provider/aws: Support scratch volumes in ecs_task_definition

builtin/providers/aws/resource_aws_ecs_task_definition.go

@@ -58,7 +58,7 @@ func resourceAwsEcsTaskDefinition() *schema.Resource {
 
 						"host_path": &schema.Schema{
 							Type:     schema.TypeString,
-							Required: true,
+							Optional: true,
 						},
 					},
 				},

builtin/providers/aws/resource_aws_ecs_task_definition_test.go

@@ -32,6 +32,23 @@ func TestAccAWSEcsTaskDefinition_basic(t *testing.T) {
 	})
 }
 
+// Regression for https://github.com/hashicorp/terraform/issues/2370
+func TestAccAWSEcsTaskDefinition_withScratchVolume(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckAWSEcsTaskDefinitionDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccAWSEcsTaskDefinitionWithScratchVolume,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSEcsTaskDefinitionExists("aws_ecs_task_definition.sleep"),
+				),
+			},
+		},
+	})
+}
+
 func testAccCheckAWSEcsTaskDefinitionDestroy(s *terraform.State) error {
 	conn := testAccProvider.Meta().(*AWSClient).ecsconn
 
@@ -116,6 +133,28 @@ TASK_DEFINITION
 }
 `
 
+var testAccAWSEcsTaskDefinitionWithScratchVolume = `
+resource "aws_ecs_task_definition" "sleep" {
+  family = "terraform-acc-sc-volume-test"
+  container_definitions = <<TASK_DEFINITION
+[
+  {
+    "name": "sleep",
+    "image": "busybox",
+    "cpu": 10,
+    "command": ["sleep","360"],
+    "memory": 10,
+    "essential": true
+  }
+]
+TASK_DEFINITION
+
+  volume {
+    name = "database_scratch"
+  }
+}
+`
+
 var testAccAWSEcsTaskDefinitionModifier = `
 resource "aws_ecs_task_definition" "jenkins" {
   family = "terraform-acc-test"

builtin/providers/aws/structure.go

@@ -62,9 +62,13 @@ func expandEcsVolumes(configured []interface{}) ([]*ecs.Volume, error) {
 
 		l := &ecs.Volume{
 			Name: aws.String(data["name"].(string)),
-			Host: &ecs.HostVolumeProperties{
-				SourcePath: aws.String(data["host_path"].(string)),
-			},
+		}
+
+		hostPath := data["host_path"].(string)
+		if hostPath != "" {
+			l.Host = &ecs.HostVolumeProperties{
+				SourcePath: aws.String(hostPath),
+			}
 		}
 
 		volumes = append(volumes, l)
@@ -315,8 +319,12 @@ func flattenEcsVolumes(list []*ecs.Volume) []map[string]interface{} {
 	for _, volume := range list {
 		l := map[string]interface{}{
 			"name": *volume.Name,
-			"host_path": *volume.Host.SourcePath,
 		}
+
+		if volume.Host.SourcePath != nil {
+			l["host_path"] = *volume.Host.SourcePath
+		}
+
 		result = append(result, l)
 	}
 	return result