ImageStreamTag possibly should not return 404 when a status exists and the image does not

[smarterclayton]

An image stream that has only referential (but no import) tags currently returns 404 when you try to look up the tag

  apiVersion: v1
  kind: ImageStream
  metadata:
    creationTimestamp: 2015-10-26T01:41:23Z
    name: installable
    namespace: default
    resourceVersion: "303"
    selfLink: /oapi/v1/namespaces/default/imagestreams/installable
    uid: aa34c0dd-7b82-11e5-8dcb-080027c5bfa9
  spec:
    tags:
    - annotations:
        io.openshift.generate.job: "true"
      from:
        kind: DockerImage
        name: openshift/origin:v1.0.6
      name: installable
    - from:
        kind: ImageStreamTag
        name: installable:installable
      name: latest
  status:
    dockerImageRepository: ""
    tags:
    - items:
      - created: 2015-10-26T01:41:23Z
        dockerImageReference: openshift/origin:v1.0.6
        image: ""
      tag: installable
    - items:
      - created: 2015-10-26T01:41:23Z
        dockerImageReference: openshift/origin:v1.0.6
        image: ""
      tag: latest

$ oc get istag/installable:latest
Error from server: imageStreamTag "installable:latest" not found

I'm not sure it's correct to return a 404 for a tag that clearly exists. We don't have a way to indicate the image has no metadata today, but we probably should.

[smarterclayton]

@miminar @ncdc @pweil-

[pweil-]

@soltysh

[miminar]

For image pruning, we are going to extend imageapi.Image for Finalizers and Status saying whether an image is about to be deleted. We could extend the Status to indicate that metadata are being imported (e.g. Status == Importing). Although it's a redundant information because such an image will have Name and DockerImageMetadata empty.

[smarterclayton]

We don't know what the images digest is until we import it, so there's no
place to put in Importing on an Image.

On Mon, Oct 26, 2015 at 10:03 AM, Michal Minar [email protected]
wrote:

For image pruning, we are going to extend imageapi.Image for Finalizers
and Status saying whether an image is about to be deleted. We could
extend the Status to indicate that metadata are being imported (e.g. Status
== Importing). Although it's a redundant information because such an
image will have Name and DockerImageMetadata empty.

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#5391 (comment).

[soltysh]

Since we're returning ImageStreamTag, I'd suggest returning ist information but with empty Image field, maybe eventually filled in DockerImageReference pointing to exact image. Which would then mean there's no information about that particular image. How's that?