mysql installed by macports mysql.user is empty

[Alex Yang]

 I use macport install mysql-5 in mac snow leopard, after changging
 permision of mysql directory under var/run and var/db, I can run
 mysql_install_db, but I cannot change root password or run mysql_security,
 I log in mysql under skip-grant, I see mysql.user is empty-set. Is there
 anyway to fix that?

 second question is, I use root run mysql, what user and group mysql use to
 access files.

 Thanks
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