On Nov 17, 11:23 am, Justin Lloyd <jstn...@gmail.com> wrote:
> Thanks for the feedback. I do see the same behavior and I no longer need to
> do this but I am confused by your suggestion to not use += even though it's
> a valid Puppet capability.
The C language has a standard feature referred to as 'trigraphs'. I
have never heard any commentary about it that did not one way or
another recommend avoiding it. And most people do.
Similarly, the fact that Puppet supports += does not imply that it's a
good idea to use it. I recommend against it because it has a fairly
high likelihood of misleading you about what it's actually doing.
Even once you master it, the same still applies to anyone else who
needs to work on your manifests in the future.
> My simplified example was actually based on a parameterized activemq class.
> In my MCollective server's node definition I'd have
>
> class { "activemq": application => "mcollective" }
>
> while in another regex-based node definition, based on requirements of a
> team I help support (called Transform for short), I'd have
>
> class { "activemq": application => "transform" }
>
> Then in the activemq class I wanted to specify the list of packages to
> install for activemq, leaving out the java package since the Transform
> systems would already have java installed separately. Hence I'd have a
> single list of packages with a += if $application == "transform". The +=
> was to avoid repetition of package names. You mention hacking something
> together with inline_template and split (which I've used in other
> situations), but I was shooting for a more elegant solution.
I also suggested writing an array concatenation custom function. I'd
consider that more elegant than hacking up an array concatenation via
inline_template() and split(), not least because it would be
reusable. Or you could just specify the complete list of packages for
each case, and assign one or the other via an appropriate conditional.
John
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