s390-tools/xpram

#! /bin/sh
# Copyright (c) 2004 SUSE LINUX AG Nuernberg, Germany.
#
# Submit feedback to http://www.suse.de/feedback/
#
# /etc/init.d/xpram
#
#   and symbolic its link
#
# /use/sbin/rcxpram
#
# System startup script for XPRAM device driver
#
### BEGIN INIT INFO
# Provides: xpram
# Required-Start: $remote_fs
# Required-Stop:  $null
# Default-Start:  3 5
# Default-Stop:   0 1 6
# Short-Description:    XPRAM device driver
# Description:    Creates an xpram device and mounts it
### END INIT INFO
#

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:
	rc_failed 6
	rc_status -v
	return 6
    fi
}

prepare_xpram() {
    if [ -z "$XPRAM_MNTPATH" -o -z "$XPRAM_DEVNODE" ]; then
        echo -n "Cannot mkfs/mount XPRAM: Missing parameters! "
        rc_failed 6
        rc_status -v
        rc_exit
    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!"
        rc_failed 6
        rc_status -v
        rc_exit
    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 $?"
            rc_failed 6
            rc_status -v
            rc_exit
        fi
    fi
}

# Shell functions sourced from /etc/rc.status:
#      rc_check         check and set local and overall rc status
#      rc_status        check and set local and overall rc status
#      rc_status -v     ditto but be verbose in local rc status
#      rc_status -v -r  ditto and clear the local rc status
#      rc_failed        set local and overall rc status to failed
#      rc_failed <num>  set local and overall rc status to <num><num>
#      rc_reset         clear local rc status (overall remains)
#      rc_exit          exit appropriate to overall rc status
. /etc/rc.status

# First reset status of this service
config_read=0
rc_reset

# 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! "
	rc_failed 6
	rc_status -v
	rc_exit
    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.
	rc_exit
    fi
}

check_enabled() {
    if [ "$XPRAM_START" != "yes" ]; then
	rc_failed 6
	if [ "$XPRAM_MODULE" ]; then
	    if grep -q "$XPRAM_MODULE" /proc/modules; then
		echo -n "Service $service $_rc_todo "
		rc_status -v
	    fi
	fi
	rc_exit
    fi
}

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

	check_enabled
	quit_disabled
	check_config

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

	# Remember status and be verbose
	rc_status -v
	;;
    stop)
        # Read in configuration
        read_config_file || rc_exit

	# 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"
		rc_status
	else
		rc_failed 7
	fi

	# Remember status and be verbose
	rc_status -v
	;;
    try-restart)
	## Stop the service and if this succeeds (i.e. the 
	## service was running before), start it again.
	## Note: try-restart is not (yet) part of LSB (as of 0.7.5)
	$0 status >/dev/null &&  $0 restart

	# Remember status and be quiet
	rc_status
	;;
    restart)
	## Stop the service and regardless of whether it was
	## running or not, start it again.
	$0 stop
	$0 start

	# Remember status and be quiet
	rc_status
	;;
    force-reload)
	echo -n "Force-reload $service "

	$0 stop  &&  $0 start
	rc_status
	;;
    reload)
	echo -n "Reloading $service not supported."
	
	## it does not support reload:
	rc_failed 3
	rc_status -v
	;;
    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 || rc_exit

	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"
		    rc_failed 3
		fi
	    fi
	else
	    rc_failed 3
	fi

	rc_status -v
	;;
    *)
	echo "Usage: $0 {start|stop|status|try-restart|restart}"
	exit 1
	;;
esac
rc_exit