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diff --git a/jni/ruby/lib/rubygems/commands/generate_index_command.rb b/jni/ruby/lib/rubygems/commands/generate_index_command.rb
new file mode 100644
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+++ b/jni/ruby/lib/rubygems/commands/generate_index_command.rb
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+require 'rubygems/command'
+require 'rubygems/indexer'
+
+##
+# Generates a index files for use as a gem server.
+#
+# See `gem help generate_index`
+
+class Gem::Commands::GenerateIndexCommand < Gem::Command
+
+  def initialize
+    super 'generate_index',
+          'Generates the index files for a gem server directory',
+          :directory => '.', :build_modern => true
+
+    add_option '-d', '--directory=DIRNAME',
+               'repository base dir containing gems subdir' do |dir, options|
+      options[:directory] = File.expand_path dir
+    end
+
+    add_option '--[no-]modern',
+               'Generate indexes for RubyGems',
+               '(always true)' do |value, options|
+      options[:build_modern] = value
+    end
+
+    add_option '--update',
+               'Update modern indexes with gems added',
+               'since the last update' do |value, options|
+      options[:update] = value
+    end
+  end
+
+  def defaults_str # :nodoc:
+    "--directory . --modern"
+  end
+
+  def description # :nodoc:
+    <<-EOF
+The generate_index command creates a set of indexes for serving gems
+statically.  The command expects a 'gems' directory under the path given to
+the --directory option.  The given directory will be the directory you serve
+as the gem repository.
+
+For `gem generate_index --directory /path/to/repo`, expose /path/to/repo via
+your HTTP server configuration (not /path/to/repo/gems).
+
+When done, it will generate a set of files like this:
+
+  gems/*.gem                                   # .gem files you want to
+                                               # index
+
+  specs.<version>.gz                           # specs index
+  latest_specs.<version>.gz                    # latest specs index
+  prerelease_specs.<version>.gz                # prerelease specs index
+  quick/Marshal.<version>/<gemname>.gemspec.rz # Marshal quick index file
+
+The .rz extension files are compressed with the inflate algorithm.
+The Marshal version number comes from ruby's Marshal::MAJOR_VERSION and
+Marshal::MINOR_VERSION constants.  It is used to ensure compatibility.
+    EOF
+  end
+
+  def execute
+    # This is always true because it's the only way now.
+    options[:build_modern] = true
+
+    if not File.exist?(options[:directory]) or
+       not File.directory?(options[:directory]) then
+      alert_error "unknown directory name #{directory}."
+      terminate_interaction 1
+    else
+      indexer = Gem::Indexer.new options.delete(:directory), options
+
+      if options[:update] then
+        indexer.update_index
+      else
+        indexer.generate_index
+      end
+    end
+  end
+
+end
+