# File lib/chef/resource.rb, line 194 def self.dsl_name convert_to_snake_case(name, 'Chef::Resource') end
Look up a subclass by class_name which should be a string that matches `Subclass.name`
# File lib/chef/resource.rb, line 148 def self.find_subclass_by_name(class_name) resource_classes.first {|c| c.name == class_name } end
Set or return the "identity attribute" for this resource class. This is generally going to be the "name attribute" for this resource. In other words, the resource type plus this attribute uniquely identify a given bit of state that chef manages. For a File resource, this would be the path, for a package resource, it will be the package name. This will show up in chef-client's audit records as a searchable field.
# File lib/chef/resource.rb, line 182 def self.identity_attr(attr_name=nil) @identity_attr ||= nil @identity_attr = attr_name if attr_name # If this class doesn't have an identity attr, we'll defer to the superclass: if @identity_attr || !superclass.respond_to?(:identity_attr) @identity_attr else superclass.identity_attr end end
Callback when subclass is defined. Adds subclass to list of subclasses.
# File lib/chef/resource.rb, line 142 def self.inherited(subclass) resource_classes << subclass end
# File lib/chef/resource.rb, line 685 def self.json_create(o) resource = self.new(o["instance_vars"]["@name"]) o["instance_vars"].each do |k,v| resource.instance_variable_set("@#{k}".to_sym, v) end resource end
Each notify entry is a resource/action pair, modeled as an Struct with a resource and action member
# File lib/chef/resource.rb, line 220 def initialize(name, run_context=nil) @name = name @run_context = run_context @noop = nil @before = nil @params = Hash.new @provider = nil @allowed_actions = [ :nothing ] @action = :nothing @updated = false @updated_by_last_action = false @supports = {} @ignore_failure = false @retries = 0 @retry_delay = 2 @not_if = [] @only_if = [] @source_line = nil @elapsed_time = 0 @node = run_context ? deprecated_ivar(run_context.node, :node, :warn) : nil end
# File lib/chef/resource.rb, line 710 def self.platform_map @@platform_map ||= PlatformMap.new end
Resources that want providers namespaced somewhere other than Chef::Provider can set the namespace with provider_base Ex:
class MyResource < Chef::Resource provider_base Chef::Provider::Deploy # ...other stuff end
# File lib/chef/resource.rb, line 705 def self.provider_base(arg=nil) @provider_base ||= arg @provider_base ||= Chef::Provider end
Maps a short_name (and optionally a platform and version) to a Chef::Resource. This allows finer grained per platform resource attributes and the end of overloaded resource definitions (I'm looking at you Chef::Resource::Package) Ex:
class WindowsFile < Chef::Resource provides :file, :on_platforms => ["windows"] # ...other stuff end
TODO: 2011-11-02 schisamo - platform_version support
# File lib/chef/resource.rb, line 725 def self.provides(short_name, opts={}) short_name_sym = short_name if short_name.kind_of?(String) short_name.downcase! short_name.gsub!(/\s/, "_") short_name_sym = short_name.to_sym end if opts.has_key?(:on_platforms) platforms = [opts[:on_platforms]].flatten platforms.each do |p| p = :default if :all == p.to_sym platform_map.set( :platform => p.to_sym, :short_name => short_name_sym, :resource => self ) end else platform_map.set( :short_name => short_name_sym, :resource => self ) end end
Track all subclasses of Resource. This is used so names can be looked up when attempting to deserialize from JSON. (See: json_compat)
# File lib/chef/resource.rb, line 134 def self.resource_classes # Using a class variable here ensures we have one variable to track # subclasses shared by the entire class hierarchy; without this, each # subclass would have its own list of subclasses. @@resource_classes ||= [] end
Returns a resource based on a short_name and a node's platform and version.
short_name<Symbol> |
short_name of the resource (ie :directory) |
node<Chef::Node> |
Node object to look up platform and version in |
<Chef::Resource> |
returns the proper Chef::Resource class |
# File lib/chef/resource.rb, line 773 def self.resource_for_node(short_name, node) begin platform, version = Chef::Platform.find_platform_and_version(node) rescue ArgumentError end resource = resource_for_platform(short_name, platform, version) resource end
Returns a resource based on a short_name anda platform and version.
short_name<Symbol> |
short_name of the resource (ie :directory) |
platform<Symbol,String> |
platform name |
version<String> |
platform version |
<Chef::Resource> |
returns the proper Chef::Resource class |
# File lib/chef/resource.rb, line 760 def self.resource_for_platform(short_name, platform=nil, version=nil) platform_map.get(short_name, platform, version) end
Set or return the list of "state attributes" implemented by the Resource subclass. State attributes are attributes that describe the desired state of the system, such as file permissions or ownership. In general, state attributes are attributes that could be populated by examining the state of the system (e.g., File.stat can tell you the permissions on an existing file). Contrarily, attributes that are not "state attributes" usually modify the way Chef itself behaves, for example by providing additional options for a package manager to use when installing a package.
This list is used by the Chef client auditing system to extract information from resources to describe changes made to the system.
# File lib/chef/resource.rb, line 164 def self.state_attrs(*attr_names) @state_attrs ||= [] @state_attrs = attr_names unless attr_names.empty? # Return *all* state_attrs that this class has, including inherited ones if superclass.respond_to?(:state_attrs) superclass.state_attrs + @state_attrs else @state_attrs end end
# File lib/chef/resource.rb, line 326 def action(arg=nil) if arg action_list = arg.kind_of?(Array) ? arg : [ arg ] action_list = action_list.collect { |a| a.to_sym } action_list.each do |action| validate( { :action => action, }, { :action => { :kind_of => Symbol, :equal_to => @allowed_actions }, } ) end @action = action_list else @action end end
Hook to allow a resource to run specific code after creation
# File lib/chef/resource.rb, line 694 def after_created nil end
as_json does most of the to_json heavy lifted. It exists here in case activesupport is loaded. activesupport will call as_json and skip over to_json. This ensure json is encoded as expected
# File lib/chef/resource.rb, line 490 def as_json(*a) safe_ivars = instance_variables.map { |ivar| ivar.to_sym } - FORBIDDEN_IVARS instance_vars = Hash.new safe_ivars.each do |iv| instance_vars[iv.to_s.sub(/^@/, '')] = instance_variable_get(iv) end { 'json_class' => self.class.name, 'instance_vars' => instance_vars } end
# File lib/chef/resource.rb, line 575 def cookbook_version if cookbook_name run_context.cookbook_collection[cookbook_name] end end
# File lib/chef/resource.rb, line 644 def customize_exception(e) new_exception = e.exception("#{self} (#{defined_at}) had an error: #{e.class.name}: #{e.message}") new_exception.set_backtrace(e.backtrace) new_exception end
# File lib/chef/resource.rb, line 560 def defined_at # The following regexp should match these two sourceline formats: # /some/path/to/file.rb:80:in `wombat_tears' # C:/some/path/to/file.rb:80 in 1`wombat_tears' # extracting the path to the source file and the line number. (file, line_no) = source_line.match(/(.*):(\d+):?.*$/).to_a[1,2] if source_line if cookbook_name && recipe_name && source_line "#{cookbook_name}::#{recipe_name} line #{line_no}" elsif source_line "#{file} line #{line_no}" else "dynamically defined" end end
# File lib/chef/resource.rb, line 430 def delayed_notifications run_context.delayed_notifications(self) end
# File lib/chef/resource.rb, line 386 def epic_fail(arg=nil) ignore_failure(arg) end
# File lib/chef/resource.rb, line 581 def events run_context.events end
Returns the value of the identity attribute, if declared. Falls back to name if no identity attribute is declared.
# File lib/chef/resource.rb, line 254 def identity if identity_attr = self.class.identity_attr send(identity_attr) else name end end
# File lib/chef/resource.rb, line 362 def ignore_failure(arg=nil) set_or_return( :ignore_failure, arg, :kind_of => [ TrueClass, FalseClass ] ) end
# File lib/chef/resource.rb, line 426 def immediate_notifications run_context.immediate_notifications(self) end
# File lib/chef/resource.rb, line 480 def inspect ivars = instance_variables.map { |ivar| ivar.to_sym } - FORBIDDEN_IVARS ivars.inject("<#{to_s}") do |str, ivar| str << " #{ivar}: #{instance_variable_get(ivar).inspect}" end << ">" end
# File lib/chef/resource.rb, line 452 def is(*args) if args.size == 1 args.first else return *args end end
# File lib/chef/resource.rb, line 286 def load_prior_resource begin prior_resource = run_context.resource_collection.lookup(self.to_s) # if we get here, there is a prior resource (otherwise we'd have jumped # to the rescue clause). Chef::Log.warn("Cloning resource attributes for #{self.to_s} from prior resource (CHEF-3694)") Chef::Log.warn("Previous #{prior_resource}: #{prior_resource.source_line}") if prior_resource.source_line Chef::Log.warn("Current #{self}: #{self.source_line}") if self.source_line prior_resource.instance_variables.each do |iv| unless iv.to_sym == :@source_line || iv.to_sym == :@action || iv.to_sym == :@not_if || iv.to_sym == :@only_if self.instance_variable_set(iv, prior_resource.instance_variable_get(iv)) end end true rescue Chef::Exceptions::ResourceNotFound true end end
If an unknown method is invoked, determine whether the enclosing Provider's lexical scope can fulfill the request. E.g. This happens when the Resource's block invokes new_resource.
# File lib/chef/resource.rb, line 278 def method_missing(method_symbol, *args, &block) if enclosing_provider && enclosing_provider.respond_to?(method_symbol) enclosing_provider.send(method_symbol, *args, &block) else raise NoMethodError, "undefined method `#{method_symbol.to_s}' for #{self.class.to_s}" end end
# File lib/chef/resource.rb, line 346 def name(name=nil) if !name.nil? raise ArgumentError, "name must be a string!" unless name.kind_of?(String) @name = name end @name end
# File lib/chef/resource.rb, line 271 def node run_context && run_context.node end
# File lib/chef/resource.rb, line 354 def noop(tf=nil) if !tf.nil? raise ArgumentError, "noop must be true or false!" unless tf == true || tf == false @noop = tf end @noop end
If command is a block, returns false if the block returns true, true if it returns false. ("Do not run this resource if the block is true")
If the command is not a block, executes the command. If it returns a 0 exitstatus, returns false. ("Do not run this resource if the command returns 0")
command<String> |
A a string to execute. |
opts<Hash> |
Options control the execution of the command |
block<Proc> |
A ruby block to run. Ignored if a command is given. |
evaluates to true if the block is false, or if the command returns a non-zero exit status.
evaluates to false if the block is true, or if the command returns a 0 exit status.
# File lib/chef/resource.rb, line 553 def not_if(command=nil, opts={}, &block) if command || block_given? @not_if << Conditional.not_if(command, opts, &block) end @not_if end
Sets up a notification from this resource to the resource specified by resource_spec.
# File lib/chef/resource.rb, line 391 def notifies(action, resource_spec, timing=:delayed) # when using old-style resources(:template => "/foo.txt") style, you # could end up with multiple resources. resources = [ resource_spec ].flatten resources.each do |resource| case timing.to_s when 'delayed' notifies_delayed(action, resource) when 'immediate', 'immediately' notifies_immediately(action, resource) else raise ArgumentError, "invalid timing: #{timing} for notifies(#{action}, #{resources.inspect}, #{timing}) resource #{self} " "Valid timings are: :delayed, :immediate, :immediately" end end true end
# File lib/chef/resource.rb, line 422 def notifies_delayed(action, resource_spec) run_context.notifies_delayed(Notification.new(resource_spec, action, self)) end
# File lib/chef/resource.rb, line 418 def notifies_immediately(action, resource_spec) run_context.notifies_immediately(Notification.new(resource_spec, action, self)) end
If command is a block, returns true if the block returns true, false if it returns false. ("Only run this resource if the block is true")
If the command is not a block, executes the command. If it returns any status other than 0, it returns false (clearly, a 0 status code is true)
command<String> |
A a string to execute. |
opts<Hash> |
Options control the execution of the command |
block<Proc> |
A ruby block to run. Ignored if a command is given. |
evaluates to true if the block is true, or if the command returns 0
evaluates to false if the block is false, or if the command returns a non-zero exit code.
# File lib/chef/resource.rb, line 532 def only_if(command=nil, opts={}, &block) if command || block_given? @only_if << Conditional.only_if(command, opts, &block) end @only_if end
# File lib/chef/resource.rb, line 631 def provider_for_action(action) # leverage new platform => short_name => resource # which requires explicitly setting provider in # resource class if self.provider provider = self.provider.new(self, self.run_context) provider.action = action provider else # fall back to old provider resolution Chef::Platform.provider_for_resource(self, action) end end
Iterates over all immediate and delayed notifications, calling resolve_resource_reference on each in turn, causing them to resolve lazy/forward references.
# File lib/chef/resource.rb, line 413 def resolve_notification_references run_context.immediate_notifications(self).each { |n| n.resolve_resource_reference(run_context.resource_collection) } run_context.delayed_notifications(self).each {|n| n.resolve_resource_reference(run_context.resource_collection) } end
# File lib/chef/resource.rb, line 434 def resources(*args) run_context.resource_collection.find(*args) end
# File lib/chef/resource.rb, line 585 def run_action(action, notification_type=nil, notifying_resource=nil) # reset state in case of multiple actions on the same resource. @elapsed_time = 0 start_time = Time.now events.resource_action_start(self, action, notification_type, notifying_resource) # Try to resolve lazy/forward references in notifications again to handle # the case where the resource was defined lazily (ie. in a ruby_block) resolve_notification_references validate_action(action) if Chef::Config[:verbose_logging] || Chef::Log.level == :debug # This can be noisy Chef::Log.info("Processing #{self} action #{action} (#{defined_at})") end # ensure that we don't leave @updated_by_last_action set to true # on accident updated_by_last_action(false) begin return if should_skip?(action) provider_for_action(action).run_action rescue Exception => e if ignore_failure Chef::Log.error("#{self} (#{defined_at}) had an error: #{e.message}; ignore_failure is set, continuing") events.resource_failed(self, action, e) elsif retries > 0 events.resource_failed_retriable(self, action, retries, e) @retries -= 1 Chef::Log.info("Retrying execution of #{self}, #{retries} attempt(s) left") sleep retry_delay retry else events.resource_failed(self, action, e) raise customize_exception(e) end ensure @elapsed_time = Time.now - start_time events.resource_completed(self) end end
Evaluates not_if and only_if conditionals. Returns a falsey value if any of the conditionals indicate that this resource should be skipped, i.e., if an only_if evaluates to false or a not_if evaluates to true.
If this resource should be skipped, returns the first conditional that "fails" its check. Subsequent conditionals are not evaluated, so in general it's not a good idea to rely on side effects from not_if or only_if commands/blocks being evaluated.
# File lib/chef/resource.rb, line 657 def should_skip?(action) conditionals = only_if + not_if return false if conditionals.empty? conditionals.find do |conditional| if conditional.continue? false else events.resource_skipped(self, action, conditional) Chef::Log.debug("Skipping #{self} due to #{conditional.description}") true end end end
Returns a Hash of attribute => value for the state attributes declared in the resource's class definition.
# File lib/chef/resource.rb, line 245 def state self.class.state_attrs.inject({}) do |state_attrs, attr_name| state_attrs[attr_name] = send(attr_name) state_attrs end end
# File lib/chef/resource.rb, line 438 def subscribes(action, resources, timing=:delayed) resources = [resources].flatten resources.each do |resource| if resource.is_a?(String) resource = Chef::Resource.new(resource, run_context) end if resource.run_context.nil? resource.run_context = run_context end resource.notifies(action, self, timing) end true end
# File lib/chef/resource.rb, line 305 def supports(args={}) if args.any? @supports = args else @supports end end
# File lib/chef/resource.rb, line 508 def to_hash safe_ivars = instance_variables.map { |ivar| ivar.to_sym } - FORBIDDEN_IVARS instance_vars = Hash.new safe_ivars.each do |iv| key = iv.to_s.sub(/^@/,'').to_sym instance_vars[key] = instance_variable_get(iv) end instance_vars end
Serialize this object as a hash
# File lib/chef/resource.rb, line 503 def to_json(*a) results = as_json results.to_json(*a) end
# File lib/chef/resource.rb, line 460 def to_s "#{@resource_name}[#{@name}]" end
# File lib/chef/resource.rb, line 464 def to_text ivars = instance_variables.map { |ivar| ivar.to_sym } - HIDDEN_IVARS text = "# Declared in #{@source_line}\n\n" text << self.class.dsl_name + "(\"#{name}\") do\n" ivars.each do |ivar| if (value = instance_variable_get(ivar)) && !(value.respond_to?(:empty?) && value.empty?) value_string = value.respond_to?(:to_text) ? value.to_text : value.inspect text << " #{ivar.to_s.sub(/^@/,'')} #{value_string}\n" end end [@not_if, @only_if].flatten.each do |conditional| text << " #{conditional.to_text}\n" end text << "end\n" end
# File lib/chef/resource.rb, line 263 def updated=(true_or_false) Chef::Log.warn("Chef::Resource#updated=(true|false) is deprecated. Please call #updated_by_last_action(true|false) instead.") Chef::Log.warn("Called from:") caller[0..3].each {|line| Chef::Log.warn(line)} updated_by_last_action(true_or_false) @updated = true_or_false end
# File lib/chef/resource.rb, line 672 def updated_by_last_action(true_or_false) @updated ||= true_or_false @updated_by_last_action = true_or_false end
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