[Subversion] Minor improvements.

lib/cocoapods/downloader/subversion.rb

@@ -6,17 +6,23 @@ module Pod
       def download
         if options[:revision]
           download_revision
+        elsif options[:tag]
+          download_tag
         else
           download_head
         end
       end
 
       def download_head
-        svn "checkout \"#{url}\" \"#{target_path}\""
+        svn %|checkout "#{url}/#{options[:folder]}" "#{target_path}"|
       end
 
       def download_revision
-        svn "checkout \"#{url}\" -r '#{options[:revision]}' \"#{target_path}\""
+        svn %|checkout "#{url}/#{options[:folder]}" -r "#{options[:revision]}" "#{target_path}"|
+      end
+
+      def download_tag
+        svn %|checkout "#{url}/tags/#{options[:tag]}/#{options[:folder]}" "#{target_path}"|
       end
     end
   end

spec/functional/downloader_spec.rb

@@ -264,7 +264,7 @@ module Pod
 
       it "check's out a specific tag" do
         @pod.top_specification.stubs(:source).returns(
-          :svn => "file://#{fixture('subversion-repo')}/tags/tag-1"
+          :svn => "file://#{fixture('subversion-repo')}", :tag => 'tag-1'
         )
         downloader = Downloader.for_pod(@pod)
         downloader.download