Fix permadiff on boot_disk.initialize_params.resource_policies (GoogleCloudPlatform#11753)

Co-authored-by: Zhenhua Li <[email protected]>

Author: karolgorc

mmv1/third_party/terraform/services/compute/resource_compute_instance.go.tmpl

@@ -317,6 +317,7 @@ func ResourceComputeInstance() *schema.Resource {
 										Elem:             &schema.Schema{Type: schema.TypeString},
 										Optional:         true,
 										ForceNew:         true,
+										Computed:         true,
 										AtLeastOneOf:     initializeParamsKeys,
 										DiffSuppressFunc: tpgresource.CompareSelfLinkRelativePaths,
 										MaxItems:         1,

mmv1/third_party/terraform/services/compute/resource_compute_instance_test.go.tmpl

@@ -372,6 +372,63 @@ func TestAccComputeInstance_diskResourcePolicies(t *testing.T) {
 	})
 }
 
+func TestAccComputeInstance_diskResourcePolicies_attachmentDiff(t *testing.T) {
+	t.Parallel()
+
+	var instance compute.Instance
+	context_1 := map[string]interface{}{
+		"instance_name": fmt.Sprintf("tf-test-%s", acctest.RandString(t, 10)),
+		"random_suffix": acctest.RandString(t, 10),
+		"comment":       "",
+	}
+	context_2 := map[string]interface{}{
+		"instance_name": context_1["instance_name"],
+		"random_suffix": context_1["random_suffix"],
+		"comment":       "#",
+	}
+
+	acctest.VcrTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.AccTestPreCheck(t) },
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories(t),
+		CheckDestroy:             testAccCheckComputeInstanceDestroyProducer(t),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccComputeInstance_diskResourcePoliciesAttachment(context_1),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckComputeInstanceExists(t, "google_compute_instance.foobar", &instance),
+				),
+			},
+			{
+				ResourceName:      "google_compute_instance.foobar",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+			{
+				Config: testAccComputeInstance_diskResourcePoliciesAttachment(context_2),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckComputeInstanceExists(t, "google_compute_instance.foobar", &instance),
+				),
+			},
+			{
+				ResourceName:      "google_compute_instance.foobar",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+			{
+				Config: testAccComputeInstance_diskResourcePoliciesOnePolicy(context_1),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckComputeInstanceExists(t, "google_compute_instance.foobar", &instance),
+				),
+			},
+			{
+				ResourceName:      "google_compute_instance.foobar",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+		},
+	})
+}
+
 func TestAccComputeInstance_machineTypeUrl(t *testing.T) {
 	t.Parallel()
 
@@ -5277,6 +5334,61 @@ resource "google_compute_instance" "foobar" {
 `, context)
 }
 
+func testAccComputeInstance_diskResourcePoliciesAttachment(context map[string]interface{}) string {
+	return acctest.Nprintf(`
+data "google_compute_image" "my_image" {
+  family  = "debian-11"
+  project = "debian-cloud"
+}
+
+resource "google_compute_resource_policy" "test-snapshot-policy" {
+  name    = "test-policy-%{random_suffix}"
+  snapshot_schedule_policy {
+    schedule {
+      hourly_schedule {
+        hours_in_cycle = 1
+        start_time     = "11:00"
+      }
+    }
+  }
+}
+
+resource "google_compute_resource_policy" "test-snapshot-policy2" {
+  name    = "test-policy2-%{random_suffix}"
+  snapshot_schedule_policy {
+    schedule {
+      hourly_schedule {
+        hours_in_cycle = 1
+        start_time     = "22:00"
+      }
+    }
+  }
+}
+
+resource "google_compute_instance" "foobar" {
+  name           = "%{instance_name}"
+  machine_type   = "e2-medium"
+  zone           = "us-central1-a"
+
+  boot_disk {
+    initialize_params {
+      image = data.google_compute_image.my_image.self_link
+    }
+  }
+
+  network_interface {
+    network = "default"
+  }
+}
+
+%{comment} resource "google_compute_disk_resource_policy_attachment" "attachment" {
+%{comment}   name = google_compute_resource_policy.test-snapshot-policy2.name
+%{comment}   disk = google_compute_instance.foobar.name
+%{comment}   zone = google_compute_instance.foobar.zone
+%{comment} }
+`, context)
+}
+
 func testAccComputeInstance_basic_deletionProtectionFalse(instance string) string {
 	return fmt.Sprintf(`
 data "google_compute_image" "my_image" {