chromeos_shutdown

#!/bin/sh

# Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Shutdown is best-effort. We don't want to die on errors.
set +e

# Measure shutdown time. /var/log/metrics is created by chromeos_startup.
cut -f 1 -d ' ' /proc/uptime > /var/log/metrics/uptime_shutdown_start
cat /sys/block/sda/stat > /var/log/metrics/disk_shutdown_start

# Sync the system clock to the hardware clock.
HWCLOCK=/sbin/hwclock
${HWCLOCK} --systohc --utc --noadjfile &

. /sbin/killers

# Remount root in case a developer has remounted it rw for some reason.
mount -n -o remount,ro /

# TODO: swapoff as necessary.

# Kill any that may prevent us from unmounting the stateful partition
# or the crypto-home and then unmount. These should be all that we need
# to unmount for a clean shutdown.
kill_with_open_files_on /mnt/stateful_partition /home/chronos

# Unmount our stateful mount points. If any of these fail we do a best-effort
# attempt to touch a /var/log file for future inspection.
/usr/sbin/cryptohome --action=unmount
if [ $? -ne 0 ] ; then
  mount > /var/log/shutdown_cryptohome_umount_failure
fi

# join hwclock setting, already in progress.  If the job has already been
# finished and reaped, we need to suppress error output.  It seems that anything
# on stderr will make the shutdown appear "unclean" from the POV of upstart.
(fg ${HWCLOCK} || /bin/true) 2> /dev/null

# Measure shutdown time
cut -f 1 -d ' ' /proc/uptime > /var/log/metrics/uptime_shutdown_stop
cat /sys/block/sda/stat > /var/log/metrics/disk_shutdown_stop

# Signal that the clean shutdown point was reached (or at least as
# close to that point as we can be before stateful is unmounted).
/sbin/crash_reporter --clean_shutdown

# Lazy umount the tmpfs dirs under /var so we can immediately umount it.
umount -n -l /var/tmp /var/run /var/lock
umount -n /var /usr/local /home /mnt/stateful_partition
if [ $? -ne 0 ] ; then
  mount > /mnt/stateful_partition/var/log/shutdown_stateful_umount_failure
  mount > /var/log/shutdown_stateful_umount_failure
fi

# Just in case something didn't unmount properly above.
sync

# Ensure that we always claim success.
exit 0