Module: Chef::Mixin::Properties::ClassMethods

Defined in:
lib/chef/mixin/properties.rb

Instance Method Summary collapse

Instance Method Details

#identity_properties(*names) ⇒ Array<Property>

Set the identity of this resource to a particular set of properties.

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 “`

If no properties are marked as identity, “name” is considered the identity.



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# File 'lib/chef/mixin/properties.rb', line 239

def identity_properties(*names)
  if !names.empty?
    names = names.map { |name| name.to_sym }

    # Add or change properties that are not part of the identity.
    names.each do |name|
      property = properties[name]
      if !property
        self.property name, instance_variable_name: false, identity: true
      elsif !property.identity?
        self.property name, identity: true
      end
    end

    # If identity_properties *excludes* something which is currently part of
    # the identity, mark it as identity: false.
    properties.each do |name, property|
      if property.identity? && !names.include?(name)

        self.property name, identity: false
      end
    end
  end

  result = properties.values.select { |property| property.identity? }
  result = [ properties[:name] ] if result.empty?
  result
end

#included(other) ⇒ Object 



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# File 'lib/chef/mixin/properties.rb', line 268

def included(other)
  other.extend ClassMethods
end

#lazy(&block) ⇒ Chef::DelayedEvaluator

Create a lazy value for assignment to a default value.



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# File 'lib/chef/mixin/properties.rb', line 157

def lazy(&block)
  DelayedEvaluator.new(&block)
end

#properties(include_superclass = true) ⇒ Hash<Symbol,Property>

The list of properties defined on this resource.

Everything defined with property is in this list.



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# File 'lib/chef/mixin/properties.rb', line 20

def properties(include_superclass = true)
  if include_superclass
    result = {}
    ancestors.reverse_each { |c| result.merge!(c.properties(false)) if c.respond_to?(:properties) }
    result
  else
    @properties ||= {}
  end
end

#property(name, type = NOT_PASSED, **options) ⇒ Object

Create a property on this resource class.

If a superclass has this property, or if this property has already been defined by this resource, this will override the previous value.

Examples:

Bare property

property :x

With just a type

property :x, String

With just options

property :x, default: 'hi'

With type and options

property :x, String, default: 'hi'


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# File 'lib/chef/mixin/properties.rb', line 98

def property(name, type = NOT_PASSED, **options)
  name = name.to_sym

  options = options.inject({}) { |memo, (key, value)| memo[key.to_sym] = value; memo }

  options[:instance_variable_name] = :"@#{name}" if !options.has_key?(:instance_variable_name)
  options[:name] = name
  options[:declared_in] = self

  if type == NOT_PASSED
    # If a type is not passed, the property derives from the
    # superclass property (if any)
    if properties.has_key?(name)
      property = properties[name].derive(**options)
    else
      property = property_type(**options)
    end

  # If a Property is specified, derive a new one from that.
  elsif type.is_a?(Property) || (type.is_a?(Class) && type <= Property)
    property = type.derive(**options)

  # If a primitive type was passed, combine it with "is"
  else
    if options[:is]
      options[:is] = ([ type ] + [ options[:is] ]).flatten(1)
    else
      options[:is] = type
    end
    property = property_type(**options)
  end

  local_properties = properties(false)
  local_properties[name] = property

  property.emit_dsl
end

#property_type(**options) ⇒ Object

Create a reusable property type that can be used in multiple properties in different resources.

Examples:

property_type(default: 'hi')


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# File 'lib/chef/mixin/properties.rb', line 146

def property_type(**options)
  Property.derive(**options)
end

#state_properties(*names) ⇒ Array<Property>

Get or set the list of desired state properties for this resource.

State properties are properties that describe the desired state of the system, such as file permissions or ownership. In general, state properties are properties 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, properties that are not “state properties” 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.

This method is unnecessary when declaring 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 “`



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# File 'lib/chef/mixin/properties.rb', line 190

def state_properties(*names)
  if !names.empty?
    names = names.map { |name| name.to_sym }.uniq

    local_properties = properties(false)
    # Add new properties to the list.
    names.each do |name|
      property = properties[name]
      if !property
        self.property name, instance_variable_name: false, desired_state: true
      elsif !property.desired_state?
        self.property name, desired_state: true
      end
    end

    # If state_attrs *excludes* something which is currently desired state,
    # mark it as desired_state: false.
    local_properties.each do |name, property|
      if property.desired_state? && !names.include?(name)
        self.property name, desired_state: false
      end
    end
  end

  properties.values.select { |property| property.desired_state? }
end