# Calculate chmod=0755
#!/sbin/openrc-run
# Copyright 2020 Mir Calculate. http://www.calculate-linux.org
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

depend()
{
	after clock root swap
	before localmount
	keyword -docker -jail -lxc -openvz -prefix -systemd-nspawn -vserver
}

start()
{
	[[ -d /sys/block/zram0 ]] || modprobe zram
	if [[ -d /sys/block/zram0 ]]
	then
		if [[ $START == "always" ]] || [[ -z $(swapon --noheading) ]]
		then
			ebegin "Activating zram swap devices"
			local disksize;
			echo ${COMPRESSION:-zstd} >/sys/block/zram0/comp_algorithm
			if [[ ${DISKSIZE:-200%} =~ ^([0-9]+)%$ ]]
			then
				local perc="${BASH_REMATCH[1]}"
				local memorysize="$(free -b | awk '{if ($1 == "Mem:") {print $2}}')"
				disksize="$(( $memorysize * $perc / 100 ))"
			else
				disksize="${DISKSIZE}"
			fi
			echo $disksize >/sys/block/zram0/disksize
			mkswap -L zramswap /dev/zram0
			swapon -p 100 /dev/zram0 &>/dev/null
		fi
	fi
	eend 0 # If swapon has nothing todo it errors, so always return 0
}

stop()
{
	if [[ ${RC_RUNLEVEL} != "shutdown" ]] && [[ -n $(swapon --noheading | grep /dev/zram0) ]]
	then
		ebegin "Deactivating zram swap devices"
		swapoff /dev/zram0 &>/dev/null
		echo 1 >/sys/block/zram0/reset
	fi
	eend 0
}