[openstack-dev] RFC: Recording/providing ISO image headers in glance

lzy.dev at gmail.com lzy.dev at gmail.com
Tue Apr 9 08:37:10 UTC 2013

On Tue, Apr 9, 2013 at 4:18 PM, Daniel P. Berrange <berrange at redhat.com> wrote:
> On Mon, Apr 08, 2013 at 10:59:32AM -0700, Mark Washenberger wrote:
>> Sorry I missed this earlier, but, couldn't you just run "isoinfo" on
>> the image data before you upload it to Glance, and add the properties
>> you care about during image creation? We could document those property
>> names and values (and maybe even validate them) to make sure they
>> retain their canonical meaning.
> You need to have something that apps can rely on existing for all
> images and more importantly being correct. I don't think requiring
> the users to manually set this is satisfactory. You also can't
> assume that the user actually has the ISO locally - you can tell
> Glance to pull images straight from a remote HTTP url, which makes
> running isoinfo impossible.
I consider this make sense also so far.

>> Otherwise, adding a hook to "inspect image and add relevant
>> properties" doesn't really have a good place to fit into Glance at the
>> moment, IMO.
> Well that will have to be dealt with as part of the development
> of this feature.

>> On Fri, Apr 5, 2013 at 3:04 PM, Mark Atwood <mark.atwood at hp.com> wrote:
>> > Instead of just for ISO9660, I know that other filesystem images and also
>> > various VM storage images also define various metadata.  (I know that I've
>> > read and written metadata for Virtual Box images using the GUI tool, for
>> > example.)
>> >
>> > I think it makes sense to do this in such a way that Glance can make all
>> > these metadatas from all image formats discoverable and displayable.
> Yep, it of course makes sense to design it as a pluggable facility
> to allow for different file types to have different default metadata.
I'm interested on this pluggable facility, it should be an image type
awarable discovery pip/chain.

>> > On Wed, Jan 30, 2013 at 2:55 AM, Daniel P. Berrange <berrange at redhat.com>
>> > 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.
> Daniel
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