Issue #22121 has been updated by Yoann Le Touche.
At the start of the section you have the short version of the explanation
telling you to test if @variable is nil
> Short version: When testing for undefinedness, check whether the instance
> variable (@variable) is nil – if the corresponding Puppet variable is either
> undefined or explicitly set to undef, the instance variable will reliably
> have a value of nil.
>
> This only works for local variables, so if you need to test variables from
> other scopes, you must copy them to local scope in the manifest before
> evaluating the template:
# manifest:
$in_var = $outside_scope::outside_var
# template:
<% if @in_var %>
outside_var has <%= @in_var %> value
<% end %>
The long version gives you the why in detail.
----------------------------------------
Bug #22121: Documentation about testing for existence of variable in template
is subtly wrong
https://projects.puppetlabs.com/issues/22121#change-98324
* Author: Thomas Vander Stichele
* Status: Closed
* Priority: Normal
* Assignee: Yoann Le Touche
* Category: documentation
* Target version:
* Affected Puppet version:
* Keywords: template, test, variable
* Branch:
----------------------------------------
http://docs.puppetlabs.com/guides/templating.html
If the variable is defined but false, if @variable is false just the same.
So using @ cannot be used purely to test definedness.
In my template, I worked around it like this:
<% if @require_valid_user == false -%>
require_valid_user = false
<% elsif @require_valid_user == true -%>
require_valid_user = true
<% else -%>
; require_valid_user = false
<% end -%>
I suggest updating the docs at least, or providing a real way to test for
definedness-but-nothing-else.
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