#!/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

UMOUNT="umount"
[ ! -w /etc ] && UMOUNT="umount -n"

halt_crypto() {
    fnval=0
    while read dst src key; do
	[ -z "$dst" -o "${dst#\#}" != "$dst" ] && continue
        if [ -b "/dev/mapper/$dst" ]; then
            if /sbin/dmsetup info "$dst" | grep -q '^Open count: *0$'; then
                action $"Stopping disk encryption for $dst" /sbin/cryptsetup remove "$dst"
            else
                fnval=1
            fi
        fi
    done < /etc/crypttab
    return $fnval
}

kill_all() {
    local STRING rc

    STRING=$1
    echo -n "$STRING "
    shift
    /sbin/killall5 "$@"
    rc=$?
    # Retval: 0: success 1: error 2: no processes found to kill
    if [ "$rc" == 1 ]; then
        failure $"$STRING"
    else
        success $"$STRING"
    fi
    echo
    return $rc
}

# 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"
	kexec_command="/sbin/kexec"
	;;
   *)
	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

# Find mdmon pid's and omit killing them
OMITARGS=
for i in /dev/md/*.pid; do
    if [ ! -r "$i" ]; then
        continue
    fi
    OMITARGS="$OMITARGS -o $(cat $i)"
done

kill_all $"Sending all processes the TERM signal..." -15 $OMITARGS
# No need to sleep and kill -9 if no processes to kill were found
if [ "$?" == 0 ]; then
    sleep 2
    kill_all $"Sending all processes the KILL signal..." -9 $OMITARGS
fi

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

# Save mixer settings, here for lack of a better place.
if [ -s /etc/alsa/alsactl.conf ] && [ -x /sbin/alsactl ] && [ -w /etc/asound.state ]; then
  action $"Saving mixer settings" /sbin/alsactl -E ALSA_CONFIG_PATH=/etc/alsa/alsactl.conf --ignore store
fi

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

[ -x /sbin/hwclock ] && action $"Syncing hardware clock to system time" /sbin/hwclock --systohc

# Try to unmount tmpfs filesystems to avoid swapping them in.  Ignore failures.
tmpfs=$(awk '$2 ~ /^\/($|proc|dev)/ { next; }
	     $3 == "tmpfs" { print $2; }' /proc/mounts | sort -r)
[ -n "$tmpfs" ] && fstab-decode $UMOUNT $tmpfs 2>/dev/null

# Turn off swap, then unmount file systems.
[ -f /proc/swaps ] && SWAPS=$(awk '! /^Filename/ { print $1 }' /proc/swaps)
if [ -n "$SWAPS" ]; then
    action $"Turning off swap: " swapoff $SWAPS
    for dst in $SWAPS; do
	if [[ "$dst" == /dev/mapper* ]] \
	    && [ "$(dmsetup status "$dst" | cut -d ' ' -f 3)" = crypt ]; then
	    backdev=$(/sbin/cryptsetup status "$dst" \
		| awk '$1 == "device:" { print $2 }')
	    /sbin/cryptsetup remove "$dst"
	fi
    done
fi

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

# Unmount file systems, killing processes if we have to.
# Unmount loopback stuff first
__umount_loopback_loop

# Unmount RPC pipe file systems
__umount_loop '$3 ~ /^rpc_pipefs$/ || $3 ~ /^rpc_svc_gss_pipefs$/ {print $2}' \
    /proc/mounts \
    $"Unmounting pipe file systems: " \
    $"Unmounting pipe file systems (retry): " \
    -f

LANG=C __umount_loop '$2 ~ /^\/$|^\/proc|^\/cgroup|^\/sys\/fs\/cgroup|^\/dev/{next}
	$3 == "tmpfs" || $3 == "proc" {print $2 ; next}
	$3 ~ /(loopfs|autofs|nfs|cifs|smbfs|ncpfs|sysfs)/ {next}
	/(^none|^\/dev\/ram|^\/dev\/root$)/ {next}
	{print $2}' /proc/mounts \
	$"Unmounting file systems: " \
	$"Unmounting file systems (retry): " \
	-f

[ -f /proc/bus/usb/devices ] && $UMOUNT /proc/bus/usb

[ -f /etc/crypttab ] && halt_crypto

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

# Try all file systems other than root, essential filesystems and RAM disks,
# one last time.
awk '$2 !~ /\/(|dev|proc|selinux|cgroup|sys)$/ && $1 !~ /(^\/dev\/ram|cgroup)/ { print $2 }' \
    /proc/mounts | sort -r | \
  while read line; do
    fstab-decode $UMOUNT -f $line
done

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

# Tell init to re-exec itself.
kill -TERM 1

# Remount read only anything that's left mounted.
# echo $"Remounting remaining filesystems readonly"
mount | awk '{ print $1,$3 }' | while read dev dir; do
    fstab-decode mount -n -o ro,remount $dev $dir
done

# If we left mdmon's running wait for the raidsets to become clean
if [ -n "$OMITARGS" ]; then
    mdadm --wait-clean --scan
fi

# 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

# Shutdown UPS drivers
if [ "$command" = /sbin/halt ] && [ -f /etc/sysconfig/ups ]; then
	. /etc/sysconfig/ups
	if [ -z $POWERDOWNFLAG ]; then
		POWERDOWNFLAG=/etc/killpower
	fi
	if [ "$SERVER" = "yes" ] && [ -f $POWERDOWNFLAG ]; then
		/sbin/upsdrvctl shutdown
	fi
fi

# First, try kexec. If that fails, fall back to rebooting the old way.
[ -n "$kexec_command" ] && $kexec_command -e -x >& /dev/null

HALTARGS="-d"
[ "$INIT_HALT" != "HALT" ] && HALTARGS="$HALTARGS -p"

exec $command $HALTARGS