Puppet users - Apr 2011 - Optional requires?

A discussion on IRC about having classes that depend on each other
sometimes (i.e. a munin class that needs to do mysql-specific things
on those hosts where mysql is installed) reminded me of a feature
I''ve wanted for some time in puppet, that I don''t think I ever
actually shared/asked about:

I''ve been wanting something like require => that only kicksoff if
the required thing is actually defined.  So you could do:

  file { "munin.d/mysql-config":
    require_if_exists => Package[mysql]
  }

and if Package[mysql] isn''t set up anywhere, nothing happens.

Does this seem reasonable to people?  If so, where should I put it
in as a feature request?

-Robin

-- 
http://singinst.org/ :  Our last, best hope for a fantastic future.
Lojban (http://www.lojban.org/): The language in which "this parrot
is dead" is "ti poi spitaki cu morsi", but "this sentence is
false"
is "na nei".   My personal page: http://www.digitalkingdom.org/rlp/

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On Fri, Apr 1, 2011 at 6:34 AM, Robin Lee Powell <
rlpowell@digitalkingdom.org> wrote:
>
> A discussion on IRC about having classes that depend on each other
> sometimes (i.e. a munin class that needs to do mysql-specific things
> on those hosts where mysql is installed) reminded me of a feature
> I''ve wanted for some time in puppet, that I don''t think I
ever
> actually shared/asked about:
>
> I''ve been wanting something like require => that only kicksoff
if
> the required thing is actually defined.  So you could do:
>
>  file { "munin.d/mysql-config":
>    require_if_exists => Package[mysql]
>  }
>
you could achieve the same things like this:


 file { "munin.d/mysql-config":
    ...
 }
Package<| title == ''mysql'' |> {
  before => File[''munin.d/mysql-config'']
}

>
> and if Package[mysql] isn''t set up anywhere, nothing happens.
>
> Does this seem reasonable to people?  If so, where should I put it
> in as a feature request?
>
> -Robin
>
> --
> http://singinst.org/ :  Our last, best hope for a fantastic future.
> Lojban (http://www.lojban.org/): The language in which "this parrot
> is dead" is "ti poi spitaki cu morsi", but "this
sentence is false"
> is "na nei".   My personal page:
http://www.digitalkingdom.org/rlp/
>
> --
> 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.
>
>
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