[chef] How to keep from resetting user password

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I want to use chef to maintain users with a default password while allowing 
the
user to change their password.  Each time I rerun chef-client, the user's
password gets reset.  Is there a way I can keep it from resetting back to the
default?  I'm thinking about only adding the password param if the entry isn't
already in /etc/passwd but it seems like there should be an easier way?