Mac Easy 2010 May/Mac Life Ubuntu.iso/casper/filesystem.squashfs/etc/init.d/hwclock.sh

Linux/UNIX/POSIX Shell Script | 2009-02-18 | 5.1 KB | 172 lines

#!/bin/sh
# hwclock.sh    Set and adjust the CMOS clock, according to the UTC
#        setting in /etc/default/rcS (see also rcS(5)).
#
# Version:    @(#)hwclock.sh  2.00  14-Dec-1998  [e-mail]
#
# Patches:
#        2000-01-30 Henrique M. Holschuh <[e-mail]>
#         - Minor cosmetic changes in an attempt to help new
#           users notice something IS changing their clocks
#           during startup/shutdown.
#         - Added comments to alert users of hwclock issues
#           and discourage tampering without proper doc reading.

# WARNING:    Please read /usr/share/doc/util-linux/README.Debian.hwclock
#        before changing this file. You risk serious clock
#        misbehaviour otherwise.

# In Ubuntu, it is normal that this init script is not run at startup;
# the system clock is set from the hardware clock by the kernel, and
# adjusted if the hardware clock was in localtime by udev.

### BEGIN INIT INFO
# Provides:          hwclock
# Required-Start:    mountdevsubfs
# Required-Stop:     $local_fs
# Default-Start:
# Default-Stop:      0 6
### END INIT INFO

FIRST=no    # debian/rules sets this to 'yes' when creating hwclockfirst.sh

# Set this to any options you might need to give to hwclock, such
# as machine hardware clock type for Alphas.
HWCLOCKPARS=

# Set this to the hardware clock device you want to use, it should
# probably match the CONFIG_RTC_HCTOSYS_DEVICE kernel config option.
HCTOSYS_DEVICE=rtc0

hwclocksh()
{
    [ ! -x /sbin/hwclock ] && return 0
    . /etc/default/rcS

    . /lib/lsb/init-functions
    verbose_log_action_msg() { [ "$VERBOSE" = no ] || log_action_msg "$@"; }

    [ "$GMT" = "-u" ] && UTC="yes"
    case "$UTC" in
       no|"")    GMT="--localtime"
        UTC=""
        if [ "X$FIRST" = "Xyes" ] && [ ! -r /etc/localtime ]; then
            if [ -z "$TZ" ]; then
            log_action_msg "System clock was not updated at this time"
            return 1
            fi
        fi
        ;;
       yes)    GMT="--utc"
        UTC="--utc"
        ;;
       *)    log_action_msg "Unknown UTC setting: \"$UTC\""; return 1 ;;
    esac

    case "$BADYEAR" in
       no|"")    BADYEAR="" ;;
       yes)    BADYEAR="--badyear" ;;
       *)    log_action_msg "unknown BADYEAR setting: \"$BADYEAR\""; return 1 ;;
    esac

    case "$1" in
    start)
        if [ -w /etc ] && [ ! -f /etc/adjtime ] && [ ! -e /etc/adjtime ]; then
        echo "0.0 0 0.0" > /etc/adjtime
        fi

        if [ ! -w /etc/adjtime ]; then
        NOADJ="--noadjfile"
        else
            NOADJ=""
        fi

        if [ "$FIRST" != yes ]; then
        # Uncomment the hwclock --adjust line below if you want
        # hwclock to try to correct systematic drift errors in the
        # Hardware Clock.
        #
        # WARNING: If you uncomment this option, you must either make
        # sure *nothing* changes the Hardware Clock other than
        # hwclock --systohc, or you must delete /etc/adjtime
        # every time someone else modifies the Hardware Clock.
        #
        # Common "vilains" are: ntp, MS Windows, the BIOS Setup
        # program.
        #
        # WARNING: You must remember to invalidate (delete)
        # /etc/adjtime if you ever need to set the system clock
        # to a very different value and hwclock --adjust is being
        # used.
        #
        # Please read /usr/share/doc/util-linux/README.Debian.hwclock
        # before enabling hwclock --adjust.

        #/sbin/hwclock --rtc=/dev/$HCTOSYS_DEVICE --adjust $GMT $BADYEAR
        :
        fi

        if [ "$HWCLOCKACCESS" != no ]; then
        log_action_msg "Setting the system clock"

        # 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 /sbin/hwclock --rtc=/dev/$HCTOSYS_DEVICE --hctosys $GMT $HWCLOCKPARS $BADYEAR $NOADJ; then
            #    Announce the local time.
            verbose_log_action_msg "System Clock set to: `date $UTC`"
        else
            log_warning_msg "Unable to set System Clock to: `date $UTC`"
        fi
        else
        verbose_log_action_msg "Not setting System Clock"
        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 [ ! -w /etc/adjtime ]; then
        NOADJ="--noadjfile"
        else
            NOADJ=""
        fi

        if [ "$HWCLOCKACCESS" != no ]; then
        log_action_msg "Saving the system clock"
        if [ "$GMT" = "-u" ]; then
            GMT="--utc"
        fi
        if /sbin/hwclock --rtc=/dev/$HCTOSYS_DEVICE --systohc $GMT $HWCLOCKPARS $BADYEAR $NOADJ; then
            verbose_log_action_msg "Hardware Clock updated to `date`"
        fi
        else
        verbose_log_action_msg "Not saving System Clock"
        fi
        ;;
    show)
        if [ ! -w /etc/adjtime ]; then
        NOADJ="--noadjfile"
        else
            NOADJ=""
        fi

        if [ "$HWCLOCKACCESS" != no ]; then
        /sbin/hwclock --rtc=/dev/$HCTOSYS_DEVICE --show $GMT $HWCLOCKPARS $BADYEAR $NOADJ
        fi
        ;;
    *)
        log_success_msg "Usage: hwclock.sh {start|stop|reload|force-reload|show}"
        log_success_msg "       start sets kernel (system) clock from hardware (RTC) clock"
        log_success_msg "       stop and reload set hardware (RTC) clock from kernel (system) clock"
        return 1
        ;;
    esac
}

hwclocksh "$@"