instance method install_using_git

# File railties/lib/rails/commands/plugin.rb, line 231
    def install_using_git(options = {})
      root = rails_env.root
      mkdir_p(install_path = "#{root}/vendor/plugins/#{name}")
      Dir.chdir install_path do
        init_cmd = "git init"
        init_cmd += " -q" if options[:quiet] and not $verbose
        puts init_cmd if $verbose
        system(init_cmd)
        base_cmd = "git pull --depth 1 #{uri}"
        base_cmd += " -q" if options[:quiet] and not $verbose
        base_cmd += " #{options[:revision]}" if options[:revision]
        puts base_cmd if $verbose
        if system(base_cmd)
          puts "removing: .git .gitignore" if $verbose
          rm_rf %w(.git .gitignore)
        else
          rm_rf install_path
        end
      end
    end