command/meta: validate config immediately

* config: test for validating multi-vars (passes)

* command/plan: test invalid run

* command/meta: validate module on load

command/command.go

@@ -2,6 +2,7 @@ package command
 
 import (
 	"fmt"
+	"log"
 
 	"github.com/hashicorp/terraform/terraform"
 	"github.com/mitchellh/cli"
@@ -27,7 +28,11 @@ const DefaultBackupExtension = ".backup"
 const DefaultParallelism = 10
 
 func validateContext(ctx *terraform.Context, ui cli.Ui) bool {
-	if ws, es := ctx.Validate(); len(ws) > 0 || len(es) > 0 {
+	log.Println("[INFO] Validating the context...")
+	ws, es := ctx.Validate()
+	log.Printf("[INFO] Validation result: %d warnings, %d errors", len(ws), len(es))
+
+	if len(ws) > 0 || len(es) > 0 {
 		ui.Output(
 			"There are warnings and/or errors related to your configuration. Please\n" +
 				"fix these before continuing.\n")

command/meta.go

@@ -165,6 +165,11 @@ func (m *Meta) Context(copts contextOpts) (*terraform.Context, bool, error) {
 		return nil, false, fmt.Errorf("Error downloading modules: %s", err)
 	}
 
+	// Validate the module right away
+	if err := mod.Validate(); err != nil {
+		return nil, false, err
+	}
+
 	opts.Module = mod
 	opts.Parallelism = copts.Parallelism
 	opts.State = state.State()

command/plan_test.go

@@ -395,6 +395,40 @@ func TestPlan_statePast(t *testing.T) {
 	}
 }
 
+func TestPlan_validate(t *testing.T) {
+	// This is triggered by not asking for input so we have to set this to false
+	test = false
+	defer func() { test = true }()
+
+	cwd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	if err := os.Chdir(testFixturePath("plan-invalid")); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	defer os.Chdir(cwd)
+
+	p := testProvider()
+	ui := new(cli.MockUi)
+	c := &PlanCommand{
+		Meta: Meta{
+			ContextOpts: testCtxConfig(p),
+			Ui:          ui,
+		},
+	}
+
+	args := []string{}
+	if code := c.Run(args); code != 1 {
+		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
+	}
+
+	actual := ui.ErrorWriter.String()
+	if !strings.Contains(actual, "can't reference") {
+		t.Fatalf("bad: %s", actual)
+	}
+}
+
 func TestPlan_vars(t *testing.T) {
 	p := testProvider()
 	ui := new(cli.MockUi)

command/push_test.go

@@ -766,7 +766,6 @@ func pushTFVars() []atlas.TFVar {
 		{"bar", "foo", false},
 		{"baz", `{
   A = "a"
-  interp = "${file("t.txt")}"
 }`, true},
 		{"fob", `["a", "quotes \"in\" quotes"]`, true},
 		{"foo", "bar", false},

command/test-fixtures/plan-invalid/main.tf

@@ -0,0 +1,7 @@
+resource "test_instance" "foo" {
+    count = 5
+}
+
+resource "test_instance" "bar" {
+    count = "${length(test_instance.foo.*.id)}"
+}

command/test-fixtures/push-tfvars/main.tf

@@ -7,7 +7,6 @@ variable "baz" {
 
   default = {
     "A"    = "a"
-    interp = "${file("t.txt")}"
   }
 }
 

config/config_test.go

@@ -195,6 +195,13 @@ func TestConfigValidate_countResourceVar(t *testing.T) {
 	}
 }
 
+func TestConfigValidate_countResourceVarMulti(t *testing.T) {
+	c := testConfig(t, "validate-count-resource-var-multi")
+	if err := c.Validate(); err == nil {
+		t.Fatal("should not be valid")
+	}
+}
+
 func TestConfigValidate_countUserVar(t *testing.T) {
 	c := testConfig(t, "validate-count-user-var")
 	if err := c.Validate(); err != nil {

config/test-fixtures/validate-count-resource-var-multi/main.tf

@@ -0,0 +1,5 @@
+resource "aws_instance" "foo" {}
+
+resource "aws_instance" "web" {
+    count = "${length(aws_instance.foo.*.bar)}"
+}