Puppet users - Mar 2011 - Puppet dsl

Is the puppet dsl a complete Turing capable language?  

As I understand it, the chain is dsl -> compiled thing -> actions. 

What language is the compiled thing in? Ruby? 

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On Fri, Mar 4, 2011 at 8:50 AM, Kevin Beckford <lazyweb@gmail.com> wrote:
> Is the puppet dsl a complete Turing capable language?
>
Puppet is not a general purpose programming language, it is a tool that
manages infrastructure, you could probably mathematically prove that it is
Turing complete, but its end result is a single data format. Perhaps it
would be better to ask

"can Puppet do X"

> As I understand it, the chain is dsl -> compiled thing -> actions.
>
Architecturally, it is better to think of Puppet as a system that can
transform between various data formats:

Code that creates data:              Data:
   Facts Terminus (Facter)             Facts:
   Node Terminus                           Nodes
   Catalog Terminus (compiler)      Catalog
   Resource Abstraction Layer       Events

> What language is the compiled thing in? Ruby?
>
The compiled artifact is not code, it is data that describes the desired
state of your system, in the above chart, the artifact you are asking about
is the catalog.


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On Mar 4, 9:18 am, Dan Bode <d...@puppetlabs.com>
wrote:
> > What language is the compiled thing in? Ruby?
>
> The compiled artifact is not code, it is data that describes the desired
> state of your system, in the above chart, the artifact you are asking about
> is the catalog.
>
*nods.* The catalog is just a directed acyclic graph describing
resources and dependencies, which then gets serialized via a common
text data format. It isn''t code; it''s a document, which gets
consumed
by code that knows how to generate events from resources.

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On 03/04/2011 05:50 PM, Kevin Beckford wrote:
> Is the puppet dsl a complete Turing capable language?  
No. There is no while loop.
> As I understand it, the chain is dsl -> compiled thing -> actions. 
> What language is the compiled thing in? Ruby? 
Do you have puppet installed? You will find your catalog (the compiled
thing) in /var/lib/puppet.

It is saved as a YAML serialized ruby object. Actions are performed by
the puppet agent using two inputs:
1. the catalog (how should things be)
2. the system state (what are things like now)
The difference determines the actions.

HTH,
Felix

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