terraform: module orphans

terraform/test-fixtures/transform-orphan-modules/main.tf

@@ -0,0 +1 @@
+resource "aws_instance" "foo" {}

terraform/transform_orphan.go

@@ -24,25 +24,31 @@ func (t *OrphanTransformer) Transform(g *Graph) error {
 		return nil
 	}
 
-	// Get the orphans from our configuration. This will only get resources.
-	orphans := state.Orphans(t.Config)
-	if len(orphans) == 0 {
-		return nil
-	}
-
-	// Go over each orphan and add it to the graph.
-	for _, k := range orphans {
+	// Go over each resource orphan and add it to the graph.
+	for _, k := range state.Orphans(t.Config) {
 		g.ConnectTo(
 			g.Add(&graphNodeOrphanResource{ResourceName: k}),
 			state.Resources[k].Dependencies)
 	}
 
-	// TODO: modules
+	// Go over each module orphan and add it to the graph
+	for _, path := range t.State.ModuleOrphans(g.Path, t.Config) {
+		g.Add(&graphNodeOrphanModule{Path: path})
+	}
 
 	return nil
 }
 
-// graphNodeOrphan is the graph vertex representing an orphan resource..
+// graphNodeOrphanModule is the graph vertex representing an orphan resource..
+type graphNodeOrphanModule struct {
+	Path []string
+}
+
+func (n *graphNodeOrphanModule) Name() string {
+	return fmt.Sprintf("module.%s (orphan)", n.Path[len(n.Path)-1])
+}
+
+// graphNodeOrphanResource is the graph vertex representing an orphan resource..
 type graphNodeOrphanResource struct {
 	ResourceName string
 }

terraform/transform_orphan_test.go

@@ -51,6 +51,57 @@ func TestOrphanTransformer(t *testing.T) {
 	}
 }
 
+func TestOrphanTransformer_modules(t *testing.T) {
+	mod := testModule(t, "transform-orphan-modules")
+	state := &State{
+		Modules: []*ModuleState{
+			&ModuleState{
+				Path: RootModulePath,
+				Resources: map[string]*ResourceState{
+					"aws_instance.foo": &ResourceState{
+						Type: "aws_instance",
+						Primary: &InstanceState{
+							ID: "foo",
+						},
+					},
+				},
+			},
+
+			// Orphan module
+			&ModuleState{
+				Path: []string{RootModuleName, "foo"},
+				Resources: map[string]*ResourceState{
+					"aws_instance.web": &ResourceState{
+						Type: "aws_instance",
+						Primary: &InstanceState{
+							ID: "foo",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	g := Graph{Path: RootModulePath}
+	{
+		tf := &ConfigTransformer{Module: mod}
+		if err := tf.Transform(&g); err != nil {
+			t.Fatalf("err: %s", err)
+		}
+	}
+
+	transform := &OrphanTransformer{State: state, Config: mod.Config()}
+	if err := transform.Transform(&g); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(g.String())
+	expected := strings.TrimSpace(testTransformOrphanModulesStr)
+	if actual != expected {
+		t.Fatalf("bad:\n\n%s", actual)
+	}
+}
+
 func TestOrphanTransformer_resourceDepends(t *testing.T) {
 	mod := testModule(t, "transform-orphan-basic")
 	state := &State{
@@ -105,6 +156,11 @@ aws_instance.db (orphan)
 aws_instance.web
 `
 
+const testTransformOrphanModulesStr = `
+aws_instance.foo
+module.foo (orphan)
+`
+
 const testTransformOrphanResourceDependsStr = `
 aws_instance.db (orphan)
   aws_instance.web