On Tuesday, January 7, 2014 4:12:37 AM UTC-6, Klavs Klavsen wrote:
>
> I'm trying to modify certain users, created with by calling the define
> users::local.
>
> I tried to do it, by calling users::local::modify - but then puppet
> complains that only subclasses may modify.. :(
>
> What am I doing wrong here?
>
You are attempting to modify a declared resource. Although there are
sometimes valid reasons to do so, it is always at least a bit dodgy. I
certainly think it's questionable to establish a general-purpose mechanism
for such, as seems to be the intent here.
As far as the Puppet language goes, the resource override syntax you are
trying to use may only be used in a subclass of the class that originally
declared the target resource. The ability to perform such overrides is the
signature characteristic of Puppet subclasses, though it is rarely
highlighted any more. The concept there is that the subclass refines /
modulates the meaning of its parent class.
And no, defined types are not classes, and thus cannot be subclassed.
You would use that form of override more like so:
class myusers::alice {
users::local { 'alice':
uid => 501,
gid => 'users',
realname => 'Alice A. Anderson'
}
}
class myusers::admin_alice
inherits myusers::alice {
Users::Local['alice'] {
groups => [ 'admin' ]
}
}
Note, too, the conceptual distinction here: in the proposed override via a
defined type, the defined type is named as and serves as a *verb*("modify"),
whereas in the class-based example the classes represent
characteristics of the target node: that 'alice' is among the users, or
more specifically that 'alice' is an administrator.
With all that said, it *is* possible to override a resource declaration
made by an unrelated class via a resource collector. That it's possible
doesn't necessarily make it a good idea, but there are some valid
applications. In your specific case, the syntax would look like this:
User<| title == $title |> { groups => $groups }
Do not overuse.
John
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