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#!/bin/sh
# hwclock.sh Set and adjust the CMOS clock.
#
# Version: @(#)hwclock.sh 2.00 14-Dec-1998 miquels@cistron.nl
#
# Patches:
# 2000-01-30 Henrique M. Holschuh <hmh@rcm.org.br>
# - Minor cosmetic changes in an attempt to help new
# users notice something IS changing their clocks
# during startup/shutdown.
# - Added comments to alert users of hwclock issues
# and discourage tampering without proper doc reading.
# 2012-02-16 Roger Leigh <rleigh@debian.org>
# - Use the UTC/LOCAL setting in /etc/adjtime rather than
# the UTC setting in /etc/default/rcS. Additionally
# source /etc/default/hwclock to permit configuration.
### BEGIN INIT INFO
# Provides: hwclock
# Required-Start: mountdevsubfs
# Required-Stop: mountdevsubfs
# Should-Stop: umountfs
# Default-Start: S
# X-Start-Before: checkroot
# Default-Stop: 0 6
# Short-Description: Sync hardware and system clock time.
### END INIT INFO
# These defaults are user-overridable in /etc/default/hwclock
BADYEAR=no
HWCLOCKACCESS=yes
HWCLOCKPARS=
HCTOSYS_DEVICE=rtc0
# We only want to use the system timezone or else we'll get
# potential inconsistency at startup.
unset TZ
hwclocksh()
{
[ ! -x /sbin/hwclock ] && return 0
[ ! -r /etc/default/rcS ] || . /etc/default/rcS
[ ! -r /etc/default/hwclock ] || . /etc/default/hwclock
. /lib/lsb/init-functions
verbose_log_action_msg() { [ "$VERBOSE" = no ] || log_action_msg "$@"; }
case "$BADYEAR" in
no|"") BADYEAR="" ;;
yes) BADYEAR="--badyear" ;;
*) log_action_msg "unknown BADYEAR setting: \"$BADYEAR\""; return 1 ;;
esac
case "$1" in
start)
# If the admin deleted the hwclock config, create a blank
# template with the defaults.
if [ -w /etc ] && [ ! -f /etc/adjtime ] && [ ! -e /etc/adjtime ]; then
printf "0.0 0 0.0\n0\nUTC\n" > /etc/adjtime
fi
if [ -d /run/udev ] || [ -d /dev/.udev ]; then
return 0
fi
if [ "$HWCLOCKACCESS" != no ]; then
log_action_msg "Setting the system clock"
# Just for reporting.
if sed '3!d' /etc/adjtime | grep -q '^UTC$'; then
UTC="--utc"
else
UTC=
fi
# Copies Hardware Clock time to System Clock using the correct
# timezone for hardware clocks in local time, and sets kernel
# timezone. DO NOT REMOVE.
if /sbin/hwclock --rtc=/dev/$HCTOSYS_DEVICE --hctosys $HWCLOCKPARS $BADYEAR; then
# Announce the local time.
verbose_log_action_msg "System Clock set to: `date $UTC`"
else
log_warning_msg "Unable to set System Clock to: `date $UTC`"
fi
else
verbose_log_action_msg "Not setting System Clock"
fi
;;
stop|restart|reload|force-reload)
#
# Updates the Hardware Clock with the System Clock time.
# This will *override* any changes made to the Hardware Clock.
#
# WARNING: If you disable this, any changes to the system
# clock will not be carried across reboots.
#
if [ "$HWCLOCKACCESS" != no ]; then
log_action_msg "Saving the system clock"
if /sbin/hwclock --rtc=/dev/$HCTOSYS_DEVICE --systohc $HWCLOCKPARS $BADYEAR; then
verbose_log_action_msg "Hardware Clock updated to `date`"
fi
else
verbose_log_action_msg "Not saving System Clock"
fi
;;
show)
if [ "$HWCLOCKACCESS" != no ]; then
/sbin/hwclock --rtc=/dev/$HCTOSYS_DEVICE --show $HWCLOCKPARS $BADYEAR
fi
;;
*)
log_success_msg "Usage: hwclock.sh {start|stop|reload|force-reload|show}"
log_success_msg " start sets kernel (system) clock from hardware (RTC) clock"
log_success_msg " stop and reload set hardware (RTC) clock from kernel (system) clock"
return 1
;;
esac
}
hwclocksh "$@"
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