Revert r42938 "* lib/rubygems: Update to RubyGems 2.1.3"

It breaks build.
20130913T200302Z.diff.html.gz

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42941 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/commands/uninstall_command.rb

@@ -1,6 +1,7 @@
 require 'rubygems/command'
 require 'rubygems/version_option'
 require 'rubygems/uninstaller'
+require 'fileutils'
 
 ##
 # Gem uninstaller command line tool
@@ -14,7 +15,7 @@ class Gem::Commands::UninstallCommand < Gem::Command
   def initialize
     super 'uninstall', 'Uninstall gems from the local repository',
           :version => Gem::Requirement.default, :user_install => true,
-          :check_dev => false
+          :install_dir => Gem.dir, :check_dev => false
 
     add_option('-a', '--[no-]all',
       'Uninstall all matching versions'
@@ -67,6 +68,12 @@ class Gem::Commands::UninstallCommand < Gem::Command
       options[:force] = value
     end
 
+    add_option('--[no-]abort-on-dependent',
+               'Prevent uninstalling gems that are',
+               'depended on by other gems.') do |value, options|
+      options[:abort_on_dependent] = value
+    end
+
     add_version_option
     add_platform_option
   end
@@ -81,13 +88,49 @@ class Gem::Commands::UninstallCommand < Gem::Command
     "--user-install"
   end
 
+  def description # :nodoc:
+    <<-EOF
+The uninstall command removes a previously installed gem.
+
+RubyGems will ask for confirmation if you are attempting to uninstall a gem
+that is a dependency of an existing gem.  You can use the
+--ignore-dependencies option to skip this check.
+    EOF
+  end
+
   def usage # :nodoc:
     "#{program_name} GEMNAME [GEMNAME ...]"
   end
 
   def execute
-    # REFACTOR: stolen from cleanup_command
+    if options[:all] and not options[:args].empty? then
+      alert_error 'Gem names and --all may not be used together'
+      terminate_interaction 1
+    elsif options[:all] then
+      uninstall_all
+    else
+      uninstall_specific
+    end
+  end
+
+  def uninstall_all
+    _, specs = Gem::Specification.partition { |spec| spec.default_gem? }
+
+    specs.each do |spec|
+      options[:version] = spec.version
+
+      begin
+        Gem::Uninstaller.new(spec.name, options).uninstall
+      rescue Gem::InstallError
+      end
+    end
+
+    alert "Uninstalled all gems in #{options[:install_dir]}"
+  end
+
+  def uninstall_specific
     deplist = Gem::DependencyList.new
+
     get_all_gem_names.uniq.each do |name|
       Gem::Specification.find_all_by_name(name).each do |spec|
         deplist.add spec