Must ensure that the lock is always removed.

lib/gitosis.rb

@@ -27,15 +27,18 @@ class Gitosis
   def configure
     status = Timeout::timeout(20) do
       File.open(File.join(Dir.tmpdir,"gitlabhq-gitosis.lock"), "w+") do |f|
+        begin
           f.flock(File::LOCK_EX)
 
           pull
           yield(self)
           push
 
+        ensure
           f.flock(File::LOCK_UN)
         end
       end
+    end
   rescue Exception => ex
     raise Gitosis::AccessDenied.new("gitosis timeout")
   end