Class: Chef::Resource

Inherits:
Object
  • Object
show all
Extended by:
Mixin::ConvertToClassName, Mixin::Provides
Includes:
DSL::DataQuery, DSL::RebootPending, DSL::RegistryHelper, DSL::Universal, Mixin::ConvertToClassName, Mixin::Deprecation, Mixin::Properties
Defined in:
lib/chef/resource.rb,
lib/chef/resource/csh.rb,
lib/chef/resource/env.rb,
lib/chef/resource/git.rb,
lib/chef/resource/ksh.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/reboot.rb,
lib/chef/resource/script.rb,
lib/chef/resource/execute.rb,
lib/chef/resource/launchd.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/apt_update.rb,
lib/chef/resource/breakpoint.rb,
lib/chef/resource/dsc_script.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/cab_package.rb,
lib/chef/resource/conditional.rb,
lib/chef/resource/dnf_package.rb,
lib/chef/resource/gem_package.rb,
lib/chef/resource/ips_package.rb,
lib/chef/resource/msu_package.rb,
lib/chef/resource/osx_profile.rb,
lib/chef/resource/remote_file.rb,
lib/chef/resource/rpm_package.rb,
lib/chef/resource/yum_package.rb,
lib/chef/resource/action_class.rb,
lib/chef/resource/dpkg_package.rb,
lib/chef/resource/dsc_resource.rb,
lib/chef/resource/http_request.rb,
lib/chef/resource/registry_key.rb,
lib/chef/resource/systemd_unit.rb,
lib/chef/resource/user/pw_user.rb,
lib/chef/resource/windows_task.rb,
lib/chef/resource/cookbook_file.rb,
lib/chef/resource/user/aix_user.rb,
lib/chef/resource/apt_repository.rb,
lib/chef/resource/macosx_service.rb,
lib/chef/resource/pacman_package.rb,
lib/chef/resource/user/dscl_user.rb,
lib/chef/resource/windows_script.rb,
lib/chef/resource/yum_repository.rb,
lib/chef/resource/zypper_package.rb,
lib/chef/resource/deploy_revision.rb,
lib/chef/resource/freebsd_package.rb,
lib/chef/resource/openbsd_package.rb,
lib/chef/resource/paludis_package.rb,
lib/chef/resource/portage_package.rb,
lib/chef/resource/smartos_package.rb,
lib/chef/resource/solaris_package.rb,
lib/chef/resource/user/linux_user.rb,
lib/chef/resource/windows_package.rb,
lib/chef/resource/windows_service.rb,
lib/chef/resource/homebrew_package.rb,
lib/chef/resource/macports_package.rb,
lib/chef/resource/remote_directory.rb,
lib/chef/resource/file/verification.rb,
lib/chef/resource/powershell_script.rb,
lib/chef/resource/user/solaris_user.rb,
lib/chef/resource/user/windows_user.rb,
lib/chef/resource/chocolatey_package.rb,
lib/chef/resource/powershell_package.rb,
lib/chef/resource/timestamped_deploy.rb,
lib/chef/resource/resource_notification.rb,
lib/chef/resource/whyrun_safe_ruby_block.rb,
lib/chef/resource/conditional_action_not_nothing.rb,
lib/chef/resource/file/verification/systemd_unit.rb

Defined Under Namespace

Classes: ActionClass, AptPackage, AptRepository, AptUpdate, Bash, Batch, BffPackage, Breakpoint, CabPackage, ChefGem, ChocolateyPackage, Conditional, ConditionalActionNotNothing, CookbookFile, Cron, Csh, Deploy, DeployBranch, DeployRevision, Directory, DnfPackage, DpkgPackage, DscResource, DscScript, Env, ErlCall, Execute, File, FreebsdPackage, GemPackage, Git, Group, HomebrewPackage, HttpRequest, Ifconfig, IpsPackage, Ksh, LWRPBase, Launchd, Link, Log, MacosxService, MacportsPackage, Mdadm, Mount, MsuPackage, Notification, Ohai, OpenbsdPackage, OsxProfile, Package, PacmanPackage, PaludisPackage, Perl, PortagePackage, PowershellPackage, PowershellScript, Python, Reboot, RegistryKey, RemoteDirectory, RemoteFile, Route, RpmPackage, Ruby, RubyBlock, Scm, Script, Service, SmartosPackage, SolarisPackage, Subversion, SystemdUnit, Template, TimestampedDeploy, UnresolvedSubscribes, User, WhyrunSafeRubyBlock, WindowsPackage, WindowsScript, WindowsService, WindowsTask, YumPackage, YumRepository, ZypperPackage

Constant Summary collapse

FORBIDDEN_IVARS =

Internal Resource Interface (for Chef)

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

This classvariable is part of a private API. You should avoid using this classvariable if possible, as it may be removed or be changed in the future.

Deprecated.

We memoize a sorted version of descendants so that resource lookups don't have to sort all the things, all the time. This was causing performance issues in test runs, and probably in real life as well.

nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Mixin::ConvertToClassName

constantize, convert_to_class_name, convert_to_snake_case, filename_to_qualified_string, normalize_snake_case_name, snake_case_basename

Methods included from Mixin::Provides

provided_as, provides, provides?

