Annotations for descriptors?

[wking]

In #438, @vbatts proposed optional ref annotations:

{
  "ref": "stable",
  "annotations": {
    "org.waffles.with": "syrup,raspberries",
    "io.flatpak.app.name": "org.gnome.gedit"
  }
}

to support “top level views” in tooling that may publish or fetch from an OCI image-layout. I'm not entirely clear on that use case, but it brings up two questions:

1. Do we need annotations for refs? Basically, can someone explain the “top level views” use-case in more detail.
2. After establishing (1), can we accomplish that same goal by adding annotations to our descriptor model? This would allow us to support ref (and other) annotations even for refs accessed by the ref/ directory or other ref engine.

[vbatts]

I've just done something like this in #438 (comment)

[wking]

On Tue, Nov 29, 2016 at 02:22:18PM -0800, Vincent Batts wrote: I've just done something like this in #438 (comment)

I don't see #438 (as it stands with 9b6dd3d) adding annotations to the descriptor type. And I think that's one of the things @stevvooe was proposing [1]. [1]: #438 (comment) 2. Add an annotations field to descriptor.