#!/bin/sh
set -e

. /usr/share/debconf/confmodule

log() {
	logger -t clock-setup "$@"
}
warning() {
	log "warning: $*"
}

os_needs_local_clock () {
	while read line; do
		shortname=$(echo "$line" | cut -d : -f 3)
		case $shortname in
		MS-DOS*|Windows*|FreeDOS*|Solaris*) # keep in sync with os-prober
			return 0
		;;
		esac
	done
	return 1
}

hwclock_prepare () {
	anna-install rtc-modules || true

	# This may not be necessary on all hardware; hwclock can do direct IO
	# if the rtc module is not loaded.
	log-output -t hw-detect modprobe -v rtc || log "rtc module not loaded"
	log-output -t hw-detect modprobe -v rtc-dev || log "rtc-dev module not loaded"
	update-dev --settle

	# bind mount /dev into /target/dev so that rtc devices are
	# available for hwclock
	if mount -o bind /dev /target/dev; then
		target_dev_mounted=1
	else
		warning "failed to bind mount /target/dev"
	fi
}

hwclock_cleanup () {
	if [ "$target_dev_mounted" ] && ! umount /target/dev; then
		warning "failed to unmount /target/dev bind mount"
	fi
}

hwclock_stop () {
	kill $pid || return
	sleep 1
	if [ -e /proc/$pid ]; then
		kill -9 $pid || return
	fi
}

pri=high

if db_fget clock-setup/utc seen && [ "$RET" = true ]; then
	# keep preseeded value
	:
else
	# os-prober may not yet be installed...
	anna-install os-prober-udeb || true

	probed=$(os-prober) || true

	if echo "$probed" | os_needs_local_clock; then
		# default to localtime for some OSes
		db_set clock-setup/utc false
		pri=low
	fi

	if [ -z "$probed" ]; then
		# installing the only OS, so use UTC
		db_set clock-setup/utc true
		db_get clock-setup/utc-auto
		if [ "$RET" = true ]; then
			pri=low
		fi
	fi
fi

db_input $pri clock-setup/utc || true
if ! db_go; then
	exit 10 # back to main menu
fi

# Update target system configuration for utc/localtime selection
rcsfile=/target/etc/default/rcS

db_get clock-setup/utc
if [ "$RET" = true ]; then
	sed -i -e 's:^UTC="no":UTC="yes":' -e 's:^UTC=no:UTC=yes:' $rcsfile
	OPT="--utc"
else
	sed -i -e 's:^UTC="yes":UTC="no":' -e 's:^UTC=yes:UTC=no:' $rcsfile
	OPT="--localtime"
fi

# Only update the hardware clock if the system clock was updated using rdate
db_get clock-setup/system-time-changed
if [ "$RET" = true ]; then
	hwclock_prepare

	db_progress INFO clock-setup/progress/hwclock
	log-output -t clock-setup chroot /target hwclock $OPT --systohc --debug --noadjfile &
	pid="$!"
	count=0

	while sleep 1; do
		if [ ! -e /proc/$pid ]; then
			break
		fi
		count=$(($count + 1))
		if [ $count -eq 30 ]; then
			count=0
			db_input critical clock-setup/hwclock-wait || true
			if ! db_go; then
				hwclock_stop
				cleanup
				exit 10 # back to main menu
			fi
			db_get clock-setup/hwclock-wait
			if [ "$RET" = false ]; then
				hwclock_stop
				break
			fi
		fi
	done

	hwclock_cleanup
else
	log "not setting hardware clock"
fi