Patch Log4r to allow trace logging level

lib/vagrant/patches/log4r.rb

@@ -0,0 +1,39 @@
+# This adds trace level support to log4r. Since log4r
+# loggers use the trace method for checking if trace
+# information should be included in the output, we
+# make some modifications to allow the trace check to
+# still work while also supporting trace as a valid level
+require "log4r/loggerfactory"
+
+if !Log4r::Logger::LoggerFactory.respond_to?(:fake_define_methods)
+  class Log4r::Logger::LoggerFactory
+    class << self
+      def fake_set_log(logger, lname)
+        real_set_log(logger, lname)
+        if lname == "TRACE"
+          logger.instance_eval do
+            alias :trace_as_level :trace
+            def trace(*args)
+              return @trace if args.empty?
+              trace_as_level(*args)
+            end
+          end
+        end
+      end
+
+      def fake_undefine_methods(logger)
+        real_undefine_methods(logger)
+        logger.instance_eval do
+          def trace
+            @trace
+          end
+        end
+      end
+
+      alias_method :real_undefine_methods, :undefine_methods
+      alias_method :undefine_methods, :fake_undefine_methods
+      alias_method :real_set_log, :set_log
+      alias_method :set_log, :fake_set_log
+    end
+  end
+end