Start on a basic registry_model interface and change a single module to use it. This will allow us to completely abstract out how we deal with registry-related tables and ensure that transitioning to the new OCI-like model will be easier to do.

data/registry_model/test/test_pre_oci_model.py

@@ -0,0 +1,40 @@
+import pytest
+
+from data import model
+from data.registry_model.registry_pre_oci_model import PreOCIModel
+from data.registry_model.datatypes import RepositoryReference
+from test.fixtures import *
+
+@pytest.fixture()
+def pre_oci_model(initialized_db):
+  return PreOCIModel()
+
+
+@pytest.mark.parametrize('names, expected', [
+  (['unknown'], None),
+  (['latest'], 'latest'),
+  (['latest', 'prod'], 'latest'),
+  (['foo', 'prod'], 'prod'),
+])
+def test_find_matching_tag(names, expected, pre_oci_model):
+  repo = model.repository.get_repository('devtable', 'simple')
+  repository_ref = RepositoryReference.for_repo_obj(repo)
+  found = pre_oci_model.find_matching_tag(repository_ref, names)
+  if expected is None:
+    assert found is None
+  else:
+    assert found.name == expected
+
+
+@pytest.mark.parametrize('repo_namespace, repo_name, expected', [
+  ('devtable', 'simple', 'latest'),
+  ('buynlarge', 'orgrepo', 'latest'),
+])
+def test_get_most_recent_tag(repo_namespace, repo_name, expected, pre_oci_model):
+  repo = model.repository.get_repository(repo_namespace, repo_name)
+  repository_ref = RepositoryReference.for_repo_obj(repo)
+  found = pre_oci_model.get_most_recent_tag(repository_ref)
+  if expected is None:
+    assert found is None
+  else:
+    assert found.name == expected