provider/aws: Fix reading auto scaling group termination policies

builtin/providers/aws/resource_aws_autoscaling_group.go

@@ -251,7 +251,16 @@ func resourceAwsAutoscalingGroupRead(d *schema.ResourceData, meta interface{}) e
 	d.Set("name", g.AutoScalingGroupName)
 	d.Set("tag", g.Tags)
 	d.Set("vpc_zone_identifier", strings.Split(*g.VPCZoneIdentifier, ","))
-	d.Set("termination_policies", g.TerminationPolicies)
+
+	// If no termination polices are explicitly configured and the upstream state
+	// is only using the "Default" policy, clear the state to make it consistent
+	// with the default AWS create API behavior.
+	_, ok := d.GetOk("termination_policies")
+	if !ok && len(g.TerminationPolicies) == 1 && *g.TerminationPolicies[0] == "Default" {
+		d.Set("termination_policies", []interface{}{})
+	} else {
+		d.Set("termination_policies", flattenStringList(g.TerminationPolicies))
+	}
 
 	return nil
 }
@@ -312,18 +321,11 @@ func resourceAwsAutoscalingGroupUpdate(d *schema.ResourceData, meta interface{})
 	if d.HasChange("termination_policies") {
 		// If the termination policy is set to null, we need to explicitly set
 		// it back to "Default", or the API won't reset it for us.
-		// This means GetOk() will fail us on the zero check.
-		v := d.Get("termination_policies")
-		if len(v.([]interface{})) > 0 {
+		if v, ok := d.GetOk("termination_policies"); ok && len(v.([]interface{})) > 0 {
 			opts.TerminationPolicies = expandStringList(v.([]interface{}))
 		} else {
-			// Policies is a slice of string pointers, so build one.
-			// Maybe there's a better idiom for this?
 			log.Printf("[DEBUG] Explictly setting null termination policy to 'Default'")
-			pol := "Default"
-			s := make([]*string, 1, 1)
-			s[0] = &pol
-			opts.TerminationPolicies = s
+			opts.TerminationPolicies = aws.StringSlice([]string{"Default"})
 		}
 	}
 

builtin/providers/aws/resource_aws_autoscaling_group_test.go

@@ -91,6 +91,51 @@ func TestAccAWSAutoScalingGroup_autoGeneratedName(t *testing.T) {
 	})
 }
 
+func TestAccAWSAutoScalingGroup_terminationPolicies(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckAWSAutoScalingGroupDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccAWSAutoScalingGroupConfig_terminationPoliciesEmpty,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr(
+						"aws_autoscaling_group.bar", "termination_policies.#", "0"),
+				),
+			},
+
+			resource.TestStep{
+				Config: testAccAWSAutoScalingGroupConfig_terminationPoliciesUpdate,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr(
+						"aws_autoscaling_group.bar", "termination_policies.#", "1"),
+					resource.TestCheckResourceAttr(
+						"aws_autoscaling_group.bar", "termination_policies.0", "OldestInstance"),
+				),
+			},
+
+			resource.TestStep{
+				Config: testAccAWSAutoScalingGroupConfig_terminationPoliciesExplicitDefault,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr(
+						"aws_autoscaling_group.bar", "termination_policies.#", "1"),
+					resource.TestCheckResourceAttr(
+						"aws_autoscaling_group.bar", "termination_policies.0", "Default"),
+				),
+			},
+
+			resource.TestStep{
+				Config: testAccAWSAutoScalingGroupConfig_terminationPoliciesEmpty,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr(
+						"aws_autoscaling_group.bar", "termination_policies.#", "0"),
+				),
+			},
+		},
+	})
+}
+
 func TestAccAWSAutoScalingGroup_tags(t *testing.T) {
 	var group autoscaling.Group
 
@@ -415,6 +460,56 @@ resource "aws_autoscaling_group" "bar" {
 }
 `
 
+const testAccAWSAutoScalingGroupConfig_terminationPoliciesEmpty = `
+resource "aws_launch_configuration" "foobar" {
+  image_id = "ami-21f78e11"
+  instance_type = "t1.micro"
+}
+
+resource "aws_autoscaling_group" "bar" {
+  availability_zones = ["us-west-2a"]
+  max_size = 0
+  min_size = 0
+  desired_capacity = 0
+
+  launch_configuration = "${aws_launch_configuration.foobar.name}"
+}
+`
+
+const testAccAWSAutoScalingGroupConfig_terminationPoliciesExplicitDefault = `
+resource "aws_launch_configuration" "foobar" {
+  image_id = "ami-21f78e11"
+  instance_type = "t1.micro"
+}
+
+resource "aws_autoscaling_group" "bar" {
+  availability_zones = ["us-west-2a"]
+  max_size = 0
+  min_size = 0
+  desired_capacity = 0
+  termination_policies = ["Default"]
+
+  launch_configuration = "${aws_launch_configuration.foobar.name}"
+}
+`
+
+const testAccAWSAutoScalingGroupConfig_terminationPoliciesUpdate = `
+resource "aws_launch_configuration" "foobar" {
+  image_id = "ami-21f78e11"
+  instance_type = "t1.micro"
+}
+
+resource "aws_autoscaling_group" "bar" {
+  availability_zones = ["us-west-2a"]
+  max_size = 0
+  min_size = 0
+  desired_capacity = 0
+  termination_policies = ["OldestInstance"]
+
+  launch_configuration = "${aws_launch_configuration.foobar.name}"
+}
+`
+
 const testAccAWSAutoScalingGroupConfig = `
 resource "aws_launch_configuration" "foobar" {
   image_id = "ami-21f78e11"