update packages for arch linux nspawn container

update_arch_nspawn_container

#!/bin/bash

nspawn-execute() {
	pid=$(machinectl -a -l status $1 | grep Leader | awk '{print $2}');
	echo "Execute on $1: nsenter -t $pid -m -i -n -p ${@:2}";
	nsenter -t $pid -m -i -n -p "${@:2}";
}

nspawn-execute-all() {
	for i in $(machinectl list | grep nspawn | awk '{print $1}');
	do
		nspawn-execute $i "${@:1}";
	done
}

yes | nspawn-execute-all pacman -Syu
yes | nspawn-execute-all pacman -Scc
nspawn-execute-all pacman-optimize

Most of this script is cited from http://iliyathenetworkguy.blogspot.jp/2016/04/systemd-nspawn-containers-command.html.