#! /bin/sh
### BEGIN INIT INFO
# Provides:          MailScanner daemon
# 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: Controls mailscanner instances
# Description:       MailScanner is a queue-based spam/virus filter
### END INIT INFO

# Author: Simon Walter <simon.walter@hp-factory.de>

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/usr/sbin:/usr/bin:/bin:/sbin:/opt/MailScanner/bin
DESC="mail spam/virus scanner"
NAME=MailScanner
PNAME=mailscanner
DAEMON=/opt/MailScanner/bin/$NAME
STARTAS=MailScanner
SCRIPTNAME=/etc/init.d/$PNAME
CONFFILE=/opt/MailScanner/etc/MailScanner.conf


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

run_nice=0
stopped_lockfile=/var/lock/subsys/MailScanner.off

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

# 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

# sanity check for permissions
fail()
{
    echo >&2 "$0: $1"
    exit 1
}

check_dir()
{
    if [ ! -d $1 ]; then
        mkdir -p "$1" || \
            fail "directory $1: does not exist and cannot be created"
    fi
    actual="$(stat -c %U $1)"
    if [ "$actual" != "$2" ]; then
        chown -R "$2" "$1" || \
            fail "directory $1: wrong owner (expected $2 but is $actual)"
    fi
    actual="$(stat -c %G $1)"
    if [ "$actual" != "$3" ]; then
        chgrp -R "$3" "$1" || \
            fail "directory $1: wrong group (expected $3 but is $actual)"
    fi
}

user=$(echo $(awk -F= '/^Run As User/ {print $2; exit}' $CONFFILE))
group=$(echo $(awk -F= '/^Run As Group/ {print $2; exit}' $CONFFILE))

check_dir /var/spool/MailScanner       ${user:-mail} ${group:-mail}
check_dir /var/lib/MailScanner         ${user:-mail} ${group:-mail}
check_dir /var/run/MailScanner         ${user:-mail} ${group:-mail}
check_dir /var/lock/subsys/MailScanner ${user:-mail} ${group:-mail}

#
# 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 --startas $STARTAS --name $NAME --test > /dev/null \
                || return 1
        start-stop-daemon --start --quiet --nicelevel $run_nice --exec $DAEMON --name $NAME -- $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.

  # Set lockfile to inform cronjobs about the running daemon
        RETVAL="$?"
        if [ $RETVAL -eq 0 ]; then
            touch /var/lock/subsys/mailscanner
            rm -f $stopped_lockfile
        fi

}

#
# 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 --retry=TERM/30 --name $NAME
        RETVAL="$?"
        [ "$RETVAL" = 2 ] && return 2

  # Remove lockfile for cronjobs
        if [ $RETVAL -eq 0 ]; then
            rm -f /var/lock/subsys/mailscanner
            touch $stopped_lockfile
        fi

}

case "$1" in
  start)
        [ "$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
        ;;
  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|restart|force-reload}" >&2
        exit 3
        ;;
esac

exit 0