Issue #11900 has been updated by Kelsey Hightower.

> Kelsey -- correct me if I'm wrong, but I believe ENC evaluation happens 
> *after* environment determination, and therefore ENC values are not available 
> in `puppet.conf` sections to determine, for example, which module path to 
> consult for a particular node.  
>

ENC does have the ability to set the environment for a node see: [External 
Nodes](http://docs.puppetlabs.com/guides/external_nodes.html), it just does not 
work 100% #3910

> In my environment (and I'm not Mike obviously, but we talked this through on 
> IRC and our use-case is quite similar) we do have an ENC but would like to 
> have the ability to run code (even as simple as Mike's `split` example on the 
> environment string) to do something more complex than inline interpolation of 
> the client-provided $environment into the module path.

You could use the built-in split function on the `$environment` var inside of 
your manifests. [Puppet Split 
Function](http://docs.puppetlabs.com/references/2.6.8/function.html#split)

----------------------------------------
Feature #11900: Dynamic environment interpolation in puppet master configuration
https://projects.puppetlabs.com/issues/11900

Author: Mike McLane
Status: Needs More Information
Priority: Normal
Assignee: Mike McLane
Category: server
Target version: 
Affected Puppet version: development
Keywords: dynamic environment, puppet master configuration, interopolated 
configuration, environment parameter
Branch: 


In providing a single Puppet master to multiple teams, where each team has 
their own test/release cadence, we maintain that each team would like to 
include their own dynamic module path based on the environment passed from the 
agent.  We have a re-usability case where an enterprise level of common modules 
is provided at the lowest path inclusion priority, the local team has a set of 
common modules at the next highest level of include priority, and then the 
dynamic environment has the highest level of inclusion priority.  This allows 
for development and testing cases to be carried out through dynamic pulls of 
environment-labeled branches in git.  

Some form of regex matching of the environment to the configuration section, 
might help in this regard.

In such a setup it would be nice to configure a puppet master as:

<pre>
[teama*]
 manifest   =  $confdir/environments/manifests/teamb/$environment/site.pp
 modulepath =  
$confdir/environments/modules/teamb/$environment/:$confdir/common/modules/teamb/:$confdir/common/modules/enterprise/
 
[teamb*]
 manifest   =  $confdir/environments/manifests/teama/$environment/site.pp
 modulepath =  
$confdir/environments/modules/teama/$environment/:$confdir/common/modules/teama/:$confdir/common/modules/enterprise/
</pre>

...or, alternatively.. such a case where the environment passed in is parsed 
within the configuration, allowing config-file variables to be set as such:

<pre>
[production]
# passed in $environment = "team-production-product"
  $group = $environment.split("-")[0]
# $releasecycle = $environment.split("-")[1]
# $product = $environment.split("-")[2]
 manifest   =  $confdir/environments/manifests/$group/$environment/site.pp
 modulepath =  
$confdir/environments/modules/$group/$environment/:$confdir/common/modules/$group/:$confdir/common/modules/enterprise/
</pre>

Within the base environments path, I would initialize the directory as a git 
repository and keep a post-receive wrapper script to dynamically fetch 
environments based on the $environment path.



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