Module: Kitchen::Configurable::ClassMethods

Defined in:
lib/kitchen/configurable.rb

Overview

Class methods which will be mixed in on inclusion of Configurable module.

Instance Method Summary collapse

Instance Method Details

#default_config(attr, value = nil) {|object| ... } ⇒ Object

Sets a sane default value for a configuration attribute. These values can be overridden by provided configuration or in a subclass with another default_config declaration.

Examples:

a nil default value


default_config :i_am_nil

a primitive default value


default_config :use_sudo, true

a block to compute a default value


default_config :box_name do |subject|
  subject.instance.platform.name
end

Parameters:

  • attr (String) —

    configuration attribute name

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

    static default value for attribute

Yield Parameters:

  • object (Object) —

    a reference to the instantiated object

Yield Returns:

  • (Object, nil) —

    dynamically computed value for the attribute



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# File 'lib/kitchen/configurable.rb', line 192

def default_config(attr, value = nil, &block)
  defaults[attr] = block_given? ? block : value
end

#defaults ⇒ Hash

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.

Returns a hash of attribute keys and default values which has been merged with any superclass defaults.

Returns:

  • (Hash) —

    a hash of attribute keys and default values which has been merged with any superclass defaults



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# File 'lib/kitchen/configurable.rb', line 261

def defaults
  @defaults ||= Hash.new.merge(super_defaults)
end

#expand_path_for(attr, value = true) {|object| ... } ⇒ Object

Ensures that an attribute which is a path will be fully expanded at the right time. This helps make the configuration unambiguous and much easier to debug and diagnose.

Note that the file path expansion is only intended for paths on the local workstation invking the Test Kitchen code.

Examples:

the default usage


expand_path_for :data_path

disabling path expansion with a falsey value


expand_path_for :relative_path, false

using a block to determine whether or not to expand


expand_path_for :relative_or_not_path do |subject|
  subject.instance.name =~ /default/
end

Parameters:

  • attr (String) —

    configuration attribute name

  • value (Object, nil) (defaults to: true) —

    whether or not to exand the file path

Yield Parameters:

  • object (Object) —

    a reference to the instantiated object

Yield Returns:

  • (Object, nil) —

    dynamically compute whether or not to perform the file expansion



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# File 'lib/kitchen/configurable.rb', line 222

def expand_path_for(attr, value = true, &block)
  expanded_paths[attr] = block_given? ? block : value
end

#expanded_paths ⇒ Hash

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.

Returns a hash of attribute keys and truthy/falsey values to determine if said attribute needs to be fully file path expanded, which has been merged with any superclass expanded paths.

Returns:

  • (Hash) —

    a hash of attribute keys and truthy/falsey values to determine if said attribute needs to be fully file path expanded, which has been merged with any superclass expanded paths



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# File 'lib/kitchen/configurable.rb', line 280

def expanded_paths
  @expanded_paths ||= Hash.new.merge(super_expanded_paths)
end

#required_config(attr) {|attr, value, object| ... } ⇒ Object

Ensures that an attribute must have a non-nil, non-empty String value. The default behavior will be to raise a user error and thereby halting further configuration processing. Good use cases for require_config might be cloud provider credential keys and other similar data.

Examples:

a value that must not be nil or an empty String


required_config :cloud_api_token

using a block to use custom validation logic


required_config :email do |attr, value, subject|
  raise UserError, "Must be an email address" unless value =~ /@/
end

Parameters:

  • attr (String) —

    configuration attribute name

Yield Parameters:

  • attr (Symbol) —

    the attribute name

  • value (Object) —

    the current value of the attribute

  • object (Object) —

    a reference to the instantiated object



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# File 'lib/kitchen/configurable.rb', line 245

def required_config(attr, &block)
  if !block_given?
    klass = self
    block = lambda do |_, value, thing|
      if value.nil? || value.to_s.empty?
        attribute = "#{klass}#{thing.instance.to_str}#config[:#{attr}]"
        raise UserError, "#{attribute} cannot be blank"
      end
    end
  end
  validations[attr] = block
end

#super_defaults ⇒ Hash

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.

Returns a hash of defaults from the included class' superclass if defined in the superclass, or an empty hash otherwise.

Returns:

  • (Hash) —

    a hash of defaults from the included class' superclass if defined in the superclass, or an empty hash otherwise



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# File 'lib/kitchen/configurable.rb', line 268

def super_defaults
  if superclass.respond_to?(:defaults)
    superclass.defaults
  else
    Hash.new
  end
end

#super_expanded_paths ⇒ Hash

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.

Returns a hash of expanded paths from the included class' superclass if defined in the superclass, or an empty hash otherwise.

Returns:

  • (Hash) —

    a hash of expanded paths from the included class' superclass if defined in the superclass, or an empty hash otherwise



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# File 'lib/kitchen/configurable.rb', line 287

def super_expanded_paths
  if superclass.respond_to?(:expanded_paths)
    superclass.expanded_paths
  else
    Hash.new
  end
end

#super_validations ⇒ Hash

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.

Returns a hash of validations from the included class' superclass if defined in the superclass, or an empty hash otherwise.

Returns:

  • (Hash) —

    a hash of validations from the included class' superclass if defined in the superclass, or an empty hash otherwise



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# File 'lib/kitchen/configurable.rb', line 305

def super_validations
  if superclass.respond_to?(:validations)
    superclass.validations
  else
    Hash.new
  end
end

#validations ⇒ Hash

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.

Returns a hash of attribute keys and valudation callable blocks which has been merged with any superclass valudations.

Returns:

  • (Hash) —

    a hash of attribute keys and valudation callable blocks which has been merged with any superclass valudations



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# File 'lib/kitchen/configurable.rb', line 298

def validations
  @validations ||= Hash.new.merge(super_validations)
end