#! /bin/sh
### BEGIN INIT INFO
# Provides:          umountnfs
# Required-Start:
# Required-Stop:     umountfs
# Should-Stop:       $network $portmap nfs-common
# Default-Start:
# Default-Stop:      0 6
# Short-Description: Unmount all network filesystems except the root fs.
# Description:       Also unmounts all virtual filesystems (proc,
#                    devpts, usbfs, sysfs) that are not mounted at the
#                    top level.
### END INIT INFO

setvar PATH = "/sbin:/usr/sbin:/bin:/usr/bin"
setvar KERNEL = "$(uname -s)"
setvar RELEASE = "$(uname -r)"
source /lib/init/vars.sh

source /lib/lsb/init-functions

match "${KERNEL}:${RELEASE}" {
  with Linux:[01].*|Linux:2.[01].*
	setvar FLAGS = """"
	
  with Linux:2.[23].*|Linux:2.4.?|Linux:2.4.?-*|Linux:2.4.10|Linux:2.4.10-*
	setvar FLAGS = ""-f""
	
  with *
	setvar FLAGS = ""-f -l""
	
}

proc do_stop {
	# Write a reboot record to /var/log/wtmp before unmounting
	halt -w

	# Remove bootclean flag files (precaution against symlink attacks)
	rm -f /tmp/.clean /run/.clean /run/lock/.clean

	#
	# Make list of points to unmount in reverse order of their creation
	#

	setvar DIRS = """"
	while read -r DEV MTPT FSTYPE OPTS REST
	{
		match $MTPT {
		  with /|/proc|/dev|/dev/pts|/dev/shm|/proc/*|/sys|/run|/run/*
			continue
			
		}
		match $FSTYPE {
		  with nfs|nfs4|smbfs|ncp|ncpfs|cifs|coda|ocfs2|gfs|ceph
			setvar DIRS = ""$MTPT $DIRS""
			
		  with proc|procfs|linprocfs|devpts|usbfs|usbdevfs|sysfs
			setvar DIRS = ""$MTPT $DIRS""
			
		}
		match $OPTS {
		  with _netdev|*,_netdev|_netdev,*|*,_netdev,*
			setvar DIRS = ""$MTPT $DIRS""
			
		}
	} < /etc/mtab

	if test $DIRS
	{
		test $VERBOSE = no || log_action_begin_msg "Unmounting remote and non-toplevel virtual filesystems"
		fstab-decode umount $FLAGS $DIRS
		setvar ES = "$Status"
		test $VERBOSE = no || log_action_end_msg $ES
	}

	# emit unmounted-remote-filesystems hook point so any upstart jobs
	# that support remote filesystems can be stopped
	if test -x /sbin/initctl {
		initctl --quiet emit unmounted-remote-filesystems 2>/dev/null || true
	}
}

match $1 {
  with start|status
	# No-op
	
  with restart|reload|force-reload
	echo "Error: argument '$1' not supported" >&2
	exit 3
	
  with stop|""
	do_stop
	
  with *
	echo "Usage: umountnfs.sh [start|stop]" >&2
	exit 3
	
}

: