On Monday, 28 January 2013 11:14:59 UTC-5, jcbollinger wrote:
> define site::user (
>> $comment,
>> $ensure,
>> $home,
>> $name = $title,
>>
>
>
> Don't do that ($name = $title). Puppet provides it automatically (both
> the parameter and the default).
>
In this case, $name is the login name of the user being created .. it's a
valid parameter of the 'user' resource type. I'm not sure how I'm supposed
to do not use it. I have read the Puppet reference manual.. but not for
puppet 3, since I'm not using that.
> Moreover, I am uncertain whether it is safe anyway to use $title as a
> resource default. It certainly *isn't* safe to use explicit resource
> properties, regardless of the order in which they are listed.
I'n not sure what you mean by that. Using $title as a default is widely
used (see namevar) .. I'm not sure what you mean about explicit resource
properties.
> The usual paradigm is this:
> define mymodule::foo ( $param1 = 'NOTSET' ) {
> $real_param1 = $param1 ? {
> 'NOTSET' => <some-appropriate-value-maybe-undef>,
> default => $param1
> }
> sometype { $name:
> param => $real_param1
> }
> }
> Yes, it's a bit clunky, but it works.
This is great if I want to set my own defaults, but I don't. The 'user'
resource already has its own way of handling unspecified parameters, and I
don't want to override those unless absolutely necessary. I think the
above would require me to re-implement a bunch of its defaults logic, which
would be especially problematic for things like 'gid'.
> No, Puppet doesn't have anything like that. The closest would probably be
> the create_resources() function, which you can read about in the docs.
I'll have a look.. maybe there's some way I can make use of it.
> I'm surprised you didn't find an example like the one above. It appears
> all over the place, not least in the archives of this group.
>
Also, have you read the official Puppet DSL docs (at
> http://docs.puppetlabs.com/puppet/3/reference/)? They don't answer your
> particular question, but they would have told you about $name, and they
> have a lot of other useful information.
The only occurrence of the string "name" in the DSL doc at that location is
as a placeholder... and it applies to ruby, not puppet manifests. I don't
see anything there about use of $name inside a puppet class.
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