Re: [Qemu-devel] [PATCH 6/9] QError: Add qdev not found error

[Anthony Liguori <aliguori@us.ibm.com>]

>>> Aside from that, we should certainly be able to change the pretty text,
>>> for example, to provide additional clarification to the user. The
>>> machine-interpreted code, on the other hand, wouldn't change.
>>>       
>>  How do you plan to do it in the design you're proposing? If you
>> use the text from qemu_error() to build the user and protocol
>> outputs, then you can't change it.
>>     
>
> Today it looks like this:
>         C: open host USB device foo
>         S: error 404, host USB device foo is already open
>
> Tomorrow it could look like this:
>         C: open host USB device foo
>         S: error 404, host USB device foo is already open by PID 27
>   

What's tough about this sort of error handling is that it's not 
conducive to localization.  It's not unusual for the server to have a 
different locale than the client so you really need the client to be 
able to translate error messages into meaningful messages in the client 
locale.

This is the typical argument for highly structured error reporting.

-- 
Regards,

Anthony Liguori