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|
#
# Author:: Adam Jacob (<adam@opscode.com>)
# Author:: Christopher Walters (<cw@opscode.com>)
# Copyright:: Copyright (c) 2008, 2009 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'chef/mixin/from_file'
require 'chef/mixin/convert_to_class_name'
require 'chef/mixin/recipe_definition_dsl_core'
class Chef
class Provider
include Chef::Mixin::RecipeDefinitionDSLCore
attr_accessor :new_resource, :current_resource, :run_context
def initialize(new_resource, run_context)
@new_resource = new_resource
@current_resource = nil
@run_context = run_context
end
def node
run_context && run_context.node
end
# Used by providers supporting embedded recipes
def resource_collection
run_context && run_context.resource_collection
end
def cookbook_name
new_resource.cookbook_name
end
def load_current_resource
raise Chef::Exceptions::Override, "You must override load_current_resource in #{self.to_s}"
end
def action_nothing
Chef::Log.debug("Doing nothing for #{@new_resource.to_s}")
true
end
protected
def recipe_eval(&block)
# This block has new resource definitions within it, which
# essentially makes it an in-line Chef run. Save our current
# run_context and create one anew, so the new Chef run only
# executes the embedded resources.
#
# TODO: timh,cw: 2010-5-14: This means that the resources within
# this block cannot interact with resources outside, e.g.,
# manipulating notifies.
saved_run_context = @run_context
@run_context = @run_context.dup
@run_context.resource_collection = Chef::ResourceCollection.new
instance_eval(&block)
Chef::Runner.new(@run_context).converge
@run_context = saved_run_context
end
public
class << self
include Chef::Mixin::ConvertToClassName
def build_from_file(cookbook_name, filename)
pname = filename_to_qualified_string(cookbook_name, filename)
# Add log entry if we override an existing light-weight provider.
class_name = convert_to_class_name(pname)
overriding = Chef::Provider.const_defined?(class_name)
Chef::Log.info("#{class_name} light-weight provider already initialized -- overriding!") if overriding
new_provider_class = Class.new self do |cls|
def load_current_resource
# silence Chef::Exceptions::Override exception
end
class << cls
include Chef::Mixin::FromFile
# setup DSL's shortcut methods
def action(name, &block)
define_method("action_#{name.to_s}") do
instance_eval(&block)
end
end
end
# load provider definition from file
cls.class_from_file(filename)
end
# register new class as a Chef::Provider
pname = filename_to_qualified_string(cookbook_name, filename)
class_name = convert_to_class_name(pname)
Chef::Provider.const_set(class_name, new_provider_class)
Chef::Log.debug("Loaded contents of #{filename} into a provider named #{pname} defined in Chef::Provider::#{class_name}")
new_provider_class
end
end
end
end
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