[virt-tools-list] [PATCH virt-viewer] Only filter virt-viewer debug messages

Jonathon Jongsma jjongsma at redhat.com
Mon Jul 21 15:47:22 UTC 2014

On Mon, Jul 14, 2014 at 6:48 PM, Marc-André Lureau 
<mlureau at redhat.com> wrote:
> Hi
> ----- Original Message -----
>>  On Mon, Jul 14, 2014 at 1:03 PM, Marc-André Lureau
>>  <marcandre.lureau at gmail.com> wrote:
>>  > 
>>  > On Fri, Jul 11, 2014 at 6:43 PM, Jonathon Jongsma
>>  > <jjongsma at redhat.com> wrote:
>>  >> Christophe already fixed this issue, i think.  But it looks like 
>> his
>>  >> v2 patch didn't get an ACK:
>>  >> 
>> https://www.redhat.com/archives/virt-tools-list/2014-June/msg00273.html
>>  > 
>>  > Good point, but this patch just honors G_MESSAGES_DEBUG for older
>>  > glib version
>>  > 
>>  > This may look good, but it is a change of behaviour (nothing 
>> handles
>>  > G_MESSAGES_DEBUG in rhel6), so just setting SPICE_DEBUG=1 won't 
>> work.
>>  > You'll have to set G_MESSAGES_DEBUG on top, I disagree with that.
>>  That's not true. Christophe's change does NOT require 
>>  to be set.  In fact, the patch actively sets this env variable when
>>  --debug is passed (g_setenv("G_MESSAGES_DEBUG", G_LOG_DOMAIN, 1)) so
>>  that the user *doesn't* need to set this variable on newer versions 
>> of
>>  glib, just as they didn't need to set it on older versions of glib. 
>>  So
>>  I don't understand your argument.
> It just sets for virt-viewer, but not for other glib libraries, 
> especially SpiceGtk
> I think it's the wrong approach to implement G_MESSAGES_DEBUG in vv 
> just for rhel6
> and differ from the rest of the applications there.

OK, went back and looked at this again.  You're right that Christophe's 
patch is not sufficient to handle the issue of debug messages from 
libraries like spice-gtk.  But I think his patch is still necessary.  

As for your patch, I'm willing to ACK it, but a cleaner solution might 
be to simply use g_log_set_handler(G_LOG_DOMAIN, ...) instead of using 
g_log_set_default_handler().  Then you wouldn't need to worry about 
checking the domain inside the handler.  And external libraries (such 
as spice-gtk) would continue to use the default glib log handler. It's 
up to you.


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