Commits on Jan 12, 2021

1. test/utils/image: Support a single repository …

   In downstream contexts, it's extremely useful to be able to combine
   all the "testable" images in Kubernetes into a single repo so that
   a user could mirror these offline in one chunk, and audit the set of
   images for changes. For instance, within OpenShift we would like to
   have a single place we can place all the images used by all the tests
   with a single authentication scheme. While some images are not "real"
   and can't be mirrored (for instance, the images that point to an
   auth protected registry), that is not the majority.
   
   This code makes it possible to specify an environment variable
   KUBE_TEST_REPO that maps the static strings of the registry to a
   single repository by placing the uniqueness in a tag. For instance:
   
   KUBE_TEST_REPO=quay.io/openshift/community-e2e-images
   
   would translate `k8s.gcr.io/prometheus-to-sd:v0.5.0` to `quay.io/openshift/community-e2e-images:e2e-30-k8s-gcr-io-prometheus-to-sd-v0-5-0-6JI59Yih4oaj3oQOjRfhyQ`.
   
   The tag is a safe form of the name, plus the index (the constant within
   manifest.go), plus a hash of the full input. The length of the tag is
   constrained to the minimum of hash + index + the safe name.
   
   The public method is changed to return two maps - index to original
   name and index to test repo name. These maps would be the same if
   the env var is not set.

   

   smarterclayton committed Jan 12, 2021
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