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#
# Author:: Doug MacEachern (<dougm@vmware.com>)
# Copyright:: Copyright (c) 2010 VMware, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'chef/provider'
require 'chef/mixin/command'
require 'chef/resource/env'
class Chef
class Provider
class Env < Chef::Provider
include Chef::Mixin::Command
attr_accessor :key_exists
def initialize(new_resource, run_context)
super
@key_exists = true
end
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
def env_value(key_name)
raise Chef::Exceptions::Env, "#{self.to_s} provider does not implement env_value!"
end
def env_key_exists(key_name)
env_value(key_name) ? true : false
end
# Check to see if value needs any changes
#
# ==== Returns
# <true>:: If a change is required
# <false>:: If a change is not required
def requires_modify_or_create?
if @new_resource.delim
#e.g. check for existing value within PATH
new_values.inject(0) do |index, val|
next_index = current_values.find_index val
return true if next_index.nil? || next_index < index
next_index
end
false
else
@new_resource.value != @current_resource.value
end
end
alias_method :compare_value, :requires_modify_or_create?
def action_create
if @key_exists
if requires_modify_or_create?
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
#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.
def delete_element
return false unless @new_resource.delim #no delim: delete the key
needs_delete = new_values.any? { |v| current_values.include?(v) }
if !needs_delete
Chef::Log.debug("#{@new_resource} element '#{@new_resource.value}' does not exist")
return true #do not delete the key
else
new_value =
current_values.select { |item|
not new_values.include?(item)
}.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
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
def action_modify
if @key_exists
if requires_modify_or_create?
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
def create_env
raise Chef::Exceptions::UnsupportedAction, "#{self.to_s} does not support :#{@new_resource.action}"
end
def delete_env
raise Chef::Exceptions::UnsupportedAction, "#{self.to_s} does not support :delete"
end
def modify_env
if @new_resource.delim
@new_resource.value((new_values + current_values).uniq.join(@new_resource.delim))
end
create_env
end
# Returns the current values to split by delimiter
def current_values
@current_values ||= @current_resource.value.split(@new_resource.delim)
end
# Returns the new values to split by delimiter
def new_values
@new_values ||= @new_resource.value.split(@new_resource.delim)
end
end
end
end
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