Add support for direct pushing of schema 2 manifests without tags

This is required for manifest lists

data/model/oci/tag.py

@@ -1,3 +1,4 @@
+import uuid
 import logging
 
 from calendar import timegm
@@ -155,6 +156,47 @@ def get_expired_tag(repository_id, tag_name):
     return None
 
 
+def create_temporary_tag(manifest, expiration_sec):
+  """ Creates a temporary tag pointing to the given manifest, with the given expiration in seconds.
+  """
+  tag_name = '$temp-%s' % str(uuid.uuid4())
+  now_ms = get_epoch_timestamp_ms()
+  end_ms = now_ms + (expiration_sec * 1000)
+
+  legacy_image = get_legacy_image_for_manifest(manifest)
+
+  with db_transaction():
+    created_tag = Tag.create(name=tag_name,
+                             repository=manifest.repository_id,
+                             lifetime_start_ms=now_ms,
+                             lifetime_end_ms=end_ms,
+                             reversion=False,
+                             hidden=True,
+                             manifest=manifest,
+                             tag_kind=Tag.tag_kind.get_id('tag'))
+
+    # TODO(jschorr): Remove the linkage code once RepositoryTag is gone.
+    # If this is a schema 1 manifest, then add a TagManifest linkage to it. Otherwise, it will only
+    # be pullable via the new OCI model.
+    if manifest.media_type.name in DOCKER_SCHEMA1_CONTENT_TYPES and legacy_image is not None:
+      now_ts = int(now_ms / 1000)
+      end_ts = int(end_ms / 1000)
+
+      old_style_tag = RepositoryTag.create(repository=manifest.repository_id, image=legacy_image,
+                                           name=tag_name, lifetime_start_ts=now_ts,
+                                           lifetime_end_ts=end_ts,
+                                           reversion=False, hidden=True)
+      TagToRepositoryTag.create(tag=created_tag, repository_tag=old_style_tag,
+                                repository=manifest.repository_id)
+
+      tag_manifest = TagManifest.create(tag=old_style_tag, digest=manifest.digest,
+                                        json_data=manifest.manifest_bytes)
+      TagManifestToManifest.create(tag_manifest=tag_manifest, manifest=manifest,
+                                   repository=manifest.repository_id)
+
+    return created_tag
+
+
 def retarget_tag(tag_name, manifest_id, is_reversion=False, now_ms=None):
   """ Creates or updates a tag with the specified name to point to the given manifest under
       its repository. If this action is a reversion to a previous manifest, is_reversion

data/model/oci/test/test_oci_tag.py

@@ -10,7 +10,8 @@ from data.model.oci.tag import (find_matching_tag, get_most_recent_tag, list_ali
                                 filter_to_visible_tags, list_repository_tag_history,
                                 get_expired_tag, get_tag, delete_tag,
                                 delete_tags_for_manifest, change_tag_expiration,
-                                set_tag_expiration_for_manifest, retarget_tag)
+                                set_tag_expiration_for_manifest, retarget_tag,
+                                create_temporary_tag)
 from data.model.repository import get_repository, create_repository
 
 from test.fixtures import *
@@ -207,6 +208,31 @@ def test_set_tag_expiration_for_manifest(initialized_db):
   assert updated_tag.lifetime_end_ms is not None
 
 
+def test_create_temporary_tag(initialized_db):
+  tag = Tag.get()
+  manifest = tag.manifest
+  assert manifest is not None
+
+  created = create_temporary_tag(manifest, 30)
+  assert created is not None
+
+  assert created.hidden
+  assert created.name.startswith('$temp-')
+  assert created.manifest == manifest
+  assert created.lifetime_end_ms is not None
+  assert created.lifetime_end_ms == (created.lifetime_start_ms + 30000)
+
+  # Verify old-style tables.
+  repository_tag = TagToRepositoryTag.get(tag=created).repository_tag
+  assert repository_tag.lifetime_start_ts == int(created.lifetime_start_ms / 1000)
+  assert repository_tag.lifetime_end_ts == int(created.lifetime_end_ms / 1000)
+  assert repository_tag.name == created.name
+  assert repository_tag.hidden
+
+  tag_manifest = TagManifest.get(tag=repository_tag)
+  assert TagManifestToManifest.get(tag_manifest=tag_manifest).manifest == manifest
+
+
 def test_retarget_tag(initialized_db):
   repo = get_repository('devtable', 'history')
   results, _ = list_repository_tag_history(repo, 1, 100, specific_tag_name='latest')