Class: Chef::Resource

Inherits:
Object show all
Extended by:
Mixin::ConvertToClassName
Includes:
DSL::DataQuery, DSL::PlatformIntrospection, DSL::RegistryHelper, Mixin::ConvertToClassName, Mixin::Deprecation, 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/batch.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/lwrp_base.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/bff_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/registry_key.rb,
lib/chef/resource_platform_map.rb,
lib/chef/resource/cookbook_file.rb,
lib/chef/resource/pacman_package.rb,
lib/chef/resource/windows_script.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/powershell_script.rb,
lib/chef/resource/timestamped_deploy.rb,
lib/chef/resource/easy_install_package.rb,
lib/chef/resource/conditional_action_not_nothing.rb

Defined Under Namespace

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

remove in Chef 12

Backwards compatability

Chef::Resource::SmartosPackage

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 DSL::RegistryHelper

#registry_data_exists?, #registry_get_subkeys, #registry_get_values, #registry_has_subkeys?, #registry_key_exists?, #registry_value_exists?

Methods included from DSL::PlatformIntrospection

#platform?, #platform_family?, #value_for_platform, #value_for_platform_family

Methods included from Mixin::ParamsValidate

#lazy, #set_or_return, #validate

Methods included from DSL::DataQuery

#data_bag, #data_bag_item, #search

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



232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
 
# File 'lib/chef/resource.rb', line 232

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.



290
291
292
293
294
295
296
 
# File 'lib/chef/resource.rb', line 290

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.



212
213
214
 
# File 'lib/chef/resource.rb', line 212

def allowed_actions
  @allowed_actions
end

#cookbook_name ⇒ Object

Returns the value of attribute cookbook_name.



214
215
216
 
# File 'lib/chef/resource.rb', line 214

def cookbook_name
  @cookbook_name
end

#elapsed_time ⇒ Object (readonly)

Returns the value of attribute elapsed_time.



227
228
229
 
# File 'lib/chef/resource.rb', line 227

def elapsed_time
  @elapsed_time
end

#enclosing_provider ⇒ Object

Returns the value of attribute enclosing_provider.



216
217
218
 
# File 'lib/chef/resource.rb', line 216

def enclosing_provider
  @enclosing_provider
end

#not_if_args ⇒ Object (readonly)

Returns the value of attribute not_if_args.



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

def not_if_args
  @not_if_args
end

#only_if_args ⇒ Object (readonly)

Returns the value of attribute only_if_args.



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

def only_if_args
  @only_if_args
end

#params ⇒ Object

Returns the value of attribute params.



210
211
212
 
# File 'lib/chef/resource.rb', line 210

def params
  @params
end

#provider(arg = nil) ⇒ Object

Returns the value of attribute provider.



211
212
213
 
# File 'lib/chef/resource.rb', line 211

def provider
  @provider
end

#recipe_name ⇒ Object

Returns the value of attribute recipe_name.



215
216
217
 
# File 'lib/chef/resource.rb', line 215

def recipe_name
  @recipe_name
end

#resource_name ⇒ Object (readonly)

Returns the value of attribute resource_name.



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

def resource_name
  @resource_name
end

#retries(arg = nil) ⇒ Object

Returns the value of attribute retries.



218
219
220
 
# File 'lib/chef/resource.rb', line 218

def retries
  @retries
end

#retry_delay(arg = nil) ⇒ Object

Returns the value of attribute retry_delay.



219
220
221
 
# File 'lib/chef/resource.rb', line 219

def retry_delay
  @retry_delay
end

#run_context ⇒ Object

Returns the value of attribute run_context.



213
214
215
 
# File 'lib/chef/resource.rb', line 213

def run_context
  @run_context
end

#source_line ⇒ Object

Returns the value of attribute source_line.



217
218
219
 
# File 'lib/chef/resource.rb', line 217

def source_line
  @source_line
end

#updated ⇒ Object

Returns the value of attribute updated.



221
222
223
 
# File 'lib/chef/resource.rb', line 221

def updated
  @updated
end

Class Method Details

.dsl_name ⇒ Object 



206
207
208
 
# File 'lib/chef/resource.rb', line 206

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

.find_subclass_by_name(class_name) ⇒ Object

Look up a subclass by class_name which should be a string that matches ‘Subclass.name`



160
161
162
 
# File 'lib/chef/resource.rb', line 160

def self.find_subclass_by_name(class_name)
  resource_classes.first {|c| c.name == class_name }
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.



194
195
196
197
198
199
200
201
202
203
204
 
# File 'lib/chef/resource.rb', line 194

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

.inherited(subclass) ⇒ Object

Callback when subclass is defined. Adds subclass to list of subclasses.



154
155
156
 
# File 'lib/chef/resource.rb', line 154

def self.inherited(subclass)
  resource_classes << subclass
end

.json_create(o) ⇒ Object 



706
707
708
709
710
711
712
 
# File 'lib/chef/resource.rb', line 706

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 



731
732
733
 
# File 'lib/chef/resource.rb', line 731

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



726
727
728
729
 
# File 'lib/chef/resource.rb', line 726

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



746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
 
# File 'lib/chef/resource.rb', line 746

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_classes ⇒ Object

Track all subclasses of Resource. This is used so names can be looked up when attempting to deserialize from JSON. (See: json_compat)



146
147
148
149
150
151
 
# File 'lib/chef/resource.rb', line 146

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

.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



794
795
796
797
798
799
800
801
 
# File 'lib/chef/resource.rb', line 794

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



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

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.



