pkg/engine/inmemory/local_storage.go

@@ -136,3 +136,14 @@ func (s *inmemoryLocalStorage) DropAllOverrides(name chain.Name) error {
 	s.nameToResourceChains[name] = make(targetToChain)
 	return nil
 }
+
+func (s *inmemoryLocalStorage) ListOverrideDefinedTargets(name chain.Name) ([]engine.Target, error) {
+	s.guard.RLock()
+	defer s.guard.RUnlock()
+	ttc := s.nameToResourceChains[name]
+	var keys []engine.Target
+	for k := range ttc {
+		keys = append(keys, k)
+	}
+	return keys, nil
+}

pkg/engine/inmemory/local_storage_test.go

@@ -184,6 +184,9 @@ func TestListOverrides(t *testing.T) {
 		inmem.AddOverride(chain.Ingress, resrc, addChain)
 		l, _ := inmem.ListOverrides(chain.Ingress, resrc)
 		require.Len(t, l, 1)
+		targets, err := inmem.ListOverrideDefinedTargets(chain.Ingress)
+		require.NoError(t, err)
+		require.Equal(t, []engine.Target{resrc}, targets)
 	})
 
 	t.Run("list after drop", func(t *testing.T) {

pkg/engine/interface.go

@@ -24,6 +24,8 @@ type LocalOverrideStorage interface {
 	ListOverrides(name chain.Name, target Target) ([]*chain.Chain, error)
 
 	DropAllOverrides(name chain.Name) error
+
+	ListOverrideDefinedTargets(name chain.Name) ([]Target, error)
 }
 
 type TargetType rune