Hi Sean,
On Thu, Sep 17, 2015 at 12:01 PM, Sean <smalde...@gmail.com> wrote:
> Hello,
>
> I have been working on trying to drive an include statement with an array
> parameter.
>
> The idea looks like so (in pseudo code) :
>
>
> class foo( $whitelist = $::foo::params::whitelist, $blacklist = [],) {
>
> $include_list = inline_template( "<% @whitelist - @blacklist %>" )
> validate_array($include_list)
> include $include_list
>
> }
>
> I picked up that inline template from a message in the group dating back
> to 2011.
>
The template is missing a '=' character to write the result, like so:
<%= @whitelist - @blacklist %>
However, this will return a string-ified version of the array and is not
what you want as include will treat it as a single class name.
In the current version of the Puppet language, two arrays can simply be
subtracted from one another:
$whitelist = [foo, bar, baz]
$blacklist = [bar]
include $whitelist - $blacklist
This would include "foo" and "baz", but not "bar".
> Basically, class foo has a ton of subclasses who's names populate the
> default value for $whitelist. Normally all these get applied, but I need
> to allow for deviations for specific cases, thus the blacklist.
>
> The issue seems to be that no matter what I put in whitelist or blacklist,
> include_list is always empty. What am I missing? I have also tried
> writing a Custom Function to do the same as the inline template but the
> result was not anymore successful, though the debugging was more difficult.
>
> Thanks for your thoughts on this!
>
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Peter Huene
Software Engineer, Puppet Labs
Puppet Open Source Team
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