Given the resource you want to apply this pattern to, it can be turned into
a one-liner with a collector:
file { '/tmp/something':
ensure => file,
}
File['/tmp/something'] ~> Service <| title == 'apache2' |>
This means that if there is a service with a title of apache2 EVER added to
the catalog, it'll be refreshed on file changes. If the service doesn't
exist, then the dependency does nothing.
Now, this isn't exactly what you asked since you wanted the variable
$services_to_notify and didn't say what you're going to do with it, but I
assume this is what you want? Because collectors are not parse-order
specific, you can't do variable assignments like $services_to_notify =
Service <| title == 'apache2' |> (because variables are evaluated in parse
order and collectors are not).
If you really want to make a function that searches the catalog and returns
references, it can be done with something like
`scope.catalog.resource('Service[apache2]')` inside the function I believe,
though that may not be the exact call.
-Hunter
On Wed, Mar 23, 2016 at 12:40 PM, Matt Zagrabelny <mzagr...@d.umn.edu>
wrote:
> Greetings Puppet Users,
>
> I have a chuck of code I'd like to centralize - you know DRY.
>
> I've looked into a custom function, but I'm uncertain how to get at
> the the puppet resources inside of ruby.
>
> Here is the verbatim copy of the chuck in a puppet manifest:
>
> if defined(Service['apache2']) {
> $services_to_notify = [
> Service['apache2'],
> ]
> }
> else {
> $services_to_notify = []
> }
>
> and here is some hand-wavy pseudocode:
>
> function return_service_array_if_defined($service) {
> if defined(Service[$service]) {
> return [
> Service[$service],
> ]
> }
> else {
> return []
> }
> }
>
> Any suggestions or ideas for implementation?
>
> Thanks!
>
> -m
>
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