Issue #2716 has been updated by Robin Bowes.

Volcane,

Have you any thoughts on how else this might be achieved?

I personally can't see why the modulepath idea is so bad. Perhaps some 
additional (debug)logging would be good so puppet logs the full path of the 
module when loaded so it's possible to trace which files are being used?

R.
----------------------------------------
Refactor #2716: Provide some way to override puppet classes
http://projects.reductivelabs.com/issues/2716

Author: Robin Bowes
Status: Re-opened
Priority: Normal
Assigned to: 
Category: modules
Target version: 
Affected version: 0.25.1rc1
Branch: 


I like to try and write generic puppet modules, ie. they are standalone as much 
as possible and should work in copied and pasted into another puppet 
environment. However, sometimes I may want to use a generic module but override 
the configuration.

I generally write my modules like this:

<pre>vsftpd
|-- files
|   `-- vsftpd.conf
`-- manifests
    |-- config.pp
    |-- init.pp
    |-- install.pp
    `-- service.pp</pre>

init.pp contains sometihng like this:

<pre>class vsftpd {
    require vsftpd::install, vsftpd::config, vsftpd::service
}</pre>

I had hoped that I could override classes by using modulepath like:

<pre>site/modules:generic/modules</pre>

I would put my generic modules in the generic/modules tree and over-ride 
specific class by putting them in the site/modules tree.

So, I created a vsftpd tree (as above) in generic/modules and created the 
following tree in site/modules:

<pre>vsftpd
`-- manifests
    `-- config.pp</pre>

I also added a module for my test node:

<pre>node
`-- manifests
    `-- a001.pp</pre>

a001.pp contains:

<pre>class node::a001 {
    include vsftpd
}</pre>

When I run puppetd --test on node a001, I get this error:

<pre># puppetd --test
info: Retrieving plugin
err: Could not retrieve catalog from remote server: Error 400 on SERVER: Could 
not find class vsftpd in namespaces node::a001 at 
/etc/puppet/site/modules/node/manifests/a001.pp:3 on node 
a001.private.statcounter.com
warning: Not using cache on failed catalog
err: Could not retrieve catalog; skipping run</pre>

It seems that puppet is finding site/modules/vsftpd and assuming that the 
vsftpd class is in site/modules/vsftpd/manifests/init.pp, which of course it 
isn't.

I suggest that puppet should look for <modulename>/manifests/init.pp (not just 
<modulename>) in each element of $modulepath before deciding that it can't find 
<modulename>. This would allow classes to be over-ridden.


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