#!/bin/sh

### BEGIN INIT INFO
# Provides:          nfs-common
# Required-Start:    $time
# Required-Stop:     $time
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: NFS support files common to client and server
# Description:       NFS is a popular protocol for file sharing across
#		     TCP/IP networks. This service provides various
#                    support functions for NFS mounts.
### END INIT INFO

# What is this?
DESC="NFS common utilities"

# Read config
DEFAULTFILE=/etc/default/nfs-common
PREFIX=
NEED_LOCKD=
NEED_IDMAPD=
NEED_GSSD=
PIPEFS_MOUNTPOINT=/var/lib/nfs/rpc_pipefs
RPCGSSDOPTS=
if [ -f $DEFAULTFILE ]; then
    . $DEFAULTFILE
fi

. /lib/lsb/init-functions

# Determine whether lockd daemon is required.
case "$NEED_LOCKD" in
yes|no)	;;
*)  case `uname -r` in
    '' | [01].* | 2.[0123].* )
	# Older kernels may or may not need a lockd daemon.
	# We must assume they do, unless we can prove otherwise.
	# (A false positive here results only in a harmless message.)
	NEED_LOCKD=yes
	if test -f /proc/ksyms
	then
	    grep -q lockdctl /proc/ksyms || NEED_LOCKD=no
	fi
	;;

    *)  # Modern kernels (>= 2.4) start a lockd thread automatically.
	NEED_LOCKD=no
	;;
    esac
    ;;
esac

#
# Parse the fstab file, and determine whether we need idmapd and gssd. (The
# /etc/defaults settings, if any, will override our autodetection.) This code
# is partially adapted from the mountnfs.sh script in the sysvinit package.
#
AUTO_NEED_IDMAPD=no
AUTO_NEED_GSSD=no

exec 9<&0 </etc/fstab

while read DEV MTPT FSTYPE OPTS REST
do
    if [ "$FSTYPE" = "nfs4" ]; then
        AUTO_NEED_IDMAPD=yes
    fi
    case "$OPTS" in
        sec=krb5|*,sec=krb5|sec=krb5,*|*,sec=krb5i,*|sec=krb5i|*,sec=krb5i|sec=krb5i,*|*,sec=krb5i,*|sec=krb5p|*,sec=krb5p|sec=krb5p,*|*,sec=krb5p,*)
	    AUTO_NEED_GSSD=yes
	;;
    esac
done

exec 0<&9 9<&-

#
# We also need idmapd if we run an NFSv4 server. It's fairly difficult
# to autodetect whether there are NFSv4 exports or not, and idmapd is not a
# particularily heavy daemon, so we auto-enable it if we find an /etc/exports
# file. This does not mean that there are NFSv4 or other mounts active (or
# even that nfs-kernel-server is installed), but it matches what the "start"
# condition in nfs-kernel-server's init script does, which has a value in
# itself.
#
if [ -f /etc/exports ]; then
    AUTO_NEED_IDMAPD=yes
fi


case "$NEED_IDMAPD" in
    yes|no)	
        ;;
    *)
        NEED_IDMAPD=$AUTO_NEED_IDMAPD
	;;
esac

case "$NEED_GSSD" in
    yes|no)	
        ;;
    *)
        NEED_GSSD=$AUTO_NEED_GSSD
	;;
esac

# Exit if required binaries are missing.
[ -x $PREFIX/sbin/rpc.statd ] || exit 0
[ -x $PREFIX/sbin/rpc.lockd ] || [ "$NEED_LOCKD"  = no ] || exit 0
[ -x /usr/sbin/rpc.idmapd   ] || [ "$NEED_IDMAPD" = no ] || exit 0
[ -x /usr/sbin/rpc.gssd     ] || [ "$NEED_GSSD"   = no ] || exit 0

do_modprobe() {
    if [ -x /sbin/modprobe -a -f /proc/modules ]
    then
        modprobe -q "$1" || true
    fi
}

do_mount() {
    if ! grep -E -qs "$1\$" /proc/filesystems
    then
	return 1
    fi
    if ! mountpoint -q "$2"
    then
	mount -t "$1" "$1" "$2"
	return
    fi
    return 0
}

do_umount() {
    if mountpoint -q "$1"
    then
	umount "$1"
    fi
    return 0
}

