slackware-current/source/a/sysvinit-scripts/scripts/rc.6

#!/bin/bash
#
# rc.6		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.
#
# Version:	@(#)/etc/rc.d/rc.6	15.0 Wed Nov 10 21:19:42 UTC 2021
#
# Author:	Miquel van Smoorenburg <miquels@drinkel.nl.mugnet.org>
# Modified by:  Patrick J. Volkerding, <volkerdi@slackware.com>

# Set the path.
PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin

# If we are in an lxc container, set $container to skip parts of the script.
# Thanks to Matteo Bernardini <ponce@slackbuilds.org> and Chris Willing for
# the initial work making this script lxc compatible.
if grep -aq container=lxc /proc/1/environ 2> /dev/null ; then
  container="lxc"
fi

# If there are SystemV init scripts for this runlevel, run them.
if [ -x /etc/rc.d/rc.sysvinit ]; then
  /etc/rc.d/rc.sysvinit
fi

# Set linefeed mode to avoid staircase effect.
/bin/stty onlcr

echo "Running shutdown script $0:"

# Find out how we were called.
case "$0" in
	*0)
		shutdown_command="halt"
		;;
	*6)
		shutdown_command=reboot
		;;
	*)
		echo "$0: call me as \"rc.0\" or \"rc.6\" please!"
		exit 1
		;;
esac

# Restart init. This prevents init from hanging on to file handles for removed
# glibc shared libraries in the case that those were upgraded or reinstalled.
/sbin/telinit u

# Save the system time to the hardware clock using hwclock --systohc.
# This will also create or update the timestamps in /etc/adjtime.
if [ -x /sbin/hwclock -a -z "$container" ]; then
  # Check for a broken motherboard RTC clock (where ioports for rtc are
  # unknown) to prevent hwclock causing a hang:
  if ! grep -q " : rtc" /proc/ioports ; then
    CLOCK_OPT="--directisa"
  fi
  if [ /etc/adjtime -nt /etc/hardwareclock ]; then
    if grep -q "^LOCAL" /etc/adjtime ; then
      echo "Saving system time to the hardware clock (localtime)."
    else
      echo "Saving system time to the hardware clock (UTC)."
    fi
    /sbin/hwclock $CLOCK_OPT --systohc
  elif grep -q "^UTC" /etc/hardwareclock 2> /dev/null ; then
    echo "Saving system time to the hardware clock (UTC)."
    if [ ! -r /etc/adjtime ]; then
      echo "Creating system time correction file /etc/adjtime."
    fi
    /sbin/hwclock $CLOCK_OPT --utc --systohc
  else
    echo "Saving system time to the hardware clock (localtime)."
    if [ ! -r /etc/adjtime ]; then
      echo "Creating system time correction file /etc/adjtime."
    fi
    /sbin/hwclock $CLOCK_OPT --localtime --systohc
  fi
fi

# Run any local shutdown scripts:
if [ -x /etc/rc.d/rc.local_shutdown ]; then
  /etc/rc.d/rc.local_shutdown stop
fi

# Stop the Apache web server:
if [ -x /etc/rc.d/rc.httpd ]; then
  /etc/rc.d/rc.httpd stop
fi

# Stop the MySQL database:
if [ -x /etc/rc.d/rc.mysqld -a -r /var/run/mysql/mysql.pid ]; then
  /etc/rc.d/rc.mysqld stop
fi

# Stop the Samba server:
if [ -x /etc/rc.d/rc.samba ]; then
  /etc/rc.d/rc.samba stop
fi

# Shut down the NFS server:
if [ -x /etc/rc.d/rc.nfsd ]; then
  /etc/rc.d/rc.nfsd stop
fi

# Shut down the SSH server:
if [ -x /etc/rc.d/rc.sshd ]; then
  /etc/rc.d/rc.sshd stop
fi

# Shut down the SASL authentication daemon:
if [ -x /etc/rc.d/rc.saslauthd ]; then
  /etc/rc.d/rc.saslauthd stop
fi

# Shut down OpenLDAP:
if [ -x /etc/rc.d/rc.openldap ]; then
  /etc/rc.d/rc.openldap stop
fi

# Stop the haveged entropy daemon:
if [ -x /etc/rc.d/rc.haveged -a -z "$container" ]; then
  /etc/rc.d/rc.haveged stop
fi

