On Jan 17, 2009, at 12:31 AM, Scott wrote:
>
> So I need a variable in a child class to be visible to the parent
> class and I'm wondering how I can do that? The docs say "You will
> almost always find that you can avoid resetting variable values using
> the built in conditionals:" but I guess this is one of those cases
> where it just isn't possible:
>
> node default {}
>
> node testserver inherits default {
> include testclasses <- (this is where I need
> $var to be visible)
> }
>
> node test1.example.com inherits testserver {
> $var = "host server name"
> }
>
> As far as I can tell, there's no way to include another node,
> otherwise I could have "test1.example.com" include "testserver"
> instead of inheriting. I can't set a variable in the parent class
> from the child class because variables in puppet can only be set
> once. And, the way it is right now, exactly as it is above, $var
> evaluates to nil because the $var declaration is out of the scope of
> the parent class.
>
> I don't want to include "testclasses" in "test1.example.com" because
> then I'm going to have to include it for every individual "testserver"
> node defeating the whole purpose of inheritance, cluttering up the
> config files and making it easier to make mistakes. So far, this is
> the only way I've been able to get it to work but it's a kludge and
> I'd prefer to avoid it.
>
> I tried something like this as well:
>
> node default {}
>
> node testserver inherits default {
> $var = ["text1", "text2"]
> }
>
> node test1.example.com inherits testserver {
> $var += ["text3"]
> }
>
> but the parameter of the puppet type I'm trying to set with $var
> (nagios_host: hostgroups) doesn't accept arrays. So if a child class
> can append to an array in a parent class, is there a way to get the
> string version of an array with all the elements concatenated together
> with a "," in between each element? Either that or is there a way I
> can get the "hostgroups" parameter in the "nagios_host" type to accept
> arrays?
>
> I feel like I've got to be missing something here. Thanks.
The only real way to do this is to use an external nodes tool. I've
attached a simple script that serves node infromation out of YAML
files; it isn't awesome but it'll do what you want, anyway.
--
All power corrupts, but we need the electricity.
-- Unknown
---------------------------------------------------------------------
Luke Kanies | http://reductivelabs.com | http://madstop.com
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#!/usr/bin/ruby
require 'yaml'
BASEDIR = Dir.chdir(File.dirname(__FILE__) + "/..") { Dir.getwd }
YAMLDIR = File.join(BASEDIR, "yaml")
# Read in a pure yaml representation of our node.
def read_node(node)
nodefile = File.join(YAMLDIR, "#{node}.yaml")
if FileTest.exist?(nodefile)
return YAML.load_file(nodefile)
else
raise "Could not find information for %s" % node
end
end
node = ARGV[0]
info = read_node(node)
# Iterate over any provided parents, merging in there information.
parents_seen = []
while parent = info["parent"]
raise "Found inheritance loop with parent %s" % parent if parents_seen.include?(parent)
parents_seen << parent
info.delete("parent")
parent_info = read_node(parent)
# Include any parent classes in our list.
if pclasses = parent_info["classes"]
info["classes"] += pclasses
info["classes"].uniq!
end
# And inherit parameters from our parent, while preferring our own values.
if pparams = parent_info["parameters"]
# When using Hash#merge, the hash being merged in wins, and we
# want the subnode parameters to be the parent node parameters.
info["parameters"] = pparams.merge(info["parameters"])
end
# Copy over any parent node name.
if pparent = parent_info["parent"]
info["parent"] = pparent
end
end
puts YAML.dump(info)
