Puppet users - Oct 2011 - how to use optional parameters

New to puppet and I just don''t understand how to do this. Apologies in
advance if it''s a dumb question.

Let''s say I have a module called httpd and inside that is a class
called  httpd::service, which accepts a couple of parameters:

class httpd::service (
   $running      = ''running'',
   $enabled      = ''true'',
) {
  service { "httpd":
   path      => "/etc/init.d/httpd",
   ensure    => $running,
   enable    => $enabled,
   require   => [ Package[ "httpd" ], File[
"/etc/httpd/conf/httpd.conf" ] ],
   subscribe => File[ "/etc/httpd/conf/httpd.conf" ],
  }
}

But let''s say that I want to allow the option of both requiring and
subscribing to a second file -- any file -- in addition to httpd.conf.
If I were doing this in a procedural language, I''d probably do
something naive and create a couple of empty parameters called
$also_subscribed and $myfile_path, use a conditional to see if it''s
defined, then create the arguments to require and subscribe based on
that.

I cannot figure out how to get this done in puppet. Any help is
appreciated, even a link to an appropriate doc or example. Thanks!

-- 
You received this message because you are subscribed to the Google Groups
"Puppet Users" group.
To post to this group, send email to puppet-users@googlegroups.com.
To unsubscribe from this group, send email to
puppet-users+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/puppet-users?hl=en.

On 10/08/2011 12:28 AM, maillists0@gmail.com wrote:
> New to puppet and I just don''t understand how to do this.
Apologies in
> advance if it''s a dumb question.
>
> Let''s say I have a module called httpd and inside that is a class
> called  httpd::service, which accepts a couple of parameters:
>
> class httpd::service (
>     $running      = ''running'',
>     $enabled      = ''true'',
> ) {
>    service { "httpd":
>     path      =>  "/etc/init.d/httpd",
>     ensure    =>  $running,
>     enable    =>  $enabled,
>     require   =>  [ Package[ "httpd" ], File[
"/etc/httpd/conf/httpd.conf" ] ],
>     subscribe =>  File[ "/etc/httpd/conf/httpd.conf" ],
>    }
> }
>
> But let''s say that I want to allow the option of both requiring
and
> subscribing to a second file -- any file -- in addition to httpd.conf.
> If I were doing this in a procedural language, I''d probably do
> something naive and create a couple of empty parameters called
> $also_subscribed and $myfile_path, use a conditional to see if
it''s
> defined, then create the arguments to require and subscribe based on
> that.
>
> I cannot figure out how to get this done in puppet. Any help is
> appreciated, even a link to an appropriate doc or example. Thanks!
I would use definition instead of class and it would look similar to this:

define httpd::service (
    running      = ''running'',
    enabled      = ''true'',
    path         = ''/etc/init.d/httpd'',
    require      = [ Package[ "httpd" ], File[ 
"/etc/httpd/conf/httpd.conf" ] ],
    subscribe    = File[ "/etc/httpd/conf/httpd.conf" ],
) {
   service { "httpd":
    path      => $path,
    ensure    => $running,
    enable    => $enabled,
    require   => $require,
    subscribe => $subscribe,
   }
}

Now you''re able to override default values in this way:

httpd::service { path => ''/some/path'', }

You can also use assign array here:

$array = [ ''/some/path'', ''/another/path'' ]
httpd::service { path => $array, }

-- 
Dominik Zyla

-- 
You received this message because you are subscribed to the Google Groups
"Puppet Users" group.
To post to this group, send email to puppet-users@googlegroups.com.
To unsubscribe from this group, send email to
puppet-users+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/puppet-users?hl=en.