Methods included from Mixin::DescendantsTracker

#descendants, descendants, #direct_descendants, direct_descendants, #find_descendants_by_name, find_descendants_by_name, #inherited, store_inherited

Methods included from Mixin::Deprecation

#deprecated_attr, #deprecated_attr_reader, #deprecated_attr_writer, #deprecated_ivar

Methods included from Mixin::Properties

included, #property_is_set?, #reset_property

Methods included from Mixin::ParamsValidate

#lazy, #set_or_return, #validate

Methods included from Mixin::ShellOut

#a_to_s, #clean_array, #shell_out, #shell_out!, #shell_out_compact, #shell_out_compact!, #shell_out_compact_timeout, #shell_out_compact_timeout!, #shell_out_with_systems_locale, #shell_out_with_systems_locale!

Methods included from Mixin::PathSanity

#enforce_path_sanity, #sanitized_path

Methods included from Mixin::PowershellOut

#powershell_out, #powershell_out!

Methods included from Mixin::WindowsArchitectureHelper

#assert_valid_windows_architecture!, #disable_wow64_file_redirection, #forced_32bit_override_required?, #is_i386_process_on_x86_64_windows?, #node_supports_windows_architecture?, #node_windows_architecture, #restore_wow64_file_redirection, #valid_windows_architecture?, #with_os_architecture, #wow64_architecture_override_required?, #wow64_directory

Methods included from DSL::PlatformIntrospection

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

Methods included from DSL::RebootPending

#reboot_pending?

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::DataQuery

#data_bag, #data_bag_item, #search

Methods included from EncryptedDataBagItem::CheckEncrypted

#encrypted?

Constructor Details

#initialize(name, run_context = nil) ⇒ Resource

Create a new Resource.


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# File 'lib/chef/resource.rb', line 131

def initialize(name, run_context = nil)
  name(name) unless name.nil?
  @run_context = run_context
  @before = nil
  @params = Hash.new
  @provider = nil
  @allowed_actions = self.class.allowed_actions.to_a
  @action = self.class.default_action
  @updated = false
  @updated_by_last_action = false
  @not_if = []
  @only_if = []
  @source_line = nil
  # We would like to raise an error when the user gives us a guard
  # interpreter and a ruby_block to the guard. In order to achieve this
  # we need to understand when the user overrides the default guard
  # interpreter. Therefore we store the default separately in a different
  # attribute.
  @guard_interpreter = nil
  @default_guard_interpreter = :default
  @elapsed_time = 0
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.


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# File 'lib/chef/resource.rb', line 1289

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}' for #{self.class}"
  end
end

Instance Attribute Details

#allowed_actions(value = NOT_PASSED) ⇒ Array<Symbol>

The list of actions this Resource is allowed to have. Setting action will fail unless it is in this list. Default: [ :nothing ]


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# File 'lib/chef/resource.rb', line 860

def allowed_actions
  @allowed_actions
end

#cookbook_nameString


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# File 'lib/chef/resource.rb', line 1194

def cookbook_name
  @cookbook_name
end

#declared_typeString


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# File 'lib/chef/resource.rb', line 1218

def declared_type
  @declared_type
end

#default_guard_interpreterClass, ... (readonly)

The guard interpreter that will be used to process only_if and not_if statements by default. If left unset, or set to :default, the guard interpreter used will be Chef::GuardInterpreter::DefaultGuardInterpreter.

Must be a resource class like Chef::Resource::Execute, or a corresponding to the name of a resource. The resource must descend from Chef::Resource::Execute.

TODO this needs to be coerced on input so that retrieval is consistent.


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# File 'lib/chef/resource.rb', line 851

def default_guard_interpreter
  @default_guard_interpreter
end

#elapsed_timeInteger (readonly)

The time it took (in seconds) to run the most recently-run action. Not cumulative across actions. This is set to 0 as soon as a new action starts running, and set to the elapsed time at the end of the action.

action. Not cumulative.


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# File 'lib/chef/resource.rb', line 462

def elapsed_time
  @elapsed_time
end

#enclosing_providerChef::Provider


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# File 'lib/chef/resource.rb', line 1203

def enclosing_provider
  @enclosing_provider
end

#paramsObject

XXX: this is required for definition params inside of the scope of a subresource to work correctly.


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# File 'lib/chef/resource.rb', line 1186

def params
  @params
end

#recipe_nameString


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# File 'lib/chef/resource.rb', line 1197

def recipe_name
  @recipe_name
end

#resource_initializingObject

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

If we are currently initializing the resource, this will be true.

Do NOT use this. It may be removed. It is for internal purposes only.


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# File 'lib/chef/resource.rb', line 620

def resource_initializing
  @resource_initializing
end

#run_contextChef::RunContext

where the context for the current Chef run is stored, including the node and the resource collection.


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# File 'lib/chef/resource.rb', line 1191

def run_context
  @run_context
end

#source_lineString


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# File 'lib/chef/resource.rb', line 1210

def source_line
  @source_line
end

#updatedBoolean (readonly)

Whether or not this resource was updated during an action. If multiple actions are set on the resource, this will be true if any action caused an update to happen.


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# File 'lib/chef/resource.rb', line 875

def updated
  @updated
end

Class Method Details

.action(action, &recipe_block) ⇒ Object

Define an action on this resource.

