FFVER/xulrunner/xpcshell /usr/bin/xpcshell
  echo Finished.
fi