Puppet users - Jan 2013 - Variable parsing and resolving order...

Hi.  I actually posted this question at the Puppet webinar.  I am a 
software developer using puppet to automate the installation custom 
software.  I had a question involving variable parsing order.  It has been 
mentioned that Puppet variables are parse-order-dependent, though sometimes 
seems totally random or independent of any order.  Is there a way to order 
or chain variable parsing (in an instance where parsing seems to be at 
random), kind of how resource execution can be ordered in a manifest?  I 
know this isn''t traditionally how puppet works, but I was curious as to
any
trick that may accomplish something like this.  To give a little context, I 
want to assign a variable a value that only becomes existent after it is 
created by the execution of a particular exec resource.  But when a 
manifest is applied, variables are checked before resources are executed.  
So on and so forth....  Even if this isn''t possible (assigning a
variable
after resource execution), a way to at least order the parsing of the 
variables in the phase before resource execution would prove very helpful.  
I apologize if this seems trivial to anyone.  Honestly I hope that it is.  
Thanks a bunch!!  

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On 01/08/2013 10:07 PM, mmcbride@spryinc.com wrote:
> I know this isn''t traditionally how puppet works, but I was
> curious as to any trick that may accomplish something like this.
I''m afraid you answered your own question in the first part of the 
sentence. It''s not possible AFAIK.

And why would you want that in the first place? Can you provide code sample?

> give a little context, I want to assign a variable a value that only
> becomes existent after it is created by the execution of a particular
> exec resource   But when a manifest is applied, variables are checked
> before resources are executed.
If you''re talking about facts, they are gathered *before* manifest 
compilation, so if you depend upon some fact value that is set only 
after installation of some package, you have to run puppet twice to 
bring your system to desired state.

And, again, can you provide code sample?

> I apologize if this seems trivial to anyone.
No need to apologize. Problem is you are trying to use *declarative* 
language as a procedural one. In most cases I''ve seen on this list, you
don''t need to do that at first place. So please show us your real-world
problems and maybe someone can pinpoint solution for you.


-- 
Jakov Sosic
www.srce.unizg.hr

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