freebsd-ports/databases/mysql40-server/pkg-install

#!/bin/sh

PATH=/bin:/usr/sbin
if [ -z "${DB_DIR}" ]; then
	DB_DIR=/var/db/mysql
fi

case $2 in
POST-INSTALL)
	USER=mysql
	GROUP=${USER}
	UID=88
	GID=${UID}

	if pw group show "${GROUP}" 2>/dev/null; then
		echo "You already have a group \"${GROUP}\", so I will use it."
	else
		if pw groupadd ${GROUP} -g ${GID}; then
			echo "Added group \"${GROUP}\"."
		else
			echo "Adding group \"${GROUP}\" failed..."
			exit 1
		fi
	fi

	if pw user show "${USER}" 2>/dev/null; then
		echo "You already have a user \"${USER}\", so I will use it."
	else
		if pw useradd ${USER} -u ${UID} -g ${GROUP} -h - \
			-d ${DB_DIR} -s /sbin/nologin -c "MySQL Daemon"
		then
			echo "Added user \"${USER}\"."
		else
			echo "Adding user \"${USER}\" failed..."
			exit 1
		fi
	fi

	chown -R ${USER}.${GROUP} ${DB_DIR}
	;;
esac