[Libguestfs] Can't access remote URI

Wanlong Gao gaowanlong at cn.fujitsu.com
Thu Dec 20 09:30:03 UTC 2012

On 12/20/2012 05:08 PM, Richard W.M. Jones wrote:
> On Thu, Dec 20, 2012 at 04:00:10PM +0800, Wanlong Gao wrote:
>> Hi Rich,
>> We just found that the libguestfs can't access the remote URI.
>> When doing guestfs__add_drive_opts(), we always add files from
>> local system, it's related the -c|--connect option.
>> As I know, we are using local kernel to lunch the min-guest,
>> and it's hard to attach remote disks to our local min-guest.
>> Our test team found this problem by using following command,
>> # virt-sysprep -c qemu+ssh://<host>/system -d domname
>> Then, for example the path of remote disk is /work/rhel.img,
>> but we are about to access the /work/rhel.img locally.
>> So, IMHO, if we are about to not support the remote URI, we
>> should give a error message first. But access local disks
>> instead of remote disks are definitely wrong here.
>> Maybe we also need document this.
>> Any thoughts?
> John Eckersberg is working on implementing this for libguestfs 1.22.
> Most of the libvirt support has been done already, but there is some
> more libvirt and libguestfs work.
> As for reporting an error, it's difficult because libvirt doesn't give
> a simple way to find out if a URI is "remote" or not (whatever
> "remote" means).  And even if libvirt did, it's not necessarily true
> that remote URIs wouldn't work, eg. if the user attached a LUN to both
> the remote and local machine.

So, at this time, we should report a useful message to user but not just
fail without any thing. Right?

Wanlong Gao

> Rich.

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