[libvirt] [RFC][PATCH] storage: allow alphabetical names in owner/group of permissions

Daniel P. Berrange berrange at redhat.com
Mon Mar 16 20:03:27 UTC 2009

On Mon, Mar 16, 2009 at 10:01:38AM +0100, Daniel Veillard wrote:
> On Sun, Mar 15, 2009 at 02:47:14AM +0900, Ryota Ozaki wrote:
> > Hi,
> > 
> > This patch allows to specify owner/group of permissions in storage XML
> > as alphabetical names.
> > 
> > One concern of this patch is since alphabetical names are converted
> > to uid/gid at XML parsing (e.g., virsh pool-define some-pool.xml),
> > the generated XML file for libvirt internal does not contain the original
> > alphabetical names and dumpxml does not as well. Is it better the
> > conversion is done when activated not defined?
>   Yes, I'm wondering about this. Usually it's better if the XML
> can round-trip without change (i.e. the exported version is the
> same as the imported one), modulo maybe some reordering of elements.
> But loosing information or distortions in the cycle tend to generate
> problems. So I'm wondering what is in your opinion the added value
> of having livirt do that conversion instead of the layer on top of
> libvirt.

Yeah, I don't hugely like the idea of usernames turning into UIDs
when you round-trip the XML. Other places where we didn't correctly
preserve data on a round-trip have proved to be rather painful to
deal with for apps (eg, automatic VNC port number, or automatic
VIF names). I'm not sure what the right answer is for this problem
of uid vs username.

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