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Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk fo
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system |
Date: |
Fri, 11 Jan 2013 10:26:57 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Jan 11, 2013 at 03:27:52PM +0800, 马磊 wrote:
> On Fri, Jan 11, 2013 at 2:28 PM, Wanlong Gao <address@hidden>wrote:
>
> > On 01/11/2013 11:39 AM, 马磊 wrote:
> > >
> > >
> > > On Thu, Jan 10, 2013 at 8:20 PM, Daniel P. Berrange
> > > <address@hidden<mailto:
> > address@hidden>> wrote:
> > >
> > > On Wed, Jan 09, 2013 at 09:37:54PM +0000, Blue Swirl wrote:
> > > > On Wed, Jan 9, 2013 at 7:31 AM, 马磊 <address@hidden <mailto:
> > 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.
> > >
> > > The latter is what libguestfs already provides. It boots a Linux
> > kernel
> > > and mini initrd containing a guest agent, to provide APIs to do
> > arbitrary
> > > manipulation of guest OS images.
> > >
> > > The reason libguestfs used a linux guest was precisely to avoid
> > having
> > > to re-implement drivers for every filesystem in existance like this
> > > patch is trying todo.
> > >
> > > I don't think QEMU wants to be in the business of maintaining
> > filesystem
> > > drivers, so I'd reject this proposed patch.
> > >
> > > Regards,
> > > Daniel
> > > --
> > > |: http://berrange.com -o-
> > http://www.flickr.com/photos/dberrange/ :|
> > > |: http://libvirt.org -o-
> > http://virt-manager.org :|
> > > |: http://autobuild.org -o-
> > http://search.cpan.org/~danberr/ :|
> > > |: http://entangle-photo.org -o-
> > http://live.gnome.org/gtk-vnc :|
> > >
> > >
> > >
> > > This feature could be configured to be optional in make file
> > configuration according to individual preference.
> > > _In addition, the fat32 and ntfs filesystem driver will not change for a
> > long time so it needs no much maintainence once implemented._
> >
> > As Daniel and Stefan said, you can try to use libguestfs [libguestfs.org]
> > and qemu-nbd.
> > In libguestfs, we provide virt-cat, virt-ls, etc. And support all the disk
> > type which QEMU supported.
> >
> > Thanks,
> > Wanlong Gao
> >
> >
> *I used libguest, it's startup takes too long to meet specific requirements
> under some time-sensitive circumstance. *
Then use qemu-nbd instead. It's fast and you can use all the file
systems supported by your host (ext4, xfs, fat, ntfs, etc), as well as
LVM or encrypted volumes.
Stefan
Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, Daniel P. Berrange, 2013/01/10
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, 马磊, 2013/01/10
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, Wanlong Gao, 2013/01/11
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, 马磊, 2013/01/11
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, Blue Swirl, 2013/01/12
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, Wanlong Gao, 2013/01/13
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, Stefan Hajnoczi, 2013/01/14
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, Blue Swirl, 2013/01/17
- Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, Stefan Hajnoczi, 2013/01/18
Re: [Qemu-devel] [PATCH] reading files from qcow2-formated image disk for windows system, Stefan Hajnoczi, 2013/01/10