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Re: [libvirt] [PATCH] virsh: Improve editing

On 05/16/2011 01:12 AM, Daniel Veillard wrote:
> On Fri, May 13, 2011 at 02:42:29PM +0100, Daniel P. Berrange wrote:
>> There are two common problems with virsh edit & friends
>>   - Invalid XML syntax, causes error report & lost changes
>>   - User add unsupported/unknown XML attributes/elements which
>>     are silently discarded by libvirt
>> This patch only fixes the first problem. It would be nice to
>> fix the second two, by running the XML through the RNG schema
>> validator.
>> Rather than do this in virsh though, I'd add some flags to
>> the virXXXXDefine/Create  APIs, eg
>> virsh can set this flag by default, and if the XML fails
>> validation, it could prompt the user, asking if they want
>> to proceed anyway (in which case recall the same API but
>> without the validate flag set), or re-edit the XML
>   Hum, yes I agree with the option of validating on define of APIs
> the only problem is that we tend to have holes in the RNG, but
> since that would be optional I think that's okay, this would
> hopefully help finding the mismatches between the RNG and the C parsing
> code.

There's also the idea of doing a round trip parse -> dumpxml -> compare;
but that also has problems where dumpxml sometimes rearranges elements
or populates backwards-compatibility additions that were not present in
the original.

Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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