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#!/sbin/openrc-run
# Copyright 1999-2019 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

_get_lvm_path() {
	local lvm_path=
	for lvm_path in /bin/lvm /sbin/lvm ; do
		[ -x "$lvm_path" ] && break
	done
	echo "${lvm_path}"
}

_need_lvmetad()
{
	local lvm_path="$(_get_lvm_path)"
	[ ! -x "${lvm_path}" ] && return 1
	${lvm_path} dumpconfig global 2>/dev/null | grep -q 'use_lvmetad=1'
}

_need_lvmlockd()
{
	local lvm_path="$(_get_lvm_path)"
	[ ! -x "${lvm_path}" ] && return 1
	${lvm_path} dumpconfig global 2>/dev/null | grep -q 'use_lvmlockd=1'
}

depend() {
	before checkfs fsck
	after modules device-mapper
	# We may use lvmetad based on the configuration. If we added lvmetad
	# support while lvm2 is running then we aren't dependent on it. For the
	# more common case, if its disabled in the config we aren't dependent
	# on it.
	config /etc/lvm/lvm.conf
	local _need=
	if service_started; then
		_need=$(service_get_value need)
	else
		if _need_lvmetad; then
			_need="${_need} lvmetad"
		fi
		if _need_lvmlockd; then
			_need="${_need} lvmlockd"
		fi
	fi
	need sysfs udev ${_need}
}

config='global { locking_dir = "/run/lock/lvm" }'

dm_in_proc() {
	local retval=0
	for x in devices misc ; do
		grep -qs 'device-mapper' /proc/${x}
		retval=$((${retval} + $?))
	done
	return ${retval}
}

start() {
	# LVM support for /usr, /home, /opt ....
	# This should be done *before* checking local
	# volumes, or they never get checked.

	# NOTE: Add needed modules for LVM or RAID, etc
	#       to /etc/modules.autoload if needed
	lvm_path="$(_get_lvm_path)"
	for lvm_path in /bin/lvm /sbin/lvm ; do
		[ -x "$lvm_path" ] && break
	done
	if [ ! -x "$lvm_path" ]; then
		eerror "Cannot find lvm binary in /sbin or /bin!"
		return 1
	fi
	if [ -z "${CDBOOT}" ] ; then
		if [ -e /proc/modules ] && ! dm_in_proc ; then
			modprobe dm-mod 2>/dev/null
		fi
		if [ -d /proc/lvm ] || dm_in_proc ; then
			ebegin "Setting up the Logical Volume Manager"
			#still echo stderr for debugging
			lvm_commands="#!${lvm_path}\n"
			# Extra PV find pass because some devices might not have been available until very recently
			lvm_commands="${lvm_commands}pvscan --config '${config}'\n"
			# Now make the nodes
			lvm_commands="${lvm_commands}vgscan --config '${config}' --mknodes\n"
			# And turn them on!
			lvm_commands="${lvm_commands}vgchange --config '${config}' --sysinit -a ly\n"
			if _need_lvmlockd; then
				# Start lockd VGs as required
				lvm_commands="${lvm_commands}vgchange --config '${config}' --lock-start --lock-opt auto\n"
			fi
			# Order of this is important, have to work around dash and LVM readline
			printf "%b\n" "${lvm_commands}" | $lvm_path /proc/self/fd/0 >/dev/null
			eend $? "Failed to setup the LVM"
		fi
	fi
}

start_post()
{
	# Save if we needed lvmetad
	if _need_lvmetad; then
		service_set_value need lvmetad
	fi
}

stop() {
	for lvm_path in /bin/lvm /sbin/lvm ; do
		[ -x "$lvm_path" ] && break
	done
	if [ ! -x "$lvm_path" ]; then
		eerror "Cannot find lvm binary in /sbin or /bin!"
		return 1
	fi

	# Stop LVM2
	if [ -x /sbin/vgs ] && \
		[ -x /sbin/vgchange ] && \
		[ -x /sbin/lvchange ] && \
		[ -f /etc/lvmtab -o -d /etc/lvm ] && \
		[ -d /proc/lvm  -o "`grep device-mapper /proc/misc 2>/dev/null`" ]
	then
		einfo "Shutting down the Logical Volume Manager"

		VGS=$($lvm_path vgs --config "${config}" -o vg_name --noheadings --nosuffix --rows 2> /dev/null)

		if [ "$VGS" ]
		then
			local _ending="eend"
			[ "$RC_RUNLEVEL" = shutdown ] && _ending="ewend"
			ebegin "  Shutting Down LVs & VGs"
				#still echo stderr for debugging
				lvm_commands="#!${lvm_path}\n"
				# Extra PV find pass because some devices might not have been available until very recently
				lvm_commands="${lvm_commands}lvchange --config '${config}' --sysinit -a ln ${VGS}\n"
				# Now make the nodes
				lvm_commands="${lvm_commands}vgchange --config '${config}' --sysinit -a ln ${VGS}\n"
				# Order of this is important, have to work around dash and LVM readline
				printf "%b\n" "${lvm_commands}" | $lvm_path /proc/self/fd/0 --config "${config}" >/dev/null
			rc=$?
			msg="Failed (possibly some LVs still needed for /usr or root)"
			[ "$RC_RUNLEVEL" = shutdown ] && msg="${msg} [rc=$rc]" && rc=0
			${_ending} $rc "${msg}"
		fi

		einfo "Finished shutting down the Logical Volume Manager"
		return 0
	fi
}

# vim:ts=4