[Puppet Users] Custom type obligatory field?

[Jakov Sosic]

Hi.

I've been trying to develop a module for managing Cobbler from puppet.
So, I need a custom type - cobblerdistro, which will fetch ISO from
http, unpack it at desired destination and register distro with Cobbler.

I have one issue with ensure => absent situation.

First of all, here is my type:

<code>

# cat type/cobblerdistro.rb
Puppet::Type.newtype(:cobblerdistro) do
@doc = "Manages the Cobbler distros.

A typical rule will look like this:

distro {'CentOS-6.3-x86_64':
  ensure  => present,
  arch    => 'x86_64',
  isolink =>
'http://mi.mirror.garr.it/mirrors/CentOS/6.3/isos/x86_64/CentOS-6.3-x86_64-bin-DVD1.iso',
}

This rule would ensure that the kernel swappiness setting be set to '20'"

  desc "The cobbler distro type"

  ensurable

  newparam(:name) do
    isnamevar
    desc "The name of the distro, that will create subdir in $distro"
  end

  newparam(:arch) do
    desc "The architecture of distro (x86_64 or i386)."
    newvalues(:x86_64, :i386)
    munge do |value| # fix values
      case value
      when :amd64
        :x86_64
      when :i86pc
        :i386
      else
        super
      end
    end
  end

  newparam(:isolink) do
    desc "The link of the distro ISO image."
    validate do |value|
      unless value =~ /^http:.*iso/
        raise ArgumentError, "%s is not a valid link to ISO image." % value
      end
    end
  end

  newparam(:destdir) do
    desc "The link of the distro ISO image."
    validate do |value|
        unless Pathname.new(value).absolute?
            raise ArgumentError, "Full pathname must be set"
        end
    end
  end
end

</code>

Now, how can I ensure that destdir param is obligatory? I don't want my
provider to run at all, if destdir is not specified in the resource.

So, for example, I want to spew error if user writes this code:
  cobblerdistro {'CentOS-6.3-x86_64':
    ensure  => absent,
  }

and want this to be a minimal code snippet

  cobblerdistro {'CentOS-6.3-x86_64':
    ensure  => absent,
    destdir => '/distro',
  }

Otherwise, I have to hardcode the destination directory for distribution
releases and I don't want to do that :(

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