[chef] Cookbook Architecture

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Hi Chefs,

We have come across this design pattern many times when building out our
cookbooks and can't quite decide which makes the most sense. Do you write your
cookbook such that the latest version of the cookbook can install any version
of the application it is installing/configuring or do you create separate
versions of the cookbook for each version of the cookbook (i.e. each cookbook
version installs only one version of the software)? The Opscode cookbooks seem
to go with the first strategy but we have found we can make simpler cookbooks
by going with the second strategy.

Any thoughts?