#!/sbin/openrc-run
# Copyright (c) 2007-2015 The OpenRC Authors.
# See the Authors file at the top-level directory of this distribution and
# https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
#
# This file is part of OpenRC. It is subject to the license terms in
# the LICENSE file found in the top-level directory of this
# distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
# This file may not be copied, modified, propagated, or distributed
# except according to the terms contained in the LICENSE file.

extra_commands="save show"

description="Sets the local clock to UTC or Local Time."
description_save="Saves the current time in the BIOS."
description_show="Displays the current time in the BIOS."

: ${clock_adjfile:=${CLOCK_ADJFILE}}
: ${clock_args:=${CLOCK_OPTS}}
: ${clock_systohc:=${CLOCK_SYSTOHC}}
: ${clock:=${CLOCK:-UTC}}
if [ "$clock" = "UTC" ]; then
	utc="UTC"
	utc_cmd="--utc"
else
	utc="Local Time"
	utc_cmd="--localtime"
fi

depend()
{
	provide clock
	want modules
	if yesno $clock_adjfile; then
		use root
	fi
	keyword -docker -lxc -openvz -prefix -systemd-nspawn -uml -vserver -xenu
}

setupopts()
{
	case "$(uname -m)" in
		s390*)
			utc="s390"
			;;
		*)
			if [ -e /proc/devices ] && \
				grep -q " cobd$" /proc/devices
			then
				utc="coLinux"
			fi
			;;
	esac

	case "$utc" in
		UTC|Local" "Time);;
		*) unset utc_cmd;;
	esac
}

# hwclock doesn't always return non zero on error
_hwclock()
{
	local err="$(hwclock "$@" 2>&1 >/dev/null)"

	[ -z "$err" ] && return 0
	echo "${err}" >&2
	return 1
}

get_noadjfile()
{
	if ! yesno $clock_adjfile; then
		# Some implementations don't handle adjustments
		if LC_ALL=C hwclock --help 2>&1 | grep -q -e "--noadjfile"; then
			echo --noadjfile
		fi
	fi
}

rtc_exists()
{
	local rtc=
	for rtc in /dev/rtc /dev/rtc[0-9]*; do
		[ -e "$rtc" ] && break
	done
	[ -e "$rtc" ]
}

start()
{
	local retval=0 errstr="" modname
	setupopts

	if [ -z "$utc_cmd" ]; then
		ewarn "Not setting clock for $utc system"
		return 0
	fi

	ebegin "Setting system clock using the hardware clock [$utc]"
	if [ -e /proc/modules ]; then
		if ! rtc_exists; then
			for x in rtc-cmos rtc genrtc; do
				modprobe -q $x && rtc_exists && modname="$x" && break
			done
			[ -n "$modname" ] &&
				ewarn "The $modname module needs to be configured in" \
					"${RC_SERVICE%/*/*}/conf.d/modules or built in."
		fi
	fi

	# Always set the kernel's time zone.
	_hwclock --systz $utc_cmd $(get_noadjfile) $clock_args
	: $(( retval += $? ))

	if [ -e /etc/adjtime ] && yesno $clock_adjfile; then
		_hwclock --adjust $utc_cmd $(get_noadjfile)
		: $(( retval += $? ))
	fi

	if yesno ${clock_hctosys:-YES}; then
		_hwclock --hctosys $utc_cmd $(get_noadjfile) $clock_args
		: $(( retval += $? ))
	fi

	eend $retval "Failed to set the system clock"

	return 0
}

stop()
{
	# Don't tweak the hardware clock on LiveCD halt.
	[ -n "$CDBOOT" ] && return 0
	yesno ${clock_systohc:-YES} || return 0

	local retval=0 errstr=""
	setupopts

	[ -z "$utc_cmd" ] && return 0

	ebegin "Setting hardware clock using the system clock" "[$utc]"

	_hwclock --systohc $utc_cmd $(get_noadjfile) $clock_args
	retval=$?

	eend $retval "Failed to sync clocks"
}

save()
{
	clock_systohc=yes
	stop
}

show()
{
	setupopts
	hwclock --show "$utc_cmd" $(get_noadjfile) $clock_args
}