terraform: module orphans providers should inherit config

terraform/context_test.go

@@ -4375,6 +4375,54 @@ func TestContext2Apply_moduleDestroyOrder(t *testing.T) {
 	}
 }
 
+func TestContext2Apply_moduleOrphanProvider(t *testing.T) {
+	m := testModule(t, "apply-module-orphan-provider-inherit")
+	p := testProvider("aws")
+	p.ApplyFn = testApplyFn
+	p.DiffFn = testDiffFn
+
+	p.ConfigureFn = func(c *ResourceConfig) error {
+		if _, ok := c.Get("value"); !ok {
+			return fmt.Errorf("value is not found")
+		}
+
+		return nil
+	}
+
+	// Create a state with an orphan module
+	state := &State{
+		Modules: []*ModuleState{
+			&ModuleState{
+				Path: []string{"root", "child"},
+				Resources: map[string]*ResourceState{
+					"aws_instance.bar": &ResourceState{
+						Type: "aws_instance",
+						Primary: &InstanceState{
+							ID: "bar",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	ctx := testContext2(t, &ContextOpts{
+		Module: m,
+		State:  state,
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+	})
+
+	if _, err := ctx.Plan(); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if _, err := ctx.Apply(); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+}
+
 func TestContext2Apply_moduleVarResourceCount(t *testing.T) {
 	m := testModule(t, "apply-module-var-resource-count")
 	p := testProvider("aws")

terraform/graph_builder.go

@@ -117,14 +117,12 @@ func (b *BuiltinGraphBuilder) Steps(path []string) []GraphTransformer {
 		&MissingProviderTransformer{Providers: b.Providers},
 		&ProviderTransformer{},
 		&CloseProviderTransformer{},
-		&PruneProviderTransformer{},
 		&DisableProviderTransformer{},
 
 		// Provisioner-related transformations
 		&MissingProvisionerTransformer{Provisioners: b.Provisioners},
 		&ProvisionerTransformer{},
 		&CloseProvisionerTransformer{},
-		&PruneProvisionerTransformer{},
 
 		// Run our vertex-level transforms
 		&VertexTransformer{
@@ -154,6 +152,12 @@ func (b *BuiltinGraphBuilder) Steps(path []string) []GraphTransformer {
 	// We don't do the following for modules.
 	if len(path) <= 1 {
 		steps = append(steps,
+			// Prune the providers and provisioners. This must happen
+			// only once because flattened modules might depend on empty
+			// providers.
+			&PruneProviderTransformer{},
+			&PruneProvisionerTransformer{},
+
 			// Create the destruction nodes
 			&DestroyTransformer{FullDestroy: b.Destroy},
 			&CreateBeforeDestroyTransformer{},

terraform/test-fixtures/apply-module-orphan-provider-inherit/main.tf

@@ -0,0 +1,3 @@
+provider "aws" {
+    value = "foo"
+}