terraform: destroy plans work with modules

terraform/context.go

@@ -703,21 +703,34 @@ func (c *walkContext) planDestroyWalkFn() depgraph.WalkFunc {
 	result.init()
 
 	return func(n *depgraph.Noun) error {
-		rn, ok := n.Meta.(*GraphNodeResource)
-		if !ok {
-			return nil
-		}
+		switch m := n.Meta.(type) {
+		case *GraphNodeModule:
+			// Build another walkContext for this module and walk it.
+			wc := c.Context.walkContext(c.Operation, m.Path)
 
-		r := rn.Resource
+			// Set the graph to specifically walk this subgraph
+			wc.graph = m.Graph
+
+			// Preserve the meta
+			wc.Meta = c.Meta
+
+			return wc.Walk()
+		case *GraphNodeResource:
+			r := m.Resource
 			if r.State != nil && r.State.ID != "" {
 				log.Printf("[DEBUG] %s: Making for destroy", r.Id)
 
 				l.Lock()
 				defer l.Unlock()
-			result.Diff.RootModule().Resources[r.Id] = &InstanceDiff{Destroy: true}
+				md := result.Diff.ModuleByPath(c.Path)
+				if md == nil {
+					md = result.Diff.AddModule(c.Path)
+				}
+				md.Resources[r.Id] = &InstanceDiff{Destroy: true}
 			} else {
 				log.Printf("[DEBUG] %s: Not marking for destroy, no ID", r.Id)
 			}
+		}
 
 		return nil
 	}

terraform/context_test.go

@@ -2117,6 +2117,56 @@ func TestContextPlan_destroy(t *testing.T) {
 	}
 }
 
+func TestContextPlan_moduleDestroy(t *testing.T) {
+	m := testModule(t, "plan-module-destroy")
+	p := testProvider("aws")
+	p.DiffFn = testDiffFn
+	s := &State{
+		Modules: []*ModuleState{
+			&ModuleState{
+				Path: rootModulePath,
+				Resources: map[string]*ResourceState{
+					"aws_instance.foo": &ResourceState{
+						Type: "aws_instance",
+						Primary: &InstanceState{
+							ID: "bar",
+						},
+					},
+				},
+			},
+			&ModuleState{
+				Path: []string{"root", "child"},
+				Resources: map[string]*ResourceState{
+					"aws_instance.foo": &ResourceState{
+						Type: "aws_instance",
+						Primary: &InstanceState{
+							ID: "bar",
+						},
+					},
+				},
+			},
+		},
+	}
+	ctx := testContext(t, &ContextOpts{
+		Module: m,
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+		State: s,
+	})
+
+	plan, err := ctx.Plan(&PlanOpts{Destroy: true})
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(plan.String())
+	expected := strings.TrimSpace(testTerraformPlanModuleDestroyStr)
+	if actual != expected {
+		t.Fatalf("bad:\n%s", actual)
+	}
+}
+
 func TestContextPlan_diffVar(t *testing.T) {
 	m := testModule(t, "plan-diffvar")
 	p := testProvider("aws")

terraform/terraform_test.go

@@ -528,6 +528,24 @@ STATE:
 <no state>
 `
 
+const testTerraformPlanModuleDestroyStr = `
+DIFF:
+
+DESTROY: aws_instance.foo
+
+module.child:
+  DESTROY: aws_instance.foo
+
+STATE:
+
+aws_instance.foo:
+  ID = bar
+
+module.child:
+  aws_instance.foo:
+    ID = bar
+`
+
 const testTerraformPlanModuleInputStr = `
 DIFF:
 

terraform/test-fixtures/plan-module-destroy/child/main.tf

@@ -0,0 +1,3 @@
+resource "aws_instance" "foo" {
+    num = "2"
+}

terraform/test-fixtures/plan-module-destroy/main.tf

@@ -0,0 +1,7 @@
+module "child" {
+    source = "./child"
+}
+
+resource "aws_instance" "foo" {
+    num = "2"
+}