Class: Chef::Provider::Env

Inherits:
Chef::Provider show all
Includes:
Mixin::Command
Defined in:
lib/chef/provider/env.rb,
lib/chef/provider/env/windows.rb

Direct Known Subclasses

Windows

Defined Under Namespace

Classes: Windows

Instance Attribute Summary collapse

Attributes inherited from Chef::Provider

#action, #current_resource, #new_resource, #run_context

Instance Method Summary collapse

Methods included from Mixin::Command

#chdir_or_tmpdir, #handle_command_failures, #output_of_command, #run_command, #run_command_with_systems_locale

Methods included from Mixin::Command::Windows

#popen4

Methods included from Mixin::Command::Unix

#popen4

Methods inherited from Chef::Provider

#action_nothing, #cleanup_after_converge, #cookbook_name, #define_resource_requirements, #events, #node, #process_resource_requirements, #requirements, #resource_collection, #run_action, #set_updated_status, #whyrun_mode?, #whyrun_supported?

Methods included from DSL::Recipe

#method_missing

Methods included from Mixin::ConvertToClassName

#convert_to_class_name, #convert_to_snake_case, #filename_to_qualified_string, #snake_case_basename

Constructor Details

#initialize(new_resource, run_context) ⇒ Env

Returns a new instance of Env.



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# File 'lib/chef/provider/env.rb', line 29

def initialize(new_resource, run_context)
  super
  @key_exists = true
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Chef::DSL::Recipe

Instance Attribute Details

#key_exists ⇒ Object

Returns the value of attribute key_exists.



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# File 'lib/chef/provider/env.rb', line 27

def key_exists
  @key_exists
end

Instance Method Details

#action_create ⇒ Object 



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# File 'lib/chef/provider/env.rb', line 72

def action_create
  if @key_exists
    if compare_value
      modify_env
      Chef::Log.info("#{@new_resource} altered")
      @new_resource.updated_by_last_action(true)
    end
  else
    create_env
    Chef::Log.info("#{@new_resource} created")
    @new_resource.updated_by_last_action(true)
  end
end

#action_delete ⇒ Object 



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# File 'lib/chef/provider/env.rb', line 115

def action_delete
  if @key_exists && !delete_element
    delete_env
    Chef::Log.info("#{@new_resource} deleted")
    @new_resource.updated_by_last_action(true)
  end
end

#action_modify ⇒ Object 



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# File 'lib/chef/provider/env.rb', line 123

def action_modify
  if @key_exists
    if compare_value
      modify_env
      Chef::Log.info("#{@new_resource} modified")
      @new_resource.updated_by_last_action(true)
    end
  else
    raise Chef::Exceptions::Env, "Cannot modify #{@new_resource} - key does not exist!"
  end
end

#compare_value ⇒ Object

Check to see if value needs any changes

Returns

<true>

If a change is required

<false>

If a change is not required



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# File 'lib/chef/provider/env.rb', line 61

def compare_value
  if @new_resource.delim
    #e.g. check for existing value within PATH
    not @current_resource.value.split(@new_resource.delim).any? do |val|
      val == @new_resource.value
    end
  else
    @new_resource.value != @current_resource.value
  end
end

#create_env ⇒ Object

Raises:



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# File 'lib/chef/provider/env.rb', line 135

def create_env
  raise Chef::Exceptions::UnsupportedAction, "#{self.to_s} does not support :#{@new_resource.action}"
end

#delete_element ⇒ Object

e.g. delete a PATH element

Returns

<true>

If we handled the element case and caller should not delete the key

<false>

Caller should delete the key, either no :delim was specific or value was empty after we removed the element.



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# File 'lib/chef/provider/env.rb', line 92

def delete_element
  return false unless @new_resource.delim #no delim: delete the key
  if compare_value
    Chef::Log.debug("#{@new_resource} element '#{@new_resource.value}' does not exist")
    return true #do not delete the key
  else
    new_value =
      @current_resource.value.split(@new_resource.delim).select { |item|
      item != @new_resource.value
    }.join(@new_resource.delim)

    if new_value.empty?
      return false #nothing left here, delete the key
    else
      old_value = @new_resource.value(new_value)
      create_env
      Chef::Log.debug("#{@new_resource} deleted #{old_value} element")
      @new_resource.updated_by_last_action(true)
      return true #we removed the element and updated; do not delete the key
    end
  end
end

#delete_env ⇒ Object

Raises:



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# File 'lib/chef/provider/env.rb', line 139

def delete_env
  raise Chef::Exceptions::UnsupportedAction, "#{self.to_s} does not support :delete"
end

#env_key_exists(key_name) ⇒ Object 



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# File 'lib/chef/provider/env.rb', line 52

def env_key_exists(key_name)
  env_value(key_name) ? true : false
end

#env_value(key_name) ⇒ Object

Raises:



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# File 'lib/chef/provider/env.rb', line 48

def env_value(key_name)
  raise Chef::Exceptions::Env, "#{self.to_s} provider does not implement env_value!"
end

#load_current_resource ⇒ Object 



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# File 'lib/chef/provider/env.rb', line 34

def load_current_resource
  @current_resource = Chef::Resource::Env.new(@new_resource.name)
  @current_resource.key_name(@new_resource.key_name)

  if env_key_exists(@new_resource.key_name)
    @current_resource.value(env_value(@new_resource.key_name))
  else
    @key_exists = false
    Chef::Log.debug("#{@new_resource} key does not exist")
  end

  @current_resource
end

#modify_env ⇒ Object 



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# File 'lib/chef/provider/env.rb', line 143

def modify_env
  if @new_resource.delim
    #e.g. add to PATH
    @new_resource.value << @new_resource.delim << @current_resource.value
  end
  create_env
end