terraform: merge provider configs before validate [GH-1282]

terraform/context_test.go

@@ -2505,6 +2505,9 @@ func TestContext2Input_provider(t *testing.T) {
 		actual = c.Config["foo"]
 		return nil
 	}
+	p.ValidateFn = func(c *ResourceConfig) ([]string, []error) {
+		return nil, c.CheckSet([]string{"foo"})
+	}
 
 	if err := ctx.Input(InputModeStd); err != nil {
 		t.Fatalf("err: %s", err)

terraform/eval_provider.go

@@ -6,17 +6,18 @@ import (
 	"github.com/hashicorp/terraform/config"
 )
 
-// EvalConfigProvider is an EvalNode implementation that configures
-// a provider that is already initialized and retrieved.
-type EvalConfigProvider struct {
+// EvalBuildProviderConfig outputs a *ResourceConfig that is properly
+// merged with parents and inputs on top of what is configured in the file.
+type EvalBuildProviderConfig struct {
 	Provider string
 	Config   **ResourceConfig
+	Output   **ResourceConfig
 }
 
-func (n *EvalConfigProvider) Eval(ctx EvalContext) (interface{}, error) {
+func (n *EvalBuildProviderConfig) Eval(ctx EvalContext) (interface{}, error) {
 	cfg := *n.Config
 
-	// If we have a configuration set, then use that
+	// If we have a configuration set, then merge that in
 	if input := ctx.ProviderInput(n.Provider); input != nil {
 		rc, err := config.NewRawConfig(input)
 		if err != nil {
@@ -33,7 +34,19 @@ func (n *EvalConfigProvider) Eval(ctx EvalContext) (interface{}, error) {
 		cfg = NewResourceConfig(merged)
 	}
 
-	return nil, ctx.ConfigureProvider(n.Provider, cfg)
+	*n.Output = cfg
+	return nil, nil
+}
+
+// EvalConfigProvider is an EvalNode implementation that configures
+// a provider that is already initialized and retrieved.
+type EvalConfigProvider struct {
+	Provider string
+	Config   **ResourceConfig
+}
+
+func (n *EvalConfigProvider) Eval(ctx EvalContext) (interface{}, error) {
+	return nil, ctx.ConfigureProvider(n.Provider, *n.Config)
 }
 
 // EvalInitProvider is an EvalNode implementation that initializes a provider

terraform/eval_provider_test.go

@@ -5,6 +5,71 @@ import (
 	"testing"
 )
 
+func TestEvalBuildProviderConfig_impl(t *testing.T) {
+	var _ EvalNode = new(EvalBuildProviderConfig)
+}
+
+func TestEvalBuildProviderConfig(t *testing.T) {
+	config := testResourceConfig(t, map[string]interface{}{})
+	provider := "foo"
+
+	n := &EvalBuildProviderConfig{
+		Provider: provider,
+		Config:   &config,
+		Output:   &config,
+	}
+
+	ctx := &MockEvalContext{
+		ParentProviderConfigConfig: testResourceConfig(t, map[string]interface{}{
+			"foo": "bar",
+		}),
+		ProviderInputConfig: map[string]interface{}{
+			"bar": "baz",
+		},
+	}
+	if _, err := n.Eval(ctx); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	expected := map[string]interface{}{
+		"foo": "bar",
+		"bar": "baz",
+	}
+	if !reflect.DeepEqual(config.Raw, expected) {
+		t.Fatalf("bad: %#v", config.Raw)
+	}
+}
+
+func TestEvalBuildProviderConfig_parentPriority(t *testing.T) {
+	config := testResourceConfig(t, map[string]interface{}{})
+	provider := "foo"
+
+	n := &EvalBuildProviderConfig{
+		Provider: provider,
+		Config:   &config,
+		Output:   &config,
+	}
+
+	ctx := &MockEvalContext{
+		ParentProviderConfigConfig: testResourceConfig(t, map[string]interface{}{
+			"foo": "bar",
+		}),
+		ProviderInputConfig: map[string]interface{}{
+			"foo": "baz",
+		},
+	}
+	if _, err := n.Eval(ctx); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	expected := map[string]interface{}{
+		"foo": "bar",
+	}
+	if !reflect.DeepEqual(config.Raw, expected) {
+		t.Fatalf("bad: %#v", config.Raw)
+	}
+}
+
 func TestEvalConfigProvider_impl(t *testing.T) {
 	var _ EvalNode = new(EvalConfigProvider)
 }

terraform/eval_validate.go

@@ -57,21 +57,14 @@ RETURN:
 // EvalValidateProvider is an EvalNode implementation that validates
 // the configuration of a resource.
 type EvalValidateProvider struct {
-	ProviderName string
-	Provider     *ResourceProvider
-	Config       **ResourceConfig
+	Provider *ResourceProvider
+	Config   **ResourceConfig
 }
 
 func (n *EvalValidateProvider) Eval(ctx EvalContext) (interface{}, error) {
 	provider := *n.Provider
 	config := *n.Config
 
-	// Get the parent configuration if there is one
-	if parent := ctx.ParentProviderConfig(n.ProviderName); parent != nil {
-		merged := parent.raw.Merge(config.raw)
-		config = NewResourceConfig(merged)
-	}
-
 	warns, errs := provider.Validate(config)
 	if len(warns) == 0 && len(errs) == 0 {
 		return nil, nil

terraform/evaltree_provider.go

@@ -44,10 +44,14 @@ func ProviderEvalTree(n string, config *config.RawConfig) EvalNode {
 					Config: config,
 					Output: &resourceConfig,
 				},
+				&EvalBuildProviderConfig{
+					Provider: n,
+					Config:   &resourceConfig,
+					Output:   &resourceConfig,
+				},
 				&EvalValidateProvider{
-					ProviderName: n,
-					Provider:     &provider,
-					Config:       &resourceConfig,
+					Provider: &provider,
+					Config:   &resourceConfig,
 				},
 				&EvalConfigProvider{
 					Provider: n,