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#!/bin/bash
# hwclockfirst.sh Set system clock to hardware clock, according to the UTC
# setting in /etc/default/rcS (see also rcS(5)).
#
#
# WARNING: Runs without write permission on /etc, and before
# mounting all filesystems! If you need write permission
# to do something, do it in hwclock.sh.
#
# 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.
#
# REMEMBER TO EDIT hwclock.sh AS WELL!
# Set this to any options you might need to give to hwclock, such
# as machine hardware clock type for Alphas.
HWCLOCKPARS=
[ ! -x /sbin/hwclock ] && exit 0
. /etc/default/rcS
# Define TZ to the desired timezone here if you need it.
# see tzset(3) for how to define TZ.
# WARNING: TZ takes precedence over /etc/localtime !
TZ=
case "$UTC" in
no|"") GMT="--localtime"
UTC=""
if [ ! -r /etc/localtime ]
then
if [ -z "$TZ" ]
then
echo "$0: System clock was not updated at this time." >&2
exit 1
fi
fi
;;
yes) GMT="--utc"
UTC="--utc"
;;
*) echo "$0: Unknown UTC setting: \"$UTC\"" >&2
exit 1
;;
esac
case "$1" in
start)
# Copies Hardware Clock time to System Clock using the correct
# timezone for hardware clocks in local time, and sets kernel
# timezone. DO NOT REMOVE.
if [ "$HWCLOCKACCESS" != no ]
then
/sbin/hwclock --hctosys $GMT $BADYEAR
fi
if [ "$VERBOSE" != no ]
then
echo "System time was `date --utc`."
echo "Setting the System Clock using the Hardware Clock as reference..."
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 [ -z "$TZ" ]
then
/sbin/hwclock --noadjfile --hctosys $GMT $HWCLOCKPARS
else
TZ="$TZ" /sbin/hwclock --noadjfile --hctosys $GMT $HWCLOCKPARS
fi
if /sbin/hwclock --show $GMT $HWCLOCKPARS 2>&1 > /dev/null | grep -q '^The Hardware Clock registers contain values that are either invalid'; then
echo "Invalid system date -- setting to 1/1/2002"
/sbin/hwclock --set --date '1/1/2002 00:00:00' $GMT $HWCLOCKPARS
fi
if [ "$VERBOSE" != no ]
then
echo "System Clock set. System local time is now `date $UTC`."
fi
;;
stop|restart|reload|force-reload)
# Does nothing
exit 0
;;
*)
echo "Usage: hwclockfirst.sh {start|stop|reload|restart}" >&2
echo " start sets kernel (system) clock from hardware (RTC) clock" >&2
echo " stop, restart, reload and force-reload do nothing." >&2
echo " Refer to hwclock.sh as well." >&2
exit 1
;;
esac
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