176
177
178
179
180
181
182
183
184
185
186
 
# File 'lib/chef/resource.rb', line 176

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

.strict_const_defined?(const) ⇒ Boolean

Returns:

  • (Boolean) 


135
136
137
 
# File 'lib/chef/resource.rb', line 135

def self.strict_const_defined?(const)
  const_defined?(const)
end

Instance Method Details

#action(arg = nil) ⇒ Object 



338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
 
# File 'lib/chef/resource.rb', line 338

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

#after_created ⇒ Object

Hook to allow a resource to run specific code after creation



715
716
717
 
# File 'lib/chef/resource.rb', line 715

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



509
510
511
512
513
514
515
516
517
518
519
 
# File 'lib/chef/resource.rb', line 509

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

#cookbook_version ⇒ Object 



594
595
596
597
598
 
# File 'lib/chef/resource.rb', line 594

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

#customize_exception(e) ⇒ Object 



663
664
665
666
667
 
# File 'lib/chef/resource.rb', line 663

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 



579
580
581
582
583
584
585
586
587
588
589
590
591
592
 
# File 'lib/chef/resource.rb', line 579

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

#delayed_notifications ⇒ Object 



445
446
447
 
# File 'lib/chef/resource.rb', line 445

def delayed_notifications
  run_context.delayed_notifications(self)
end

#epic_fail(arg = nil) ⇒ Object 



398
399
400
 
# File 'lib/chef/resource.rb', line 398

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

#events ⇒ Object 



600
601
602
 
# File 'lib/chef/resource.rb', line 600

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.



266
267
268
269
270
271
272
 
# File 'lib/chef/resource.rb', line 266

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

#ignore_failure(arg = nil) ⇒ Object 



374
375
376
377
378
379
380
 
# File 'lib/chef/resource.rb', line 374

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

#immediate_notifications ⇒ Object 



441
442
443
 
# File 'lib/chef/resource.rb', line 441

def immediate_notifications
  run_context.immediate_notifications(self)
end

#inspect ⇒ Object 



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

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 



471
472
473
474
475
476
477
 
# File 'lib/chef/resource.rb', line 471

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

#load_prior_resource ⇒ Object 



298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
 
# File 'lib/chef/resource.rb', line 298

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

#name(name = nil) ⇒ Object 



358
359
360
361
362
363
364
 
# File 'lib/chef/resource.rb', line 358

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

#node ⇒ Object 



283
284
285
 
# File 'lib/chef/resource.rb', line 283

def node
  run_context && run_context.node
end

#noop(tf = nil) ⇒ Object 



366
367
368
369
370
371
372
 
# File 'lib/chef/resource.rb', line 366

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

#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.



572
573
574
575
576
577
 
# File 'lib/chef/resource.rb', line 572

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

#notifies(action, resource_spec, timing = :delayed) ⇒ Object

Sets up a notification from this resource to the resource specified by resource_spec.



403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
 
# File 'lib/chef/resource.rb', line 403

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|

    validate_resource_spec!(resource_spec)

    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

#notifies_delayed(action, resource_spec) ⇒ Object 



437
438
439
 
# File 'lib/chef/resource.rb', line 437

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

#notifies_immediately(action, resource_spec) ⇒ Object 



433
434
435
 
# File 'lib/chef/resource.rb', line 433

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.



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

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 



650
651
652
653
654
655
656
657
658
659
660
661
 
# File 'lib/chef/resource.rb', line 650

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.



428
429
430
431
 
# File 'lib/chef/resource.rb', line 428

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 



449
450
451
 
# File 'lib/chef/resource.rb', line 449

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

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



604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
 
# File 'lib/chef/resource.rb', line 604

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.

Also skips conditional checking when the action is :nothing

Returns:

  • (Boolean) 


678
679
680
681
682
683
684
685
686
687
688
689
690
691
 
# File 'lib/chef/resource.rb', line 678

def should_skip?(action)
  conditional_action = ConditionalActionNotNothing.new(action)

  conditionals = [ conditional_action ] + only_if + not_if
  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.



257
258
259
260
261
262
 
# File 'lib/chef/resource.rb', line 257

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 



453
454
455
456
457
458
459
460
461
462
463
464
465
 
# File 'lib/chef/resource.rb', line 453

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

#supports(args = {}) ⇒ Object 



317
318
319
320
321
322
323
 
# File 'lib/chef/resource.rb', line 317

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

#to_hash ⇒ Object 



527
528
529
530
531
532
533
534
535
 
# File 'lib/chef/resource.rb', line 527

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



522
523
524
525
 
# File 'lib/chef/resource.rb', line 522

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

#to_s ⇒ Object 



479
480
481
 
# File 'lib/chef/resource.rb', line 479

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

#to_text ⇒ Object 



483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
 
# File 'lib/chef/resource.rb', line 483

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) 


702
703
704
 
# File 'lib/chef/resource.rb', line 702

def updated?
  updated
end

#updated_by_last_action(true_or_false) ⇒ Object 



693
694
695
696
 
# File 'lib/chef/resource.rb', line 693

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) 


698
699
700
 
# File 'lib/chef/resource.rb', line 698

def updated_by_last_action?
  @updated_by_last_action
end

#validate_action(action) ⇒ Object

Raises:

  • (ArgumentError) 


646
647
648
 
# File 'lib/chef/resource.rb', line 646

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

#validate_resource_spec!(resource_spec) ⇒ Object 



467
468
469
 
# File 'lib/chef/resource.rb', line 467

def validate_resource_spec!(resource_spec)
  run_context.resource_collection.validate_lookup_spec!(resource_spec)
end