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Date: Wed, 08 Apr 2009 08:35:09 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [libvirt] Re: [Qemu-devel] Changing the QEMU svn VERSION string
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To: Jamie Lokier <jamie@shareable.org>
Cc: libvir-list@redhat.com, qemu-devel@nongnu.org, kvm-devel <kvm@vger.kernel.org>

On 04/07/09 19:13, Jamie Lokier wrote:
> Anthony Liguori wrote:
>> I still think libvirt should work with versions of QEMU/KVM built from
>> svn/git though.  I think the only way to do that is for libvirt to relax
>> their version checks to accommodate suffixes in the form
>> major.minor.stable-foo.
>
> Ok, but try to stick to a well-defined rule about what suffix means
> "later" or "earlier".  In package managers, "1.2.3-rc1" is typically
> seen as a later version than "1.2.3" purely due to syntax.

Fedora typically handles this using a leading zero in the 'release' 
component for pre-final versions, like this: app-1.2.3-0.rc1.fc11 
(rc/beta) and app-1.2.3-1.fc11 (final).  Likewise for snapshots: 
app-1.2.3-0.svn${date}.fc11

> If you're
> consistently meaning "0.11.0-rc1" is earlier than "0.11.0" (final),
> that might need to be encoded in libvirt and other wrappers, if they
> have any fine-grained version sensistivity such as command line
> changes or bug workarounds.

libvirt scans the help text to figure which features are present 
(checking for as -drive and -uuid cmd line switches for example).

cheers,
   Gerd