terraform: module inputs/vars can be non-strings [GH-819]

terraform/context_test.go

@@ -3298,6 +3298,35 @@ func TestContext2Apply_moduleVarResourceCount(t *testing.T) {
 	}
 }
 
+// GH-819
+func TestContext2Apply_moduleBool(t *testing.T) {
+	m := testModule(t, "apply-module-bool")
+	p := testProvider("aws")
+	p.ApplyFn = testApplyFn
+	p.DiffFn = testDiffFn
+	ctx := testContext2(t, &ContextOpts{
+		Module: m,
+		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(testTerraformApplyModuleBoolStr)
+	if actual != expected {
+		t.Fatalf("bad: \n%s", actual)
+	}
+}
+
 func TestContext2Apply_multiProvider(t *testing.T) {
 	m := testModule(t, "apply-multi-provider")
 	p := testProvider("aws")

terraform/eval_variable.go

@@ -1,7 +1,11 @@
 package terraform
 
 import (
+	"fmt"
+
+	"github.com/hashicorp/errwrap"
 	"github.com/hashicorp/terraform/config"
+	"github.com/mitchellh/mapstructure"
 )
 
 // EvalSetVariables is an EvalNode implementation that sets the variables
@@ -34,7 +38,13 @@ func (n *EvalVariableBlock) Eval(ctx EvalContext) (interface{}, error) {
 	// Get our configuration
 	rc := *n.Config
 	for k, v := range rc.Config {
-		n.Variables[k] = v.(string)
+		var vStr string
+		if err := mapstructure.WeakDecode(v, &vStr); err != nil {
+			return nil, errwrap.Wrapf(fmt.Sprintf(
+				"%s: error reading value: {{err}}", k), err)
+		}
+
+		n.Variables[k] = vStr
 	}
 	for k, _ := range rc.Raw {
 		if _, ok := n.Variables[k]; !ok {

terraform/state.go

@@ -231,7 +231,12 @@ func (s *State) String() string {
 
 		s := bufio.NewScanner(strings.NewReader(mStr))
 		for s.Scan() {
-			buf.WriteString(fmt.Sprintf("  %s\n", s.Text()))
+			text := s.Text()
+			if text != "" {
+				text = "  " + text
+			}
+
+			buf.WriteString(fmt.Sprintf("%s\n", text))
 		}
 	}
 

terraform/terraform_test.go

@@ -285,6 +285,22 @@ module.child:
     type = aws_instance
 `
 
+const testTerraformApplyModuleBoolStr = `
+aws_instance.bar:
+  ID = foo
+  foo = 1
+  type = aws_instance
+
+  Dependencies:
+    module.child
+
+module.child:
+  <no state>
+  Outputs:
+
+  leader = 1
+`
+
 const testTerraformApplyMultiProviderStr = `
 aws_instance.bar:
   ID = foo

terraform/test-fixtures/apply-module-bool/child/main.tf

@@ -0,0 +1,7 @@
+variable "leader" {
+    default = false
+}
+
+output "leader" {
+    value = "${var.leader}"
+}

terraform/test-fixtures/apply-module-bool/main.tf

@@ -0,0 +1,8 @@
+module "child" {
+    source = "./child"
+    leader = true
+}
+
+resource "aws_instance" "bar" {
+    foo = "${module.child.leader}"
+}