The action is defined as a recipe block that will be compiled and then converged when the action is taken (when Resource is converged). The recipe has access to the resource's attributes and methods, as well as the Chef recipe DSL.

Resources in the action recipe may notify and subscribe to other resources within the action recipe, but cannot notify or subscribe to resources in the main Chef run.

Resource actions are inheritable: if resource A defines action :create and B is a subclass of A, B gets all of A's actions. Additionally, resource B can define action :create and call super() to invoke A's action code.

The first action defined (besides :nothing) will become the default action for the resource.


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# File 'lib/chef/resource.rb', line 1066

def self.action(action, &recipe_block)
  action = action.to_sym
  declare_action_class
  action_class.action(action, &recipe_block)
  self.allowed_actions += [ action ]
  default_action action if Array(default_action) == [:nothing]
end

.action_class(&block) ⇒ Object

The action class is a Chef::Provider which is created at Resource class evaluation time when the Custom Resource is being constructed.

This happens the first time the ruby parser hits an action or an action_class method, the presence of either indiates that this is going to be a Chef-12.5 custom resource. If we never see one of these directives then we are constructing an old-style Resource+Provider or LWRP or whatevs.

If a block is passed, the action_class is always created and the block is run inside it.


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# File 'lib/chef/resource.rb', line 1125

def self.action_class(&block)
  @action_class ||= declare_action_class
  @action_class.class_eval(&block) if block
  @action_class
end

.allowed_actions(*actions) ⇒ Array<Symbol>

The list of allowed actions for the resource.


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# File 'lib/chef/resource.rb', line 990

def self.allowed_actions(*actions)
  @allowed_actions ||=
    if superclass.respond_to?(:allowed_actions)
      superclass.allowed_actions.dup
    else
      [ :nothing ]
    end
  @allowed_actions |= actions.flatten
end

.allowed_actions=(value) ⇒ Object


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# File 'lib/chef/resource.rb', line 1000

def self.allowed_actions=(value)
  @allowed_actions = value.uniq
end

.custom_resource?Boolean

Returns true or false based on if the resource is a custom resource. The top-level Chef::Resource is not a chef resource. This value is inherited.


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# File 'lib/chef/resource.rb', line 1135

def self.custom_resource?
  false
end

.declare_action_classObject

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Ensure the action class actually gets created. This is called when the user does action :x do ... end.


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# File 'lib/chef/resource.rb', line 1156

def self.declare_action_class
  @action_class ||=
    begin
      is_custom_resource!
      base_provider =
        if superclass.custom_resource?
          superclass.action_class
        else
          ActionClass
        end

      resource_class = self
      Class.new(base_provider) do
        self.resource_class = resource_class
      end
    end
end

.default_action(action_name = NOT_PASSED) ⇒ Array<Symbol>

The action that will be run if no other action is specified.

Setting default_action will automatially add the action to allowed_actions, if it isn't already there.

Defaults to [:nothing].


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# File 'lib/chef/resource.rb', line 1017

def self.default_action(action_name = NOT_PASSED)
  unless action_name.equal?(NOT_PASSED)
    @default_action = Array(action_name).map(&:to_sym)
    self.allowed_actions |= @default_action
  end

  if @default_action
    @default_action
  elsif superclass.respond_to?(:default_action)
    superclass.default_action
  else
    [:nothing]
  end
end

.default_action=(action_name) ⇒ Object


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# File 'lib/chef/resource.rb', line 1032

def self.default_action=(action_name)
  default_action action_name
end

.from_hash(o) ⇒ Object


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# File 'lib/chef/resource.rb', line 710

def self.from_hash(o)
  resource = new(o["instance_vars"]["@name"])
  o["instance_vars"].each do |k, v|
    resource.instance_variable_set("@#{k}".to_sym, v)
  end
  resource
end

.from_json(j) ⇒ Object


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# File 'lib/chef/resource.rb', line 722

def self.from_json(j)
  from_hash(Chef::JSONCompat.parse(j))
end

.identity_attr(name = nil) ⇒ Symbol

Deprecated.

identity_property should be used instead.

Set a property as the "identity attribute" for this resource.

Identical to calling #identity_property.first.key.

Raises:

  • (ArgumentError)

    If no arguments are passed and the resource has more than one identity property.


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# File 'lib/chef/resource.rb', line 832

def self.identity_attr(name = nil)
  property = identity_property(name)
  return nil if !property
  property.name
end

.identity_property(name = nil) ⇒ Symbol

Set the identity of this resource to a particular property.

This drives #identity, which returns data that uniquely refers to a given resource on the given node (in such a way that it can be correlated across Chef runs).

This method is unnecessary when declaring properties with property; properties can be added to identity during declaration with identity: true.

property :x, identity: true # part of identity
property :y # not part of identity

Raises:

  • (ArgumentError)

    If no arguments are passed and the resource has more than one identity property.


