#!/bin/sh

### BEGIN INIT INFO
# Provides:             nsd-updated
# Required-Start:       $remote_fs $syslog nsd
# Required-Stop:        $remote_fs $syslog
# Default-Start:        2 3 4 5
# Default-Stop:         0 1 6
# Short-Description:    watch fifo for updates to nsd zone files
### END INIT INFO

set -Ceu

# Sanitize our environment a little, out of paranoia.
unset IFS
PATH=/sbin:/bin:/usr/bin

fifowatchd='@SBINDIR@/fifowatchd'
nsd_update='@SBINDIR@/nsd-update'
logger='@LOGGER@'

pidfile='@STATEDIR@/nsd-updated.pid'
nsd_update_fifo='@STATEDIR@/nsd-update.fifo'
nsd_updated_flags="-n nsd-updated -d 60"

# Fail silently if the executables of interest don't exist, per the
# Debian policy manual.  This seems silly, but it's the policy.
test -x "$fifowatchd" || exit 0
test -x "$nsd_update" || exit 0

. /lib/lsb/init-functions

do_start ()
{
    start-stop-daemon --start --quiet --oknodo --pidfile "$pidfile" \
        --exec "$fifowatchd" -- -p "$pidfile" $nsd_updated_flags \
            "$nsd_update_fifo" \
            /bin/sh -c \
                "'$nsd_update' 2>&1 | '$logger' -t nsd-update -p daemon.notice"
}

do_stop ()
{
    start-stop-daemon --stop --quiet --oknodo --pidfile "$pidfile"
}

case $1 in
    start)
        if [ ! -e "$nsd_update_fifo" ]; then
            log_begin_msg "creating fifo: $nsd_update_fifo"
            if mkfifo -m 0622 -- "$nsd_update_fifo"; then
                log_end_msg 0
            else
                log_end_msg $?
            fi
        else
            if [ ! -p "$nsd_update_fifo" ]; then
                log_failure_msg "not a fifo: $nsd_update_fifo"
                exit 1
            fi
        fi
        log_daemon_msg 'Starting nsd update daemon' nsd-updated
        if do_start; then
            log_end_msg 0
        else
            log_end_msg $?
        fi
        ;;

    force-reload | reload | restart)
        log_daemon_msg 'Restarting nsd update daemon' nsd-updated
        if do_stop; then
            if do_start; then
                log_end_msg 0
            else
                log_end_msg $?
            fi
        else
            log_daemon_msg $?
        fi
        ;;

    stop)
        log_daemon_msg 'Stopping nsd-updated' nsd-updated
        if do_stop; then
            log_end_msg 0
        else
            log_end_msg $?
        fi
        ;;

    status)
        status_of_proc -p "$pidfile" "$fifowatchd" nsd-updated
        ;;

    *)
        log_action_msg \
            'Usage: /etc/init.d/nsd-updated {start|reload|force-reload|restart|stop|status}'
        exit 1
        ;;
esac