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Title       : 	Chef: include_recipe only_if or not_if
Author      : 	Remy van Elst
Date        : 	06-10-2013
URL         : 	https://raymii.org/s/tutorials/Chef_include_recipe_only_if_not_if.html
Format      : 	Markdown/HTML
Chef supports including other recipes in cookbooks, for example, I can include
the MySQL recipe from a PHP recipe. However, this is not a normal resource but a
normal method. Therefore it ignores anything passed to it, including only _if or
not_ if. This tutorial shows you how to include or not include a recipe based on
a variable, comparable with not _if or only_ if.

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Lets say you have a default recipe for all your nodes. It is a simple cookbook
which includes other recipes via `include_recipe`. It sets standard
configuration like users, ssh settings, mail settings and other stuff you want a
server to have.
But what if you want to deploy a mailserver, which has other config than is
included in your default recipe, but do want all the other stuff from the
recipe? Probably you would change your recipe to something like:
    include_recipe "postfix::server" do
      only_if node["defaults"]["postfix_server"] = true
This won't work. As said above, `include_recipe` is not a normal resource (like
`template` or `user`) but a method. Therefore it ignores anything passed to it,
including only _if or not_ if.
The solution is quite simple, it fall back to using normal Ruby.
Note, there probably are more elegant solutions for this, but I find this to
work quite well.
Instead of the above, try adding this to your cookbook:
    this_node_is_postfix_server = node["defaults"]["postfix_server"] unless node["defaults"]["postfix_server"].nil?
    include_recipe "postfix::server" if this_node_is_postfix_server
As you can see, regular Ruby fixes this problem.
   [1]: https://www.digitalocean.com/?refcode=7435ae6b8212
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