On Tue, Jul 27, 2010 at 10:55:03AM -0500, Anthony Liguori wrote: > Today libvirt parses -help output to attempt to enumerate capabilities. This > is very broken and has led to multiple failures. Since libvirt is an > important > management interface to QEMU, we need to do a better job giving them the > ability > to detect what a QEMU executable supports. Right now, we keep fixing up help > output to appease it's parsing code but this is undesirable. > > The Right Solution is to introduce a robust capabilities advertisement that > enumerates every feature we have. As with most Right Solutions, we don't have > mergable code today and it's unclear that we'll get there by the next release. > > This patch introduces an incremental solution of just spitting out the handful > of capabilities libvirt is probing for today. This interface will need to > remain forever but can stop being updated once we have a Right Solution.
This isn't really workable because it only encodes the subset of things that libvirt currently looks for. If someone comes along with a libvirt patch for a new features that is already supported by QEMU, but isn't in this simple output, we're stuck. Adding a one-off special case for the 0.13 release that we know will be obsolete in 0.14, and obviously can't be used in qemu < 0.12 is not really a worthwhile use of time. libvirt has to keep supporting help parsing indefinitely for <= 0.12 releases & expects to support a new extensible & flexible approach for qemu >= 0.14. Adding a special case that both libvirt & qemu have to support indefinitely for 0.13 is not really very nice. Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
