Am 21-01-2014 05:23, schrieb apporc:

@@ -60,6 +65,8 @@ class FeatureTests(object):
          xml = ISO_STREAM_XML % {'protocol': protocol}
          conn = None
          try:
+            # Register the error handler to hide libvirt error in stderr
+            libvirt.registerErrorHandler(f=libvirt_errorhandler, ctx=None)
              conn = libvirt.open('qemu:///system')
              dom = conn.defineXML(xml)
              dom.undefine()

Does that suppress *all* future libvirt error messages? If it does, I don't think that's a good idea, it's very important to see error messages when they happen.
If there's some way to suppress only those messages you mentioned in this patch's description, it would be better. I believe you can unregister a handler when you don't need it anymore.

@@ -222,7 +222,6 @@ class Model(object):
                  sys.exit(1)

      def _set_capabilities(self):
-        kimchi_log.info("*** Running feature tests ***")
          self.qemu_stream = FeatureTests.qemu_supports_iso_stream()
          self.qemu_stream_dns = FeatureTests.qemu_iso_stream_dns()

@@ -231,7 +230,6 @@ class Model(object):
              if FeatureTests.libvirt_supports_iso_stream(p):
                  self.libvirt_stream_protocols.append(p)

-        kimchi_log.info("*** Feature tests completed ***")
      _set_capabilities.priority = 90

      def get_capabilities(self):

I think those two messages are useful, they're reporting something that's happening in background. There was once a bug that occurred when the feature tests started but never finished, and we could tell that by looking at those exact two messages (the second message never showed up, in that case).