#!/bin/bash
#
# halt          This file is executed by init when it goes into runlevel
#               0 (halt) or runlevel 6 (reboot). It kills all processes,
#               unmounts file systems and then either halts or reboots.
#
# Author:       Miquel van Smoorenburg, <miquels@drinkel.nl.mugnet.org>
#               Modified for RHS Linux by Damien Neil
#

NOLOCALE=1
. /etc/init.d/functions

runcmd() {
   echo -n "$1 "
   shift
   if [ "$BOOTUP" = "color" ]; then
      $* && echo_success || echo_failure
   else
      $*
   fi
   echo
}

halt_get_remaining() {
	awk '$2 ~ /^\/$|^\/proc|^\/dev/{next}
	     $3 == "tmpfs" || $3 == "proc" {print $2 ; next}
	     /(^#|loopfs|autofs|sysfs|devfs|^none|^\/dev\/ram|^\/dev\/root)/ {next}
	     {print $2}' /proc/mounts
}

# See how we were called.
case "$0" in
   *halt)
	message=$"Halting system..."
	command="/sbin/halt"
	;;
   *reboot)
	message=$"Please stand by while rebooting the system..."
	command="/sbin/reboot"
	;;
   *)
	echo $"$0: call me as 'halt' or 'reboot' please!"
	exit 1
	;;
esac
case "$1" in
   *start)
   	;;
   *)
	echo $"Usage: $0 {start}"
	exit 1
	;;
esac

# Kill all processes.
[ "${BASH+bash}" = bash ] && enable kill

runcmd $"Sending all processes the TERM signal..." /sbin/killall5 -15
sleep 5
runcmd $"Sending all processes the KILL signal..."  /sbin/killall5 -9

# Write to wtmp file before unmounting /var
/sbin/halt -w

# Save mixer settings, here for lack of a better place.
grep -q "\(alsa\)" /proc/devices
if [ $? = 0 -a -x /usr/sbin/alsactl ]; then
   runcmd $"Saving mixer settings" alsactl store
fi

# Save random seed
touch /var/lib/random-seed
chmod 600 /var/lib/random-seed
runcmd $"Saving random seed: " dd if=/dev/urandom of=/var/lib/random-seed count=1 bs=512 2>/dev/null

# Sync the system clock.
ARC=0
SRM=0
UTC=0

if [ -f /etc/sysconfig/clock ]; then
   . /etc/sysconfig/clock

   # convert old style clock config to new values
   if [ "${CLOCKMODE}" = "GMT" ]; then
      UTC=true
   elif [ "${CLOCKMODE}" = "ARC" ]; then
      ARC=true
   fi
fi

CLOCKDEF=""
CLOCKFLAGS="$CLOCKFLAGS --systohc"

case "$UTC" in
   yes|true)
	CLOCKFLAGS="$CLOCKFLAGS -u";
	CLOCKDEF="$CLOCKDEF (utc)";
	;;
   no|false)
	CLOCKFLAGS="$CLOCKFLAGS --localtime";
	CLOCKDEF="$CLOCKDEF (localtime)";
	;;
esac

case "$ARC" in
   yes|true)
	CLOCKFLAGS="$CLOCKFLAGS -A";
	CLOCKDEF="$CLOCKDEF (arc)";
	;;
esac
case "$SRM" in
   yes|true)
	CLOCKFLAGS="$CLOCKFLAGS -S";
	CLOCKDEF="$CLOCKDEF (srm)";
	;;
esac

runcmd $"Syncing hardware clock to system time" /sbin/hwclock $CLOCKFLAGS

# Turn off swap, then unmount file systems.
[ -f /proc/swaps ] && SWAPS=`awk '! /^Filename/ { print $1 }' /proc/swaps`
[ -n "$SWAPS" ] && runcmd $"Turning off swap: " swapoff $SWAPS

