On Tue, Jan 24, 2012 at 4:34 PM, Walter Heck <walterh...@gmail.com> wrote:
> > I had this thought the other day, but more focused around the higher
> level
> > problem of dependency specification and consumption than Packages in
> > particular.
> Yeah, since that is something that is currently kind of difficult to
> implement properly. I'd welcome a proper way to do this.
>
> > What if you made two functions:
> >
> > 1. declare_capability("foo")
> > This would essentially just create an empty resource, Capability[foo].
> If
> > multiple modules tried to declare the same capability, it would error,
> just
> > like we do today with duplicate resources.
> >
> > 2. require_capability("foo")
> > This would just declare a requirement relationship to Capability[foo].
> If
> > it couldn't find that resource, compilation would fail.
> >
> >
> > Wouldn't something like this solve the general problem? We don't really
> want
> > to just speak about packages, you generally want to be able to express
> > requirements like:
> >
> > * This module requires a working SSH server
> > * This module requires a MySQL database
> >
> > etc etc
> >
> > I've deliberately focused this on doing this with functions as the
> extension
> > point as I think it keeps us focused, even if we decide that in the
> future
> > this should be solved in the metadata layer of a module.
> Hmm, while I can see your point of using functions, I think a more
> "puppety" way of doing this would be to have
>
> require Capability['yadda']
>
> vs
>
> capability{'yadda':
> ensure => present
> }
>
Yeah. I went for functions to try and hide the fact that this is a resource
underneath, but perhaps modeling this more transparently makes sense.
>
> 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()? ;-)
--
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+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/puppet-users?hl=en.
