On 04/17/2013 07:35 AM, Skardal, Harald wrote: > I have not found support in libvirt (nor virsh) for doing the equivalent > of "qemu-img rebase ....". Correct - offline image manipulation is something I'd love to see added, but last time I worked on the issue, I realized that there is a LOT of design work still needed. With online image chain manipulation, we can start a long-running job, and qemu keeps track of it for us. So we can restart libvirtd, and then ask qemu if the job is done yet, thanks to qemu supporting a Unix socket monitor connection that we can reconnect to at will. But with offline image manipulation, a long-running job means spawning a qemu-img child process, and that does not have an ability to reconnect. So libvirt itself would be responsible for setting up enough management resources that the management of qemu-img can survive a libvirtd restart. Not as trivial as I'd like. > > > > The use case: > > You have copied a qcow2 stack and the new files have different names or > reside in a different directory. Therefore you need to change the > backing file. > > > > Is there a way to do this? Is this a planned addition to libvirt? > Yes, it's planned, but only when someone has enough time to make it their highest priority effort in patching efforts. In the meantime, you have to settle with doing qemu-img calls yourself, then updating libvirt's state to match your manual changes. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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