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#!/bin/bash
# written by Tobias Powalowski <tpowa@archlinux.org>

ANSWER="/tmp/.tz"
PATH=$PATH:/tmp/bin:/tmp/usr/bin:/tmp/sbin:/tmp/usr/sbin
TITLE="Arch Linux Time Setting"
BASEDIR="/usr/share/zoneinfo"

abort()
{
	dodialog yesno "Abort Time Setting?" 6 40 || return 0
	[ -e /tmp/.timezone ] && rm -f /tmp/.timezone
	[ -e /tmp/.hardwareclock ] && rm -f /tmp/.hardwareclock
	[ -e /tmp/.tz ] && rm -f /tmp/.tz
	[ -e /etc/localtime ] && rm -f /etc/localtime
	[ -e /var/lib/hwclock/adjtime ] && rm -f /var/lib/hwclock/adjtime
	exit 0
}

dodialog()
{
	# use this for msgbox, inputbox, yesno, infobox
	#
	# dodialog <boxtype> <text> [height] [width] [other]
	# 26/3/06: added an option so that if [other] is default=no 
	#	   the dialog will default to no
	# the new dialog's auto-sizing is pretty dumb, we can't trust it
	height=12
	width=65
	if [ "$3" != "" ]; then
		height=$3
	fi
	if [ "$4" != "" ]; then
		width=$4
	fi
	if [ "$5" == "default=no"  ]; then
		dialog --defaultno --backtitle "$TITLE" --aspect 15 --$1 "$2" $height $width 
		
	else
		dialog --backtitle "$TITLE" --aspect 15 --$1 "$2" $height $width $5
	fi
}

domenu()
{
	menutype=$1 ; shift
	text=$1     ; shift
	height=$1   ; shift
	width=$1    ; shift
	mheight=$1  ; shift
	
	dialog --cancel-label "Skip" --$menutype "$text" $height $width $mheight $*
}

dohwclock() {
if [ "$HARDWARECLOCK" = "UTC" ]; then
	HWCLOCK_PARAMS="$HWCLOCK_PARAMS --utc"
	echo UTC > /tmp/.hardwareclock
else
	HWCLOCK_PARAMS="$HWCLOCK_PARAMS --localtime"
	echo localtime > /tmp/.hardwareclock
fi
if [ "$USEDIRECTISA" != "no" ]; then
	HWCLOCK_PARAMS="$HWCLOCK_PARAMS --directisa"
fi
[ ! -d /var/lib/hwclock ] && mkdir -p /var/lib/hwclock
if [ ! -f /var/lib/hwclock/adjtime ]; then
	echo "0.0 0 0.0" > /var/lib/hwclock/adjtime
fi
hwclock $HWCLOCK_PARAMS
}

dotimezone () {
REGIONS=""
SET_REGION=""
SET_ZONE=""
for i in $(grep ^[A-Z] $BASEDIR/zone.tab | cut -f 3 | sed -e 's#/.*##g'| sort -u); do
	REGIONS="$REGIONS $i -"
done
domenu menu "Please Select A Region:" 22 60 16 $REGIONS 2>$ANSWER && SET_REGION="1"
region=$(cat $ANSWER)
if [ "${SET_REGION}" = "1" ]; then
	for i in $(grep ^[A-Z] $BASEDIR/zone.tab | grep $region/ | cut -f 3 | sed -e "s#$region/##g"| sort -u); do
		ZONES="$ZONES $i -"
	done
	domenu menu "Please Select A Timezone:" 22 60 16 $ZONES 2>$ANSWER && SET_ZONE="1"
	zone=$(cat $ANSWER)
	if [ "${SET_ZONE}" = "1" ]; then
		dodialog infobox "Setting Timezone to $region/$zone ..."
		echo $region/$zone > /tmp/.timezone
		[ -e /etc/localtime ] && rm -f /etc/localtime
		cp $BASEDIR/$region/$zone /etc/localtime
		dohwclock
	else
		dodialog msgbox "Skipping Region and Timezone, else please select a Timezone!"
	fi
else
	dodialog msgbox "Skipping Region and Timezone, else please select correct Region first!"
fi
S_NEXTITEM="2"
}

