One side effect of this change would appear to be the inability to use/test a 
new hiera, uh, hierarchy or backend in a feature branch without affecting the 
master branch.

Sent from my Windows 10 phone

From: Eric Sorenson
Sent: Monday, March 14, 2016 5:43 PM
To: Puppet Developers
Subject: [Puppet-dev] Signal boost on HI-490 - moving hiera.yaml out ofcodedir

As a result of some introspection around r10k workflows, I came to agree with 
the statement in the title of HI-490: "the location of hiera.yaml in 
puppet-agent is a mistake." The root of the problem is that the current 
hiera.yaml is a mixture of global configuration (datadir location, merge 
behaviour, the backend configuration) and "code" like settings, namely the 
hierarchy itself. We chose to put it in $codedir but this has caused problems 
when people try to manage the file with puppet modules because it then 
conflicts with the control repo/r10k deploy workflow. (The PE-13367 ticket I 
mention in the description there is about the file sync service, but more 
generally r10k+webook management runs into the same problem.)

There was some conversation that spun off into a google doc and seemed to 
coalesce around the following proposal:

1. puppet-agent packaging would be updated to install a default hiera.yaml at 
$confdir/hiera.yaml
2. both puppet and hiera would check in the old location, $codedir/hiera.yaml, 
and fall back to the new location $confdir/hiera.yaml 
3. we would document the new location and encourage users to move their 
hiera.yaml
This then raises the question of when we yank support for the old location, 
$codedir/hiera.yaml. Here the suggestion is:
1. for puppet-agent this happens in a major release of puppet/hiera/puppet-agent
2. for Puppet Enterprise additionally, we check if there is a 
$codedir/hiera.yaml and block the upgrade if it exists
I wanted to raise visibility on this and see what the wider puppet-dev audience 
thought. Please feel free to chime in here or on the ticket and I'll summarize 
before taking any action.

--eric0
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