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I think the originally proposed design is the most straight forward. I'd, in fact, love to see standard properties documented for ISO and other formats. I'm pretty sure a lot of information is stored in other formats that would be very useful to users. 

I'd also like these properties to be read-only, but that's probably down the line/in the future.

Brian


On Feb 6, 2013, at 10:29 AM, "Daniel P. Berrange" <berrange at redhat.com> wrote:

> On Wed, Jan 30, 2013 at 10:55:41AM +0000, Daniel P. Berrange wrote:
>> Some apps have a need to be able to obtain ISO filesystem headers from
>> images stored in glance. Now obviously they can just download the image
>> (or part of it) and run 'isoinfo' on it, but this is really horrifically
>> inefficient/wasteful of bandwidth. It would be desirable for glance to
>> have explicit support for this in some way.
>> 
>> I've written a short wiki page describing one approach, which is to
>> make glance extract the data upon upload of an ISO and store it in
>> some well-defined metadata properties against the image.
>> 
>>    http://wiki.openstack.org/GlanceISOHeaders
>>    https://blueprints.launchpad.net/glance/+spec/iso-image-metadata
>> 
>> A completely different approach we be to ignore metadata properties
>> and add an explicit API to glance which would extract it on-demand,
>> but I feel this is a needlessly large amount of work & less convenient
>> and flexible than simply using existing metadata properties.
> 
> Does no one else have any comments on this proposed design ?
> 
> Daniel
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