File boot.compcache of Package compcache

#!/bin/sh
#
# System startup script loading compcache kernel module
# Copyright (C) 2008 Takashi Iwai <tiwai@suse.de>
#
# /etc/init.d/compcache
#
### BEGIN INIT INFO
# Provides:          compcache
# Required-Start:    boot.swap
# Required-Stop:     boot.swap
# Should-Start:      
# Should-Stop:
# Default-Start:     B
# Default-Stop:      B
# Description: Loads compcache - compressed RAM based swap device
### END INIT INFO

. /etc/rc.status
. /etc/sysconfig/compcache

SWAPON_BIN=/sbin/swapon
SWAPOFF_BIN=/sbin/swapoff
UDEVADM_BIN=/sbin/udevadm
MODPROBE_BIN=/sbin/modprobe
SWAPDEV=/dev/ramzswap0

is_comp_swap_on () {
    grep -q ramzswap /proc/swaps
    return $?
}

rc_reset

case "$1" in
    start|restart)
	test -z "$COMPCACHE_SIZE_KB" && COMPCACHE_SIZE_KB="0"
	if [ "$COMPCACHE_SIZE_KB" -lt 0 ]; then
	    rc_exit
	fi
	if [ "$COMPCACHE_SIZE_KB" = "0" ]; then
	    echo "No compcache size is given, using default 25% of RAM"
	    param=""
	else
	    param="disksize_kb=$COMPCACHE_SIZE_KB"
	fi
	echo -n "Loading ramzswap driver"
	$MODPROBE_BIN -q ramzswap &>/dev/null
	rc_status -v

	# /dev/ramzswap0 is not available immediately after insmod returns
	# So, let udev complete its work before we do swapon
	if [ ! -f $SWAPDEV ]; then
	    if [ -f "$UDEVADM_BIN" ]; then
		$UDEVADM_BIN settle
	    else
		sleep 2
	    fi
	fi

	# Set it as swap device with highest priority
	if ! is_comp_swap_on; then
	    echo -n "Setting up ramzswap swap device"
	    $SWAPON_BIN $SWAPDEV -p 100
	    rc_status -v
	fi
	;;
    stop)
	if is_comp_swap_on; then
	    echo -n "Turning off ramzswap swap device"
	    $SWAPOFF_BIN $SWAPDEV
	    rc_status -v
	fi
	echo -n "Unloading ramzswap module"
	$MODPROBE_BIN -qr ramzswap &>/dev/null
	rc_status -v
	;;
    restart)
	$0 stop
	$0 start
	;;
    status)
	echo -n "Checking for compcache "
	if is_comp_swap_on; then
	    rc_failed 0
	else
	    rc_failed 3
	fi
	rc_status -v
	;;
    *)
	echo "Usage: $0 {start|stop|status|restart}"
	exit 1
	;;
esac
rc_exit