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post_install() {
	# the installation process is described at https://code.google.com/p/munge/wiki/InstallationGuide
	# create munge /var/run/munge dir
	mkdir -p /var/run/munge

	# add munge user/group
	echo -e "\e[34;1m==>\e[39;1m Adding munge system group... \e[0m"
	groupadd -r munge

	echo -e "\e[34;1m==>\e[39;1m Adding munge system user... \e[0m"
	useradd -r -c "Munge Daemon" -d /var/log/munge -g munge munge

	echo -e "\e[34;1m==>\e[39;1m Locking Munge User Account... \e[0m"
	passwd -l munge &>/dev/null

	# create munge key
	if [ ! -e /etc/munge/munge.key ] && [ -c /dev/urandom ]; then
		echo -e "\e[34;1m==>\e[39;1m Creating random munge key : /etc/munge/munge.key\e[0m"
		dd if=/dev/urandom bs=1 count=1024 of=/etc/munge/munge.key
		chmod 0400 /etc/munge/munge.key
	else
		if [ -c /dev/urandom ]; then
			echo -e "\e[34;1m==>\e[39;1m INFO: no munge key is generated since /etc/munge/munge.key already exists \e[0m"
		else
			echo -e "\e[34;1m==>\e[39;1m WARNING: did not create /etc/munge/munge.key since /dev/urandom is not found \e[0m"
		fi
	fi

	# set permissions
	chown munge:munge -R /etc/munge
	chown munge:munge -R /var/log/munge
	chown munge:munge -R /var/lib/munge
	chown munge:munge -R /var/run/munge

	# securing the installation, this is optional!
	#chmod 0700 /etc/munge
	#chmod 0711 /var/lib/munge
	#chmod 0700 /var/log/munge
	#chmod 0755 /var/run/munge
}

post_upgrade() {
	# set permissions
	chown munge:munge -R /etc/munge
	chown munge:munge -R /var/log/munge
	chown munge:munge -R /var/lib/munge
	chown munge:munge -R /var/run/munge
	if [ -e /etc/munge/munge.key ]; then
		chmod 0400 /etc/munge/munge.key
	fi
}

pre_remove() {
	which systemctl >& /dev/null
	if [ $? -eq 0 ]; then
		echo -e "\e[34;1m==>\e[39;1m Stopping munge using SystemD... \e[0m"
		systemctl stop munge

		echo -e "\e[34;1m==>\e[39;1m Disabling SystemD related file(s)... \e[0m"
		systemctl disable munge.service
	else
		echo -e "\e[34;1m==>\e[39;1m Stopping munge... "
		/etc/rc.d/munge stop
	fi
}

post_remove() {
    # Removing obsolete dir
    rm -rf /var/run/munge

	# Notifying the user of kept dirs and change owner
	[ -d /etc/munge ] && chown root:root -R /etc/munge && echo -e "\e[34;1m==>\e[39;1m NOTE: Custom configuration-file(s) in /etc/munge/ were kept on your system.\e[0m"
	[ -d /var/log/munge ] && chown root:root -R /var/log/munge && echo -e "\e[34;1m==>\e[39;1m NOTE: Logfiles were preserved. They reside under /var/log/munge .\e[0m"

	echo -e "\e[34;1m==>\e[39;1m Removing the munge user and group from the system... \e[0m"
	userdel munge
}