[Qemu-devel] qemu-img

[Qemu-devel] qemu-img

[D. Schreiber]

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Hello,

is it possible to add "pipe"-Mode like this?

dd if=/dev/sda | qemu-img convert -f raw - -O qcow2 newImage.img

I know i can read directly from device, but in some cases (i.e. get data
from netcat) it would be nice to convert from stdin. Alternative: read
from fifo.

Another wish is to mount an compressed qcow-Image as loop-Device.

Regards
D. Schreiber

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Re: [Qemu-devel] qemu-img

[Kevin Wolf]

D. Schreiber schrieb:
> Hello,
> 
> is it possible to add "pipe"-Mode like this?
> 
> dd if=/dev/sda | qemu-img convert -f raw - -O qcow2 newImage.img
> 
> I know i can read directly from device, but in some cases (i.e. get data
> from netcat) it would be nice to convert from stdin. Alternative: read
> from fifo.

That shouldn't be too difficult to implement. It just needs someone to
do it.

> Another wish is to mount an compressed qcow-Image as loop-Device.

You can use qemu-nbd instead.

Kevin

Re: [Qemu-devel] qemu-img

[Lennart Sorensen]

On Thu, Feb 12, 2009 at 06:15:57PM +0100, D. Schreiber wrote:
> is it possible to add "pipe"-Mode like this?
> 
> dd if=/dev/sda | qemu-img convert -f raw - -O qcow2 newImage.img

Does this work:

dd if=/dev/sda | qemu-img convert -f raw <(dd if=/dev/sda) -O qcow2 newImage.img

> I know i can read directly from device, but in some cases (i.e. get data
> from netcat) it would be nice to convert from stdin. Alternative: read
> from fifo.
> 
> Another wish is to mount an compressed qcow-Image as loop-Device.

I suspect you have to write a loop device handler for the kernel to
support that.  Sounds perfectly doable.

-- 
Len Sorensen

Re: [Qemu-devel] qemu-img

[Jamie Lokier]

Lennart Sorensen wrote:
> On Thu, Feb 12, 2009 at 06:15:57PM +0100, D. Schreiber wrote:
> > is it possible to add "pipe"-Mode like this?
> > 
> > dd if=/dev/sda | qemu-img convert -f raw - -O qcow2 newImage.img
> 
> Does this work:
> 
> dd if=/dev/sda | qemu-img convert -f raw <(dd if=/dev/sda) -O qcow2 newImage.img

No point running dd twice at the same time :-)

I suspect you meant one of these:

dd if=/dev/sda | qemu-img convert -f raw /dev/stdin -O qcow2 newImage.img

qemu-img convert -f raw <(dd if=/dev/sda) -O qcow2 newImage.img

-- Jamie

Re: [Qemu-devel] qemu-img

[Lennart Sorensen]

On Fri, Feb 13, 2009 at 03:52:27PM +0000, Jamie Lokier wrote:
> No point running dd twice at the same time :-)
> 
> I suspect you meant one of these:
> 
> dd if=/dev/sda | qemu-img convert -f raw /dev/stdin -O qcow2 newImage.img
> 
> qemu-img convert -f raw <(dd if=/dev/sda) -O qcow2 newImage.img

That one.

I copied the line, edited it, and forgot to finish deleting.

-- 
Len Sorensen

[Qemu-devel] Re: qemu-img

[D. Schreiber]

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Hello,

thank's a lot for the hints.

> is it possible to add "pipe"-Mode like this?

Some tipps doesn't work or not what i'm looking for.

> You can use qemu-nbd instead.

I'll take a look of this.


Regards
D. Schreiber

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