#!/bin/sh
# Copyright (c) 2013 - OpenSLX GmbH
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your feedback to feedback@openslx.org
#
# General information about OpenSLX can be found under http://openslx.org
#
# Initialize swap for OpenSLX linux stateless clients, first for swap as
# compressed RAM (zram) and then on local disk partitions, if detected by
# disk-analyse.sh script

#############################################################################

# Depends on analyse-disk.sh and on availability of the appropriate kernel
# module/functionality

# try to enable compressed RAM SWAP / ZRAM
if modprobe -q zram 2>/dev/null ; then
  # assign a quarter of total mem to zram
  echo $(( $(free -k | awk '/^Mem:/ { print $2 }') * 256 )) > /sys/block/zram0/disksize
  mkswap /dev/zram0 2>/dev/null
  swapon /dev/zram0 1>/dev/null 2>/dev/null
fi

# add on-disk swap if available
for hdpartnr in $(cat /etc/fstab | sed -n -e "/swap.*swap/p"| \
    sed -e "s/[[:space:]].*//") ; do
  mkswap ${hdpartnr} 2>/dev/null
  swapon ${hdpartnr} 1>/dev/null 2>/dev/null
done