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