Puppet users - Mar 2010 - $title as default value for argument in defintion

Hey there,

I''d like to provide a definition with an argument which is optional
and defaults to the title:

net::route_default{"first": gateway => "192.168.0.1"}
or the shortcut:
net::route_default{"192.168.0.1"}


class net {
  define route_default($gateway=$title) {
    exec {"echo $gateway >> /etc/defaultrouter":
      unless  => "grep $gateway /etc/defaultrouter"
    }
...
}
node foo {
  net::route_default{"192.168.0.1"}
}

trying it with noop:

notice: //Node[myhost.local]/Net::Route_default[192.168.0.1]/Exec[echo
myhost.local >> /etc/defaultrouter]/returns: is notrun

Funny - puppet substitutes $title with the fully qualified hostname -
can someone shed some light on this one? :)

Thanks & cheers Robert

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robert.gstoehl wrote:
> I''d like to provide a definition with an argument which is
optional
> and defaults to the title:
> 
> net::route_default{"first": gateway =>
"192.168.0.1"}
> or the shortcut:
> net::route_default{"192.168.0.1"}
Do it like this:

     define route_default($gateway="")
     {
         if $gateway == "" {
             $xgateway = $title
         } else {
             $xgateway = $gateway
         }
         # Use $xgateway here instead of $gateway
     }

>   define route_default($gateway=$title) {
>     exec {"echo $gateway >> /etc/defaultrouter":
>       unless  => "grep $gateway /etc/defaultrouter"
>     }
> ...
> Funny - puppet substitutes $title with the fully qualified hostname -
> can someone shed some light on this one? :)
The default values for definition parameters are evaluated when the
definition is defined, not when the definition is used.  And when
you are outside of definitions, $title is set to the node name.


	/Bellman

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makes sense, thanks

Robert

On Mar 8, 4:19 pm, Thomas Bellman <bell...@nsc.liu.se>
wrote:
> robert.gstoehl wrote:
> > I''d like to provide a definition with an argument which is
optional
> > and defaults to the title:
>
> > net::route_default{"first": gateway =>
"192.168.0.1"}
> > or the shortcut:
> > net::route_default{"192.168.0.1"}
>
> Do it like this:
>
>      define route_default($gateway="")
>      {
>          if $gateway == "" {
>              $xgateway = $title
>          } else {
>              $xgateway = $gateway
>          }
>          # Use $xgateway here instead of $gateway
>      }
>
> >   define route_default($gateway=$title) {
> >     exec {"echo $gateway >> /etc/defaultrouter":
> >       unless  => "grep $gateway /etc/defaultrouter"
> >     }
> > ...
> > Funny - puppet substitutes $title with the fully qualified hostname -
> > can someone shed some light on this one? :)
>
> The default values for definition parameters are evaluated when the
> definition is defined, not when the definition is used.  And when
> you are outside of definitions, $title is set to the node name.
>
>         /Bellman
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