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# File 'lib/chef/resource.rb', line 810

def self.identity_property(name = nil)
  result = identity_properties(*Array(name))
  if result.size > 1
    raise Chef::Exceptions::MultipleIdentityError, "identity_property cannot be called on an object with more than one identity property (#{result.map { |r| r.name }.join(", ")})."
  end
  result.first
end

.inherited(child) ⇒ Object


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# File 'lib/chef/resource.rb', line 1275

def self.inherited(child)
  super
  @@sorted_descendants = nil
  # set resource_name automatically if it's not set
  if child.name && !child.resource_name
    if child.name =~ /^Chef::Resource::(\w+)$/
      child.resource_name(convert_to_snake_case($1))
    end
  end
end

.is_custom_resource!Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This sets the resource to being a custom resource, and does so in a way that automatically inherits to all subclasses via defining a method on the class (class variables and class instance variables don't have the correct semantics here, this is a poor man's activesupport class_attribute)


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# File 'lib/chef/resource.rb', line 1145

def self.is_custom_resource!
  define_singleton_method :custom_resource? do
    true
  end
end

.json_create(o) ⇒ Object


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# File 'lib/chef/resource.rb', line 718

def self.json_create(o)
  from_hash(o)
end

.load_current_value(&load_block) ⇒ Object

Define a method to load up this resource's properties with the current actual values.


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# File 'lib/chef/resource.rb', line 1081

def self.load_current_value(&load_block)
  define_method(:load_current_value!, &load_block)
end

.provides(name, **options, &block) ⇒ Object

Mark this resource as providing particular DSL.

Resources have an automatic DSL based on their resource_name, equivalent to provides :resource_name (providing the resource on all OS's). If you declare a provides with the given resource_name, it replaces that provides (so that you can provide your resource DSL only on certain OS's).


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# File 'lib/chef/resource.rb', line 1305

def self.provides(name, **options, &block)
  name = name.to_sym

  # `provides :resource_name, os: 'linux'`) needs to remove the old
  # canonical DSL before adding the new one.
  if @resource_name && name == @resource_name
    remove_canonical_dsl
  end

  result = Chef.resource_handler_map.set(name, self, options, &block)
  Chef::DSL::Resources.add_resource_dsl(name)
  result
end

.provides?(node, resource_name) ⇒ Boolean


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# File 'lib/chef/resource.rb', line 1319

def self.provides?(node, resource_name)
  Chef::ResourceResolver.new(node, resource_name).provided_by?(self)
end

.remove_canonical_dslObject


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# File 'lib/chef/resource.rb', line 1491

def self.remove_canonical_dsl
  if @resource_name
    remaining = Chef.resource_handler_map.delete_canonical(@resource_name, self)
    if !remaining
      Chef::DSL::Resources.remove_resource_dsl(@resource_name)
    end
  end
end

.resource_for_node(short_name, node) ⇒ Object

Returns a resource based on a short_name and node

==== Parameters short_name:: short_name of the resource (ie :directory) nodeChef::Node:: Node object to look up platform and version in

=== Returns Chef::Resource:: returns the proper Chef::Resource class


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# File 'lib/chef/resource.rb', line 1453

def self.resource_for_node(short_name, node)
  klass = Chef::ResourceResolver.resolve(short_name, node: node)
  raise Chef::Exceptions::NoSuchResourceType.new(short_name, node) if klass.nil?
  klass
end

.resource_matching_short_name(short_name) ⇒ Object

Returns the class with the given resource_name.

NOTE: Chef::Resource.resource_matching_short_name(:package) returns Chef::Resource::Package, while on rhel the API call Chef::Resource.resource_for_node(:package, node) will return Chef::Resource::YumPackage -- which is probably what you really want. This API should most likely be removed or changed to call resource_for_node.

==== Parameters short_name:: short_name of the resource (ie :directory)

=== Returns Chef::Resource:: returns the proper Chef::Resource class


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# File 'lib/chef/resource.rb', line 1475

def self.resource_matching_short_name(short_name)
  Chef::ResourceResolver.resolve(short_name, canonical: true)
end

.resource_name(name = NOT_PASSED) ⇒ Symbol

The display name of this resource type, for printing purposes.

This also automatically calls "provides" to provide DSL with the given name.

resource_name defaults to your class name.

Call resource_name nil to remove the resource name (and any corresponding DSL).


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# File 'lib/chef/resource.rb', line 946

def self.resource_name(name = NOT_PASSED)
  # Setter
  if name != NOT_PASSED
    remove_canonical_dsl

    # Set the resource_name and call provides
    if name
      name = name.to_sym
      # If our class is not already providing this name, provide it.
      if !Chef::ResourceResolver.includes_handler?(name, self)
        provides name, canonical: true
      end
      @resource_name = name
    else
      @resource_name = nil
    end
  end
  @resource_name
end

.resource_name=(name) ⇒ Object


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# File 'lib/chef/resource.rb', line 966

def self.resource_name=(name)
  resource_name(name)
end

.sorted_descendantsObject


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# File 'lib/chef/resource.rb', line 1271

def self.sorted_descendants
  @@sorted_descendants ||= descendants.sort_by { |x| x.to_s }
end

.state_attrs(*names) ⇒ Array<Symbol>

Deprecated.

Use state_properties.keys instead. Note that when you declare properties with property: properties are added to state_properties by default, and can be turned off with desired_state: false

property :x # part of desired state
property :y, desired_state: false # not part of desired state

Set or return the list of "state properties" implemented by the Resource subclass.

Equivalent to calling #state_properties and getting state_properties.keys.


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

def self.state_attrs(*names)
  state_properties(*names).map { |property| property.name }
end

.use_automatic_resource_nameObject

Use the class name as the resource name.

Munges the last part of the class name from camel case to snake case, and sets the resource_name to that:

A::B::BlahDBlah -> blah_d_blah


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# File 'lib/chef/resource.rb', line 978

def self.use_automatic_resource_name
  automatic_name = convert_to_snake_case(name.split("::")[-1])
  resource_name automatic_name
end

Instance Method Details

#action(arg = nil) ⇒ Array[Symbol]

The action or actions that will be taken when this resource is run.


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

def action(arg = nil)
  if arg
    arg = Array(arg).map(&:to_sym)
    arg.each do |action|
      validate(
        { action: action },
        { action: { kind_of: Symbol, equal_to: allowed_actions } }
      )
    end
    @action = arg
  else
    @action
  end
end

#action=Array[Symbol]

The action or actions that will be taken when this resource is run. Alias for normal assigment syntax.


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

def action(arg = nil)
  if arg
    arg = Array(arg).map(&:to_sym)
    arg.each do |action|
      validate(
        { action: action },
        { action: { kind_of: Symbol, equal_to: allowed_actions } }
      )
    end
    @action = arg
  else
    @action
  end
end

#after_createdObject

A hook called after a resource is created. Meant to be overriden by subclasses.


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# File 'lib/chef/resource.rb', line 926

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


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# File 'lib/chef/resource.rb', line 677

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

#before_notificationsObject


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# File 'lib/chef/resource.rb', line 1336

def before_notifications
  run_context.before_notifications(self)
end

#cookbook_versionObject

The cookbook in which this Resource was defined (if any).


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# File 'lib/chef/resource.rb', line 1383

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

#current_valueObject

Get the current actual value of this resource.

This does not cache--a new value will be returned each time.


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# File 'lib/chef/resource.rb', line 1103

def current_value
  provider = provider_for_action(Array(action).first)
  if provider.whyrun_mode? && !provider.whyrun_supported?
    raise "Cannot retrieve #{self.class.current_resource} in why-run mode: #{provider} does not support why-run"
  end
  provider.load_current_resource
  provider.current_resource
end

#current_value_does_not_exist!Object

Call this in load_current_value to indicate that the value does not exist and that current_resource should therefore be nil.

Raises:

  • Chef::Exceptions::CurrentValueDoesNotExist


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# File 'lib/chef/resource.rb', line 1091

def current_value_does_not_exist!
  raise Chef::Exceptions::CurrentValueDoesNotExist
end

#custom_exception_message(e) ⇒ String

Preface an exception message with generic Resource information.


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# File 'lib/chef/resource.rb', line 1410

def custom_exception_message(e)
  "#{self} (#{defined_at}) had an error: #{e.class.name}: #{e.message}"
end

#customize_exception(e) ⇒ Object


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# File 'lib/chef/resource.rb', line 1414

def customize_exception(e)
  new_exception = e.exception(custom_exception_message(e))
  new_exception.set_backtrace(e.backtrace)
  new_exception
end

#declared_keyObject

We usually want to store and reference resources by their declared type and not the actual type that was looked up by the Resolver (IE, "package" becomes YumPackage class). If we have not been provided the declared key we want to fall back on the old to_s key.


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# File 'lib/chef/resource.rb', line 1331

def declared_key
  return to_s if declared_type.nil?
  "#{declared_type}[#{@name}]"
end

#defined_atObject


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# File 'lib/chef/resource.rb', line 1364

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.
  if cookbook_name && recipe_name && source_line
    "#{cookbook_name}::#{recipe_name} line #{source_line_number}"
  elsif source_line
    "#{source_line_file} line #{source_line_number}"
  else
    "dynamically defined"
  end
end

#delayed_action(arg) ⇒ Object

Force a delayed notification into this resource's run_context.

This should most likely be paired with action :nothing


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

def delayed_action(arg)
  arg = Array(arg).map(&:to_sym)
  arg.map do |action|
    validate(
      { action: action },
      { action: { kind_of: Symbol, equal_to: allowed_actions } }
    )
    # the resource effectively sends a delayed notification to itself
    run_context.add_delayed_action(Notification.new(self, action, self))
  end
end

#delayed_notificationsObject


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# File 'lib/chef/resource.rb', line 1344

def delayed_notifications
  run_context.delayed_notifications(self)
end

#eventsObject


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# File 'lib/chef/resource.rb', line 1389

def events
  run_context.events
end

#guard_interpreter(arg = nil) ⇒ Class, ...

The guard interpreter that will be used to process only_if and not_if statements. If left unset, the #default_guard_interpreter will be used.

Must be a resource class like Chef::Resource::Execute, or a corresponding to the name of a resource. The resource must descend from Chef::Resource::Execute.

TODO this needs to be coerced on input so that retrieval is consistent.


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# File 'lib/chef/resource.rb', line 478

def guard_interpreter(arg = nil)
  if arg.nil?
    @guard_interpreter || @default_guard_interpreter
  else
    set_or_return(:guard_interpreter, arg, :kind_of => Symbol)
  end
end

#identityObject, Hash<Symbol,Object>

The value of the identity of this resource.

  • If there are no identity properties on the resource, name is returned.
  • If there is exactly one identity property on the resource, it is returned.
  • If there are more than one, they are returned in a hash.

