Re: [Qemu-devel] [PATCH 5/8] qemu-img: img_create(): use Error object

[Kevin Wolf <kwolf@redhat.com>]

Am 18.10.2012 15:49, schrieb Luiz Capitulino:
> On Thu, 18 Oct 2012 14:11:40 +0200
> Kevin Wolf <kwolf@redhat.com> wrote:
> 
>> Am 17.10.2012 21:35, schrieb Luiz Capitulino:
>>> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
>>> ---
>>>  qemu-img.c | 10 +++++++---
>>>  1 file changed, 7 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/qemu-img.c b/qemu-img.c
>>> index 12fb6c2..dfde588 100644
>>> --- a/qemu-img.c
>>> +++ b/qemu-img.c
>>> @@ -302,6 +302,7 @@ static int img_create(int argc, char **argv)
>>>      const char *base_filename = NULL;
>>>      char *options = NULL;
>>>      QEMUOptionParameter *params = NULL;
>>> +    Error *local_err = NULL;
>>>  
>>>      for(;;) {
>>>          c = getopt(argc, argv, "F:b:f:he6o:");
>>> @@ -362,9 +363,12 @@ static int img_create(int argc, char **argv)
>>>          goto out;
>>>      }
>>>  
>>> -    ret = bdrv_img_create(filename, fmt, base_filename, base_fmt,
>>> -                          options, img_size, BDRV_O_FLAGS, &params, NULL);
>>> -    if (ret < 0) {
>>> +    bdrv_img_create(filename, fmt, base_filename, base_fmt,
>>> +                    options, img_size, BDRV_O_FLAGS, &params, &local_err);
>>> +    if (error_is_set(&local_err)) {
>>> +        fprintf(stderr, "qemu-img: %s\n", error_get_pretty(local_err));
>>
>> This should use error_report() instead of adding the "qemu-img:" manually.
> 
> If you want to do it for consistency with the current code then ok,
> I'll do it for v2. But I disagree qemu-img should keep using error_report(),
> printing to hmp for example is something beyond the interests of a tool like
> qemu-img.

qemu-img doesn't have an HMP monitor, so it doesn't hurt either. If you
want to replace it, replace it with a copy of qemu-error.c that only
removes the monitor_vprintf() case. That is, in particular, leave all of
the loc_*() functionality there, because this is something that is meant
for use in command line parsers.

That qemu-img doesn't use these functions yet should be fixed. It has
some good use cases for them.

Kevin