# Kill any processes (typically gam) that would otherwise prevent
# unmounting NFS volumes:
unset FUSER_DELAY
for dir in $(/bin/mount | grep -e 'type nfs ' -e 'type nfs4 ' | sed -e 's|.* on ||g' | cut -d ' ' -f 1) ; do
  echo "Killing processes holding NFS mount $dir open..."
  # Background this to prevent fuser from also blocking shutdown:
  /usr/bin/fuser -k -M -m "$dir" &
  FUSER_DELAY=5
done
# If fuser was run, let it have some delay:
if [ ! -z "$FUSER_DELAY" ]; then
  sleep $FUSER_DELAY
fi

# Unmount any NFS, SMB, or CIFS filesystems:
echo "Unmounting remote filesystems:"
/bin/umount -v -a -l -f -r -t nfs,nfs4,smbfs,cifs | tr -d ' ' | grep successfully | sed "s/:successfullyunmounted/ has been successfully unmounted./g"

# Stop D-Bus:
if [ -x /etc/rc.d/rc.messagebus ]; then
  /etc/rc.d/rc.messagebus stop
fi

# Try to shut down pppd:
PS="$(ps ax)"
if echo "$PS" | /bin/grep -q -w pppd ; then
  if [ -x /usr/sbin/ppp-off ]; then
    /usr/sbin/ppp-off
  fi
fi

# Shut down YP services:
if [ -x /etc/rc.d/rc.yp ]; then
  if grep -wq stop /etc/rc.d/rc.yp ; then
    /etc/rc.d/rc.yp stop
  fi
fi

# Bring down the networking system, but first make sure that this
# isn't a diskless client with the / partition mounted via NFS:
if ! /bin/mount | /bin/grep -q -e 'on / type nfs' -e 'on / type nfs4' ; then
  if [ -x /etc/rc.d/rc.inet1 ]; then
    /etc/rc.d/rc.inet1 stop
  fi
fi

# In case dhcpcd might have been manually started on the command line,
# look for the .pid file, and shut dhcpcd down if it's found:
if /bin/ls /etc/dhcpc/*.pid 1> /dev/null 2> /dev/null ; then
  /sbin/dhcpcd -k 1> /dev/null 2> /dev/null
  # A little time for /etc/resolv.conf and/or other files to
  # restore themselves.
  sleep 2
fi

# Shut down PCMCIA devices:
if [ -x /etc/rc.d/rc.pcmcia -a -z "$container" ]; then
  /etc/rc.d/rc.pcmcia stop
  # The cards might need a little extra time here to deactivate:
  /bin/sleep 5
fi

# Turn off process accounting:
if [ -x /sbin/accton -a -r /var/log/pacct ]; then
  /sbin/accton off
fi

# Terminate acpid before syslog:
if [ -x /etc/rc.d/rc.acpid -a -r /var/run/acpid.pid -a -z "$container" ]; then # quit
  /etc/rc.d/rc.acpid stop
fi

# Stop udev:
if [ -x /etc/rc.d/rc.udev -a -z "$container" ]; then
  /etc/rc.d/rc.udev force-stop
fi

# Kill all remaining processes.
OMITPIDS="$(for p in $(pgrep mdmon); do echo -o $p; done)" # Don't kill mdmon
if [ ! "$1" = "fast" ]; then
  echo "Sending all processes the SIGTERM signal."
  /sbin/killall5 -15 $OMITPIDS
  /bin/sleep 5
  echo "Sending all processes the SIGKILL signal."
  /sbin/killall5 -9 $OMITPIDS
fi

# Try to turn off quota.
if /bin/grep -q quota /etc/fstab ; then
  if [ -x /sbin/quotaoff -a -z "$container" ]; then
    echo "Turning off filesystem quotas."
    /sbin/quotaoff -a
  fi
fi

# Carry a random seed between reboots.
# Doing this properly requires the seedrng utility.
if [ -z "$container" ]; then
  # Any old seed that exists here shall be deemed useless:
  if [ -f /etc/random-seed ]; then
    rm -f /etc/random-seed
    sync /etc
  fi
  if [ -x /usr/sbin/seedrng ]; then
    /usr/sbin/seedrng
  else # we have to fall back on the old method:
    OLD_UMASK="$(umask)"
    umask 077
    mkdir -p /var/lib/seedrng
    echo "The SeedRNG utility was not found. Generating a non-creditable and"
    echo "inferior RNG seed: /var/lib/seedrng/seed.no-credit"
    SEED="$(cat /var/lib/seedrng/seed.* 2>/dev/null | base64)"
    rm -f /var/lib/seedrng/seed.*
    sync /var/lib/seedrng
    POOLSIZE=$(expr $(cat /proc/sys/kernel/random/poolsize 2> /dev/null || echo 4096) / 8)
    {
      head -c $POOLSIZE /dev/urandom
      echo "$SEED" | base64 -d
    } | sha512sum | cut -d ' ' -f 1 > /var/lib/seedrng/seed.no-credit
    umask "$OLD_UMASK"
    unset OLD_UMASK
    unset SEED
  fi
fi

