escape commas in paths before globbing to avoid infinite hang in Dir[]

activesupport/lib/active_support/file_update_checker.rb

@@ -106,11 +106,15 @@ def compile_glob(hash) #:nodoc:
 
       globs = []
       hash.each do |key, value|
-        globs << "#{key}/**/*#{compile_ext(value)}"
+        globs << "#{escape(key)}/**/*#{compile_ext(value)}"
       end
       "{#{globs.join(",")}}"
     end
 
+    def escape(key)
+      key.gsub(',','\,')
+    end
+
     def compile_ext(array) #:nodoc:
       array = Array(array)
       return if array.empty?

activesupport/test/file_update_checker_test.rb

 require 'abstract_unit'
 require 'fileutils'
+require 'thread'
 
 MTIME_FIXTURES_PATH = File.expand_path("../fixtures", __FILE__)
 
@@ -79,4 +80,18 @@ def test_should_not_invoke_the_block_if_a_watched_dir_changed_its_glob
     assert !checker.execute_if_updated
     assert_equal 0, i
   end
+
+  def test_should_not_block_if_a_strange_filename_used
+    FileUtils.mkdir_p("tmp_watcher/valid,yetstrange,path,")
+    FileUtils.touch(FILES.map { |file_name| "tmp_watcher/valid,yetstrange,path,/#{file_name}" } )
+
+    test = Thread.new do
+      checker = ActiveSupport::FileUpdateChecker.new([],"tmp_watcher/valid,yetstrange,path," => :txt){ i += 1 }
+      Thread.exit
+    end
+    test.priority = -1
+    test.join(5)
+
+    assert !test.alive?
+  end
 end