On May 9, 2008, at 1:20 PM, Marcin Owsiany wrote:
>
> Hi everyone,
>
> Here's a requirement I'm trying to meet:
>
> No package installation should be attempted before "apt-get update"
> runs. (Because it may need to pick up custom package repositories).
> However I do not want to repeat:
> requires => Exec["apt-get update"]
> every time I create a package instance.
>
> Specifying
> Package { require => Exec["apt-get update"] }
> at the top level does not work when you specify another "require"
> explicitly in some package instances. You would have to either:
>
> 1) repeat the default every time a "require" is set explicitly.
> Obviously, that is error-prone and violates the DRY principle.
>
> 2) use the +> operator instead of => but it seems to work only for
> amending resources of inherited classes?
>
> So currently the only way to have this is to create a define.
>
> However
>
> - I'm reluctant to create one (since I was burnt by
> http://reductivelabs.com/trac/puppet/ticket/446).
>
> - Even though this would probably work, (since #446 is now fixed), I
> still feel that it may be good if puppet natively provided such
> feature, without forcing nearly everyone to create their own, but
> identical "my_package()".
>
>
> The idea would be to create some new syntax, which would work just
> like:
> File { require => blah }
> does, but make the "require" stick, instead of being replaced when you
> specify one explicitly.
>
I do this currently by making a definition for edge cases. I use the
Package default, and when I have a package that requires a certain
situation I use a wrapper definition like:
define special::package(ensure = present, ... ) {
package { $name: ensure => $ensure }
}
Now the require is a metaparam on the define, and all my other
defaults work (I only define parameters that I don't use defaults for.
-Blake
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