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Date: Thu, 10 Jan 2013 13:01:06 +0100
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20130110120106.GA30946@stefanha-thinkpad.redhat.com>
References: <CA+ePHTDfd3QLaMQ1DMsAMan0P1M1s6iLePJTFyGL5f-Zr08WaA@mail.gmail.com>
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Subject: Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image
 disk for windows system
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To: =?utf-8?B?6ams56OK?= <aware.why@gmail.com>
Cc: aliguori@us.ibm.com, qemu-devel@nongnu.org

On Wed, Jan 09, 2013 at 03:31:50PM +0800, 马磊 wrote:
> Hi,
> >>     The final effect is as follows:
> >>
> >>
> >> *[malei@xentest-4-1 Fri Dec 28 ~/honeypot/xen/xen-4.1.2]$ qemu-img-xen
> >> cat -f /1/boot.ini ~/vm-check.img *
> >> *[boot loader]*
> >> *timeout=30*
> >> *default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS*
> >> *[operating systems]*
> >> *multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP
> >> Professional" /noexecute=optin /fastdetect*
> >>
> >> [malei@xentest-4-1 Fri Dec 28 ~/honeypot/xen/xen-4.1.2]$ qemu-img-xen ls
> >> -l -d /1/ ~/vm-check.img
> >> *【name                 size(bytes) dir?      date
> >>  create-time】*
> >> *AUTOEXEC.BAT 0                file 2010-12-22        17:30:37*
> >> *boot.ini               211                file 2010-12-23
> >>  01:24:41*
> >> *bootfont.bin  322730                file 2004-11-23        20:00:00*
> >> *
> >> *
> >> *
> >> *
> >> *
> >> *
> >>
> >> *As you see above, the patch add two sub-commands for qemu-img-xen：cat
> >> and ls.*
> >> *
> >> *
> >> *For details in the patch, please check the attachment. *
> >>
> >>
> >>
> *Does anyone prefer this feature?!*

This is already possible with http://libguestfs.org/.

Or you can use qemu-nbd to mount the image on the host as explained
here:
http://blog.vmsplice.net/2011/02/how-to-access-virtual-machine-image.html

Although adding file system code to qemu-img integrates this feature
more closely, I think the maintenance overhead and duplication of having
read-only file system implementations is too much.  Therefore, I'm
against merge a patch like this.

Stefan