[ -x /sbin/quotaoff ] && runcmd $"Turning off quotas: " /sbin/quotaoff -aug

# Unmount file systems, killing processes if we have to.
# Unmount loopback stuff first
remaining=`awk '!/^#/ && $1 ~ /^\/dev\/loop/ && $2 != "/" {print $2}' /proc/mounts`
devremaining=`awk '!/^#/ && $1 ~ /^\/dev\/loop/ && $2 != "/" {print $1}' /proc/mounts`
[ -n "$remaining" ] && {
	sig=
	retry=3
	while [ -n "$remaining" -a "$retry" -gt 0 ]
	do
		if [ "$retry" -lt 3 ]; then
			runcmd $"Unmounting loopback filesystems (retry):" umount $remaining
		else
			runcmd $"Unmounting loopback filesystems: " umount $remaining
		fi
		for dev in $devremaining ; do
			losetup $dev > /dev/null 2>&1 && \
				runcmd $"Detaching loopback device $dev: " losetup -d $dev
		done
		remaining=`awk '!/^#/ && $1 ~ /^\/dev\/loop/ && $2 != "/" {print $2}' /proc/mounts`
		devremaining=`awk '!/^#/ && $1 ~ /^\/dev\/loop/ && $2 != "/" {print $1}' /proc/mounts`
		[ -z "$remaining" ] && break
		/sbin/fuser -k -m $sig $remaining >/dev/null
		sleep 5
		retry=$(($retry -1))
		sig=-9
	done
}

# Unmount RPC pipe file systems
sig=
retry=3
remaining=`awk '!/^#/ && $3 ~ /^rpc_pipefs$/ || $3 ~ /^rpc_svc_gss_pipefs$/ {print $2}' /proc/mounts`

while [ -n "$remaining" -a "$retry" -gt 0 ]
do
	if [ "$retry" -lt 3 ]; then
		runcmd $"Unmounting pipe file systems (retry): "  umount -f $remaining
	else
		runcmd $"Unmounting pipe file systems: "  umount -f $remaining
	fi
	sleep 2
	remaining=`awk '!/^#/ && $3 ~ /^rpc_pipefs$/ || $3 ~ /^rpc_svc_gss_pipefs$/ {print $2}' /proc/mounts`
	[ -z "$remaining" ] && break
	/sbin/fuser -k -m $sig $remaining >/dev/null
	sleep 5
	retry=$(($retry-1))
	sig=-9
done

sig=
retry=3
remaining=`halt_get_remaining | sort -r`

while [ -n "$remaining" -a "$retry" -gt 0 ]
do
	if [ "$retry" -lt 3 ]; then
		LANG=C runcmd $"Unmounting file systems (retry): "  umount -f $remaining
	else
		LANG=C runcmd $"Unmounting file systems: "  umount -f $remaining
	fi
	sleep 2
	remaining=`halt_get_remaining | sort -r`
	[ -z "$remaining" ] && break
	/sbin/fuser -k -m $sig $remaining >/dev/null
	sleep 5
	retry=$(($retry-1))
	sig=-9
done
[ -f /proc/bus/usb/devices ] && umount /proc/bus/usb

# remove the crash indicator flag
rm -f /.autofsck

# Try all file systems other than root and RAM disks, one last time.
mount |  awk '!/( \/ |^\/dev\/root|^\/dev\/ram| \/proc )/ { print $3 }' | \
  while read line; do
    umount -f $line
done

# Remount read only anything that's left mounted.
# echo $"Remounting remaining filesystems readonly"
mount | awk '{ print $3 }' | while read line; do
    mount -n -o ro,remount $line
done

# Now halt or reboot.
echo $"$message"
if [ -f /fastboot ]; then
 echo $"On the next boot fsck will be skipped."
elif [ -f /forcefsck ]; then
 echo $"On the next boot fsck will be forced."
fi

if [ "$command" = /sbin/halt -a -r /etc/ups/upsmon.conf -a -f /etc/killpower -a -f /etc/sysconfig/ups ] ; then
	. /etc/sysconfig/ups
	if [ "$SERVER" = "yes" -a "$MODEL" = "upsdrvctl" ] ; then
		/sbin/upsdrvctl shutdown
	elif [ "$SERVER" = "yes" -a "$MODEL" != "NONE" -a -n "$MODEL" -a -n "$DEVICE" ] ; then
		$MODEL $OPTIONS_HALT -k $DEVICE
	fi
fi

if [ -x /sbin/halt.local ]; then
   /sbin/halt.local
fi

HALTARGS="-i -d"
[ -f /poweroff -o ! -f /halt ] && HALTARGS="$HALTARGS -p"

exec $command $HALTARGS
