#!/bin/sh -e
#
# 2020 Dennis Camera (dennis.camera@ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#

# TODO: Consider supporting BADYEAR

os=$(cat "${__global:?}/explorer/os")
mode=$(cat "${__object:?}/parameter/mode")

has_systemd_timedatectl=$(test -s "${__object:?}/explorer/timedatectl_localrtc" && echo true || echo false)


case ${mode}
in
	(localtime)
		local_clock=true
		;;
	(UTC|utc)
		local_clock=false
		;;
	(*)
		printf 'Invalid value for --mode: %s\n' "${mode}" >&2
		printf 'Acceptable values are: UTC, localtime.\n' >&2
		exit 1
esac


case ${os}
in
	(alpine|gentoo)
		if ! $has_systemd_timedatectl
		then
			# NOTE: Gentoo also supports systemd, in which case /etc/conf.d is
			#       not used. So we check for systemd presence here and only
			#       update /etc/conf.d if systemd is not installed.
			# https://wiki.gentoo.org/wiki/System_time#Hardware_clock

			export CDIST_ORDER_DEPENDENCY=true
			__file /etc/conf.d/hwclock --state present \
				--owner root --group root --mode 0644
			__key_value /etc/conf.d/hwclock:clock \
				--file /etc/conf.d/hwclock \
				--key clock \
				--delimiter '=' --exact_delimiter \
				--value "\"$($local_clock && echo local || echo UTC)\""
			unset CDIST_ORDER_DEPENDENCY
		fi
		;;
	(centos|fedora|redhat|scientific)
		os_version=$(cat "${__global:?}/explorer/os_version")
		os_major=$(expr "${os_version}" : '.* release \([0-9]*\)')
		case ${os}
		in
			(centos|scientific)
				update_sysconfig=$(test "${os_major}" -lt 6 && echo true || echo false)
				;;
			(fedora)
				update_sysconfig=$(test "${os_major}" -lt 10 && echo true || echo false)
				;;
			(redhat|*)
				case ${os_version}
				in
					('Red Hat Enterprise Linux'*)
						update_sysconfig=$(test "${os_major}" -lt 6 && echo true || echo false)
						;;
					('Red Hat Linux'*)
						update_sysconfig=true
						;;
					(*)
						printf 'Could not determine Red Hat distribution.\n' >&2
						printf "Please contribute an implementation for it if you can.\n" >&2
						exit 1
						;;
				esac
				;;
		esac

		if ${update_sysconfig:?}
		then
			export CDIST_ORDER_DEPENDENCY=true
			__file /etc/sysconfig/clock --state present \
				--owner root --group root --mode 0644
			__key_value /etc/sysconfig/clock:UTC \
				--file /etc/sysconfig/clock \
				--key UTC \
				--delimiter '=' --exact_delimiter \
				--value "$($local_clock && echo false || echo true)"
			unset CDIST_ORDER_DEPENDENCY
		fi
		;;
	(debian|devuan|ubuntu)
		os_major=$(sed 's/[^0-9].*$//' "${__global:?}/explorer/os_version")

		case ${os}
		in
			(debian)
				if test "${os_major}" -ge 7
				then
					update_rcS=false
				elif test "${os_major}" -ge 3
				then
					update_rcS=true
				else
					# Debian 2.2 should be supportable using rcS.
					# Debian 2.1 uses the ancient GMT key.
					# Debian 1.3 does not have rcS.
					printf "Your operating system (Debian %s) is currently not supported by this type (%s)\n" \
						"$(cat "${__global:?}/explorer/os_version")" "${__type##*/}" >&2
					printf "Please contribute an implementation for it if you can.\n" >&2
					exit 1
				fi
				;;
			(devuan)
				update_rcS=false
				;;
			(ubuntu)
				update_rcS=$(test "${os_major}" -lt 16 && echo true || echo false)
				;;
		esac

		if ${update_rcS}
		then
			export CDIST_ORDER_DEPENDENCY=true
			__file /etc/default/rcS --state present \
				--owner root --group root --mode 0644
			__key_value /etc/default/rcS:UTC \
				--file /etc/default/rcS \
				--key UTC \
				--delimiter '=' --exact_delimiter \
				--value "$($local_clock && echo no || echo yes)"
			unset CDIST_ORDER_DEPENDENCY
		fi		  
		;;
	(freebsd)
		# cf. adjkerntz(8)
		__file /etc/wall_cmos_clock \
			--state "$($local_clock && echo present || echo absent)" \
			--owner root --group wheel --mode 0444
		;;
	(netbsd)
		# https://wiki.netbsd.org/guide/boot/#index9h2
		__key_value /etc/rc.conf:rtclocaltime \
			--file /etc/rc.conf \
			--key rtclocaltime \
			--delimiter '=' --exact_delimiter \
			--value "$($local_clock && echo YES || echo NO)"
		;;
	(slackware)
		__file /etc/hardwareclock --owner root --group root --mode 0644 \
			--source - <<-EOF
		# /etc/hardwareclock
		#
		# Tells how the hardware clock time is stored.
		# This file is managed by cdist.

		$($local_clock && echo localtime || echo UTC)
		EOF
		;;
	(suse)
		if test -s "${__global:?}/explorer/os_release"
		then
			# shellcheck source=/dev/null
			os_version=$(. "${__global:?}/explorer/os_release" && echo "${VERSION}")
		else
			os_version=$(sed -n 's/^VERSION\ *=\ *//p' "${__global:?}/explorer/os_version")
		fi
		os_major=$(expr "${os_version}" : '\([0-9]\{1,\}\)')

		# TODO: Consider using `yast2 timezone set hwclock' instead
		if expr "${os_major}" \< 12
		then
			# Starting with SuSE 12 (first systemd-based version)
			# /etc/sysconfig/clock does not contain the HWCLOCK line
			# anymore.
			# With SuSE 13, it has been reduced to TIMEZONE configuration.
			__key_value /etc/sysconfig/clock:HWCLOCK \
				--file /etc/sysconfig/clock \
				--delimiter '=' --exact_delimiter \
				--key HWCLOCK \
				--value "$($local_clock && echo '"--localtime"' || echo '"-u"')"
		fi
		;;
	(void)
		export CDIST_ORDER_DEPENDENCY=true
		__file /etc/rc.conf \
			--owner root --group root --mode 0644 \
			--state present
		__key_value /etc/rc.conf:HARDWARECLOCK \
			--file /etc/rc.conf \
			--delimiter '=' --exact_delimiter \
			--key HARDWARECLOCK \
			--value "\"$($local_clock && echo localtime || echo UTC)\""
		unset CDIST_ORDER_DEPENDENCY
		;;
	(*)
		if ! $has_systemd_timedatectl
		then
			printf "Your operating system (%s) is currently not supported by this type (%s)\n" "$os" "${__type##*/}" >&2
			printf "Please contribute an implementation for it if you can.\n" >&2
			exit 1
		fi
		;;
esac

# NOTE: timedatectl set-local-rtc for systemd is in gencode-remote
# NOTE: /etc/adjtime is also updated in gencode-remote