Re: [libvirt] [PATCH v2 5/6] storage: add support for creating qcow3 images

I can understand why you're doing this, but gives me a really bad feeling. After 5 years we've finally stopped parsing -help from the QEMU binary...only to start doing the same for qemu-img. > ... IMHO we should just invoke qemu-img with the feature list we have, and rely on it to report any unsupported features itself, rather than trying to pre-detect them ourselves. Daniel