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website: document required user vars

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Mitchell Hashimoto 2013-08-31 17:38:38 -07:00
parent ac2a4807d4
commit 2752db25c0
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website/source/docs/templates/user-variables.html.markdown vendored
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@ -48,6 +48,10 @@ In the above example, the template defines two variables: `aws_access_key` and
Later, the variables are used within the builder we defined in order to
configure the actual keys for the Amazon builder.
If the default value is `null`, then the user variable will be _required_.
This means that the user must specify a value for this variable or template
validation will fail.
Using the variables is extremely easy. Variables are used by calling
the user function in the form of <code>{{user &#96;variable&#96;}}</code>.
This function can be used in _any string_ within the template, in