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# File 'lib/chef/resource.rb', line 515

def identity
  result = {}
  identity_properties = self.class.identity_properties
  identity_properties.each do |property|
    result[property.name] = send(property.name)
  end
  return result.values.first if identity_properties.size == 1
  result
end

#ignore_failureObject Also known as: epic_fail

Whether to ignore failures. If set to true, and this resource when an action is run, the resource will be marked as failed but no exception will be thrown (and no error will be output). Defaults to false.

TODO ignore_failure and retries seem to be mutually exclusive; I doubt that was intended.


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# File 'lib/chef/resource.rb', line 536

property :ignore_failure, [ TrueClass, FalseClass ], default: false, desired_state: false

#immediate_notificationsObject


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# File 'lib/chef/resource.rb', line 1340

def immediate_notifications
  run_context.immediate_notifications(self)
end

#inspectObject


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# File 'lib/chef/resource.rb', line 667

def inspect
  ivars = instance_variables.map { |ivar| ivar.to_sym } - FORBIDDEN_IVARS
  ivars.inject("<#{self}") do |str, ivar|
    str << " #{ivar}: #{instance_variable_get(ivar).inspect}"
  end << ">"
end

#load_from(resource) ⇒ Object

Make this resource into an exact (shallow) copy of the other resource.


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# File 'lib/chef/resource.rb', line 548

def load_from(resource)
  resource.instance_variables.each do |iv|
    unless iv == :@source_line || iv == :@action || iv == :@not_if || iv == :@only_if
      instance_variable_set(iv, resource.instance_variable_get(iv))
    end
  end
end

#lookup_provider_constant(name, action = :nothing) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/chef/resource.rb', line 1480

def lookup_provider_constant(name, action = :nothing)
  # XXX: "name" is probably a poor choice of name here, ideally this would be nil, but we need to
  # fix resources so that nil or empty names work (also solving the apt_update "doesn't matter one bit"
  # problem).  WARNING: this string is not a public API and should not be referenced (e.g. in provides blocks)
  # and may change at any time.  If you've found this comment you're also probably very lost and should maybe
  # consider using `declare_resource :whatever` instead of trying to set `provider :whatever` on a resource, or in some
  # other way reconsider what you're trying to do, since you're likely trying to force a bad design that we
  # can't/won't support.
  self.class.resource_for_node(name, node).new("name", run_context).provider_for_action(action).class
end

#nameString

The name of this particular resource.

This special resource attribute is set automatically from the declaration of the resource, e.g.

execute 'Vitruvius' do command 'ls' end

Will set the name to "Vitruvius".

This is also used in to_s to show the resource name, e.g. execute[Vitruvius].

This is also used for resource notifications and subscribes in the same manner.

This will coerce any object into a string via #to_s. Arrays are a special case so that package ["foo", "bar"] becomes package[foo, bar] instead of the more awkward package[["foo", "bar"]] that #to_s would produce.


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# File 'lib/chef/resource.rb', line 87

property :name, String, coerce: proc { |v| v.is_a?(Array) ? v.join(", ") : v.to_s }, desired_state: false, required: true

#nodeChef::Node

The node the current Chef run is using.

Corresponds to run_context.node.


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# File 'lib/chef/resource.rb', line 96

def node
  run_context && run_context.node
end

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

A command or block that indicates whether to actually run this resource. The command or block is run just before the action actually executes, and the action will be skipped if the block returns true.

If a block is specified, it must return false in order for the Resource to be executed.

If a command is specified, the resource's #guard_interpreter will run the command and interpret the results according to opts. For example, the default execute resource will be treated as false if the command returns a non-zero exit code, and true if it returns 0. Thus, in the default case:

  • not_if "your command" will perform the action only if your command returns a non-zero code.
  • only_if "your command", valid_exit_codes: [ 1, 2, 3 ] will perform the action only if your command returns something other than 1, 2, or 3.

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

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

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

Sets up a notification that will run a particular action on another resource if and when this resource is updated by an action.

If the action does not update this resource, the notification never triggers.

Only one resource may be specified per notification.

delayed notifications will only ever happen once per resource, so if multiple resources all notify a single resource to perform the same action, the action will only happen once. However, if they ask for different actions, each action will happen once, in the order they were updated.

immediate notifications will cause the action to be triggered once per notification, regardless of how many other resources have triggered the notification as well.

Examples:

Resource by string

file '/foo.txt' do
  content 'hi'
  notifies :create, 'file[/bar.txt]'
end
file '/bar.txt' do
  action :nothing
  content 'hi'
end

Resource by hash

file '/foo.txt' do
  content 'hi'
  notifies :create, file: '/bar.txt'
end
file '/bar.txt' do
  action :nothing
  content 'hi'
end

Direct Resource

bar = file '/bar.txt' do
  action :nothing
  content 'hi'
end
file '/foo.txt' do
  content 'hi'
  notifies :create, bar
end

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# File 'lib/chef/resource.rb', line 252

def notifies(action, resource_spec, timing = :delayed)
  # when using old-style resources(:template => "/foo.txt") style, you
  # could end up with multiple resources.
  validate_resource_spec!(resource_spec)

  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)
    when "before"
      notifies_before(action, resource)
    else
      raise ArgumentError,  "invalid timing: #{timing} for notifies(#{action}, #{resources.inspect}, #{timing}) resource #{self} "\
        "Valid timings are: :delayed, :immediate, :immediately, :before"
    end
  end

  true
end

#notifies_before(action, resource_spec) ⇒ Object

Helper for #notifies


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# File 'lib/chef/resource.rb', line 1237

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

#notifies_delayed(action, resource_spec) ⇒ Object

Helper for #notifies


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# File 'lib/chef/resource.rb', line 1247

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

#notifies_immediately(action, resource_spec) ⇒ Object

Helper for #notifies


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# File 'lib/chef/resource.rb', line 1242

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

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

A command or block that indicates whether to actually run this resource. The command or block is run just before the action actually executes, and the action will be skipped if the block returns false.

