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#
# Author:: Adam Edwards (<adamed@chef.io>)
# Copyright:: Copyright (c) Chef Software 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_relative "../guard_interpreter"
class Chef
class GuardInterpreter
class ResourceGuardInterpreter
def initialize(parent_resource, command, opts)
@command = command
@opts = opts
@parent_resource = parent_resource
@resource = get_interpreter_resource(parent_resource)
end
# This class used to inherit from DefaultGuardInterpreter and it responds
# to #output, so leave this in for potential backwards compatibility.
def output
nil
end
def evaluate
# Add attributes inherited from the parent class
# to the resource
merge_inherited_attributes
@opts.each do |attribute, value|
@resource.send(attribute, value)
end
# 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 property. 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
@resource.code @command
else
@resource.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 attribute 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)
@resource.class.send(:get_default_attributes).each do |attribute, value|
@resource.send(attribute, value)
end
end
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(@resource.action).each { |action_to_run| @resource.run_action(action_to_run) }
@resource.updated
rescue Mixlib::ShellOut::ShellCommandFailed
nil
end
end
private
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
unless 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
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
inherited_attributes.each do |attribute|
if @parent_resource.respond_to?(attribute) && @resource.respond_to?(attribute)
parent_value = @parent_resource.send(attribute)
@resource.send(attribute, parent_value)
end
end
end
end
end
end
|
