Merge branch 'b-data-resource-destroy'

terraform/eval_read_data.go

@@ -12,12 +12,14 @@ type EvalReadDataDiff struct {
 	OutputState **InstanceState
 	Config      **ResourceConfig
 	Info        *InstanceInfo
+
+	// Set Previous when re-evaluating diff during apply, to ensure that
+	// the "Destroy" flag is preserved.
+	Previous **InstanceDiff
 }
 
 func (n *EvalReadDataDiff) Eval(ctx EvalContext) (interface{}, error) {
 	// TODO: test
-	provider := *n.Provider
-	config := *n.Config
 
 	err := ctx.Hook(func(h Hook) (HookAction, error) {
 		return h.PreDiff(n.Info, nil)
@@ -26,6 +28,16 @@ func (n *EvalReadDataDiff) Eval(ctx EvalContext) (interface{}, error) {
 		return nil, err
 	}
 
+	var diff *InstanceDiff
+
+	if n.Previous != nil && *n.Previous != nil && (*n.Previous).Destroy {
+		// If we're re-diffing for a diff that was already planning to
+		// destroy, then we'll just continue with that plan.
+		diff = &InstanceDiff{Destroy: true}
+	} else {
+		provider := *n.Provider
+		config := *n.Config
+
 		diff, err := provider.ReadDataDiff(n.Info, config)
 		if err != nil {
 			return nil, err
@@ -42,6 +54,7 @@ func (n *EvalReadDataDiff) Eval(ctx EvalContext) (interface{}, error) {
 			RequiresNew: true,
 			Type:        DiffAttrOutput,
 		}
+	}
 
 	err = ctx.Hook(func(h Hook) (HookAction, error) {
 		return h.PostDiff(n.Info, diff)
@@ -83,7 +96,7 @@ func (n *EvalReadDataApply) Eval(ctx EvalContext) (interface{}, error) {
 	// If the diff is for *destroying* this resource then we'll
 	// just drop its state and move on, since data resources don't
 	// support an actual "destroy" action.
-	if diff.Destroy {
+	if diff != nil && diff.Destroy {
 		if n.Output != nil {
 			*n.Output = nil
 		}

terraform/transform_resource.go

@@ -810,6 +810,7 @@ func (n *graphNodeExpandedResource) dataResourceEvalNodes(resource *Resource, in
 				&EvalReadDataDiff{
 					Info:     info,
 					Config:   &config,
+					Previous: &diff,
 					Provider: &provider,
 					Output:   &diff,
 				},