Enforce umask to be 022

This is needed to make umask 022 when fluentd is daemonized.

lib/droonga/slice.rb

@@ -58,6 +58,7 @@ def process(message)
 
     private
     def ensure_database
+      enforce_umask
       database_path = @options[:database]
       return if File.exist?(database_path)
       FileUtils.mkdir_p(File.dirname(database_path))
@@ -70,6 +71,10 @@ def ensure_database
       end
     end
 
+    def enforce_umask
+      File.umask(022)
+    end
+
     def start_supervisor
       @supervisor = ServerEngine::Supervisor.new(Server, Worker) do
         force_options = {