Re: [Qemu-devel] [PATCH] qemu-img: Report error even with --oformat=json

[Markus Armbruster]

Max Reitz <address@hidden> writes:

> img_check() should report that the format of the given image does not
> support checks even if JSON output is desired. JSON data is output to
> stdout, as opposed to error messages, which are (in the case of
> qemu-img) printed to stderr. Therefore, it is easy to distinguish
> between the two.
>
> Also, img_info() does already use error_report() for human-readable
> messages even though JSON output is desired (through
> collect_image_info_list()).
>
> Signed-off-by: Max Reitz <address@hidden>
> ---
> As the old code deliberately emitted the error only in case of
> human-readable output, I asked Federico, the original author, for his
> opinion in https://bugzilla.redhat.com/show_bug.cgi?id=1054753, but did
> not receive a reply so far.
> ---
>  qemu-img.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/qemu-img.c b/qemu-img.c
> index d118da5..b3d2bc6 100644
> --- a/qemu-img.c
> +++ b/qemu-img.c
> @@ -663,9 +663,7 @@ static int img_check(int argc, char **argv)
>      ret = collect_image_check(bs, check, filename, fmt, fix);
>  
>      if (ret == -ENOTSUP) {
> -        if (output_format == OFORMAT_HUMAN) {
> -            error_report("This image format does not support checks");
> -        }
> +        error_report("This image format does not support checks");
>          ret = 63;

Undocumented return code.  Care to fix that, too?

>          goto fail;
>      }

Reviewed-by: Markus Armbruster <address@hidden>