#!/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, <[email protected]>
# 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 -a -x /sbin/alsactl -a -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 -a -e /dev/rtc ] && 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|^\/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 '$2 !~ /\/(|dev|proc|selinux|sys)$/ && $1 !~ /^\/dev\/ram/ { print $2 }' \
/proc/mounts | sort -r | \
while read line; do
fstab-decode $UMOUNT -f $line
done

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

if [ -x /sbin/halt.local ]; then
/sbin/halt.local "$message" "$command" "$HALTARGS" "$kexec_command"
fi

# Tell init to re-exec itself.
kill -TERM 1
# And give init some time to do that (#1259873)
sleep 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 "$OMITARGS" ]; then
sync
HALTARGS="$HALTARGS -n"
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 -a -f /etc/sysconfig/ups ]; then
. /etc/sysconfig/ups
if [ -z $POWERDOWNFLAG ]; then
POWERDOWNFLAG=/etc/killpower
fi
if [ "$SERVER" = "yes" -a -f $POWERDOWNFLAG ]; then
/sbin/upsdrvctl shutdown
sleep 120
/sbin/reboot --force
fi
fi

# Turn off UPS in powerfail situation
if [ -x /etc/apcupsd/apccontrol -a -f /etc/apcupsd/powerfail ]; then
/etc/apcupsd/apccontrol killpower
fi

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


exec $command $HALTARGS