Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system

[马磊]

On Thu, Jan 10, 2013 at 4:03 PM, 马磊 <address@hidden> wrote:

On Thu, Jan 10, 2013 at 5:37 AM, Blue Swirl <address@hidden> wrote:

On Wed, Jan 9, 2013 at 7:31 AM, 马磊 <address@hidden> wrote:
>
>
>>> Hi,
>>>     The final effect is as follows:
>>>
>>>
>>> address@hidden 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
>>>
>>> address@hidden 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?!

Nice feature, but this approach would just clutter QEMU and give only
readonly FAT or NTFS support. I think a more generally useful approach
would be to use NBD or iSCSI to export the block device data from the
image file (qemu-nbd already exists) and then make a tool that uses
some combination of NBD/iSCSI client, all GRUB file systems and FUSE
or other user space methods to access the contents of the filesystem.
Probably also UML with a simple guest agent could provide read/write
access to any file system that Linux supports.

>
>
>
> Signed-off-by: Lei Ma (address@hidden)
>
> diff --exclude=.svn -rpN -U8 xen-4.1.2-a/tools/ioemu-qemu-xen/debug.c

Patches sent to qemu-devel should be based on qemu.git. Please also
read CODING_STYLE and HACKING files.

Do you mean the git of git://xenbits.xen.org/staging/qemu-upstream-unstable.git?

./configure reports: glib-2.12 required to compile QEMU; but the latest version is glib-1.2.10-20.el5.x86_64 for kernel 2.6.18-274.3.1.el5xen.

How to make and use the latest qemu from qemu.git? 

Besides, the patch is a little big and the patch now can't be completely inserted into the latest qemu-upstream 

so that  fully conforming to the CODING_STYLE is not a little work, if anyone is interested in the feature, welcome to join in the work.