dotimeset() {
USE_UTC=""
SET_TIME=""
USE_NTPDATE=""
### check disabled for now!
#if [ ! -s /tmp/.timezone ]; then
#	dodialog msgbox "You have not selected a region and timezone,\nplease select one!"
#	S_NEXTITEM="1"
#	return 1
#fi
dodialog yesno "Do you want to use UTC for your clock?\n\nIf you choose 'YES' UTC (recommended default) is used,\nwhich ensures daylightsaving is set automatically.\n\nIf you choose 'NO' Localtime is used,\nwhich means the system will not change the time.\nLocaltime is also prefered on dualboot machines,\nwhich also run Windows, because UTC confuses it." 15 65 && HARDWARECLOCK="UTC"
dodialog infobox "Syncing hardwareclock to systemclock ..." 
HWCLOCK_PARAMS="--hctosys"
dodialog yesno "Your current time is:\n$(date)\n\nDo you want to change it?" "" "" && SET_TIME="1"
if [ "${SET_TIME}" = "1" ]; then
	[ $(which ntpdate) ] &&  dodialog yesno "'ntpdate' was detected on your system.\n\nDo you want to use 'ntpdate' for syncing your clock,\nby using the internet clock pool?\n(You need a working internet connection for doing this!)" "" "" default=no && USE_NTPDATE="1"
	if [ "${USE_NTPDATE}" = "1" ]; then
		if [ ! $(ntpdate pool.ntp.org) ]; then 
			dodialog msgbox "An error has occured, time was not changed!"
			S_NEXTITEM="2" 
			return 1
		fi
		dodialog msgbox "Synced clock with internet pool successfully.\n\nYour current time is now:\n$(date)"
	else
	dodialog inputbox "Your current time is:\n$(date)\n\nSyntax of your current time is:\n$(date +%m%d%H%M%y)\nMMDDhhmmYY\n\nPlease enter your correct time below,\naccording to the syntax.\n " 17 60 "" 2>$ANSWER || return 1
		if [ ! $(cat $ANSWER) = "" ]; then
			if [ ! $(date $(cat $ANSWER)) ]; then
				dodialog msgbox "An error occured during time setting,\ncurrent time was not changed!"
				S_NEXTITEM="2"
				return 1
			fi
		else
			dodialog msgbox "You entered nothing, current time was not changed!"
			S_NEXTITEM="2"
			return 1
		fi
		dodialog infobox "Syncing systemclock to hardwareclock ..." 
		HWCLOCK_PARAMS="--systohc"
		dohwclock
		dodialog msgbox "Your current time is now:\n$(date)"
	fi
else
	dodialog msgbox "Current time was not changed!"
fi
S_NEXTITEM="3"
}

mainmenu() {
	if [ -n "$S_NEXTITEM" ]; then
		DEFAULT="--default-item $S_NEXTITEM"
	else
		DEFAULT=""
	fi
	dialog $DEFAULT --backtitle "$TITLE" --title " MAIN MENU " \
		--menu "Use the UP and DOWN arrows to navigate menus. Use TAB to switch between buttons and ENTER to select." 15 55 8 \
		"1" "Select Region and Timezone" \
		"2" "Set Date and Time" \
		"3" "Exit Time Setting" 2>$ANSWER
	case $(cat $ANSWER) in
		"1")
			dotimezone
			;;
		"2")
			dotimeset
			;;
		"3")
			exit 0 ;;
		*)
			abort ;;
	esac
}

loop() {
	while $(/bin/true); do
		mainmenu
	done
}

: >/tmp/.hardwareclock
: >/tmp/.timezone

if [ ! -d $BASEDIR ]; then
	echo "Cannot load timezone data, as none were found in $BASEDIR" >&2
	exit 1
fi

if [ ! $(which hwclock) ]; then
	echo "'hwclock' binary not found!" >&2
	exit 1
fi


if [ ! $(which date) ]; then
	echo "'date' binary not found!" >&2
	exit 1
fi

loop

clear
exit 0