util-linux-ng: add init script to enable swapfile if needed

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/sysutils/util-linux-ng/init.d/09_swapfile

@@ -0,0 +1,54 @@
+#!/bin/sh
+
+################################################################################
+#      Copyright (C) 2009-2010 OpenELEC.tv
+#      http://www.openelec.tv
+#
+#  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 2, 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 OpenELEC.tv; see the file COPYING.  If not, write to
+#  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+#  http://www.gnu.org/copyleft/gpl.html
+################################################################################
+
+#
+# create and enable swapfile
+#
+# runlevels: openelec, textmode
+
+. /etc/profile
+
+INSTALLED_MEMORY=`cat /proc/meminfo | grep 'MemTotal:' | awk '{print $2}'`
+
+if [ $INSTALLED_MEMORY -le 500000 -a -f $HOME/.config/swapon ]; then
+
+  if [ ! -f $HOME/.cache/swapfile ]; then
+    progress "creating swapfile"
+
+      mkdir -p $HOME/.cache
+      dd if=/dev/zero of=$HOME/.cache/swapfile bs=1024 count=524288
+      mkswap $HOME/.cache/swapfile
+  fi
+
+  progress "enable swapfile"
+    swapon -p 10000 $HOME/.cache/swapfile
+
+    [ $INSTALLED_MEMORY -le 260000 ] \
+      && sysctl -w vm.swappiness=100 \
+      || sysctl -w vm.swappiness=60
+
+else
+
+  sysctl -w vm.swappiness=0
+
+fi
+