terraform: provisioner config is properly interpolated

terraform/context_test.go

@@ -2137,7 +2137,7 @@ func TestContext2Validate_provisionerConfig_good(t *testing.T) {
 		if c == nil {
 			t.Fatalf("missing resource config for provisioner")
 		}
-		return nil, nil
+		return nil, c.CheckSet([]string{"command"})
 	}
 	c := testContext2(t, &ContextOpts{
 		Module: m,

terraform/test-fixtures/validate-bad-prov-conf/main.tf

@@ -3,5 +3,7 @@ provider "aws" {
 }
 
 resource "aws_instance" "test" {
-    provisioner "shell" {}
+    provisioner "shell" {
+        command = "foo"
+    }
 }

terraform/transform_resource.go

@@ -137,6 +137,10 @@ func (n *graphNodeExpandedResource) EvalTree() EvalNode {
 		vseq.Nodes = append(vseq.Nodes, &EvalGetProvisioner{
 			Name:   p.Type,
 			Output: &provisioner,
+		}, &EvalInterpolate{
+			Config:   p.RawConfig,
+			Resource: resource,
+			Output:   &resourceConfig,
 		}, &EvalValidateProvisioner{
 			Provisioner: &provisioner,
 			Config:      &resourceConfig,