Another huge batch of registry v2 changes

Add patch support and resumeable sha
Implement all actual registry methods
Add a simple database generation option

endpoints/v2/tag.py

@@ -0,0 +1,19 @@
+# XXX This code is not yet ready to be run in production, and should remain disabled until such
+# XXX time as this notice is removed.
+
+from flask import jsonify
+
+from endpoints.v2 import v2_bp, require_repo_read
+from auth.jwt_auth import process_jwt_auth
+from endpoints.decorators import anon_protect
+from data import model
+
+@v2_bp.route('/<namespace>/<repo_name>/tags/list', methods=['GET'])
+@process_jwt_auth
+@require_repo_read
+@anon_protect
+def list_all_tags(namespace, repo_name):
+  return jsonify({
+    'name': '{0}/{1}'.format(namespace, repo_name),
+    'tags': [tag.name for tag in model.tag.list_repository_tags(namespace, repo_name)],
+  })