class Chef::GuardInterpreter::ResourceGuardInterpreter
Public Class Methods
new(parent_resource, command, opts)
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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) 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 # Only execute and script resources and use guard attributes. # The command to be executed on them are passed via different attributes. # Script resources use code attribute and execute resources use # command attribute. Moreover script resources are also execute # resources. Here we make sure @command is assigned to the right # attribute by checking the type of the resources. # We need to make sure we check for Script first because any resource # that can get to here is an Execute resource. if @resource.is_a? Chef::Resource::Script block_attributes = @command_opts.merge({ :code => @command }) else block_attributes = @command_opts.merge({ :command => @command }) end # 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 109 def block_from_attributes(attributes) Proc.new do attributes.each_key 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 65 def evaluate_action(action = nil, &block) @resource.instance_eval(&block) run_action = action || @resource.action begin # Coerce to an array to be safe. This could happen with a legacy # resource or something overriding the default_action code in a # subclass. Array(run_action).each { |action_to_run| @resource.run_action(action_to_run) } 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 83 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} unknown for this platform" end if ! resource_class.ancestors.include?(Chef::Resource::Execute) raise ArgumentError, "Specified guard interpreter class #{resource_class} must be a kind of Chef::Resource::Execute resource" end # Duplicate the node below because the new RunContext # overwrites the state of Node instances passed to it. # See https://github.com/chef/chef/issues/3485. empty_events = Chef::EventDispatch::Dispatcher.new anonymous_run_context = Chef::RunContext.new(parent_resource.node.dup, {}, empty_events) interpreter_resource = resource_class.new("Guard resource", anonymous_run_context) interpreter_resource.is_guard_interpreter = true interpreter_resource end
merge_inherited_attributes()
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# File lib/chef/guard_interpreter/resource_guard_interpreter.rb, line 117 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