config() {
  NEW="$1"
  OLD="$(dirname $NEW)/$(basename $NEW .new)"
  # If there's no config file by that name, mv it over:
  if [ ! -r $OLD ]; then
    mv $NEW $OLD
  elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then
    # toss the redundant copy
    rm $NEW
  fi
  # Otherwise, we leave the .new copy for the admin to consider...
}

preserve_perms() {
  NEW="$1"
  OLD="$(dirname $NEW)/$(basename $NEW .new)"
  if [ -e $OLD ]; then
    cp -a $OLD ${NEW}.incoming
    cat $NEW > ${NEW}.incoming
    mv ${NEW}.incoming $NEW
  fi
  config $NEW
}

# Prepare the new configuration files:
config etc/vbox/vbox.cfg.new
config etc/profile.d/vbox.csh.new
config etc/profile.d/vbox.sh.new
preserve_perms etc/rc.d/rc.vboxdrv.new
preserve_perms etc/rc.d/rc.vboxnet.new
preserve_perms etc/rc.d/rc.vboxbridge.new

# Update the desktop database:
if [ -x /usr/bin/update-desktop-database ]; then
  /usr/bin/update-desktop-database usr/share/applications >/dev/null 2>&1
fi

# If rc.vboxdrv is executable, run it on startup:
run=`grep "sh /etc/rc.d/rc.vboxdrv" etc/rc.d/rc.local`
if [[ "${run}" == "" ]]; then
cat << EOF >> etc/rc.d/rc.local

# VirtualBox driver
# To disable VirtualBox driver, chmod rc.vboxdrv to 644
if [ -x /etc/rc.d/rc.vboxdrv ]; then
  sh /etc/rc.d/rc.vboxdrv start
fi
EOF
fi

# If rc.vboxnet is executable, run it on startup:
run=`grep "sh /etc/rc.d/rc.vboxnet" etc/rc.d/rc.local`
if [[ "${run}" == "" ]]; then
cat << EOF >> etc/rc.d/rc.local

# VirtualBox network
# To disable VirtualBox network, chmod rc.vboxnet to 644
if [ -x /etc/rc.d/rc.vboxnet ]; then
  sh /etc/rc.d/rc.vboxnet start
fi
EOF
fi

# If rc.vboxbridge is executable, run it on startup:
run=`grep "sh /etc/rc.d/rc.vboxbridge" etc/rc.d/rc.local`
if [[ "${run}" == "" ]]; then
cat << EOF >> etc/rc.d/rc.local

# VirtualBox bridge
# To enable VirtualBox bridged networking, chmod rc.vboxbridge to 755
if [ -x /etc/rc.d/rc.vboxbridge ]; then
  sh /etc/rc.d/rc.vboxbridge start 1 user
fi
EOF
fi

# Chroot to insert the group in the possible --root target:
chroot . << EOR 2>/dev/null
/usr/sbin/groupadd -g215 vboxusers 2> /dev/null
EOR

# Show important notes:
echo
echo "********************************************************************************"
echo "*                               IMPORTANT NOTES                                *"
echo "*                                                                              *"
echo "* -Remember to run '/etc/rc.d/rc.vboxdrv setup' after install and everytime    *"
echo "* your kernel changes.                                                         *"
echo "*                                                                              *"
echo "* -To enable bridged networking change the execution permissions of            *"
echo "* /etc/rc.d/rc.vboxbridge and modify rc.local line to match your number of     *"
echo "* machines and the user running virtualbox:                                    *"
echo "*     rc.vboxbridge {start [number of virtual interfaces] [user] | stop}       *"
echo "********************************************************************************"
echo