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#!/bin/sh
#
# Copyright (c) 2019-2021 Mischa Peters <mischa @ openbsd.amsterdam>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
SLEEP=30
CPU=$(($(sysctl -n hw.ncpuonline)-2))

COUNTER=0
for i in $(vmctl show | sort | awk '/ running / {print $9}' | xargs); do
	VMS[${COUNTER}]=${i}
	COUNTER=$((${COUNTER}+1))
done

echo -n "Are you sure you want to power off ${COUNTER} vms? Press any key to continue... "
read input
echo -n "Are you really sure? Press any key to continue... "
read input

CYCLES=$((${#VMS[*]}/${CPU}+1))
echo "Stopping ${#VMS[*]} VMs on ${CPU} CPUs in ${CYCLES} cycle(s), waiting ${SLEEP} seconds after each cycle."

COUNTER=0
for i in ${VMS[*]}; do
	COUNTER=$((${COUNTER}+1))
	vmctl stop ${i}
	if [ $COUNTER -eq $CPU ]; then
		sleep ${SLEEP}
		COUNTER=0
	fi
done
sleep 30