#! /bin/sh
### BEGIN INIT INFO
# Provides:          umountfs
# Required-Start:
# Required-Stop:     umountroot
# Default-Start:
# Default-Stop:      0 6
# Short-Description: Turn off swap and unmount all local file systems.
# Description:
### END INIT INFO

setvar PATH = "/sbin:/usr/sbin:/bin:/usr/bin"
source /lib/init/vars.sh

source /lib/lsb/init-functions

umask 022

proc do_stop {
	setvar PROTECTED_MOUNTS = "$(sed -n ':a;/^[^ ]* \/ /!{H;n;ba};{H;s/.*//;x;s/\n//;p}' /proc/mounts)"
	setvar WEAK_MTPTS = """" # be gentle, don't use force
	setvar REG_MTPTS = """"
	setvar TMPFS_MTPTS = """"
	while read -r DEV MTPT FSTYPE REST
	{
		echo $PROTECTED_MOUNTS | grep -qs "^$DEV $MTPT " && continue
		match $MTPT {
		  with /|/proc|/dev|/.dev|/dev/pts|/dev/shm|/dev/.static/dev|/proc/*|/sys|/sys/*|/run|/run/*|/dev/vcs
			continue
			
		}
		match $FSTYPE {
		  with proc|procfs|linprocfs|sysfs|usbfs|usbdevfs|devpts
			continue
			
		  with tmpfs
			setvar TMPFS_MTPTS = ""$MTPT $TMPFS_MTPTS""
			
		  with *
			if echo $PROTECTED_MOUNTS | grep -qs "^$DEV " {
				setvar WEAK_MTPTS = ""$MTPT $WEAK_MTPTS""
			} else {
				setvar REG_MTPTS = ""$MTPT $REG_MTPTS""
			}
			
		}
	} < /proc/mounts

	#
	# Make sure tmpfs file systems are umounted before turning off
	# swap, to avoid running out of memory if the tmpfs filesystems
	# use a lot of space.
	#
	if test $TMPFS_MTPTS
	{
		if test $VERBOSE = no
		{
			log_action_begin_msg "Unmounting temporary filesystems"
			fstab-decode umount $TMPFS_MTPTS
			log_action_end_msg $Status
		} else {
			log_daemon_msg "Will now unmount temporary filesystems"
			fstab-decode umount -v $TMPFS_MTPTS
			log_end_msg $Status
		}
	}

	#
	# Deactivate swap
	#
	if test $VERBOSE = no
	{
		log_action_begin_msg "Deactivating swap"
		swapoff -a >/dev/null
		log_action_end_msg $Status
	} else {
		log_daemon_msg "Will now deactivate swap"
		swapoff -a -v
		log_end_msg $Status
	}

	#
	# Unmount local filesystems
	#
	if test $WEAK_MTPTS {
		# Do not use -f umount option for WEAK_MTPTS
		if test $VERBOSE = no
		{
			log_action_begin_msg "Unmounting weak filesystems"
			fstab-decode umount -r -d $WEAK_MTPTS
			log_action_end_msg $Status
		} else {
			log_daemon_msg "Will now unmount weak filesystems"
			fstab-decode umount -v -r -d $WEAK_MTPTS
			log_end_msg $Status
		}
	}
	if test $REG_MTPTS
	{
		if test $VERBOSE = no
		{
			log_action_begin_msg "Unmounting local filesystems"
			fstab-decode umount -f -r -d $REG_MTPTS
			log_action_end_msg $Status
		} else {
			log_daemon_msg "Will now unmount local filesystems"
			fstab-decode umount -f -v -r -d $REG_MTPTS
			log_end_msg $Status
		}
	}
}

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: $0 start|stop" >&2
	exit 3
	
}

: