Class: Chef::Resource

Inherits:
Object show all
Extended by:
Mixin::ConvertToClassName
Includes:
Mixin::CheckHelper, Mixin::ConvertToClassName, Mixin::Deprecation, Mixin::Language, Mixin::ParamsValidate
Defined in:
lib/chef/resource.rb,
lib/chef/resource/csh.rb,
lib/chef/resource/env.rb,
lib/chef/resource/git.rb,
lib/chef/resource/log.rb,
lib/chef/resource/scm.rb,
lib/chef/resource/bash.rb,
lib/chef/resource/cron.rb,
lib/chef/resource/file.rb,
lib/chef/resource/link.rb,
lib/chef/resource/ohai.rb,
lib/chef/resource/perl.rb,
lib/chef/resource/ruby.rb,
lib/chef/resource/user.rb,
lib/chef/resource/group.rb,
lib/chef/resource/mdadm.rb,
lib/chef/resource/mount.rb,
lib/chef/resource/route.rb,
lib/chef/resource/deploy.rb,
lib/chef/resource/python.rb,
lib/chef/resource/script.rb,
lib/chef/resource/execute.rb,
lib/chef/resource/package.rb,
lib/chef/resource/service.rb,
lib/chef/resource/chef_gem.rb,
lib/chef/resource/erl_call.rb,
lib/chef/resource/ifconfig.rb,
lib/chef/resource/template.rb,
lib/chef/resource/directory.rb,
lib/chef/resource/breakpoint.rb,
lib/chef/resource/ruby_block.rb,
lib/chef/resource/subversion.rb,
lib/chef/resource/apt_package.rb,
lib/chef/resource/conditional.rb,
lib/chef/resource/gem_package.rb,
lib/chef/resource/ips_package.rb,
lib/chef/resource/remote_file.rb,
lib/chef/resource/rpm_package.rb,
lib/chef/resource/yum_package.rb,
lib/chef/resource/dpkg_package.rb,
lib/chef/resource/http_request.rb,
lib/chef/resource_platform_map.rb,
lib/chef/resource/cookbook_file.rb,
lib/chef/resource/pacman_package.rb,
lib/chef/resource/deploy_revision.rb,
lib/chef/resource/freebsd_package.rb,
lib/chef/resource/portage_package.rb,
lib/chef/resource/smartos_package.rb,
lib/chef/resource/solaris_package.rb,
lib/chef/resource/macports_package.rb,
lib/chef/resource/remote_directory.rb,
lib/chef/resource/timestamped_deploy.rb,
lib/chef/resource/easy_install_package.rb

Defined Under Namespace

Classes: AptPackage, Bash, Breakpoint, ChefGem, Conditional, CookbookFile, Cron, Csh, Deploy, DeployBranch, DeployRevision, Directory, DpkgPackage, EasyInstallPackage, Env, ErlCall, Execute, File, FreebsdPackage, GemPackage, Git, Group, HttpRequest, Ifconfig, IpsPackage, Link, Log, MacportsPackage, Mdadm, Mount, Notification, Ohai, Package, PacmanPackage, Perl, PlatformMap, PortagePackage, Python, RemoteDirectory, RemoteFile, Route, RpmPackage, Ruby, RubyBlock, Scm, Script, Service, SmartOSPackage, SolarisPackage, Subversion, Template, TimestampedDeploy, User, YumPackage

Constant Summary collapse

FORBIDDEN_IVARS = 
[:@run_context, :@node, :@not_if, :@only_if, :@enclosing_provider]
HIDDEN_IVARS = 
[:@allowed_actions, :@resource_name, :@source_line, :@run_context, :@name, :@node, :@not_if, :@only_if, :@elapsed_time, :@enclosing_provider]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Mixin::ConvertToClassName

convert_to_class_name, convert_to_snake_case, filename_to_qualified_string, snake_case_basename

Methods included from Mixin::Deprecation

#deprecated_ivar

Methods included from Mixin::Language

#data_bag, #data_bag_item, #platform?, #platform_family?, #search, #value_for_platform, #value_for_platform_family

Methods included from Mixin::ParamsValidate

#set_or_return, #validate

Methods included from Mixin::CheckHelper

#set_if_args

Constructor Details

#initialize(name, run_context = nil) ⇒ Resource

Each notify entry is a resource/action pair, modeled as an Struct with a #resource and #action member



197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
 
# File 'lib/chef/resource.rb', line 197

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

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_symbol, *args, &block) ⇒ Object

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.



255
256
257
258
259
260
261
 
# File 'lib/chef/resource.rb', line 255

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

Instance Attribute Details

#allowed_actions ⇒ Object

Returns the value of attribute allowed_actions.



177
178
179
 
# File 'lib/chef/resource.rb', line 177

def allowed_actions
  @allowed_actions
end

#cookbook_name ⇒ Object

Returns the value of attribute cookbook_name.



179
180
181
 
# File 'lib/chef/resource.rb', line 179

def cookbook_name
  @cookbook_name
end

#elapsed_time ⇒ Object (readonly)

Returns the value of attribute elapsed_time.



192
193
194
 
# File 'lib/chef/resource.rb', line 192

def elapsed_time
  @elapsed_time
end

#enclosing_provider ⇒ Object

Returns the value of attribute enclosing_provider.



181
182
183
 
# File 'lib/chef/resource.rb', line 181

def enclosing_provider
  @enclosing_provider
end

#not_if_args ⇒ Object (readonly)

Returns the value of attribute not_if_args.



189
190
191
 
# File 'lib/chef/resource.rb', line 189

def not_if_args
  @not_if_args
end

#only_if_args ⇒ Object (readonly)

Returns the value of attribute only_if_args.



190
191
192
 
# File 'lib/chef/resource.rb', line 190

def only_if_args
  @only_if_args
end

#params ⇒ Object

Returns the value of attribute params.



175
176
177
 
# File 'lib/chef/resource.rb', line 175

def params
  @params
end

#provider(arg = nil) ⇒ Object

Returns the value of attribute provider.



176
177
178
 
# File 'lib/chef/resource.rb', line 176

def provider
  @provider
end

#recipe_name ⇒ Object

Returns the value of attribute recipe_name.



180
181
182
 
# File 'lib/chef/resource.rb', line 180

def recipe_name
  @recipe_name
end

#resource_name ⇒ Object (readonly)

Returns the value of attribute resource_name.



188
189
190
 
# File 'lib/chef/resource.rb', line 188

def resource_name
  @resource_name
end

#retries(arg = nil) ⇒ Object

Returns the value of attribute retries.



183
184
185
 
# File 'lib/chef/resource.rb', line 183

def retries
  @retries
end

#retry_delay(arg = nil) ⇒ Object

Returns the value of attribute retry_delay.



184
185
186
 
# File 'lib/chef/resource.rb', line 184

def retry_delay
  @retry_delay
end

#run_context ⇒ Object

Returns the value of attribute run_context.



178
179
180
 
# File 'lib/chef/resource.rb', line 178

def run_context
  @run_context
end

#source_line ⇒ Object

Returns the value of attribute source_line.



182
183
184
 
# File 'lib/chef/resource.rb', line 182

def source_line
  @source_line
end

#updated ⇒ Object

Returns the value of attribute updated.



186
187
188
 
# File 'lib/chef/resource.rb', line 186

def updated
  @updated
end

Class Method Details

.attribute(attr_name, validation_opts = {}) ⇒ Object 



687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
 
# File 'lib/chef/resource.rb', line 687

def self.attribute(attr_name, validation_opts={})
  # This atrocity is the only way to support 1.8 and 1.9 at the same time
  # When you're ready to drop 1.8 support, do this:
  # define_method attr_name.to_sym do |arg=nil|
  # etc.
  shim_method=<<-SHIM
  def #{attr_name}(arg=nil)
    _set_or_return_#{attr_name}(arg)
  end
  SHIM
  class_eval(shim_method)

  define_method("_set_or_return_#{attr_name.to_s}".to_sym) do |arg|
    set_or_return(attr_name.to_sym, arg, validation_opts)
  end
end

.build_from_file(cookbook_name, filename, run_context) ⇒ Object 



704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
 
# File 'lib/chef/resource.rb', line 704

def self.build_from_file(cookbook_name, filename, run_context)
  rname = filename_to_qualified_string(cookbook_name, filename)

  # Add log entry if we override an existing light-weight resource.
  class_name = convert_to_class_name(rname)
  overriding = Chef::Resource.const_defined?(class_name)
  Chef::Log.info("#{class_name} light-weight resource already initialized -- overriding!") if overriding

  new_resource_class = Class.new self do |cls|

    # default initialize method that ensures that when initialize is finally
    # wrapped (see below), super is called in the event that the resource
    # definer does not implement initialize
    def initialize(name, run_context)
      super(name, run_context)
    end

    @actions_to_create = []

    class << cls
      include Chef::Mixin::FromFile

      attr_accessor :run_context
      attr_reader :action_to_set_default

      def node
        self.run_context.node
      end

      def actions_to_create
        @actions_to_create
      end

      define_method(:default_action) do |action_name|
        actions_to_create.push(action_name)
        @action_to_set_default = action_name
      end

      define_method(:actions) do |*action_names|
        actions_to_create.push(*action_names)
      end
    end

    # set the run context in the class instance variable
    cls.run_context = run_context

    # load resource definition from file
    cls.class_from_file(filename)

    # create a new constructor that wraps the old one and adds the actions
    # specified in the DSL
    old_init = instance_method(:initialize)

    define_method(:initialize) do |name, *optional_args|
      args_run_context = optional_args.shift
      @resource_name = rname.to_sym
      old_init.bind(self).call(name, args_run_context)
      @action = self.class.action_to_set_default || @action
      allowed_actions.push(self.class.actions_to_create).flatten!
    end
  end

  # register new class as a Chef::Resource
  class_name = convert_to_class_name(rname)
  Chef::Resource.const_set(class_name, new_resource_class)
  Chef::Log.debug("Loaded contents of #{filename} into a resource named #{rname} defined in Chef::Resource::#{class_name}")

  new_resource_class
end

.dsl_name ⇒ Object 



171
172
173
 
# File 'lib/chef/resource.rb', line 171

def self.dsl_name
  convert_to_snake_case(name, 'Chef::Resource')
end

.identity_attr(attr_name = nil) ⇒ Object

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.



159
160
161
162
163
164
165
166
167
168
169
 
# File 'lib/chef/resource.rb', line 159

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

.json_create(o) ⇒ Object 



672
673
674
675
676
677
678
 
# File 'lib/chef/resource.rb', line 672

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

.platform_map ⇒ Object 



786
787
788
 
# File 'lib/chef/resource.rb', line 786

def self.platform_map
  @@platform_map ||= PlatformMap.new
end

.provider_base(arg = nil) ⇒ Object

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



781
782
783
784
 
# File 'lib/chef/resource.rb', line 781

def self.provider_base(arg=nil)
  @provider_base ||= arg
  @provider_base ||= Chef::Provider
end

.provides(short_name, opts = {}) ⇒ Object

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



801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
 
# File 'lib/chef/resource.rb', line 801

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

.resource_for_node(short_name, node) ⇒ Object

Returns a resource based on a short_name and a node’s platform and version.

Parameters

short_name<Symbol>

short_name of the resource (ie :directory)

node<Chef::Node>

Node object to look up platform and version in

Returns

<Chef::Resource>

returns the proper Chef::Resource class



849
850
851
852
853
854
855
856
 
# File 'lib/chef/resource.rb', line 849

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

.resource_for_platform(short_name, platform = nil, version = nil) ⇒ Object

Returns a resource based on a short_name anda platform and version.

Parameters

short_name<Symbol>

short_name of the resource (ie :directory)

platform<Symbol,String>

platform name

version<String>

platform version

Returns

<Chef::Resource>

returns the proper Chef::Resource class



836
837
838
 
# File 'lib/chef/resource.rb', line 836

def self.resource_for_platform(short_name, platform=nil, version=nil)
  platform_map.get(short_name, platform, version)
end

.state_attrs(*attr_names) ⇒ Object

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.



141
142
143
144
145
146
147
148
149
150
151
 
# File 'lib/chef/resource.rb', line 141

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

Instance Method Details

#action(arg = nil) ⇒ Object 



299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
 
# File 'lib/chef/resource.rb', line 299

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

#add_notification(action, resources, timing = :delayed) ⇒ Object 



384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
 
# File 'lib/chef/resource.rb', line 384

def add_notification(action, resources, timing=:delayed)
  resources = [resources].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

#after_created ⇒ Object

Hook to allow a resource to run specific code after creation



681
682
683
 
# File 'lib/chef/resource.rb', line 681

def after_created
  nil
end

#as_json(*a) ⇒ Object

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



481
482
483
484
485
486
487
488
489
490
491
 
# File 'lib/chef/resource.rb', line 481

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
  results = {
    'json_class' => self.class.name,
    'instance_vars' => instance_vars
  }
end

#cookbook_version ⇒ Object 



562
563
564
565
566
 
# File 'lib/chef/resource.rb', line 562

def cookbook_version
  if cookbook_name
    run_context.cookbook_collection[cookbook_name]
  end
end

#customize_exception(e) ⇒ Object 



631
632
633
634
635
 
# File 'lib/chef/resource.rb', line 631

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

#defined_at ⇒ Object 



551
552
553
554
555
556
557
558
559
560
 
# File 'lib/chef/resource.rb', line 551

def defined_at
  if cookbook_name && recipe_name && source_line
    "#{cookbook_name}::#{recipe_name} line #{source_line.split(':')[1]}"
  elsif source_line
    file, line_no = source_line.split(':')
    "#{file} line #{line_no}"
  else
    "dynamically defined"
  end
end

#delayed_notifications ⇒ Object 



421
422
423
 
# File 'lib/chef/resource.rb', line 421

def delayed_notifications
  run_context.delayed_notifications(self)
end

#epic_fail(arg = nil) ⇒ Object 



357
358
359
 
# File 'lib/chef/resource.rb', line 357

def epic_fail(arg=nil)
  ignore_failure(arg)
end

#events ⇒ Object 



568
569
570
 
# File 'lib/chef/resource.rb', line 568

def events
  run_context.events
end

#identity ⇒ Object

Returns the value of the identity attribute, if declared. Falls back to #name if no identity attribute is declared.



231
232
233
234
235
236
237
 
# File 'lib/chef/resource.rb', line 231

def identity
  if identity_attr = self.class.identity_attr
    send(identity_attr)
  else
    name
  end
end

#ignore_failure(arg = nil) ⇒ Object 



333
334
335
336
337
338
339
 
# File 'lib/chef/resource.rb', line 333

def ignore_failure(arg=nil)
  set_or_return(
    :ignore_failure,
    arg,
    :kind_of => [ TrueClass, FalseClass ]
  )
end

#immediate_notifications ⇒ Object 



417
418
419
 
# File 'lib/chef/resource.rb', line 417

def immediate_notifications
  run_context.immediate_notifications(self)
end

#inspect ⇒ Object 



471
472
473
474
475
476
 
# File 'lib/chef/resource.rb', line 471

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

#is(*args) ⇒ Object 



443
444
445
446
447
448
449
 
# File 'lib/chef/resource.rb', line 443

def is(*args)
  if args.size == 1
    args.first
  else
    return *args
  end
end

#load_prior_resource ⇒ Object 



263
264
265
266
267
268
269
270
271
272
273
274
275
276
 
# File 'lib/chef/resource.rb', line 263

def load_prior_resource
  begin
    prior_resource = run_context.resource_collection.lookup(self.to_s)
    Chef::Log.debug("Setting #{self.to_s} to the state of the prior #{self.to_s}")
    prior_resource.instance_variables.each do |iv|
      unless iv.to_sym == :@source_line || iv.to_sym == :@action
        self.instance_variable_set(iv, prior_resource.instance_variable_get(iv))
      end
    end
    true
  rescue Chef::Exceptions::ResourceNotFound => e
    true
  end
end

#name(name = nil) ⇒ Object 



319
320
321
322
323
324
 
# File 'lib/chef/resource.rb', line 319

def name(name=nil)
  set_if_args(@name, name) do
    raise ArgumentError, "name must be a string!" unless name.kind_of?(String)
    @name = name
  end
end

#node ⇒ Object 



248
249
250
 
# File 'lib/chef/resource.rb', line 248

def node
  run_context && run_context.node
end

#noop(tf = nil) ⇒ Object 



326
327
328
329
330
331
 
# File 'lib/chef/resource.rb', line 326

def noop(tf=nil)
  set_if_args(@noop, tf) do
    raise ArgumentError, "noop must be true or false!" unless tf == true || tf == false
    @noop = tf
  end
end

#not_if(command = nil, opts = {}, &block) ⇒ Object

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”)

Parameters

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.

Evaluation

  • 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.



544
545
546
547
548
549
 
# File 'lib/chef/resource.rb', line 544

def not_if(command=nil, opts={}, &block)
  if command || block_given?
    @not_if << Conditional.not_if(command, opts, &block)
  end
  @not_if
end

#notifies(*args) ⇒ Object 



361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
 
# File 'lib/chef/resource.rb', line 361

def notifies(*args)
  unless ( args.size > 0 && args.size < 4)
    raise ArgumentError, "Wrong number of arguments for notifies: should be 1-3 arguments, you gave #{args.inspect}"
  end

  if args.size > 1 # notifies(:action, resource) OR notifies(:action, resource, :immediately)
    add_notification(*args)
  else
    # This syntax is so weird. surely people will just give us one hash?
    notifications = args.flatten
    notifications.each do |resources_notifications|
      resources_notifications.each do |resource, notification|
        action, timing = notification[0], notification[1]
        Chef::Log.debug "Adding notification from resource #{self} to `#{resource.inspect}' => `#{notification.inspect}'"
        add_notification(action, resource, timing)
      end
    end
  end
rescue NoMethodError
  Chef::Log.fatal("Error processing notifies(#{args.inspect}) on #{self}")
  raise
end

#notifies_delayed(action, resource_spec) ⇒ Object 



413
414
415
 
# File 'lib/chef/resource.rb', line 413

def notifies_delayed(action, resource_spec)
  run_context.notifies_delayed(Notification.new(resource_spec, action, self))
end

#notifies_immediately(action, resource_spec) ⇒ Object 



409
410
411
 
# File 'lib/chef/resource.rb', line 409

def notifies_immediately(action, resource_spec)
  run_context.notifies_immediately(Notification.new(resource_spec, action, self))
end

#only_if(command = nil, opts = {}, &block) ⇒ Object

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)

Parameters

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.

Evaluation

  • 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.



523
524
525
526
527
528
 
# File 'lib/chef/resource.rb', line 523

def only_if(command=nil, opts={}, &block)
  if command || block_given?
    @only_if << Conditional.only_if(command, opts, &block)
  end
  @only_if
end

#provider_for_action(action) ⇒ Object 



618
619
620
621
622
623
624
625
626
627
628
629
 
# File 'lib/chef/resource.rb', line 618

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

#resolve_notification_references ⇒ Object

Iterates over all immediate and delayed notifications, calling resolve_resource_reference on each in turn, causing them to resolve lazy/forward references.



404
405
406
407
 
# File 'lib/chef/resource.rb', line 404

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

#resources(*args) ⇒ Object 



425
426
427
 
# File 'lib/chef/resource.rb', line 425

def resources(*args)
  run_context.resource_collection.find(*args)
end

#run_action(action, notification_type = nil, notifying_resource = nil) ⇒ Object 



572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
 
# File 'lib/chef/resource.rb', line 572

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

#should_skip?(action) ⇒ Boolean

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.

Returns:

  • (Boolean) 


644
645
646
647
648
649
650
651
652
653
654
655
656
657
 
# File 'lib/chef/resource.rb', line 644

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

#state ⇒ Object

Returns a Hash of attribute => value for the state attributes declared in the resource’s class definition.



222
223
224
225
226
227
 
# File 'lib/chef/resource.rb', line 222

def state
  self.class.state_attrs.inject({}) do |state_attrs, attr_name|
    state_attrs[attr_name] = send(attr_name)
    state_attrs
  end
end

#subscribes(action, resources, timing = :delayed) ⇒ Object 



429
430
431
432
433
434
435
436
437
438
439
440
441
 
# File 'lib/chef/resource.rb', line 429

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.add_notification(action, self, timing)
  end
  true
end

#supports(args = {}) ⇒ Object 



278
279
280
281
282
283
284
 
# File 'lib/chef/resource.rb', line 278

def supports(args={})
  if args.any?
    @supports = args
  else
    @supports
  end
end

#to_hash ⇒ Object 



499
500
501
502
503
504
505
506
507
 
# File 'lib/chef/resource.rb', line 499

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

#to_json(*a) ⇒ Object

Serialize this object as a hash



494
495
496
497
 
# File 'lib/chef/resource.rb', line 494

def to_json(*a)
  results = as_json
  results.to_json(*a)
end

#to_s ⇒ Object 



451
452
453
 
# File 'lib/chef/resource.rb', line 451

def to_s
  "#{@resource_name}[#{@name}]"
end

#to_text ⇒ Object 



455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
 
# File 'lib/chef/resource.rb', line 455

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

#updated? ⇒ Boolean

Returns:

  • (Boolean) 


668
669
670
 
# File 'lib/chef/resource.rb', line 668

def updated?
  updated
end

#updated_by_last_action(true_or_false) ⇒ Object 



659
660
661
662
 
# File 'lib/chef/resource.rb', line 659

def updated_by_last_action(true_or_false)
  @updated ||= true_or_false
  @updated_by_last_action = true_or_false
end

#updated_by_last_action? ⇒ Boolean

Returns:

  • (Boolean) 


664
665
666
 
# File 'lib/chef/resource.rb', line 664

def updated_by_last_action?
  @updated_by_last_action
end

#validate_action(action) ⇒ Object

Raises:

  • (ArgumentError) 


614
615
616
 
# File 'lib/chef/resource.rb', line 614

def validate_action(action)
  raise ArgumentError, "nil is not a valid action for resource #{self}" if action.nil?
end