class Chef::GuardInterpreter::ResourceGuardInterpreter
Public Class Methods
new(parent_resource, command, opts, &block)
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Calls superclass method
Chef::GuardInterpreter::DefaultGuardInterpreter.new
# File lib/chef/guard_interpreter/resource_guard_interpreter.rb, line 25 def initialize(parent_resource, command, opts, &block) super(command, opts) @parent_resource = parent_resource @resource = get_interpreter_resource(parent_resource) end
Public Instance Methods
evaluate()
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# File lib/chef/guard_interpreter/resource_guard_interpreter.rb, line 31 def evaluate # Add attributes inherited from the parent class # to the resource merge_inherited_attributes # Script resources have a code attribute, which is # what is used to execute the command, so include # that with attributes specified by caller in opts block_attributes = @command_opts.merge({:code => @command}) # Handles cases like powershell_script where default # attributes are different when used in a guard vs. not. For # powershell_script in particular, this will go away when # the one attribue that causes this changes its default to be # the same after some period to prepare for deprecation if @resource.class.respond_to?(:get_default_attributes) block_attributes = @resource.class.send(:get_default_attributes, @command_opts).merge(block_attributes) end resource_block = block_from_attributes(block_attributes) evaluate_action(nil, &resource_block) end
Protected Instance Methods
block_from_attributes(attributes)
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# File lib/chef/guard_interpreter/resource_guard_interpreter.rb, line 93 def block_from_attributes(attributes) Proc.new do attributes.keys.each do |attribute_name| send(attribute_name, attributes[attribute_name]) if respond_to?(attribute_name) end end end
evaluate_action(action=nil, &block)
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# File lib/chef/guard_interpreter/resource_guard_interpreter.rb, line 56 def evaluate_action(action=nil, &block) @resource.instance_eval(&block) run_action = action || @resource.action begin @resource.run_action(run_action) resource_updated = @resource.updated rescue Mixlib::ShellOut::ShellCommandFailed resource_updated = nil end resource_updated end
get_interpreter_resource(parent_resource)
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# File lib/chef/guard_interpreter/resource_guard_interpreter.rb, line 71 def get_interpreter_resource(parent_resource) if parent_resource.nil? || parent_resource.node.nil? raise ArgumentError, "Node for guard resource parent must not be nil" end resource_class = Chef::Resource.resource_for_node(parent_resource.guard_interpreter, parent_resource.node) if resource_class.nil? raise ArgumentError, "Specified guard_interpreter resource #{parent_resource.guard_interpreter.to_s} unknown for this platform" end if ! resource_class.ancestors.include?(Chef::Resource::Script) raise ArgumentError, "Specified guard interpreter class #{resource_class} must be a kind of Chef::Resource::Script resource" end empty_events = Chef::EventDispatch::Dispatcher.new anonymous_run_context = Chef::RunContext.new(parent_resource.node, {}, empty_events) interpreter_resource = resource_class.new('Guard resource', anonymous_run_context) interpreter_resource end
merge_inherited_attributes()
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# File lib/chef/guard_interpreter/resource_guard_interpreter.rb, line 101 def merge_inherited_attributes inherited_attributes = [] if @parent_resource.class.respond_to?(:guard_inherited_attributes) inherited_attributes = @parent_resource.class.send(:guard_inherited_attributes) end if inherited_attributes && !inherited_attributes.empty? inherited_attributes.each do |attribute| if @parent_resource.respond_to?(attribute) && @resource.respond_to?(attribute) parent_value = @parent_resource.send(attribute) child_value = @resource.send(attribute) if parent_value || child_value @resource.send(attribute, parent_value) end end end end end