Puppet users - Aug 2014 - Extracting Hostname from Hieradata as Manifest Nodenames

I am experimenting something to see if Puppet does the generic and 
self-provisioning that some laymen say they would like to see.

In the common.yaml, my hostname structure is something like:

:test: (environment name)
 - mocha-test1 (hostname)
 - glpi-49

:development:
 - timemachine



I am not sure whether people have done it or not, but I have seen people 
creating a generic manifest using a regex pattern matching for the host 
names stored in the Puppet Master catalog. Usually, it would be like:

node /^mi-cloud-(dev|stg|prd)-host/ {
    if $is_virtual == 'false' {
        include etchosts
        include checkmk-agent
        include nmonitor
        include rootsh
        include sysstatpkg
        include cronntpdate
        include fstab-ds-dev
    }
}

On the other hand, I was thinking of looping in the manifest in the likes 
of something below:

$env1 = hiera('test')
$env2 = hiera('development')

node $env1[$name] {
      notify("Now at Test environment $env1[0]");
      <do whatever activity here>
}

node $env1[$name] {
      notify("Now at Test environment $env2[0]");
      <do whatever activity here>
}



According to a colleague of mine who went for the workshop 6 months ago, 
the Puppet trainers have claimed that of no such concept of 
self-provisioning exists in there. In most examples that I've looked around 
on the Internet, it's mostly done on file, services and others, but not on 
nodes. However, the information he shared was based around version 3.4 / 
3.5.

1. Is it actually implementable?
2. Is there a high likely that the master system can be screwed up using 
that approach?
3. Is it a higher risk in managing and maintaining other agents in this 
approach rather than the individual one agent manifest thing?

If there's anyone who've seen and done that approach above, would be
great
if an example can be shared.

Thanks in advance.



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