#! /bin/sh
### BEGIN INIT INFO
# Provides:          hdapsd
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: initscript to start hdapsd
# Description:       This file starts the hdapsd daemon
### END INIT INFO

# Author: Evgeni Golov <sargentd@die-welt.net>

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="IBM Hard Disk Active Protection System (HDAPS) daemon"
NAME=hdapsd
DAEMON=/usr/sbin/$NAME
DAEMON_ARGS=""
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
START="no"
DISK="sda"
SENSITIVITY=15
OPTIONS=""
FORCEENABLE="no"

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Do we really want to start the daemon?
[ "$START" = "yes" ] || exit 0

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

DAEMON_ARGS="-p$PIDFILE -d $DISK -s $SENSITIVITY -b $OPTIONS"
if [ "$FORCEENABLE" = "yes" ]; then
	DAEMON_ARGS="$DAEMON_ARGS -f"
fi

#
# Function that checks if /sys/block/$DISK/queue/protect
# or /sys/block/$DISK/device/unload_heads exist
#
do_checkprotect()
{
	if [ ! -f /sys/block/$DISK/queue/protect -a ! -f /sys/block/$DISK/device/unload_heads ]; then
		log_warning_msg "Not starting $NAME: neither /sys/block/$DISK/queue/protect nor /sys/block/$DISK/device/unload_heads do exist, please read /usr/share/doc/hdapsd/README.Debian"
		exit 0
	fi
}

#
# Function that starts the daemon/service
#
do_start()
{
	# Return
	#   0 if daemon has been started
	#   1 if daemon was already running
	#   2 if daemon could not be started
	start-stop-daemon --start --quiet --exec $DAEMON --test > /dev/null \
		|| return 1
	start-stop-daemon --start --quiet --exec $DAEMON -- $DAEMON_ARGS \
		|| return 2
	# Add code here, if necessary, that waits for the process to be ready
	# to handle requests from services started subsequently which depend
	# on this one.  As a last resort, sleep for some time.
}

#
# Function that stops the daemon/service
#
do_stop()
{
	# Return
	#   0 if daemon has been stopped
	#   1 if daemon was already stopped
	#   2 if daemon could not be stopped
	#   other if a failure occurred
	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
	RETVAL="$?"
	[ "$RETVAL" = 2 ] && return 2
	# Wait for children to finish too if this is a daemon that forks
	# and if the daemon is only ever run from this initscript.
	# If the above conditions are not satisfied then add some other code
	# that waits for the process to drop all resources that could be
	# needed by services started subsequently.  A last resort is to
	# sleep for some time.
	start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
	[ "$?" = 2 ] && return 2
	# Many daemons don't delete their pidfiles when they exit.
	rm -f $PIDFILE
	return "$RETVAL"
}

#
# Function that sends a SIGUSR1 to the daemon/service
#
do_pause() {
	start-stop-daemon --stop --signal 10 --quiet --pidfile $PIDFILE --name $NAME
	return 0
}

case "$1" in
  start)
	do_checkprotect
	[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
	do_start
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  stop)
	[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
	do_stop
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
 status)
	status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
	;;
  pause) 
	[ "$VERBOSE" != no ] && log_daemon_msg "Pauseing (8sec) $DESC" "$NAME"
	do_pause
	;;
  restart|force-reload)
	#
	# If the "reload" option is implemented then remove the
	# 'force-reload' alias
	#
	log_daemon_msg "Restarting $DESC" "$NAME"
	do_stop
	case "$?" in
	  0|1)
		do_start
		case "$?" in
			0) log_end_msg 0 ;;
			1) log_end_msg 1 ;; # Old process is still running
			*) log_end_msg 1 ;; # Failed to start
		esac
		;;
	  *)
	  	# Failed to stop
		log_end_msg 1
		;;
	esac
	;;
  *)
	echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload|pause}" >&2
	exit 3
	;;
esac

:
