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#!/bin/sh
# hwclock.sh Set system clock to hardware clock, according to the UTC
# setting in /etc/default/rcS (see also rcS(5)).
#
# WARNING: If your hardware clock is not in UTC/GMT, this script
# must know the local time zone. This information is
# stored in /etc/localtime. This might be a problem if
# your /etc/localtime is a symlink to something in
# /usr/share/zoneinfo AND /usr isn't in the root
# partition! The workaround is to define TZ either
# in /etc/default/rcS, or in the proper place below.
[ ! -x /sbin/hwclock ] && exit 0
. /etc/default/rcS
[ "$UTC" = yes ] && UTC=--utc || UTC=--localtime
case "$1" in
start)
if [ "$VERBOSE" != no ]
then
echo "System time was `date`."
echo "Setting the System Clock using the Hardware Clock as reference..."
fi
if [ "$HWCLOCKACCESS" != no ]
then
if [ -z "$TZ" ]
then
hwclock --hctosys $UTC
else
TZ="$TZ" hwclock --hctosys $UTC
fi
fi
if [ "$VERBOSE" != no ]
then
echo "System Clock set. System local time is now `date`."
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 [ "$VERBOSE" != no ]
then
echo "Saving the System Clock time to the Hardware Clock..."
fi
if [ "$HWCLOCKACCESS" != no ]
then
hwclock --systohc $UTC
fi
if [ "$VERBOSE" != no ]
then
echo "Hardware Clock updated to `date`."
fi
exit 0
;;
show)
if [ "$HWCLOCKACCESS" != no ]
then
hwclock --show $UTC
fi
;;
*)
echo "Usage: hwclock.sh {start|stop|show|reload|restart}" >&2
echo " start sets kernel (system) clock from hardware (RTC) clock" >&2
echo " stop and reload set hardware (RTC) clock from kernel (system) clock" >&2
exit 1
;;
esac
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