Fix firewall rule to support empty descritpion on update (#10950) (#7563)

[upstream:68ea8612247a46f4aac90e5b17eb7ecd6cb891b3]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/10950.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+compute: fixed `description` field in `google_compute_firewall` to support empty/null values on update
+```

google-beta/services/compute/resource_compute_firewall.go

@@ -466,7 +466,7 @@ func resourceComputeFirewallCreate(d *schema.ResourceData, meta interface{}) err
 	descriptionProp, err := expandComputeFirewallDescription(d.Get("description"), d, config)
 	if err != nil {
 		return err
-	} else if v, ok := d.GetOkExists("description"); !tpgresource.IsEmptyValue(reflect.ValueOf(descriptionProp)) && (ok || !reflect.DeepEqual(v, descriptionProp)) {
+	} else if v, ok := d.GetOkExists("description"); ok || !reflect.DeepEqual(v, descriptionProp) {
 		obj["description"] = descriptionProp
 	}
 	destinationRangesProp, err := expandComputeFirewallDestinationRanges(d.Get("destination_ranges"), d, config)
@@ -726,7 +726,7 @@ func resourceComputeFirewallUpdate(d *schema.ResourceData, meta interface{}) err
 	descriptionProp, err := expandComputeFirewallDescription(d.Get("description"), d, config)
 	if err != nil {
 		return err
-	} else if v, ok := d.GetOkExists("description"); !tpgresource.IsEmptyValue(reflect.ValueOf(v)) && (ok || !reflect.DeepEqual(v, descriptionProp)) {
+	} else if v, ok := d.GetOkExists("description"); ok || !reflect.DeepEqual(v, descriptionProp) {
 		obj["description"] = descriptionProp
 	}
 	destinationRangesProp, err := expandComputeFirewallDestinationRanges(d.Get("destination_ranges"), d, config)

google-beta/services/compute/resource_compute_firewall_test.go

@@ -38,6 +38,17 @@ func TestAccComputeFirewall_update(t *testing.T) {
 				ImportState:       true,
 				ImportStateVerify: true,
 			},
+			{
+				Config: testAccComputeFirewall_nullDescription(networkName, firewallName),
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("google_compute_firewall.foobar", "description", ""),
+				),
+			},
+			{
+				ResourceName:      "google_compute_firewall.foobar",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
 			{
 				Config: testAccComputeFirewall_basic(networkName, firewallName),
 			},
@@ -392,6 +403,28 @@ resource "google_compute_firewall" "foobar" {
 `, network, firewall)
 }
 
+func testAccComputeFirewall_nullDescription(network, firewall string) string {
+	return fmt.Sprintf(`
+resource "google_compute_network" "foobar" {
+  name                    = "%s"
+  auto_create_subnetworks = false
+}
+
+resource "google_compute_firewall" "foobar" {
+  name        = "%s"
+  description = null
+  network     = google_compute_network.foobar.self_link
+  source_tags = ["foo"]
+  target_tags = ["bar"]
+
+  allow {
+    protocol = "tcp"
+    ports    = ["80-255"]
+  }
+}
+`, network, firewall)
+}
+
 func testAccComputeFirewall_priority(network, firewall string, priority int) string {
 	return fmt.Sprintf(`
 resource "google_compute_network" "foobar" {