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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ case "$1" in
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+ start)
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+ # If the admin deleted the hwclock config, create a blank
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+ # template with the defaults.
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+ if [ -w /etc ] && [ ! -f /etc/adjtime ] && [ ! -e /etc/adjtime ]; then
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+ printf "0.0 0 0.0\n0\nUTC\n" > /etc/adjtime
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+ fi
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+
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+ if [ -d /run/udev ] || [ -d /dev/.udev ]; then
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+ return 0
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+ fi
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+
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+ if [ "$HWCLOCKACCESS" != no ]; then
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+ log_action_msg "Setting the system clock"
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+
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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 $UTC`"
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+ fi
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+ else
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+ verbose_log_action_msg "Not setting System Clock"
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+ fi
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+ ;;
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+ stop|restart|reload|force-reload)
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+ #
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+ # Updates the Hardware Clock with the System Clock time.
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+ # This will *override* any changes made to the Hardware Clock.
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+ #
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+ # WARNING: If you disable this, any changes to the system
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+ # clock will not be carried across reboots.
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+ #
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+
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+ if [ "$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 $BADYEAR
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+ fi
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+ ;;
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+ *)
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+ log_success_msg "Usage: hwclock.sh {start|stop|reload|force-reload|show}"
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+ log_success_msg " start sets kernel (system) clock from hardware (RTC) clock"
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+ log_success_msg " stop and reload set hardware (RTC) clock from kernel (system) clock"
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+ return 1
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+ ;;
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+ esac
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+ }
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+
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+ hwclocksh "$@"