#! /bin/sh
# Copyright (c) 2004 SUSE LINUX AG Nuernberg, Germany.
#
# Submit feedback to http://www.suse.de/feedback/
#
# System startup script for XPRAM device driver

XPRAM_CONFIG_FILE=/etc/sysconfig/xpram

read_config_file() {
    if [ config_read = 1 ]; then
	return 0
    fi
    file=$XPRAM_CONFIG_FILE
    
    if [ -s "$file" ]; then
	source $file
	config_read=1
    else
	echo -ne "Cannot read $file: empty or nonexistant! "
	# Means not configured:
	return 6
    fi
}

prepare_xpram() {
    if [ -z "$XPRAM_MNTPATH" -o -z "$XPRAM_DEVNODE" ]; then
        echo -n "Cannot mkfs/mount XPRAM: Missing parameters! "
         exit 6
    fi
    grep -q $XPRAM_DEVNODE /proc/mounts 2>&1 > /dev/null
    if [ $? -eq 0 ] ; then
        echo -n "$service: $XPRAM_DEVNODE already mounted! "
        return
    fi
    current_fstype=`vol_id -t $XPRAM_DEVNODE 2> /dev/null`
    if [ $? -ne 0 -o "$XPRAM_FORCE" = "yes" ]
    then
#		Does not contain a valid filesystem/swap space
        if [ "$XPRAM_FSTYPE" = swap ]
        then
            mkswap $XPRAM_DEVNODE
        else
            mkfs -t "$XPRAM_FSTYPE" -b 4096 "$XPRAM_DEVNODE"
        fi
        sleep 1 # workaround
        current_fstype=$XPRAM_FSTYPE
    fi
    if [ ! "$current_fstype" = "$XPRAM_FSTYPE" ]
    then
        echo
        echo -n "Warning: current filessystem and configured filesystem are not the same!"
        exit 6
    fi
    if [ "$XPRAM_FSTYPE" = swap ]
    then
        if [ "$XPRAM_SWAP_PRI" = "" ]
        then
            swapon $XPRAM_DEVNODE
        else
            swapon -p $XPRAM_SWAP_PRI $XPRAM_DEVNODE
        fi
    else
        if [ ! -d "$XPRAM_MNTPATH" ]
        then
            mkdir -p "$XPRAM_MNTPATH"
        fi
        mount "$XPRAM_DEVNODE" "$XPRAM_MNTPATH"
        if [ $? -ne 0 ]
        then
            echo -n "Mount failed with error code $?"
            exit 6 
        fi
    fi
}

# Return values acc. to LSB for all commands but status:
# 0 - success
# 1 - generic or unspecified error
# 2 - invalid or excess argument(s)
# 3 - unimplemented feature (e.g. "reload")
# 4 - insufficient privilege
# 5 - program is not installed
# 6 - program is not configured
# 7 - program is not running
# 
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signalling is not supported) are
# considered a success.

check_config () {
    if [ -z "$XPRAM_MODULE" ]; then
	echo -n "$file: parameters XPRAM_MODULE missing! "
	exit 6
    fi
}

quit_disabled() {
    if [ "$XPRAM_START" != "yes" ]; then
	# Config file exists but xpram not enabled, do not complain,
	# but note with exit status 6 that we are not configured.
	echo "xpram not enabled"
	exit 0
    fi
}

service="xpram"
case "$1" in
    start)
        # Read in configuration
        read_config_file || exit 6

	quit_disabled
	check_config

	echo -n "Creating $service device "
	modprobe "$XPRAM_MODULE"
	if [ $? -ne 0 ]; then
	    echo -n "- failed to load $XPRAM_MODULE "
	    exit 1
	else
	    prepare_xpram
	fi

	;;
    stop)
        # Read in configuration
        read_config_file || exit 6

	# check_enabled
	# quit_disabled

	echo -n "Removing $service device "

	check_config

	if [ "$XPRAM_DEVNODE" ]; then
	    if grep -q $XPRAM_DEVNODE /proc/mounts; then
		umount $XPRAM_DEVNODE
	    fi
	    if swapon -s | grep -q $XPRAM_DEVNODE; then
		swapoff $XPRAM_DEVNODE
	    fi
	fi

	if grep -q "$XPRAM_MODULE" /proc/modules; then
		rmmod "$XPRAM_MODULE"
	else
		exit 7
	fi

	;;
    status)
	echo -n "Checking $service "

	# Status has a slightly different meaning for the status command:
	# 0 - service running
	# 1 - service dead, but /var/run/  pid  file exists
	# 3 - service not running

        # Read in configuration
        read_config_file || exit 3

	check_config

	lsmod | grep -q $XPRAM_MODULE 
	if [ $? -eq 0 ]; then
	    if [ "$XPRAM_DEVNODE" ]; then
		if ! grep -q $XPRAM_DEVNODE /proc/mounts && ! swapon -s | grep -q $XPRAM_DEVNODE; then
		    xpram_result=3
		    echo -n "loaded, but $XPRAM_DEVNODE not used"
		    exit 3
		fi
	    fi
	else
	    exit 3
	fi

	;;
esac