# See how we were called.
case "$1" in
  start)
	log_daemon_msg "Starting $DESC"

	log_progress_msg "statd"
	start-stop-daemon --start --oknodo --quiet \
	    --exec $PREFIX/sbin/rpc.statd -- $STATDOPTS
	if [ $? != 0 ]; then
	    log_end_msg $?
	    exit $?
	fi

	if [ "$NEED_LOCKD" = yes ]
	then
	    log_progress_msg "lockd"
	    start-stop-daemon --start --oknodo --quiet \
		--exec $PREFIX/sbin/rpc.lockd
	    if [ $? != 0 ]; then
	        log_end_msg $?
	        exit $?
            fi
	fi
	if [ "$NEED_IDMAPD" = yes ] || [ "$NEED_GSSD" = yes ]
	then
	    do_modprobe nfs
	    do_modprobe nfs4
	    if do_mount rpc_pipefs $PIPEFS_MOUNTPOINT
	    then
	    	if [ "$NEED_IDMAPD" = yes ]
		then
	            log_progress_msg "idmapd"
		    start-stop-daemon --start --oknodo --quiet \
			    --exec /usr/sbin/rpc.idmapd
	            if [ $? != 0 ]; then
        	        log_end_msg $?
        	        exit $?
                    fi
		fi
		if [ "$NEED_GSSD" = yes ]
		then
		    do_modprobe rpcsec_gss_krb5
	            log_progress_msg "gssd"

	            # we need this available; better to fail now than
		    # mysteriously on the first mount
		    if ! grep -q -E '^nfs[	 ]' /etc/services; then
		    	log_action_end_msg 1 "broken /etc/services, please see /usr/share/doc/nfs-common/README.Debian.nfsv4"
			exit 1
		    fi

		    start-stop-daemon --start --oknodo --quiet \
			    --exec /usr/sbin/rpc.gssd -- $RPCGSSDOPTS
	            if [ $? != 0 ]; then
        	        log_end_msg $?
        	        exit $?
                    fi
		fi
	    fi
	fi
	log_end_msg 0
	;;

  stop)
	log_daemon_msg "Stopping $DESC"

	if [ "$NEED_GSSD" = yes ]
	then
	    log_progress_msg "gssd"
	    start-stop-daemon --stop --oknodo --quiet \
		    --name rpc.gssd
	    if [ $? != 0 ]; then
                log_end_msg $?
                exit $?
            fi
	fi
	if [ "$NEED_IDMAPD" = yes ]
	then
	    log_progress_msg "idmapd"
	    start-stop-daemon --stop --oknodo --quiet \
		--name rpc.idmapd
	    if [ $? != 0 ]; then
                log_end_msg $?
                exit $?
            fi
	fi
	if [ "$NEED_LOCKD" = yes ]
	then
	    log_progress_msg "lockd"
	    start-stop-daemon --stop --oknodo --quiet \
		--name rpc.lockd
	    if [ $? != 0 ]; then
                log_end_msg $?
                exit $?
            fi
	else
	    pkill -KILL -u root -x lockd || true
	fi
	log_progress_msg "statd"
	start-stop-daemon --stop --oknodo --quiet \
	    --name rpc.statd
	if [ $? != 0 ]; then
            log_end_msg $?
            exit $?
        fi
	do_umount $PIPEFS_MOUNTPOINT 2>/dev/null || true
	log_end_msg 0
	;;

  status)
	if ! pidof rpc.statd >/dev/null
	then
	    echo "rpc.statd not running"
	    exit 3
	fi

	if [ "$NEED_GSSD" = yes ]
	then
            if ! pidof rpc.gssd >/dev/null
	    then
		echo "rpc.statd running, but rpc.gssd halted"
		exit 3
	    fi
	fi

	if [ "$NEED_LOCKD" = yes ]
	then
	    if ! pidof rpc.lockd >/dev/null
	    then
		echo "rpc.statd running, but rpc.lockd halted"
		exit 3
	    fi
	fi
	    
	if [ "$NEED_IDMAPD" = yes ]
	then
            if ! pidof rpc.idmapd >/dev/null
	    then
		echo "rpc.statd running, but rpc.idmapd halted"
		exit 3
	    fi
	fi

	echo "rpc.statd running"
	exit 0
	;;

  restart | force-reload)
	$0 stop
	sleep 1
	$0 start
	;;

  *)
	log_success_msg "Usage: nfs-common {start|stop|status|restart}"
	exit 1
	;;
esac

exit 0