Remove extlib dependency, copy mash code into sources, fix CHEF-1405

Including extlib in Chef introduces conflicts for those wanting to
access Chef via Rails applications.  Only the Mash class is used by Chef
and this functionality has been extracted from the extlib gem and added
to the Chef sources.

Thanks to Wojciech Wntrzak and Aaron Suggs for proposing and testing
this solution.

14 files changed, 228 insertions, 13 deletions

diff --git a/NOTICE b/NOTICE
index 04c07d8309..b4ea2ccbee 100644
--- a/NOTICE
+++ b/NOTICE
@@ -19,3 +19,9 @@ Chef incorporates code modified from Open4 (http://www.codeforpeople.com/lib/rub
 Chef incorporates code modified from Merb (http://www.merbivore.com), which is Copyright (c) 2008 Engine Yard.
 
 Chef incorporates code modified from deep_merge (http://trac.misuse.org/science/wiki/DeepMerge), which is Copyright (c) 2008 Steve Midgley
+
+Chef incorporates code modified from extlib
+(http://github.com/datamapper/extlib), which is Copyright 2009 Dan
+Kubb with some portions of mash.rb being verbatim copies of software
+licensed under the MIT license and Copyright 2005-2008 David
+Heinemeier Hansson
diff --git a/chef-server-api/README.rdoc b/chef-server-api/README.rdoc
index 017d536dbf..e2daaf7ff7 100644
--- a/chef-server-api/README.rdoc
+++ b/chef-server-api/README.rdoc
@@ -15,7 +15,6 @@ chef:
 *  ruby-openid  
 *  json  
 *  erubis  
-*  extlib  
 *  stomp  
 *  ohai  
 
diff --git a/chef-server-api/config/router.rb b/chef-server-api/config/router.rb
index a74238a839..7f9e701b87 100644
--- a/chef-server-api/config/router.rb
+++ b/chef-server-api/config/router.rb
@@ -135,7 +135,7 @@ Merb::Router.prepare do
               # Call Chef's JSON utility instead of the default in Merb,
               # JSON.parse.
               jobj = Chef::JSONCompat.from_json(raw_post)
-              jobj = jobj.to_mash if jobj.is_a?(Hash)
+              jobj = Mash.from_hash(jobj) if jobj.is_a?(Hash)
             rescue JSON::ParserError
               jobj = Mash.new
             end
diff --git a/chef/README.rdoc b/chef/README.rdoc
index 80ee9c9cca..cc28dd0991 100644
--- a/chef/README.rdoc
+++ b/chef/README.rdoc
@@ -44,7 +44,6 @@ Install these via your platform's preferred method; for example apt, yum, ports,
 * ohai
 * bunny
 * erubis
-* extlib
 * highline
 * json (1.4.4 - 1.4.6)
 * mixlib-authentication
diff --git a/chef/chef.gemspec b/chef/chef.gemspec
index bb087c3679..3fec1c9ba9 100644
--- a/chef/chef.gemspec
+++ b/chef/chef.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
   s.add_dependency "bunny", ">= 0.6.0"
   s.add_dependency "json", ">= 1.4.4", "<= 1.4.6"
   s.add_dependency "treetop", "~> 1.4.9"
-  %w{erubis extlib moneta highline uuidtools}.each { |gem| s.add_dependency gem }
+  %w{erubis moneta highline uuidtools}.each { |gem| s.add_dependency gem }
 
   s.bindir       = "bin"
   s.executables  = %w( chef-client chef-solo knife shef )
diff --git a/chef/lib/chef.rb b/chef/lib/chef.rb
index a9431c1889..3218fb2b37 100644
--- a/chef/lib/chef.rb
+++ b/chef/lib/chef.rb
@@ -18,7 +18,7 @@
 
 require 'chef/version'
 require 'chef/nil_argument'
-require 'extlib'
+require 'chef/mash'
 require 'chef/exceptions'
 require 'chef/log'
 require 'chef/config'
@@ -37,4 +37,4 @@ require 'chef/handler/json_file'
 require 'chef/monkey_patches/tempfile'
 require 'chef/monkey_patches/dir'
 require 'chef/monkey_patches/string'
-require 'chef/monkey_patches/numeric'
\ No newline at end of file
+require 'chef/monkey_patches/numeric'
diff --git a/chef/lib/chef/api_client.rb b/chef/lib/chef/api_client.rb
index 184b965b80..a202bccb27 100644
--- a/chef/lib/chef/api_client.rb
+++ b/chef/lib/chef/api_client.rb
@@ -23,7 +23,7 @@ require 'chef/mixin/from_file'
 require 'chef/couchdb'
 require 'chef/certificate'
 require 'chef/index_queue'
-require 'extlib'
+require 'chef/mash'
 require 'chef/json_compat'
 
 class Chef
diff --git a/chef/lib/chef/cookbook/cookbook_collection.rb b/chef/lib/chef/cookbook/cookbook_collection.rb
index 16d85e389a..c4b05d5ea0 100644
--- a/chef/lib/chef/cookbook/cookbook_collection.rb
+++ b/chef/lib/chef/cookbook/cookbook_collection.rb
@@ -17,7 +17,7 @@
 # limitations under the License.
 #
 
-require 'extlib'
+require 'chef/mash'
 
 class Chef
   # == Chef::CookbookCollection
diff --git a/chef/lib/chef/data_bag.rb b/chef/lib/chef/data_bag.rb
index 7ba0944d4c..c0342f8437 100644
--- a/chef/lib/chef/data_bag.rb
+++ b/chef/lib/chef/data_bag.rb
@@ -24,7 +24,7 @@ require 'chef/mixin/from_file'
 require 'chef/couchdb'
 require 'chef/data_bag_item'
 require 'chef/index_queue'
-require 'extlib'
+require 'chef/mash'
 require 'chef/json_compat'
 
 class Chef
diff --git a/chef/lib/chef/data_bag_item.rb b/chef/lib/chef/data_bag_item.rb
index 4d311ebfa9..1f23d5d750 100644
--- a/chef/lib/chef/data_bag_item.rb
+++ b/chef/lib/chef/data_bag_item.rb
@@ -26,7 +26,7 @@ require 'chef/mixin/from_file'
 require 'chef/couchdb'
 require 'chef/index_queue'
 require 'chef/data_bag'
-require 'extlib'
+require 'chef/mash'
 require 'chef/json_compat'
 
