On 05/21/2012 07:59 AM, Richard W.M. Jones wrote: >> >> Hm, I'm wondering... If I have a command line like this: >> >> qemu-img diff -b base.img modified.img diff.qcow2 >> >> Would this be equivalent to this sequence? >> >> qemu-img create -f qcow2 -b modified.img diff.qcow2 >> qemu-img rebase -b base.img diff.qcow2
So 'qemu-img rebase' is able to rebase to any other image, even if base.img is nowhere in the backing chain of modified.img? That means it is more powerful than runtime 'block-stream' monitor command under qemu, which can only do a block pull from an earlier point in the backing chain. > Yes. I tried for a while to work out the sequence of commands that > could make a diff using 'qemu-img rebase', but it wasn't obvious and I > gave up. It should at least be documented. How about the attached > patch? Seems reasonable to me. A two-command sequence of qemu-img to manipulate offline images isn't all that bad; it's different from the case of a disk image in active use by qemu. -- Eric Blake ebl...@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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