Class: Chef::Resource

Inherits:
Object
  • Object
show all
Extended by:
Mixin::ConvertToClassName, Mixin::Provides
Includes:
DSL::DataQuery, DSL::PlatformIntrospection, DSL::RebootPending, 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/reboot.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/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/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/dsc_resource.rb,
lib/chef/resource/http_request.rb,
lib/chef/resource/registry_key.rb,
lib/chef/resource/cookbook_file.rb,
lib/chef/resource/macosx_service.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/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/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/timestamped_deploy.rb,
lib/chef/resource/easy_install_package.rb,
lib/chef/resource/resource_notification.rb,
lib/chef/resource/whyrun_safe_ruby_block.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, DscResource, DscScript, EasyInstallPackage, Env, ErlCall, Execute, File, FreebsdPackage, GemPackage, Git, Group, HomebrewPackage, HttpRequest, Ifconfig, IpsPackage, LWRPBase, Link, Log, MacosxService, MacportsPackage, Mdadm, Mount, Notification, Ohai, OpenbsdPackage, Package, PacmanPackage, PaludisPackage, Perl, PortagePackage, PowershellScript, Python, Reboot, RegistryKey, RemoteDirectory, RemoteFile, Route, RpmPackage, Ruby, RubyBlock, Scm, Script, Service, SmartosPackage, SolarisPackage, Subversion, Template, TimestampedDeploy, User, WhyrunSafeRubyBlock, WindowsPackage, WindowsScript, WindowsService, YumPackage

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]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Mixin::Provides

node_map, 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::ConvertToClassName

constantize, 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::ParamsValidate

#lazy, #set_or_return, #validate

Methods included from DSL::RebootPending

#reboot_pending?

Methods included from DSL::PlatformIntrospection

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

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.

Parameters:

  • name —

    The name of this resource (corresponds to the #name attribute, used for notifications to this resource).

  • run_context (defaults to: nil) —

    The context of the Chef run. Corresponds to #run_context.



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# File 'lib/chef/resource.rb', line 94

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
  # 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
  @sensitive = false
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 955

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 ⇒ Array<Symbol>

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

Returns:

  • (Array<Symbol>) —

    The list of actions this Resource is allowed to have.



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# File 'lib/chef/resource.rb', line 751

def allowed_actions
  @allowed_actions
end

#cookbook_name ⇒ String

Returns The cookbook this resource was declared in.

Returns:

  • (String) —

    The cookbook this resource was declared in.



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# File 'lib/chef/resource.rb', line 894

def cookbook_name
  @cookbook_name
end

#declared_type ⇒ String

The actual name that was used to create this resource. Sometimes, when you say something like ‘package ’blah’‘, the system will create a different resource (i.e. YumPackage). When this happens, the user will expect to see the thing they wrote, not the type that was returned. May be nil, in which case callers should read #resource_name. See #declared_key.

Returns:

  • (String) —

    The actual name that was used to create this resource. Sometimes, when you say something like ‘package ’blah’‘, the system will create a different resource (i.e. YumPackage). When this happens, the user will expect to see the thing they wrote, not the type that was returned. May be nil, in which case callers should read #resource_name. See #declared_key.



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

def declared_type
  @declared_type
end

#default_guard_interpreter ⇒ Class, ... (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.

Returns:

  • (Class, Symbol, String) —

    the default Guard interpreter resource.



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# File 'lib/chef/resource.rb', line 742

def default_guard_interpreter
  @default_guard_interpreter
end

#elapsed_time ⇒ Integer (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.

Returns:

  • (Integer) —

    The time (in seconds) it took to process the most recent



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

def elapsed_time
  @elapsed_time
end

#enclosing_provider ⇒ Chef::Provider

Returns The provider this resource was declared in (if it was declared in an LWRP). When you call methods that do not exist on this Resource, Chef will try to call the method on the provider as well before giving up.

Returns:

  • (Chef::Provider) —

    The provider this resource was declared in (if it was declared in an LWRP). When you call methods that do not exist on this Resource, Chef will try to call the method on the provider as well before giving up.



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# File 'lib/chef/resource.rb', line 903

def enclosing_provider
  @enclosing_provider
end

#ignore_failure(arg = nil) ⇒ Object

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.

Parameters:

  • arg (Boolean) (defaults to: nil) —

    Whether to ignore failures.

Returns:

  • Whether this resource will ignore failures.



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# File 'lib/chef/resource.rb', line 502

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

#not_if_args ⇒ Object (readonly)

??? TODO unreferenced. Delete?



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

def not_if_args
  @not_if_args
end

#only_if_args ⇒ Object (readonly)

??? TODO unreferenced. Delete?



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

def only_if_args
  @only_if_args
end

#params ⇒ Object

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 886

def params
  @params
end

#recipe_name ⇒ String

Returns The recipe this resource was declared in.

Returns:

  • (String) —

    The recipe this resource was declared in.



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# File 'lib/chef/resource.rb', line 897

def recipe_name
  @recipe_name
end

#resource_name ⇒ String (readonly)

The name of this resource (e.g. file)

Returns:

  • (String) —

    The name of this resource.



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# File 'lib/chef/resource.rb', line 822

def resource_name
  @resource_name
end

#retries(arg = nil) ⇒ Integer

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.

Parameters:

  • arg (Integer) (defaults to: nil) —

    The number of retries.

Returns:

  • (Integer) —

    The number of retries.



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

def retries(arg=nil)
  set_or_return(:retries, arg, kind_of: Integer)
end

#retry_delay(arg = nil) ⇒ Integer

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

Parameters:

  • arg (Integer) (defaults to: nil) —

    The number of seconds to wait between retries.

Returns:

  • (Integer) —

    The number of seconds to wait between retries.



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

def retry_delay(arg=nil)
  set_or_return(:retry_delay, arg, kind_of: Integer)
end

#run_context ⇒ Chef::RunContext

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

Returns:



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# File 'lib/chef/resource.rb', line 891

def run_context
  @run_context
end

#sensitive(arg = nil) ⇒ Boolean

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

Parameters:

  • arg (Boolean) (defaults to: nil) —

    Whether this resource is sensitive or not.

Returns:

  • (Boolean) —

    Whether this resource is sensitive or not.



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

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

#source_line ⇒ String

Returns The source line where this resource was declared. Expected to come from caller() or a stack trace, it usually follows one of these formats:

/some/path/to/file.rb:80:in `wombat_tears'
C:/some/path/to/file.rb:80 in 1`wombat_tears'.

Returns:

  • (String) —

    The source line where this resource was declared. Expected to come from caller() or a stack trace, it usually follows one of these formats:

    /some/path/to/file.rb:80:in `wombat_tears'
C:/some/path/to/file.rb:80 in 1`wombat_tears'



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# File 'lib/chef/resource.rb', line 910

def source_line
  @source_line
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.

Returns:

  • (Boolean) —

    Whether the resource was updated during an action.



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# File 'lib/chef/resource.rb', line 760

def updated
  @updated
end

Class Method Details

.dsl_name ⇒ String

The DSL name of this resource (e.g. package or yum_package)

Returns:

  • (String) —

    The DSL name of this resource.



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# File 'lib/chef/resource.rb', line 813

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.



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

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 



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# File 'lib/chef/resource.rb', line 649

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

.provider_base(arg = nil) ⇒ Module

The module where Chef should look for providers for this resource. The provider for MyResource will be looked up using provider_base::MyResource. Defaults to Chef::Provider.

Examples:

class MyResource < Chef::Resource
  provider_base Chef::Provider::Deploy
  # ...other stuff
end

Parameters:

  • arg (Module) (defaults to: nil) —

    The module containing providers for this resource

Returns:

  • (Module) —

    The module containing providers for this resource



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# File 'lib/chef/resource.rb', line 868

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

.resource_for_node(short_name, node) ⇒ Object

Returns a resource based on a short_name and node

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

Raises:



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# File 'lib/chef/resource.rb', line 1092

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

.resource_matching_short_name(short_name) ⇒ Object

Returns the class of a Chef::Resource based on the short name

Parameters

short_name<Symbol>

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 1105

def self.resource_matching_short_name(short_name)
  begin
    rname = convert_to_class_name(short_name.to_s)
    Chef::Resource.const_get(rname)
  rescue NameError
    nil
  end
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.



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

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) ⇒ Array[Symbol]

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

Parameters:

  • arg (Array[Symbol], Symbol) (defaults to: nil) —

    A list of actions (e.g. :create)

Returns:

  • (Array[Symbol]) —

    the list of actions.



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# File 'lib/chef/resource.rb', line 163

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

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



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# File 'lib/chef/resource.rb', line 850

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 621

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

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

Returns:

  • Chef::CookbookVersion The cookbook in which this Resource was defined.



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# File 'lib/chef/resource.rb', line 1004

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

#custom_exception_message(e) ⇒ String

Preface an exception message with generic Resource information.

Parameters:

  • e (StandardError) —

    An exception with e.message

Returns:

  • (String) —

    An exception message customized with class name.



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# File 'lib/chef/resource.rb', line 1049

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 1053

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

#declared_key ⇒ Object

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 971

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

#defined_at ⇒ Object 



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# File 'lib/chef/resource.rb', line 984

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 



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# File 'lib/chef/resource.rb', line 980

def delayed_notifications
  run_context.delayed_notifications(self)
end

#epic_fail(arg = nil) ⇒ Object

Equivalent to #ignore_failure.



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# File 'lib/chef/resource.rb', line 510

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

#events ⇒ Object 



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# File 'lib/chef/resource.rb', line 1010

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.

Parameters:

  • arg (Class, Symbol, String) (defaults to: nil) —

    The Guard interpreter resource class/ symbol/name.

Returns:

  • (Class, Symbol, String) —

    The Guard interpreter resource.



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# File 'lib/chef/resource.rb', line 457

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

#identity ⇒ Object

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

Returns:

  • The value of the identity attribute.



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# File 'lib/chef/resource.rb', line 483

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

#immediate_notifications ⇒ Object 



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# File 'lib/chef/resource.rb', line 976

def immediate_notifications
  run_context.immediate_notifications(self)
end

#inspect ⇒ Object 



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# File 'lib/chef/resource.rb', line 611

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

TODO Seems unused. Delete?



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# File 'lib/chef/resource.rb', line 1035

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

#load_from(resource) ⇒ Object

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

Parameters:



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# File 'lib/chef/resource.rb', line 519

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

#name(name = nil) ⇒ String

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.

Parameters:

  • name (Object) (defaults to: nil) —

    The name to set, typically a String or Array

Returns:

  • (String) —

    The name of this Resource.



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# File 'lib/chef/resource.rb', line 146

def name(name=nil)
  if !name.nil?
    if name.is_a?(Array)
      @name = name.join(', ')
    else
      @name = name.to_s
    end
  end
  @name
end

#node ⇒ Chef::Node

The node the current Chef run is using.

Corresponds to run_context.node.

Returns:

  • (Chef::Node) —

    The node the current Chef run is using.



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# File 'lib/chef/resource.rb', line 58

def node
  run_context && run_context.node
end

#noop(tf = nil) ⇒ Object

??? TODO Seems unused. Delete?



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# File 'lib/chef/resource.rb', line 1026

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

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.

Parameters:

  • command (String) (defaults to: nil) —

    A string to execute.

  • opts (Hash) (defaults to: {}) —

    Options control the execution of the command

  • block (Proc) —

    A ruby block to run. Ignored if a command is given.



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# File 'lib/chef/resource.rb', line 383

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 nothing–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

Parameters:

  • action —

    The action to run on the other resource.

  • resource_spec (String, Hash, Chef::Resource) —

    The resource to run.

  • timing (String, Symbol) (defaults to: :delayed) —

    When to notify. Has these values:

    • delayed: Will run the action on the other resource after all other actions have been run. This is the default.

    • immediate, immediately: Will run the action on the other resource immediately (before any other action is run).



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# File 'lib/chef/resource.rb', line 233

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)
    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

Helper for #notifies



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# File 'lib/chef/resource.rb', line 939

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 934

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.

Parameters:

  • command (String) (defaults to: nil) —

    A string to execute.

  • opts (Hash) (defaults to: {}) —

    Options control the execution of the command

  • block (Proc) —

    A ruby block to run. Ignored if a command is given.



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# File 'lib/chef/resource.rb', line 353

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

Parameters:

  • arg (String, Symbol, Class) (defaults to: nil) —

    Sets the provider class for this resource. If passed a String or Symbol, e.g. :file or ‘“file”`, looks up the provider based on the name.

Returns:

  • The provider class for this resource.



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# File 'lib/chef/resource.rb', line 675

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 683

def provider=(arg)
  provider(arg)
end

#provider_for_action(action) ⇒ Object 



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# File 'lib/chef/resource.rb', line 1018

def provider_for_action(action)
  require 'chef/provider_resolver'
  provider = Chef::ProviderResolver.new(node, self, action).resolve.new(self, run_context)
  provider.action = action
  provider
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.



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# File 'lib/chef/resource.rb', line 924

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

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)`

Returns:

  • the matching resource, or an Array of matching resources.

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 78

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

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

Runs the given action on this resource, immediately.

Parameters:

  • action —

    The action to run (e.g. :create)

  • notification_type (defaults to: nil) —

    The notification type that triggered this (if any)

  • notifying_resource (defaults to: nil) —

    The resource that triggered this notification (if any)

Raises:

  • Any error that occurs during the actual action.



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

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 Exception => 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
  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
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) 


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# File 'lib/chef/resource.rb', line 1069

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 ⇒ Hash{Symbol => Object}

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

Returns:

  • (Hash{Symbol => Object}) —

    A Hash of attribute => value for the Resource class’s state_attrs.



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# File 'lib/chef/resource.rb', line 470

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

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

Parameters:

  • action —

    The action to run on the other resource.

  • resources (String, Resource, Array[String, Resource]) —

    The resources to subscribe to.

  • timing (String, Symbol) (defaults to: :delayed) —

    When to notify. Has these values:

    • delayed: An update will cause the action to run after all other actions have been run. This is the default.

    • immediate, immediately: The action will run immediately following the other resource being updated.



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# File 'lib/chef/resource.rb', line 316

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

Sets a list of capabilities of the real resource. For example, :remount (for filesystems) and :restart (for services).

TODO Calling resource.supports({}) will not set this to empty; it will do a get instead. That’s wrong.

Parameters:

  • args (defaults to: {}) —

    HashSymbol=>Boolean If non-empty, sets the capabilities of this resource. Default: {}



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# File 'lib/chef/resource.rb', line 835

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

#supports=(args) ⇒ Object 



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# File 'lib/chef/resource.rb', line 842

def supports=(args)
  supports(args)
end

#to_hash ⇒ Object 



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# File 'lib/chef/resource.rb', line 639

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



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# File 'lib/chef/resource.rb', line 634

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

#to_s ⇒ Object

Generic Ruby and Data Structure Stuff (for user)



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# File 'lib/chef/resource.rb', line 590

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

#to_text ⇒ Object 



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# File 'lib/chef/resource.rb', line 594

def to_text
  return "suppressed sensitive resource output" if sensitive
  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

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.

Returns:

  • (Boolean) —

    Whether the resource was updated during an action.



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# File 'lib/chef/resource.rb', line 769

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.

Parameters:

  • true_or_false (Boolean) —

    Whether the resource was updated during the current / most recent action.

Returns:

  • (Boolean) —

    Whether the resource was updated during the most recent action.



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

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.

Returns:

  • (Boolean) —

    Whether the resource was updated during the most recent action.



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# File 'lib/chef/resource.rb', line 792

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 1014

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 964

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