 class Chef
diff --git a/chef/lib/chef/mash.rb b/chef/lib/chef/mash.rb
new file mode 100644
index 0000000000..368d806ba1
--- /dev/null
+++ b/chef/lib/chef/mash.rb
@@ -0,0 +1,211 @@
+# Copyright (c) 2009 Dan Kubb
+
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# ---
+# ---
+
+# Some portions of blank.rb and mash.rb are verbatim copies of software
+# licensed under the MIT license. That license is included below:
+
+# Copyright (c) 2005-2008 David Heinemeier Hansson
+
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# This class has dubious semantics and we only have it so that people can write
+# params[:key] instead of params['key'].
+class Mash < Hash
+
+  # @param constructor<Object>
+  #   The default value for the mash. Defaults to an empty hash.
+  #
+  # @details [Alternatives]
+  #   If constructor is a Hash, a new mash will be created based on the keys of
+  #   the hash and no default value will be set.
+  def initialize(constructor = {})
+    if constructor.is_a?(Hash)
+      super()
+      update(constructor)
+    else
+      super(constructor)
+    end
+  end
+
+  # @param key<Object> The default value for the mash. Defaults to nil.
+  #
+  # @details [Alternatives]
+  #   If key is a Symbol and it is a key in the mash, then the default value will
+  #   be set to the value matching the key.
+  def default(key = nil)
+    if key.is_a?(Symbol) && include?(key = key.to_s)
+      self[key]
+    else
+      super
+    end
+  end
+
+  alias_method :regular_writer, :[]= unless method_defined?(:regular_writer)
+  alias_method :regular_update, :update unless method_defined?(:regular_update)
+
+  # @param key<Object> The key to set.
+  # @param value<Object>
+  #   The value to set the key to.
+  #
+  # @see Mash#convert_key
+  # @see Mash#convert_value
+  def []=(key, value)
+    regular_writer(convert_key(key), convert_value(value))
+  end
+
+  # @param other_hash<Hash>
+  #   A hash to update values in the mash with. The keys and the values will be
+  #   converted to Mash format.
+  #
+  # @return [Mash] The updated mash.
+  def update(other_hash)
+    other_hash.each_pair { |key, value| regular_writer(convert_key(key), convert_value(value)) }
+    self
+  end
+
+  alias_method :merge!, :update
+
+  # @param key<Object> The key to check for. This will be run through convert_key.
+  #
+  # @return [Boolean] True if the key exists in the mash.
+  def key?(key)
+    super(convert_key(key))
+  end
+
+  # def include? def has_key? def member?
+  alias_method :include?, :key?
+  alias_method :has_key?, :key?
+  alias_method :member?, :key?
+
+  # @param key<Object> The key to fetch. This will be run through convert_key.
+  # @param *extras<Array> Default value.
+  #
+  # @return [Object] The value at key or the default value.
+  def fetch(key, *extras)
+    super(convert_key(key), *extras)
+  end
+
+  # @param *indices<Array>
+  #   The keys to retrieve values for. These will be run through +convert_key+.
+  #
+  # @return [Array] The values at each of the provided keys
+  def values_at(*indices)
+    indices.collect {|key| self[convert_key(key)]}
+  end
+
+  # @param hash<Hash> The hash to merge with the mash.
+  #
+  # @return [Mash] A new mash with the hash values merged in.
+  def merge(hash)
+    self.dup.update(hash)
+  end
+
+  # @param key<Object>
+  #   The key to delete from the mash.\
+  def delete(key)
+    super(convert_key(key))
+  end
+
+  # @param *rejected<Array[(String, Symbol)] The mash keys to exclude.
+  #
+  # @return [Mash] A new mash without the selected keys.
+  #
+  # @example
+  #   { :one => 1, :two => 2, :three => 3 }.except(:one)
+  #     #=> { "two" => 2, "three" => 3 }
+  def except(*keys)
+    super(*keys.map {|k| convert_key(k)})
+  end
+
+  # Used to provide the same interface as Hash.
+  #
+  # @return [Mash] This mash unchanged.
+  def stringify_keys!; self end
+
+  # @return [Hash] The mash as a Hash with symbolized keys.
+  def symbolize_keys
+    h = Hash.new(default)
+    each { |key, val| h[key.to_sym] = val }
+    h
+  end
+
+  # @return [Hash] The mash as a Hash with string keys.
+  def to_hash
+    Hash.new(default).merge(self)
+  end
+
+  # @return [Mash] Convert a Hash into a Mash
+  # The input Hash's default value is maintained
+  def self.from_hash(hash)
+    mash = Mash.new(hash)
+    mash.default = hash.default
+    mash
+  end
+
+  protected
+  # @param key<Object> The key to convert.
+  #
+  # @param [Object]
+  #   The converted key. If the key was a symbol, it will be converted to a
+  #   string.
+  #
+  # @api private
+  def convert_key(key)
+    key.kind_of?(Symbol) ? key.to_s : key
+  end
+
+  # @param value<Object> The value to convert.
+  #
+  # @return [Object]
+  #   The converted value. A Hash or an Array of hashes, will be converted to
+  #   their Mash equivalents.
+  #
+  # @api private
+  def convert_value(value)
+    if value.class == Hash
+      Mash.from_hash(value)
+    elsif value.is_a?(Array)
+      value.collect { |e| convert_value(e) }
+    else
+      value
+    end
+  end
+end
diff --git a/chef/lib/chef/node.rb b/chef/lib/chef/node.rb
index 0d93aba091..c390ea7cbb 100644
--- a/chef/lib/chef/node.rb
+++ b/chef/lib/chef/node.rb
@@ -33,7 +33,7 @@ require 'chef/rest'
 require 'chef/run_list'
 require 'chef/node/attribute'
 require 'chef/index_queue'
-require 'extlib'
+require 'chef/mash'
 require 'chef/json_compat'
 
 class Chef
diff --git a/chef/lib/chef/role.rb b/chef/lib/chef/role.rb
index 0227b2822e..28ef2aac2a 100644
--- a/chef/lib/chef/role.rb
+++ b/chef/lib/chef/role.rb
@@ -24,7 +24,7 @@ require 'chef/mixin/from_file'
 require 'chef/couchdb'
 require 'chef/run_list'
 require 'chef/index_queue'
-require 'extlib'
+require 'chef/mash'
 require 'chef/json_compat'
 
 class Chef
diff --git a/chef/lib/chef/run_list/run_list_expansion.rb b/chef/lib/chef/run_list/run_list_expansion.rb
index 37d5dd36d7..7323dba7be 100644
--- a/chef/lib/chef/run_list/run_list_expansion.rb
+++ b/chef/lib/chef/run_list/run_list_expansion.rb
@@ -15,7 +15,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require 'extlib'
+require 'chef/mash'
 
 require 'chef/mixin/deep_merge'