provider/aws: Fixed the aws_vpc enable_dns_support handling on creation

builtin/providers/aws/resource_aws_vpc.go

@@ -23,59 +23,59 @@ func resourceAwsVpc() *schema.Resource {
 		},
 
 		Schema: map[string]*schema.Schema{
-			"cidr_block": &schema.Schema{
+			"cidr_block": {
 				Type:         schema.TypeString,
 				Required:     true,
 				ForceNew:     true,
 				ValidateFunc: validateCIDRNetworkAddress,
 			},
 
-			"instance_tenancy": &schema.Schema{
+			"instance_tenancy": {
 				Type:     schema.TypeString,
 				Optional: true,
 				ForceNew: true,
 				Computed: true,
 			},
 
-			"enable_dns_hostnames": &schema.Schema{
+			"enable_dns_hostnames": {
 				Type:     schema.TypeBool,
 				Optional: true,
 				Computed: true,
 			},
 
-			"enable_dns_support": &schema.Schema{
+			"enable_dns_support": {
 				Type:     schema.TypeBool,
 				Optional: true,
 				Computed: true,
 			},
 
-			"enable_classiclink": &schema.Schema{
+			"enable_classiclink": {
 				Type:     schema.TypeBool,
 				Optional: true,
 				Computed: true,
 			},
 
-			"main_route_table_id": &schema.Schema{
+			"main_route_table_id": {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
 
-			"default_network_acl_id": &schema.Schema{
+			"default_network_acl_id": {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
 
-			"dhcp_options_id": &schema.Schema{
+			"dhcp_options_id": {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
 
-			"default_security_group_id": &schema.Schema{
+			"default_security_group_id": {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
 
-			"default_route_table_id": &schema.Schema{
+			"default_route_table_id": {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
@@ -260,7 +260,9 @@ func resourceAwsVpcUpdate(d *schema.ResourceData, meta interface{}) error {
 		d.SetPartial("enable_dns_support")
 	}
 
-	if d.HasChange("enable_dns_support") {
+	_, hasEnableDnsSupportOption := d.GetOk("enable_dns_support")
+
+	if !hasEnableDnsSupportOption || d.HasChange("enable_dns_support") {
 		val := d.Get("enable_dns_support").(bool)
 		modifyOpts := &ec2.ModifyVpcAttributeInput{
 			VpcId: &vpcid,

builtin/providers/aws/resource_aws_vpc_test.go

@@ -19,7 +19,7 @@ func TestAccAWSVpc_basic(t *testing.T) {
 		Providers:    testAccProviders,
 		CheckDestroy: testAccCheckVpcDestroy,
 		Steps: []resource.TestStep{
-			resource.TestStep{
+			{
 				Config: testAccVpcConfig,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpcExists("aws_vpc.foo", &vpc),
@@ -42,7 +42,7 @@ func TestAccAWSVpc_dedicatedTenancy(t *testing.T) {
 		Providers:    testAccProviders,
 		CheckDestroy: testAccCheckVpcDestroy,
 		Steps: []resource.TestStep{
-			resource.TestStep{
+			{
 				Config: testAccVpcDedicatedConfig,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpcExists("aws_vpc.bar", &vpc),
@@ -62,7 +62,7 @@ func TestAccAWSVpc_tags(t *testing.T) {
 		Providers:    testAccProviders,
 		CheckDestroy: testAccCheckVpcDestroy,
 		Steps: []resource.TestStep{
-			resource.TestStep{
+			{
 				Config: testAccVpcConfigTags,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpcExists("aws_vpc.foo", &vpc),
@@ -73,7 +73,7 @@ func TestAccAWSVpc_tags(t *testing.T) {
 				),
 			},
 
-			resource.TestStep{
+			{
 				Config: testAccVpcConfigTagsUpdate,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpcExists("aws_vpc.foo", &vpc),
@@ -93,7 +93,7 @@ func TestAccAWSVpc_update(t *testing.T) {
 		Providers:    testAccProviders,
 		CheckDestroy: testAccCheckVpcDestroy,
 		Steps: []resource.TestStep{
-			resource.TestStep{
+			{
 				Config: testAccVpcConfig,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpcExists("aws_vpc.foo", &vpc),
@@ -102,7 +102,7 @@ func TestAccAWSVpc_update(t *testing.T) {
 						"aws_vpc.foo", "cidr_block", "10.1.0.0/16"),
 				),
 			},
-			resource.TestStep{
+			{
 				Config: testAccVpcConfigUpdate,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpcExists("aws_vpc.foo", &vpc),
@@ -195,7 +195,7 @@ func TestAccAWSVpc_bothDnsOptionsSet(t *testing.T) {
 		Providers:    testAccProviders,
 		CheckDestroy: testAccCheckVpcDestroy,
 		Steps: []resource.TestStep{
-			resource.TestStep{
+			{
 				Config: testAccVpcConfig_BothDnsOptions,
 				Check: resource.ComposeTestCheckFunc(
 					resource.TestCheckResourceAttr(
@@ -208,13 +208,31 @@ func TestAccAWSVpc_bothDnsOptionsSet(t *testing.T) {
 	})
 }
 
+// https://github.com/hashicorp/terraform/issues/10168
+func TestAccAWSVpc_DisabledDnsSupport(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckVpcDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccVpcConfig_DisabledDnsSupport,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr(
+						"aws_vpc.bar", "enable_dns_support", "false"),
+				),
+			},
+		},
+	})
+}
+
 func TestAccAWSVpc_classiclinkOptionSet(t *testing.T) {
 	resource.Test(t, resource.TestCase{
 		PreCheck:     func() { testAccPreCheck(t) },
 		Providers:    testAccProviders,
 		CheckDestroy: testAccCheckVpcDestroy,
 		Steps: []resource.TestStep{
-			resource.TestStep{
+			{
 				Config: testAccVpcConfig_ClassiclinkOption,
 				Check: resource.ComposeTestCheckFunc(
 					resource.TestCheckResourceAttr(
@@ -278,6 +296,18 @@ resource "aws_vpc" "bar" {
 }
 `
 
+const testAccVpcConfig_DisabledDnsSupport = `
+provider "aws" {
+	region = "eu-central-1"
+}
+
+resource "aws_vpc" "bar" {
+	cidr_block = "10.2.0.0/16"
+
+	enable_dns_support = false
+}
+`
+
 const testAccVpcConfig_ClassiclinkOption = `
 resource "aws_vpc" "bar" {
 	cidr_block = "172.2.0.0/16"