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Re: [Qemu-block] [Qemu-devel] [PATCH 2/2] qemu-img: Add dd seek= option

From: Fam Zheng
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 2/2] qemu-img: Add dd seek= option
Date: Mon, 20 Aug 2018 10:07:15 +0800
User-agent: Mutt/1.10.1 (2018-07-13)

On Thu, 08/16 04:20, Max Reitz wrote:
> No, the real issue is that dd is still not implemented just as a
> frontend to convert.  Which it should be.  I'm not sure dd was a very
> good idea from the start, and now it should ideally be a frontend to
> convert.
> (My full opinion on the matter: dd has a horrible interface.  I don't
> quite see why we replicated that inside qemu-img.  Also, if you want to
> use dd, why not use qemu-nbd + Linux nbd device + real dd?)

The intention is that dd is a familiar interface and allows for operating on
portions of images. It is much more convenient than "qemu-nbd + Linux nbd + dd"
and a bit more convenient than "booting a Linux VM, attaching the image as a
virtual disk, then use dd in the guest". More so when writing tests.


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