If a block is specified, it must return true in order for the Resource to be executed.

If a command is specified, the resource's #guard_interpreter will run the command and interpret the results according to opts. For example, the default execute resource will be treated as false if the command returns a non-zero exit code, and true if it returns 0. Thus, in the default case:

  • only_if "your command" will perform the action only if your command returns 0.
  • only_if "your command", valid_exit_codes: [ 1, 2, 3 ] will perform the action only if your command returns 1, 2, or 3.

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# File 'lib/chef/resource.rb', line 388

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

#provider(arg = nil) ⇒ Object

The provider class for this resource.

If action :x do ... end has been declared on this resource or its superclasses, this will return the action_class.

If this is not set, provider_for_action will dynamically determine the provider.

See Also:


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# File 'lib/chef/resource.rb', line 749

def provider(arg = nil)
  klass = if arg.kind_of?(String) || arg.kind_of?(Symbol)
            lookup_provider_constant(arg)
          else
            arg
          end
  set_or_return(:provider, klass, kind_of: [ Class ])
end

#provider=(arg) ⇒ Object


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# File 'lib/chef/resource.rb', line 758

def provider=(arg)
  provider(arg)
end

#provider_for_action(action) ⇒ Object


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# File 'lib/chef/resource.rb', line 1397

def provider_for_action(action)
  provider_class = Chef::ProviderResolver.new(node, self, action).resolve
  provider = provider_class.new(self, run_context)
  provider.action = action
  provider
end

#resolve_notification_referencesObject

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


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# File 'lib/chef/resource.rb', line 1224

def resolve_notification_references
  run_context.before_notifications(self).each do |n|
    n.resolve_resource_reference(run_context.resource_collection)
  end
  run_context.immediate_notifications(self).each do |n|
    n.resolve_resource_reference(run_context.resource_collection)
  end
  run_context.delayed_notifications(self).each do |n|
    n.resolve_resource_reference(run_context.resource_collection)
  end
end

#resource_nameSymbol

The display name of this resource type, for printing purposes.

Will be used to print out the resource in messages, e.g. resource_name[name]


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# File 'lib/chef/resource.rb', line 918

def resource_name
  @resource_name || self.class.resource_name
end

#resources(*args) ⇒ Object

Find existing resources by searching the list of existing resources. Possible forms are:

find(:file => "foobar") find(:file => [ "foobar", "baz" ]) find("file[foobar]", "file[baz]") find("file[foobar,baz]")

Calls run_context.resource_collection.find(*args)

Raises:

  • ArgumentError if you feed it bad lookup information

  • RuntimeError if it can't find the resources you are looking for.


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# File 'lib/chef/resource.rb', line 116

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

#retriesInteger

The number of times to retry this resource if it fails by throwing an exception while running an action. Default: 0

When the retries have run out, the Resource will throw the last exception.


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

property :retries, Integer, default: 0, desired_state: false

#retry_delayInteger

The number of seconds to wait between retries. Default: 2.


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

property :retry_delay, Integer, default: 2, desired_state: false

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

Runs the given action on this resource, immediately.

Raises:

  • Any error that occurs during the actual action.


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# File 'lib/chef/resource.rb', line 565

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)

  # Don't modify @retries directly and keep it intact, so that the
  # recipe_snippet from ResourceFailureInspector can print the value
  # that was set in the resource block initially.
  remaining_retries = retries

  begin
    return if should_skip?(action)
    provider_for_action(action).run_action
  rescue StandardError => e
    if ignore_failure
      Chef::Log.error("#{custom_exception_message(e)}; ignore_failure is set, continuing")
      events.resource_failed(self, action, e)
    elsif remaining_retries > 0
      events.resource_failed_retriable(self, action, remaining_retries, e)
      remaining_retries -= 1
      Chef::Log.info("Retrying execution of #{self}, #{remaining_retries} attempt(s) left")
      sleep retry_delay
      retry
    else
      events.resource_failed(self, action, e)
      raise customize_exception(e)
    end
  end
ensure
  @elapsed_time = Time.now - start_time
  # Reporting endpoint doesn't accept a negative resource duration so set it to 0.
  # A negative value can occur when a resource changes the system time backwards
  @elapsed_time = 0 if @elapsed_time < 0
  events.resource_completed(self)
end

#sensitiveBoolean

Whether to treat this resource's data as sensitive. If set, no resource data will be displayed in log output.


