terraform: test for single index access of counts

terraform/context.go

@@ -260,7 +260,7 @@ func (c *Context) computeVars(raw *config.RawConfig) error {
 		case *config.ResourceVariable:
 			var attr string
 			var err error
-			if v.Multi {
+			if v.Multi && v.Index == -1 {
 				attr, err = c.computeResourceMultiVariable(v)
 			} else {
 				attr, err = c.computeResourceVariable(v)
@@ -281,11 +281,16 @@ func (c *Context) computeVars(raw *config.RawConfig) error {
 
 func (c *Context) computeResourceVariable(
 	v *config.ResourceVariable) (string, error) {
-	r, ok := c.state.Resources[v.ResourceId()]
+	id := v.ResourceId()
+	if v.Multi {
+		id = fmt.Sprintf("%s.%d", id, v.Index)
+	}
+
+	r, ok := c.state.Resources[id]
 	if !ok {
 		return "", fmt.Errorf(
 			"Resource '%s' not found for variable '%s'",
-			v.ResourceId(),
+			id,
 			v.FullKey())
 	}
 
@@ -294,7 +299,7 @@ func (c *Context) computeResourceVariable(
 		return "", fmt.Errorf(
 			"Resource '%s' does not have attribute '%s' "+
 				"for variable '%s'",
-			v.ResourceId(),
+			id,
 			v.Field,
 			v.FullKey())
 	}

terraform/context_test.go

@@ -564,6 +564,34 @@ func TestContextApply_outputMulti(t *testing.T) {
 	}
 }
 
+func TestContextApply_outputMultiIndex(t *testing.T) {
+	c := testConfig(t, "apply-output-multi-index")
+	p := testProvider("aws")
+	p.ApplyFn = testApplyFn
+	p.DiffFn = testDiffFn
+	ctx := testContext(t, &ContextOpts{
+		Config: c,
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+	})
+
+	if _, err := ctx.Plan(nil); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	state, err := ctx.Apply()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(state.String())
+	expected := strings.TrimSpace(testTerraformApplyOutputMultiIndexStr)
+	if actual != expected {
+		t.Fatalf("bad: \n%s", actual)
+	}
+}
+
 func TestContextApply_unknownAttribute(t *testing.T) {
 	c := testConfig(t, "apply-unknown")
 	p := testProvider("aws")

terraform/terraform_test.go

@@ -144,6 +144,29 @@ Outputs:
 foo_num = bar,bar,bar
 `
 
+const testTerraformApplyOutputMultiIndexStr = `
+aws_instance.bar.0:
+  ID = foo
+  foo = bar
+  type = aws_instance
+aws_instance.bar.1:
+  ID = foo
+  foo = bar
+  type = aws_instance
+aws_instance.bar.2:
+  ID = foo
+  foo = bar
+  type = aws_instance
+aws_instance.foo:
+  ID = foo
+  num = 2
+  type = aws_instance
+
+Outputs:
+
+foo_num = bar
+`
+
 const testTerraformApplyUnknownAttrStr = `
 aws_instance.foo:
   ID = foo

terraform/test-fixtures/apply-output-multi-index/main.tf

@@ -0,0 +1,12 @@
+resource "aws_instance" "foo" {
+    num = "2"
+}
+
+resource "aws_instance" "bar" {
+    foo = "bar"
+    count = 3
+}
+
+output "foo_num" {
+    value = "${aws_instance.bar.0.foo}"
+}