#!/bin/sh
# By Scott Boone <scottboone@mac.com> and
# Joshua Schrier <jschrier@mac.com> for SwapCop
# May 14, 2002

. /etc/rc.common

##
# First check to be sure the pager isn't already running.
# It might be if /etc/rc was changed. (OSX upgrade perhaps?)
# The dynamic_pager line should be commented out in /etc/rc
# (In simpler terms, insert a # at the beginning of the line.)
# Added benefit: leaving /etc/rc VM actions intact will automatically 
#    clear the default swapfiles for us at next reboot
##

PAGERPID=`ps -ax | grep dynamic_pager | grep -v grep | awk '{print $1}'`

if [ ! $PAGERPID ]; then

##
# Start the virtual memory system.
##
# This is basically Apple's code, except:
# 1- the addition of quotes around the variables
#    (to allow for spaces in volumes and folders in the swapfile path)
# 2- set swapdir based on a VIRTUALMEMORY variable in /etc/hostconfig
#    VIRTUALMEMORY="/Volumes/Your Volume Here/.vm"
#    (note the quotes--they are important, see above...)
#    If /etc/hostconfig gets altered, VM will default automatically
##
 	
 	ConsoleMessage "Custom Starting virtual memory"
	
	swapdir="${VIRTUALMEMORY:=/private/var/vm}"
	
	# Make sure the swapfile exists
	if [ ! -d "${swapdir}" ]; then
	    ConsoleMessage "Creating alternative swap directory"
	    mount -uw /
	    mkdir -p -m 755 "${swapdir}"
	    chown root:wheel "${swapdir}"
	else
    	rm -rf "${swapdir}"/swap*
	fi
	   
# Default: 80MB
#	dynamic_pager -H 40000000 -L 160000000 -S 80000000 -F "${swapdir}"/swapfile

# Custom: 512MB
	dynamic_pager -H 268435456 -L 1073741824 -S 536870912 -F "${swapdir}"/swapfile
	
else

	ConsoleMessage "Check /etc/rc -- VM already running!"

fi