Re: [Qemu-block] [Qemu-devel] [PATCH 1/3] qemu-img: Allow rebase with no input base

[Eric Blake]

On 7/13/18 6:14 AM, Max Reitz wrote:
> Currently, you cannot add a backing file to an image when it currently
> has none.  It is really simple to allow this, though (effectively by
> setting old_backing_size to 0), so this patch does just that.

Can't you do that with 'rebase -u'? I guess the point of this patch is
to make 'rebase' without -u also able to add a backing file?  A bit more
clarity in the commit message, such as a sample command line (and
possibly even the error it issued pre-patch) would help.

> 
> Signed-off-by: Max Reitz <address@hidden>
> ---
>  qemu-img.c | 61 ++++++++++++++++++++++++++++++------------------------
>  1 file changed, 34 insertions(+), 27 deletions(-)

At any rate, the code looks fine, even if the diff is harder to read
because of added indentation.

Reviewed-by: Eric Blake <address@hidden>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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