# Before unmounting file systems write a reboot or halt record to wtmp.
$shutdown_command -w

# Turn off swap:
if [ ! "$(cat /proc/swaps | wc -l)" = "1" -a -z "$container" ]; then
  echo "Turning off swap."
  /sbin/swapoff -a
  /bin/sync
fi

# Umount all tmpfs mounts except /dev/shm and under /run:
if [ -z "$container" ]; then
  cat /proc/mounts | grep " tmpfs " | grep -v -e " /run " -e " /run/" -e " /dev/shm " | while read mount ; do
    umount --recursive -v $(echo $mount | cut -f 2 -d ' ') 2> /dev/null
  done
fi

# Unmount local file systems:
if [ -z "$container" ]; then
  echo "Unmounting local file systems:"
  /bin/umount -v -a -t no,proc,sysfs,devtmpfs,fuse.gvfsd-fuse,tmpfs
  # JFS needs a sync here or the / partition cannot be remounted read-only.
  # In spite of this, it seems that a JFS root partition will always be checked
  # (and found to be clean) at boot:
  /bin/sync
  echo "Remounting root filesystem read-only:"
  /bin/mount -v -n -o remount,ro /
fi

# This never hurts:
/bin/sync

# Close any volumes opened by cryptsetup:
if [ -f /etc/crypttab -a -x /sbin/cryptsetup ]; then
  cat /etc/crypttab | grep -v "^#" | grep -v "^$" | while read line; do
    # NOTE: we only support LUKS formatted volumes (except for swap)!
    LUKS=$(echo $line | tr '\t' ' ' | tr -s ' ' | cut -f1 -d' ')
    DEV=$(echo $line | tr '\t' ' ' | tr -s ' ' | cut -f2 -d' ')
    OPTS=$(echo $line | tr '\t' ' ' | tr -s ' ' | cut -f4 -d' ')
    if /sbin/cryptsetup isLuks $DEV 2>/dev/null ; then
      echo "Locking LUKS crypt volume '${LUKS}':"
      /sbin/cryptsetup luksClose ${LUKS}
    elif echo $OPTS | grep -wq swap ; then
      # If any of the volumes was used as encrypted swap,
      # then run mkswap on the underlying device -
      # in case other Linux installations on this computer should use it:
      echo "Erasing encrypted swap '${LUKS}' and restoring normal swap on ${DEV}:"
      /sbin/cryptsetup remove ${LUKS}
      mkswap $DEV
    fi
  done
fi

# Deactivate LVM volume groups:
if [ -z "$container" ]; then
  if [ -r /etc/lvmtab -o -d /etc/lvm/backup ]; then
    echo "Deactivating LVM volume groups:"
    /sbin/vgchange -an
  fi
fi

# This never hurts again (especially since root-on-LVM always fails
# to deactivate the / logical volume...  but at least it was
# remounted as read-only first)
/bin/sync

# sleep 3 fixes problems with some hard drives that don't
# otherwise finish syncing before reboot or poweroff
/bin/sleep 3

# This is to ensure all processes have completed on SMP machines:
wait

if [ -x /sbin/genpowerd -a -z "$container" ]; then
  # See if this is a powerfail situation:
  if /bin/egrep -q "FAIL|SCRAM" /etc/upsstatus 2> /dev/null ; then
    # Signal UPS to shut off the inverter:
    /sbin/genpowerd -k
    if [ ! $? = 0 ]; then
      echo
      echo "There was an error signaling the UPS."
      echo "Perhaps you need to edit /etc/genpowerd.conf to configure"
      echo "the serial line and UPS type."
      # Wasting 15 seconds of precious power:
      /bin/sleep 15
    fi
  fi
fi

if [ "$container" = "lxc" ]; then
  # Confirm successful shutdown of the container:
  echo "LXC container stopped."
fi

# Now halt (poweroff with APM or ACPI enabled kernels) or reboot.
if [ "$shutdown_command" = "reboot" ]; then
  echo "Rebooting."
  /sbin/reboot
else
  /sbin/poweroff
fi