On 01/25/2012 05:48 AM, Walter Heck wrote:
>>> We'd also need a way to test if a capability is being provided by the
>>> >> system as a whole. Ie, a mysql module needs to be able to check if it
>>> >> needs to include resources for a firewall, monitoring, etc.
>> > Something like defined()? ;-)
> Come on, I thought we all agreed that defined is Nasty and Evil. At
> least make it defined_new() or maybe even defined2() :P
Great, now we're regressing back to thread that Nigel kicked me out of
for this :P
Fine, I'll play.
On 01/19/2012 07:56 PM, Nick Fagerlund wrote:
> Defined() doesn't suck! It's a 100% reliable way to check what classes
> and defined types are available to the autoloader. I challenge anyone
> to find me an example of this usage that fails.
>
> But trying to use it to see whether a specific resource instance has
> been declared is pure madness and must be stopped. It's defined(), not
> declared(), and it shouldn't accept resource references as arguments
> at all.
So there. In that thread, Nick gave pretty much the very use case
example Nan has referred to earlier in this thread, so I hope we can
agree that this can be handled by the (newly introduced?) declared()
function (or stripped down version of defined() that won't allow
resource reference parameters).
On 01/19/2012 09:17 PM, Nick Fagerlund wrote:
> So, you can conditionally declare the rule if the defined type is
> available to the autoloader, and otherwise you don't attempt to manage
> the firewall and expect that the user has read the documentation and
> will make a hole for the service themselves.
>
> if defined(firewall::iptables::rule) {
> firewall::iptables::rule {'mysql_server':
> ...etc. etc.
> }
> }
>
> See? It's just a way to peek around at what the user has installed.
Cheers,
Felix
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