Re: [Qemu-devel] [RFC] introduce a dynamic library to expose qemu block API

[Christoph Hellwig]

On Fri, Jul 13, 2012 at 12:42:41PM +0200, Kevin Wolf wrote:
> It still feels a bit more like qemu-io-style operations. Not sure what
> your use case looks like exactly, but adding a qemu-io command that
> reads data from a file and writes it at a given offset into the images
> (or vice versa) should be easy. This would be more or less a qemu-dd.

We already have that if you read/write the whole image, it's called
qemu-img convert.

> If you need to get data from stdin or output it to stdout, then it might
> not be the right solution.

That is the use case.  We could appromite it by writing a temp file and
using qemu-img convert, but that's not very efficient.