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# Created by Luke Kanies on 2006-11-07.
# Copyright (c) 2006. All rights reserved.
class Puppet::Util::Feature
attr_reader :path
# Create a new feature test. You have to pass the feature name,
# and it must be unique. You can either provide a block that
# will get executed immediately to determine if the feature
# is present, or you can pass an option to determine it.
# Currently, the only supported option is 'libs' (must be
# passed as a symbol), which will make sure that each lib loads
# successfully.
def add(name, options = {})
method = name.to_s + "?"
raise ArgumentError, "Feature #{name} is already defined" if self.class.respond_to?(method)
if block_given?
begin
result = yield
rescue Exception => detail
warn "Failed to load feature test for #{name}: #{detail}"
result = false
end
@results[name] = result
end
meta_def(method) do
@results[name] = test(name, options) unless @results.include?(name)
@results[name]
end
end
# Create a new feature collection.
def initialize(path)
@path = path
@results = {}
@loader = Puppet::Util::Autoload.new(self, @path)
end
def load
@loader.loadall
end
def method_missing(method, *args)
return super unless method.to_s =~ /\?$/
feature = method.to_s.sub(/\?$/, '')
@loader.load(feature)
respond_to?(method) && self.send(method)
end
# Actually test whether the feature is present. We only want to test when
# someone asks for the feature, so we don't unnecessarily load
# files.
def test(name, options)
return true unless ary = options[:libs]
ary = [ary] unless ary.is_a?(Array)
ary.each do |lib|
return false unless load_library(lib, name)
end
# We loaded all of the required libraries
true
end
private
def load_library(lib, name)
raise ArgumentError, "Libraries must be passed as strings not #{lib.class}" unless lib.is_a?(String)
begin
require lib
rescue SystemExit,NoMemoryError
raise
rescue Exception
Puppet.debug "Failed to load library '#{lib}' for feature '#{name}'"
return false
end
true
end
end
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