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From: Markus Armbruster <armbru@redhat.com>
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Date: Thu, 25 Mar 2010 20:30:33 +0100
In-Reply-To: <20100325144921.05e4a27c@redhat.com> (Luiz Capitulino's message
	of "Thu, 25 Mar 2010 14:49:21 -0300")
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Subject: [Qemu-devel] Re: [PATCH 3/3] monitor: Convert do_migrate() to QError
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To: Luiz Capitulino <lcapitulino@redhat.com>
Cc: qemu-devel@nongnu.org

Luiz Capitulino <lcapitulino@redhat.com> writes:

> On Thu, 25 Mar 2010 18:37:25 +0100
> Markus Armbruster <armbru@redhat.com> wrote:
>
> [...]
>
>> >> @@ -86,12 +86,13 @@ int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
>> >>                                          (int)qdict_get_int(qdict, "inc"));
>> >>  #endif
>> >>      } else {
>> >> -        monitor_printf(mon, "unknown migration protocol: %s\n", uri);
>> >> +        qerror_report(QERR_INVALID_PARAMETER, "uri");
>> >>          return -1;
>> >>      }
>> >>  
>> >>      if (s == NULL) {
>> >> -        monitor_printf(mon, "migration failed\n");
>> >> +        /* TODO push error reporting into the FOO_start_outgoing_migration() */
>> >> +        qerror_report(QERR_MIGRATION_FAILED);
>> >>          return -1;
>> >>      }
>> >
>> >  I think this one is no better than the automatic UndefinedError
>> > which is going to be triggered. I would only touch this when/if
>> > we get the migration functions converted.
>> 
>> I feel it is a bit better, because:
>> 
>> * It doesn't dilute the nice "this is a bug, and I should report it"
>>   property of UndefinedError.
>> 
>> * It avoids the "returned failure but did not pass an error" message.
>>   Minor, because it's under CONFIG_DEBUG_MONITOR.
>
>  But this is exactly what we want because having QERR_MIGRATION_FAILED
> there doesn't fix the problems those warnings are making us aware of.

Except we are already aware of the problem, and additional warnings are
just noise.