#!/bin/sh
#
# I *love* RCS
#
# $Source: /home/alb/afbackup/afbackup-3.5.3/RCS/init.afbackup.in,v $
# $Id: init.afbackup.in,v 1.1 2007/11/14 21:12:27 alb Exp alb $
#
# chkconfig: - 95 05
# description: Starts and stops the afbackup multi stream daemon
# config: /etc/afbackup/afserver.conf
#
### BEGIN INIT INFO
# Provides: afbackup
# Should-Start: $network $remote_fs
# Should-Stop: $network $remote_fs
# Default-Start: 3 4 5
# Short-Description: afbackup multi stream daemon
# Description: afbackup multi stream daemon
### END INIT INFO

CONFIGFILE=/etc/afbackup/afserver.conf

VARDIR=/var/lib/afbackup

CFVARDIR=`egrep '^[ 	]*[Vv][Aa][Rr][-_ 	]*[Dd]ire?c?t?o?r?y?:?[ 	]*' "$CONFIGFILE" 2>/dev/null | sed 's/^[ 	]*[Vv][Aa][Rr][-_ 	]*[Dd]ir[^ 	]*[ 	]*//g' | tail -1`
if [ `echo "$CFVARDIR" | wc -w` -gt 0 ] ; then
  VARDIR="$CFVARDIR"
fi

PIDFILE="$VARDIR"/afmserver.pid

set_start_user(){
  VARDIROWNER=`/bin/ls -ldL "$VARDIR" 2>/dev/null | awk '{print $3}'`
  if [ `echo "$VARDIROWNER" | wc -w` -lt 1 ] ; then
    echo "WARNING: Cannot determine owner of directory $VARDIR" >&2
    VARDIROWNER=""
  fi

  DEVICEOWNER=""
  DEVICE=`egrep '^[ 	]*[Bb]ackup[-_ 	]*[Dd]evi?c?e?s?:?[ 	]*' "$CONFIGFILE" 2>/dev/null | sed 's/^[ 	]*[Bb]ackup[-_ 	]*[Dd]ev[^ 	]*[ 	]*//g' | tail -1 | awk '{print $1}' | sed 's/[@#^=].*$//g'`
  if [ _"$DEVICE" = _- ] ; then
    DEVICEOWNER='-'
  else
    DEVICEENTRY=`/bin/ls -lLd "$DEVICE" 2>/dev/null`
    if [ $? -ne 0 ] ; then
      # Probably the device is a symlink to a directory, that does not
      # (yet) exist. In this case, the base directory must exist and be
      # owned by the backup server user
      #
      if [ _`/bin/ls -l "$DEVICE" | cut -c1` = _l ] ; then
	DEVDIR=`dirname "$DEVICE"`
	RESOLVED=`/bin/ls -l "$DEVICE" | sed 's/^.* -> *//g'`
	TDEVDIR=`dirname "$RESOLVED"`
	DEVICEENTRY=`( cd "$DEVDIR" && /bin/ls -lLd "$TDEVDIR" ) 2>/dev/null`
	if [ $? -ne 0 ] ; then
	  DEVICEENTRY=""
	fi
      fi
    fi
    if [ _"$DEVICEENTRY" != _ ] ; then
      DEVICEOWNER=`echo "$DEVICEENTRY" | awk '{print $3}'`
    else
      echo "WARNING: Cannot determine owner of backup device $DEVICE" >&2
    fi
  fi

  STARTUSER=root
  if [ _"$DEVICEOWNER" != _ -a _"$VARDIROWNER" != _ ] ; then
    if [ _"$DEVICEOWNER" != _"$VARDIROWNER" -a _"$DEVICEOWNER" != _- ] ; then
      echo "WARNING: Owner of $VARDIR and of $DEVICE differ. Must start as root to be operational." >&2
    else
      STARTUSER="$VARDIROWNER"
    fi
  else
    echo "WARNING: Some ownership could not be determined. Must start as root to be operational." >&2
  fi
}

#
# cheap trick, might fail, then set PS properly
#
PS="ps uxawwww"
$PS >/dev/null 2>&1
if [ $? -ne 0 ] ; then
  PS="ps -uxawwww"
  $PS >/dev/null 2>&1
  if [ $? -ne 0 ] ; then
    PS="ps -ef"
  fi
fi

check_running(){
  PID=''
  if [ -f "$PIDFILE" ] ; then
    for P in `fuser "$PIDFILE" 2>&1 | awk '{for(i=1;i<=NF;i++)if($i ~ /[0-9]/ && $i !~ /\//) print $i }' | sed 's/[^0-9]//g'` ; do
      if $PS | awk '$2 == "'"$P"'" {print $0}' | egrep '[ 	/]afmserver([ 	].*)?$' >/dev/null ; then
	PID="$P"
	break
      fi
    done
    if [ `echo "$PID" | wc -w` -lt 1 ] ; then
      PID=`cat "$PIDFILE" 2>/dev/null`
      echo "$PID" | grep '^[0-9][0-9]*$' >/dev/null
      if [ $? -ne 0 ] ; then
	PID=''
      fi
    fi
  fi
  if [ `echo "$PID" | wc -w` -lt 1 ] ; then
    PID=`$PS|grep -v grep|egrep '[ 	/]afmserver([ 	].*)?$' |grep -v init.d|awk '{print $2}'`
  fi
  if [ `echo "$PID" | wc -w` -gt 0 ] ; then
    echo "$PID"
    $PS | awk '$2 == "'"$PID"'" {print $0}' | egrep '[ 	/]afmserver([ 	].*)?$' >/dev/null
    if [ $? -eq 0 ] ; then
	return 1
    fi
  fi
  return 0
}

case "$1" in
    start)
	PID=`check_running`
	if [ $? -gt 0 ] ; then
		echo "An AF-Backup server seems to be already running with PID $PID"
		exit 0
	fi

	set_start_user
	echo "Starting AF-Backup multi stream server as user $STARTUSER."

        su "$STARTUSER" -c "/usr/sbin/afmserver -d -p afmbackup $CONFIGFILE"
	sleep 1

	check_running >/dev/null
	if [ $? -lt 1 ] ; then
		echo "Could not start the AF-Backup server. Check the logs for errors."
		exit 2
	fi

	;;

    stop)
	PID=`check_running`
	if [ $? -gt 0 ] ; then
		echo "Stopping AF-Backup multi stream server."
		kill $PID
		I=0
		while true ; do
			check_running >/dev/null
			if [ $? -lt 1 ] ; then
				break
			fi
			I=`expr $I + 1`
			if [ $I -gt 30 ] ; then
				echo "AF-Backup multi stream server could not be stopped within 30 seconds. Doing hard kill."
				kill -9 $PID
				break
			fi
			sleep 1
		done
	else
		echo "AF-Backup multi stream server not running."
	fi

	;;

    *)
	echo "Usage: $0 {start|stop}"

	exit 1

	;;
esac

exit 0