Re: [Qemu-block] [Qemu-devel] [PATCH v3] qemu-img: change opening method for the output in dd

[Stefan Hajnoczi]

On Fri, Aug 19, 2016 at 09:06:08PM +0200, Reda Sallahi wrote:
> On Tue, Aug 16, 2016 at 12:09:06PM +0100, Stefan Hajnoczi wrote:
> > On Mon, Aug 15, 2016 at 02:11:49PM +0200, Reda Sallahi wrote:
> > > +    blk2 = blk_new_open(image_opts ? NULL : out.filename,
> > > +                        NULL, qoptions, BDRV_O_RDWR, NULL);
> > 
> > This code duplicates a subset of img_open().  Why can't you use
> > img_open() or at least img_open_opts()/img_open_file()?
> 
> If I used img_open() here (or img_open_opts()/img_open_file() for that
> matter) it would have written on stderr that the file couldn't be opened
> here even though in this case it's not error if we can create the output
> image and open it later on.

Then img_open() should be extended so the caller can suppress the error
message or gets a Error object instead of output to stderr.

Stefan

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