Class: Chef::Resource

Inherits:
Object
  • Object
show all
Extended by:
DSL::Universal, Mixin::ConvertToClassName, Mixin::Provides
Includes:
DSL::DataQuery, DSL::DeclareResource, 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/ksh.rb,
lib/chef/resource/log.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/sudo.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/plist.rb,
lib/chef/resource/route.rb,
lib/chef/resource/cron_d.rb,
lib/chef/resource/locale.rb,
lib/chef/resource/python.rb,
lib/chef/resource/reboot.rb,
lib/chef/resource/script.rb,
lib/chef/resource/sysctl.rb,
lib/chef/resource/execute.rb,
lib/chef/resource/launchd.rb,
lib/chef/resource/package.rb,
lib/chef/resource/scm/git.rb,
lib/chef/resource/service.rb,
lib/chef/resource/chef_gem.rb,
lib/chef/resource/hostname.rb,
lib/chef/resource/ifconfig.rb,
lib/chef/resource/template.rb,
lib/chef/resource/timezone.rb,
lib/chef/resource/directory.rb,
lib/chef/resource/lwrp_base.rb,
lib/chef/resource/ohai_hint.rb,
lib/chef/resource/rhsm_repo.rb,
lib/chef/resource/swap_file.rb,
lib/chef/resource/apt_update.rb,
lib/chef/resource/breakpoint.rb,
lib/chef/resource/chef_sleep.rb,
lib/chef/resource/dsc_script.rb,
lib/chef/resource/ruby_block.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/cron_access.rb,
lib/chef/resource/dmg_package.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/rhsm_errata.rb,
lib/chef/resource/rpm_package.rb,
lib/chef/resource/user_ulimit.rb,
lib/chef/resource/windows_env.rb,
lib/chef/resource/windows_uac.rb,
lib/chef/resource/yum_package.rb,
lib/chef/resource/action_class.rb,
lib/chef/resource/alternatives.rb,
lib/chef/resource/archive_file.rb,
lib/chef/resource/chef_handler.rb,
lib/chef/resource/dpkg_package.rb,
lib/chef/resource/dsc_resource.rb,
lib/chef/resource/homebrew_tap.rb,
lib/chef/resource/http_request.rb,
lib/chef/resource/notify_group.rb,
lib/chef/resource/registry_key.rb,
lib/chef/resource/snap_package.rb,
lib/chef/resource/systemd_unit.rb,
lib/chef/resource/user/pw_user.rb,
lib/chef/resource/windows_font.rb,
lib/chef/resource/windows_path.rb,
lib/chef/resource/windows_task.rb,
lib/chef/resource/cookbook_file.rb,
lib/chef/resource/homebrew_cask.rb,
lib/chef/resource/kernel_module.rb,
lib/chef/resource/rhsm_register.rb,
lib/chef/resource/user/aix_user.rb,
lib/chef/resource/user/mac_user.rb,
lib/chef/resource/windows_share.rb,
lib/chef/resource/apt_preference.rb,
lib/chef/resource/apt_repository.rb,
lib/chef/resource/macosx_service.rb,
lib/chef/resource/pacman_package.rb,
lib/chef/resource/scm/subversion.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/build_essential.rb,
lib/chef/resource/freebsd_package.rb,
lib/chef/resource/openbsd_package.rb,
lib/chef/resource/openssl_dhparam.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_ad_join.rb,
lib/chef/resource/windows_feature.rb,
lib/chef/resource/windows_package.rb,
lib/chef/resource/windows_printer.rb,
lib/chef/resource/windows_service.rb,
lib/chef/resource/chef_client_cron.rb,
lib/chef/resource/homebrew_package.rb,
lib/chef/resource/macports_package.rb,
lib/chef/resource/openssl_x509_crl.rb,
lib/chef/resource/remote_directory.rb,
lib/chef/resource/windows_auto_run.rb,
lib/chef/resource/windows_dns_zone.rb,
lib/chef/resource/windows_pagefile.rb,
lib/chef/resource/windows_shortcut.rb,
lib/chef/resource/chef_vault_secret.rb,
lib/chef/resource/chocolatey_config.rb,
lib/chef/resource/chocolatey_source.rb,
lib/chef/resource/file/verification.rb,
lib/chef/resource/powershell_script.rb,
lib/chef/resource/rhsm_errata_level.rb,
lib/chef/resource/rhsm_subscription.rb,
lib/chef/resource/user/solaris_user.rb,
lib/chef/resource/user/windows_user.rb,
lib/chef/resource/windows_workgroup.rb,
lib/chef/resource/zypper_repository.rb,
lib/chef/resource/chocolatey_feature.rb,
lib/chef/resource/chocolatey_package.rb,
lib/chef/resource/macos_userdefaults.rb,
lib/chef/resource/powershell_package.rb,
lib/chef/resource/windows_dfs_folder.rb,
lib/chef/resource/windows_dfs_server.rb,
lib/chef/resource/windows_dns_record.rb,
lib/chef/resource/windows_certificate.rb,
lib/chef/resource/openssl_x509_request.rb,
lib/chef/resource/windows_feature_dism.rb,
lib/chef/resource/windows_printer_port.rb,
lib/chef/resource/openssl_ec_public_key.rb,
lib/chef/resource/resource_notification.rb,
lib/chef/resource/ssh_known_hosts_entry.rb,
lib/chef/resource/windows_dfs_namespace.rb,
lib/chef/resource/windows_firewall_rule.rb,
lib/chef/resource/openssl_ec_private_key.rb,
lib/chef/resource/openssl_rsa_public_key.rb,
lib/chef/resource/whyrun_safe_ruby_block.rb,
lib/chef/resource/windows_user_privilege.rb,
lib/chef/resource/openssl_rsa_private_key.rb,
lib/chef/resource/windows_security_policy.rb,
lib/chef/resource/openssl_x509_certificate.rb,
lib/chef/resource/chef_client_systemd_timer.rb,
lib/chef/resource/powershell_package_source.rb,
lib/chef/resource/chef_client_scheduled_task.rb,
lib/chef/resource/windows_feature_powershell.rb,
lib/chef/resource/conditional_action_not_nothing.rb,
lib/chef/resource/file/verification/systemd_unit.rb

Defined Under Namespace

Classes: ActionClass, Alternatives, AptPackage, AptPreference, AptRepository, AptUpdate, ArchiveFile, Bash, Batch, BffPackage, Breakpoint, BuildEssential, CabPackage, ChefClientCron, ChefClientScheduledTask, ChefClientSystemdTimer, ChefGem, ChefHandler, ChefSleep, ChefVaultSecret, ChocolateyConfig, ChocolateyFeature, ChocolateyPackage, ChocolateySource, Conditional, ConditionalActionNotNothing, CookbookFile, Cron, CronAccess, CronD, Csh, Directory, DmgPackage, DnfPackage, DpkgPackage, DscResource, DscScript, Execute, File, FreebsdPackage, GemPackage, Git, Group, HomebrewCask, HomebrewPackage, HomebrewTap, Hostname, HttpRequest, Ifconfig, IpsPackage, KernelModule, Ksh, LWRPBase, Launchd, Link, Locale, Log, MacosUserDefaults, MacosxService, MacportsPackage, Mdadm, Mount, MsuPackage, Notification, NotifyGroup, Ohai, OhaiHint, OpenbsdPackage, OpensslDhparam, OpensslEcPrivateKey, OpensslEcPublicKey, OpensslRsaPrivateKey, OpensslRsaPublicKey, OpensslX509Certificate, OpensslX509Crl, OpensslX509Request, OsxProfile, Package, PacmanPackage, PaludisPackage, Perl, PlistResource, PortagePackage, PowershellPackage, PowershellPackageSource, PowershellScript, Python, Reboot, RegistryKey, RemoteDirectory, RemoteFile, RhsmErrata, RhsmErrataLevel, RhsmRegister, RhsmRepo, RhsmSubscription, Route, RpmPackage, Ruby, RubyBlock, Script, Service, SmartosPackage, SnapPackage, SolarisPackage, SshKnownHostsEntry, Subversion, Sudo, SwapFile, Sysctl, SystemdUnit, Template, Timezone, UnresolvedSubscribes, User, UserUlimit, WhyrunSafeRubyBlock, WindowsAdJoin, WindowsAutorun, WindowsCertificate, WindowsDfsFolder, WindowsDfsNamespace, WindowsDfsServer, WindowsDnsRecord, WindowsDnsZone, WindowsEnv, WindowsFeature, WindowsFeatureDism, WindowsFeaturePowershell, WindowsFirewallRule, WindowsFont, WindowsPackage, WindowsPagefile, WindowsPath, WindowsPrinter, WindowsPrinterPort, WindowsScript, WindowsSecurityPolicy, WindowsService, WindowsShare, WindowsShortcut, WindowsTask, WindowsUac, WindowsUserPrivilege, WindowsWorkgroup, YumPackage, YumRepository, ZypperPackage, ZypperRepository

Constant Summary collapse

FORBIDDEN_IVARS =

FORBIDDEN_IVARS do not show up when the resource is converted to JSON (ie. hidden from data_collector and sending to the chef server via #to_json/to_h/as_json/inspect)

i{@run_context @logger @not_if @only_if @enclosing_provider @description @introduced @examples @validation_message @deprecated @default_description @skip_docs @executed_by_runner}.freeze
HIDDEN_IVARS =

HIDDEN_IVARS do not show up when the resource is displayed to the user as text (ie. in the error inspector output via #to_text)

i{@allowed_actions @resource_name @source_line @run_context @logger @name @not_if @only_if @elapsed_time @enclosing_provider @description @introduced @examples @validation_message @deprecated @default_description @skip_docs @executed_by_runner}.freeze
@@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::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::LazyModuleInclude

#descendants, #include, #included

Methods included from Mixin::ShellOut

apply_default_env, maybe_add_timeout, #shell_out, #shell_out!

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 Mixin::PowershellExec

#powershell_exec, #powershell_exec!

Methods included from DSL::Powershell

#ps_credential

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::ChefVault

#chef_vault, #chef_vault_item, #chef_vault_item_for_environment

Methods included from DSL::DataQuery

#data_bag, #data_bag_item, #search, #tagged?

Methods included from EncryptedDataBagItem::CheckEncrypted

#encrypted?

Methods included from DSL::PlatformIntrospection

#older_than_win_2012_or_8?, #platform?, #platform_family?, #value_for_platform, #value_for_platform_family

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::Deprecation

#deprecated_attr, #deprecated_attr_reader, #deprecated_attr_writer, #deprecated_ivar

Methods included from Mixin::Properties

#copy_properties_from, included, #property_description, #property_is_set?, #reset_property

Methods included from Mixin::ParamsValidate

#lazy, #set_or_return, #validate

Methods included from DSL::RebootPending

#reboot_pending?

Methods included from DSL::DeclareResource

#build_resource, #declare_resource, #delete_resource, #delete_resource!, #edit_resource, #edit_resource!, #find_resource, #find_resource!, #resources, #with_run_context

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 114

def initialize(name, run_context = nil)
  name(name) unless name.nil?
  @run_context = run_context

  @logger = if run_context
              run_context.logger.with_child({ name: name, resource: resource_name })
            else
              Chef::Log.with_child({ name: name, resource: resource_name })
            end

  @before = nil
  @params = {}
  @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
  @deprecated = false
  @skip_docs = false
  # 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
  @executed_by_runner = 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 1309

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) ⇒ Object 



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# File 'lib/chef/resource.rb', line 871

def allowed_actions(value = NOT_PASSED)
  if value != NOT_PASSED
    self.allowed_actions = value
  end
  @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 1214

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 1242

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 861

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 461

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 1225

def enclosing_provider
  @enclosing_provider
end

#executed_by_runner ⇒ Boolean

Returns If the resource was executed by the runner.

Returns:

  • (Boolean) —

    If the resource was executed by the runner



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# File 'lib/chef/resource.rb', line 465

def executed_by_runner
  @executed_by_runner
end

#logger ⇒ Mixlib::Log::Child (readonly)

of the run context’s logger, if one exists.

Returns:

  • (Mixlib::Log::Child) —

    The logger for this resources. This is a child



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

def logger
  @logger
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 1199

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 1218

def recipe_name
  @recipe_name
end

#resource_initializing ⇒ 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.

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_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 1205

def run_context
  @run_context
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 1233

def source_line
  @source_line
end

#updated ⇒ Boolean (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.

Returns:

  • (Boolean) —

    Whether the resource was updated during an action.



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# File 'lib/chef/resource.rb', line 885

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.

Parameters:

  • name (Symbol) —

    The action name to define.

  • recipe_block —

    The recipe to run when the action is taken. This block takes no parameters, and will be evaluated in a new context containing:

    • The resource’s public and protected methods (including attributes)

    • The Chef Recipe DSL (file, etc.)

    • super() referring to the parent version of the action (if any)

Returns:

  • The Action class implementing the action



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# File 'lib/chef/resource.rb', line 1065

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 indicates 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 1122

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.

Parameters:

  • actions (Array<Symbol>) —

    The list of actions to add to allowed_actions.

Returns:

  • (Array<Symbol>) —

    The list of actions, as symbols.



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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

.chef_version_for_provides(constraint) ⇒ Object

This API can be used for backcompat to do:

chef_version_for_provides “< 14.0” if defined?(:chef_version_for_provides)

For core chef versions that do not support chef_version: in provides lines.

Since resource_name calls provides the generally correct way of doing this is to do ‘chef_version_for_provides` first, then `resource_name` and then any additional options `provides` lines.

Once we no longer care about supporting chef < 14.4 then we can deprecate this API.

Parameters:

  • arg (String) —

    version constrant to match against (e.g. “> 14”)



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# File 'lib/chef/resource.rb', line 1332

def self.chef_version_for_provides(constraint)
  @chef_version_for_provides = constraint
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.

Returns:

  • (Boolean) —

    if the resource is a custom_resource



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# File 'lib/chef/resource.rb', line 1132

def self.custom_resource?
  false
end

.declare_action_class ⇒ 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.

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 1152

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 automatically add the action to allowed_actions, if it isn’t already there.

Defaults to [:nothing].

Parameters:

  • action_name (Symbol, Array<Symbol>) (defaults to: NOT_PASSED) —

    The default action (or series of actions) to use.

Returns:

  • (Array<Symbol>) —

    The default actions for the resource.



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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 defined?(@default_action) && @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

.default_description(default_description = "NOT_PASSED") ⇒ Object 



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# File 'lib/chef/resource.rb', line 1457

def self.default_description(default_description = "NOT_PASSED")
  if default_description != "NOT_PASSED"
    @default_description = default_description
  end
  @default_description
end

.deprecated(deprecated = "NOT_PASSED") ⇒ Object 



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# File 'lib/chef/resource.rb', line 1442

def self.deprecated(deprecated = "NOT_PASSED")
  if deprecated != "NOT_PASSED"
    @deprecated = true
    @deprecated_message = deprecated
  end
  @deprecated
end

.description(description = "NOT_PASSED") ⇒ Object 



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# File 'lib/chef/resource.rb', line 1421

def self.description(description = "NOT_PASSED")
  if description != "NOT_PASSED"
    @description = description
  end
  @description
end

.examples(examples = "NOT_PASSED") ⇒ Object 



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# File 'lib/chef/resource.rb', line 1435

def self.examples(examples = "NOT_PASSED")
  if examples != "NOT_PASSED"
    @examples = examples
  end
  @examples
end

.from_hash(o) ⇒ Object 



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

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 730

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.

Parameters:

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

    The name of the property to set.

Returns:

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 841

def self.identity_attr(name = nil)
  property = identity_property(name)
  return nil unless 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`.

“‘ruby property :x, identity: true # part of identity property :y # not part of identity “`

Parameters:

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

    A list of property names to set as the identity.

Returns:

  • (Symbol) —

    The identity property if there is only one; or ‘nil` if there are more than one.

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 818

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(&:name).join(", ")})."
  end

  result.first
end

.inherited(child) ⇒ Object 



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# File 'lib/chef/resource.rb', line 1301

def self.inherited(child)
  super
  @@sorted_descendants = nil
end

.introduced(introduced = "NOT_PASSED") ⇒ Object 



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# File 'lib/chef/resource.rb', line 1428

def self.introduced(introduced = "NOT_PASSED")
  if introduced != "NOT_PASSED"
    @introduced = introduced
  end
  @introduced
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 1142

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 726

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.

Parameters:

  • load_block —

    The block to load. Will be run in the context of a newly created resource with its identity values filled in.



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# File 'lib/chef/resource.rb', line 1079

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

.preview_resource(value = nil) ⇒ Boolean

Set or return if this resource is in preview mode.

This only has value in the resource_inspector to mark a resource as being new-to-chef-core. Its meaning is probably more equivalent to “experimental” in that the API might change even in minor versions due to bugfixing and is NOT considered “stable” yet.

Parameters:

  • value (nil, Boolean) (defaults to: nil) —

    If nil, get the current value. If not nil, set the value of the flag.

Returns:

  • (Boolean) 


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# File 'lib/chef/resource.rb', line 1179

def self.preview_resource(value = nil)
  @preview_resource = false unless defined?(@preview_resource)
  @preview_resource = value unless value.nil?
  @preview_resource
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 1343

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

  # quell warnings
  @chef_version_for_provides = nil unless defined?(@chef_version_for_provides)

  # deliberately do not go through the accessor here
  @resource_name = name if resource_name.nil?

  if @chef_version_for_provides && !options.include?(:chef_version)
    options[:chef_version] = @chef_version_for_provides
  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

Returns:

  • (Boolean) 


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# File 'lib/chef/resource.rb', line 1361

def self.provides?(node, resource_name)
  Chef::ResourceResolver.new(node, resource_name).provided_by?(self)
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 1551

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<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 1573

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

.resource_name(name = NOT_PASSED) ⇒ Symbol

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

Call ‘resource_name nil` to remove the resource name

Parameters:

  • value (Symbol) —

    The desired name of this resource type (e.g. ‘execute`), or `nil` if this class is abstract and has no resource_name.

Returns:

  • (Symbol) —

    The name of this resource type (e.g. ‘:execute`).



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# File 'lib/chef/resource.rb', line 950

def self.resource_name(name = NOT_PASSED)
  # Setter
  if name != NOT_PASSED
    if name
      @resource_name = name.to_sym
      name = name.to_sym
      # FIXME: determine a way to deprecate this magic behavior
      unless Chef::ResourceResolver.includes_handler?(name, self)
        provides name
      end
    else
      @resource_name = nil
    end
  end

  @resource_name = nil unless defined?(@resource_name)
  @resource_name
end

.resource_name=(name) ⇒ Object 



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# File 'lib/chef/resource.rb', line 969

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

.skip_docs(skip_docs = "NOT_PASSED") ⇒ Object 



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# File 'lib/chef/resource.rb', line 1450

def self.skip_docs(skip_docs = "NOT_PASSED")
  if skip_docs != "NOT_PASSED"
    @skip_docs = skip_docs
  end
  @skip_docs
end

.sorted_descendants ⇒ Object 



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# File 'lib/chef/resource.rb', line 1297

def self.sorted_descendants
  @@sorted_descendants ||= descendants.sort_by(&: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`

“‘ruby 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`.

Parameters:

  • names (Array<Symbol>) —

    A list of property names to set as desired state.

Returns:

  • (Array<Symbol>) —

    All property names with desired state.



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# File 'lib/chef/resource.rb', line 790

def self.state_attrs(*names)
  state_properties(*names).map(&:name)
end

.unified_mode(flag = nil) ⇒ Boolean

If the resource’s action should run in separated compile/converge mode.

Parameters:

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

    value to set unified_mode to

Returns:

  • (Boolean) —

    unified_mode value



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# File 'lib/chef/resource.rb', line 977

def self.unified_mode(flag = nil)
  @unified_mode = Chef::Config[:resource_unified_mode_default] if !defined?(@unified_mode) || @unified_mode.nil?
  @unified_mode = flag unless flag.nil?
  !!@unified_mode
end

.use(partial) ⇒ Object

Use a partial code fragment. This can be used for code sharing between multiple resources.

Do not wrap the code fragment in a class or module. It also does not support the use of super to subclass any methods defined in the fragment, the methods will just be overwritten.

Parameters:

  • partial (String) —

    the code fragment to eval against the class



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# File 'lib/chef/resource.rb', line 1471

def self.use(partial)
  dirname = ::File.dirname(partial)
  basename = ::File.basename(partial, ".rb")
  basename = basename[1..-1] if basename.start_with?("_")
  class_eval IO.read(::File.expand_path("#{dirname}/_#{basename}.rb", ::File.dirname(caller_locations.first.absolute_path)))
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 153

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 assignment syntax.

Parameters:

  • arg (Array[Symbol], Symbol) —

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

Returns:

  • (Array[Symbol]) —

    the list of actions.



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# File 'lib/chef/resource.rb', line 169

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_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 936

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 682

def as_json(*a)
  safe_ivars = instance_variables.map(&:to_sym) - FORBIDDEN_IVARS
  instance_vars = {}
  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_notifications ⇒ Object 



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# File 'lib/chef/resource.rb', line 1379

def before_notifications
  run_context.before_notifications(self)
end

#compile_time ⇒ Boolean

If this is set the resource will be set to run at compile time and the converge time action will be set to :nothing.

Parameters:

  • arg (Boolean) —

    Whether or not to force this resource to run at compile time.

Returns:

  • (Boolean) —

    Whether or not to force this resource to run at compile time.



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

property :compile_time, [TrueClass, FalseClass],
description: "Determines whether or not the resource is executed during the compile time phase.",
default: false, desired_state: false

#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 1482

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

#current_value ⇒ Object

Get the current actual value of this resource.

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

Returns:

  • A new copy of the resource, with values filled in from the actual current value.



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# File 'lib/chef/resource.rb', line 1099

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 1088

def current_value_does_not_exist!
  raise Chef::Exceptions::CurrentValueDoesNotExist
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 1508

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 1512

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 1373

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 1407

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

Parameters:

  • arg (Array[Symbol], Symbol) —

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



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

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, run_context.unified_mode))
  end
end

#delayed_notifications ⇒ Object 



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# File 'lib/chef/resource.rb', line 1387

def delayed_notifications
  run_context.delayed_notifications(self)
end

#events ⇒ Object 



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# File 'lib/chef/resource.rb', line 1488

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 480

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, 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.

Returns:

  • (Object, Hash<Symbol,Object>) —

    The identity of this resource.



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# File 'lib/chef/resource.rb', line 517

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_failure ⇒ 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`. If set to `:quiet` or `’quiet’‘, the normal error trace will be suppressed.

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

Parameters:

  • arg (Boolean, String, Symbol) —

    Whether to ignore failures.

Returns:

  • Whether this resource will ignore failures.



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# File 'lib/chef/resource.rb', line 540

property :ignore_failure, [ true, false, :quiet, "quiet" ], default: false, desired_state: false

#immediate_notifications ⇒ Object 



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

def immediate_notifications
  run_context.immediate_notifications(self)
end

#inspect ⇒ Object 



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# File 'lib/chef/resource.rb', line 672

def inspect
  ivars = instance_variables.map(&: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.

Parameters:



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# File 'lib/chef/resource.rb', line 547

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 1578

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

#name ⇒ 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`.

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) —

    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 90

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

#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 99

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.

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 411

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

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).

    • ‘before`: Will run the action on the other resource immediately before the action is actually run.



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# File 'lib/chef/resource.rb', line 245

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 1263

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

#notifies_delayed(action, resource_spec) ⇒ Object

Helper for #notifies



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# File 'lib/chef/resource.rb', line 1273

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

#notifies_immediately(action, resource_spec) ⇒ Object

Helper for #notifies



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# File 'lib/chef/resource.rb', line 1268

def notifies_immediately(action, resource_spec)
  run_context.notifies_immediately(Notification.new(resource_spec, action, self, run_context.unified_mode))
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 381

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.

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.

See Also:



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# File 'lib/chef/resource.rb', line 757

def provider(arg = nil)
  klass = if arg.is_a?(String) || arg.is_a?(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 766

def provider=(arg)
  provider(arg)
end

#provider_for_action(action) ⇒ Object 



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# File 'lib/chef/resource.rb', line 1496

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_references(always_raise = false) ⇒ 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 1248

def resolve_notification_references(always_raise = false)
  run_context.before_notifications(self).each do |n|
    n.resolve_resource_reference(run_context.resource_collection, true)
  end

  run_context.immediate_notifications(self).each do |n|
    n.resolve_resource_reference(run_context.resource_collection, always_raise)
  end

  run_context.delayed_notifications(self).each do |n|
    n.resolve_resource_reference(run_context.resource_collection, always_raise)
  end
end

#resource_name ⇒ Symbol

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

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

Returns:

  • (Symbol) —

    The name of this resource type (e.g. ‘:execute`).



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# File 'lib/chef/resource.rb', line 928

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

#retries ⇒ 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) —

    The number of retries.

Returns:

  • (Integer) —

    The number of retries.



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

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

#retry_delay ⇒ Integer

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

Parameters:

  • arg (Integer) —

    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 434

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.

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 564

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] || logger.level == :debug
    # This can be noisy
    logger.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
      logger.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
      logger.info("Retrying execution of #{self}, #{remaining_retries} attempt#{"s" if remaining_retries > 1} 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

#sensitive ⇒ Boolean

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

Parameters:

  • arg (Boolean) —

    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 442

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

Returns:

  • (Boolean) 


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# File 'lib/chef/resource.rb', line 1528

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)
      logger.debug("Skipping #{self} due to #{conditional.description}")
      true
    end
  end
end

#source_line_file ⇒ Object 



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# File 'lib/chef/resource.rb', line 1391

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

#source_line_number ⇒ Object 



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# File 'lib/chef/resource.rb', line 1399

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

#state_for_resource_reporter ⇒ Hash{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).

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 497

def state_for_resource_reporter
  state = {}
  state_properties = self.class.state_properties
  state_properties.each do |property|
    if 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

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.

    • ‘before`: The action will run immediately before the other resource is updated.



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# File 'lib/chef/resource.rb', line 344

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

#suppress_up_to_date_messages? ⇒ Boolean

This is used to suppress the “(up to date)” message in the doc formatter for the log resource (where it is nonsensical).

This is not exactly a private API, but its doubtful there exist many other sane use cases for this.

Returns:

  • (Boolean) 


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# File 'lib/chef/resource.rb', line 1595

def suppress_up_to_date_messages?
  false
end

#to_h ⇒ Object Also known as: to_hash 



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

def to_h
  # 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(&:to_sym) - FORBIDDEN_IVARS
  safe_ivars.each do |iv|
    key = iv.to_s.sub(/^@/, "").to_sym
    next if result.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 695

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 633

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

#to_text ⇒ Object 



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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|
    begin
      all_props[p.name.to_s] = p.sensitive? ? '"*sensitive value suppressed*"' : value_to_text(p.get(self))
    rescue Chef::Exceptions::ValidationFailed
      # This space left intentionally blank, the property was probably required or had an invalid default.
    end
  end

  ivars = instance_variables.map(&: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.

Returns:

  • (Boolean) —

    Whether the resource was updated during an action.



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

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 906

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 917

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 1492

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 1366

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 668

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