Puppet users - Apr 2011 - Bake custom function in order to heck for a files existence (on the puppetmaster)

Hi guys,

I just try to cook up some ruby code to check for a files existence on the
puppetmaster. I tried to bake a custom function in order to be able to use
it in connection with an if statement in my manifests.

I''ve read the page about how to write custom functions ..

http://projects.puppetlabs.com/projects/puppet/wiki/Writing_Your_Own_Functions

.. but ain''t got any luck so far :/

Currently my function looks like this:

----------------------------------------------------------------------------
# cat /var/lib/puppet/lib/puppet/parser/functions/exists.rb;
module Puppet::Parser::Functions
  newfunction(:exists, :type => :rvalue) do |args|
    filename = args[0]
    File::exist?(filename)
  end
end
----------------------------------------------------------------------------

It also seems like it''s being recognized by puppet because no errors
occurs:

----------------------------------------------------------------------------
irb(main):003:0> require ''puppet''
=> true
irb(main):004:0> require /var/lib/puppet/lib/puppet/parser/functions/
.exists.rb.swp  exists.rb
irb(main):004:0> require
''/var/lib/puppet/lib/puppet/parser/functions/exists.rb''
=> true
irb(main):005:0> Puppet::Parser::Functions.function(:exists)
=> "function_exists"
----------------------------------------------------------------------------

The part of my manifest looks like this:

----------------------------------------------------------------------------
  if (exists("/path/to/file")) {
	[..my puppet code..]
  }
----------------------------------------------------------------------------

The "puppet code" somehow won''t get evaluated if the clients
catalog is
being build. If I remove the if-statement the respective code is being
execute on the respective client. Any ideas? I think that the function
doesn''t return anything and that''s the major problem!?

Cheers!

JD

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I was using the wrong path so the function seems to work as expected :)

On 04/19/2011 10:06 AM Jan wrote:
> Hi guys,
> 
> I just try to cook up some ruby code to check for a files existence on the
> puppetmaster. I tried to bake a custom function in order to be able to use
> it in connection with an if statement in my manifests.
> 
> I''ve read the page about how to write custom functions ..
> 
>
http://projects.puppetlabs.com/projects/puppet/wiki/Writing_Your_Own_Functions
> 
> .. but ain''t got any luck so far :/
> 
> Currently my function looks like this:
> 
>
----------------------------------------------------------------------------
> # cat /var/lib/puppet/lib/puppet/parser/functions/exists.rb;
> module Puppet::Parser::Functions
>   newfunction(:exists, :type => :rvalue) do |args|
>     filename = args[0]
>     File::exist?(filename)
>   end
> end
>
----------------------------------------------------------------------------
> 
> It also seems like it''s being recognized by puppet because no
errors occurs:
> 
>
----------------------------------------------------------------------------
> irb(main):003:0> require ''puppet''
> => true
> irb(main):004:0> require /var/lib/puppet/lib/puppet/parser/functions/
> .exists.rb.swp  exists.rb
> irb(main):004:0> require
> ''/var/lib/puppet/lib/puppet/parser/functions/exists.rb''
> => true
> irb(main):005:0> Puppet::Parser::Functions.function(:exists)
> => "function_exists"
>
----------------------------------------------------------------------------
> 
> The part of my manifest looks like this:
> 
>
----------------------------------------------------------------------------
>   if (exists("/path/to/file")) {
> 	[..my puppet code..]
>   }
>
----------------------------------------------------------------------------
> 
> The "puppet code" somehow won''t get evaluated if the
clients catalog is
> being build. If I remove the if-statement the respective code is being
> execute on the respective client. Any ideas? I think that the function
> doesn''t return anything and that''s the major problem!?
> 
> Cheers!
> 
> JD
> 
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