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