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

property :sensitive, [ TrueClass, FalseClass ], default: false, desired_state: false

#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


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# File 'lib/chef/resource.rb', line 1430

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

#source_line_fileObject


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# File 'lib/chef/resource.rb', line 1348

def source_line_file
  if source_line
    source_line.match(/(.*):(\d+):?.*$/).to_a[1]
  else
    nil
  end
end

#source_line_numberObject


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# File 'lib/chef/resource.rb', line 1356

def source_line_number
  if source_line
    source_line.match(/(.*):(\d+):?.*$/).to_a[2]
  else
    nil
  end
end

#state_for_resource_reporterHash{Symbol => Object}

Get the value of the state attributes in this resource as a hash.

Does not include properties that are not set (unless they are identity properties).


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

def state_for_resource_reporter
  state = {}
  state_properties = self.class.state_properties
  state_properties.each do |property|
    if property.identity? || property.is_set?(self)
      state[property.name] = property.sensitive? ? "*sensitive value suppressed*" : send(property.name)
    end
  end
  state
end

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

Subscribes to updates from other resources, causing a particular action to run on this resource when the other resource is updated.

If multiple resources are specified, this resource action will be run if any of them change.

This notification will only trigger once, no matter how many other resources are updated (or how many actions are run by a particular resource).

Examples:

Resources by string

file '/foo.txt' do
  content 'hi'
  action :nothing
  subscribes :create, 'file[/bar.txt]'
end
file '/bar.txt' do
  content 'hi'
end

Direct resource

bar = file '/bar.txt' do
  content 'hi'
end
file '/foo.txt' do
  content 'hi'
  action :nothing
  subscribes :create, '/bar.txt'
end

Multiple resources by string

file '/foo.txt' do
  content 'hi'
  action :nothing
  subscribes :create, [ 'file[/bar.txt]', 'file[/baz.txt]' ]
end
file '/bar.txt' do
  content 'hi'
end
file '/baz.txt' do
  content 'hi'
end

Multiple resources

bar = file '/bar.txt' do
  content 'hi'
end
baz = file '/bar.txt' do
  content 'hi'
end
file '/foo.txt' do
  content 'hi'
  action :nothing
  subscribes :create, [ bar, baz ]
end

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# File 'lib/chef/resource.rb', line 351

def subscribes(action, resources, timing = :delayed)
  resources = [resources].flatten
  resources.each do |resource|
    if resource.is_a?(String)
      resource = UnresolvedSubscribes.new(resource, run_context)
    end
    if resource.run_context.nil?
      resource.run_context = run_context
    end
    resource.notifies(action, self, timing)
  end
  true
end

#to_hashObject


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

def to_hash
  # Grab all current state, then any other ivars (backcompat)
  result = {}
  self.class.state_properties.each do |p|
    result[p.name] = p.get(self)
  end
  safe_ivars = instance_variables.map { |ivar| ivar.to_sym } - FORBIDDEN_IVARS
  safe_ivars.each do |iv|
    key = iv.to_s.sub(/^@/, "").to_sym
    next if result.has_key?(key)
    result[key] = instance_variable_get(iv)
  end
  result
end

#to_json(*a) ⇒ Object

Serialize this object as a hash


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# File 'lib/chef/resource.rb', line 690

def to_json(*a)
  results = as_json
  Chef::JSONCompat.to_json(results, *a)
end

#to_sObject

Generic Ruby and Data Structure Stuff (for user)


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# File 'lib/chef/resource.rb', line 633

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

#to_textObject


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# File 'lib/chef/resource.rb', line 637

def to_text
  return "suppressed sensitive resource output" if sensitive
  text = "# Declared in #{@source_line}\n\n"
  text << "#{resource_name}(\"#{name}\") do\n"

  all_props = {}
  self.class.state_properties.map do |p|
    all_props[p.name.to_s] = p.sensitive? ? '"*sensitive value suppressed*"' : value_to_text(p.get(self))
  end

  ivars = instance_variables.map { |ivar| ivar.to_sym } - HIDDEN_IVARS
  ivars.each do |ivar|
    iv = ivar.to_s.sub(/^@/, "")
    if all_props.keys.include?(iv)
      text << "  #{iv} #{all_props[iv]}\n"
    elsif (value = instance_variable_get(ivar)) && !(value.respond_to?(:empty?) && value.empty?)
      text << "  #{iv} #{value_to_text(value)}\n"
    end
  end

  [@not_if, @only_if].flatten.each do |conditional|
    text << "  #{conditional.to_text}\n"
  end
  text << "end\n"
end

#updated?Boolean

Whether or not this resource was updated during an action. If multiple actions are set on the resource, this will be true if any action caused an update to happen.


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# File 'lib/chef/resource.rb', line 884

def updated?
  updated
end

#updated_by_last_action(true_or_false) ⇒ Boolean

Whether or not this resource was updated during the most recent action. This is set to false at the beginning of each action.


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# File 'lib/chef/resource.rb', line 896

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

Whether or not this resource was updated during the most recent action. This is set to false at the beginning of each action.


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# File 'lib/chef/resource.rb', line 907

def updated_by_last_action?
  @updated_by_last_action
end

#validate_action(action) ⇒ Object

Raises:

  • (ArgumentError)

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# File 'lib/chef/resource.rb', line 1393

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

Helper for #notifies


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# File 'lib/chef/resource.rb', line 1324

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

#value_to_text(value) ⇒ Object


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# File 'lib/chef/resource.rb', line 663

def value_to_text(value)
  value.respond_to?(:to_text) ? value.to_text : value.inspect
end