Puppet users - Jan 2009 - Checking for a class definition within an ERB file.

Hi all,

I''ve been toying around with this for a little while and find that my
ruby-fu is weak.

In the Puppet language, I can do the following:

if defined(Class["foo"]) { ...do stuff... }

How do I do that in an ERB file?

I.e.

<% if class(foo) then %>do stuff<% end %>

Or, is this impossible?

Thanks,

Trevor

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Trevor,

What version of Puppet?

You could pull that logic up into Puppet and use ''defined'' to
set a variable
then use that in the template.

Or if you have to do it in the template, you should be able to call that
same function with ''function_defined'' depending on the version
of Puppet.

You can try and see what methods you have in your version.

<% methods.sort.each do |m| -%>
  <%= m %> is part of the current scope
<% end -%>

Cheers,
Andrew



On Mon, Jan 19, 2009 at 12:35 PM, Trevor Vaughan
<peiriannydd@gmail.com>wrote:
>
> Hi all,
>
> I''ve been toying around with this for a little while and find that
my
> ruby-fu is weak.
>
> In the Puppet language, I can do the following:
>
> if defined(Class["foo"]) { ...do stuff... }
>
> How do I do that in an ERB file?
>
> I.e.
>
> <% if class(foo) then %>do stuff<% end %>
>
> Or, is this impossible?
>
> Thanks,
>
> Trevor
>
> >
>
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Should have posted that...0.24.6.

I tried pulling it up into Puppet, but it wasn''t very clean since I
had to do both an ''import foo'' and an ''include
foo'' to get it to see
the variables in a module.

I''ll try ''function_defined'' and see what happens.

Thanks,

Trevor

On Mon, Jan 19, 2009 at 16:21, Andrew Shafer <andrew@reductivelabs.com>
wrote:
> Trevor,
>
> What version of Puppet?
>
> You could pull that logic up into Puppet and use
''defined'' to set a variable
> then use that in the template.
>
> Or if you have to do it in the template, you should be able to call that
> same function with ''function_defined'' depending on the
version of Puppet.
>
> You can try and see what methods you have in your version.
>
> <% methods.sort.each do |m| -%>
>   <%= m %> is part of the current scope
> <% end -%>
>
> Cheers,
> Andrew
>
>
>
> On Mon, Jan 19, 2009 at 12:35 PM, Trevor Vaughan
<peiriannydd@gmail.com>
> wrote:
>>
>> Hi all,
>>
>> I''ve been toying around with this for a little while and find
that my
>> ruby-fu is weak.
>>
>> In the Puppet language, I can do the following:
>>
>> if defined(Class["foo"]) { ...do stuff... }
>>
>> How do I do that in an ERB file?
>>
>> I.e.
>>
>> <% if class(foo) then %>do stuff<% end %>
>>
>> Or, is this impossible?
>>
>> Thanks,
>>
>> Trevor
>>
>>
>
>
> >
>
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