add network update support

ibm/service/power/resource_ibm_pi_network.go

@@ -34,6 +34,7 @@ func ResourceIBMPINetwork() *schema.Resource {
 
 		Timeouts: &schema.ResourceTimeout{
 			Create: schema.DefaultTimeout(60 * time.Minute),
+			Update: schema.DefaultTimeout(60 * time.Minute),
 			Delete: schema.DefaultTimeout(60 * time.Minute),
 		},
 
@@ -181,7 +182,34 @@ func resourceIBMPINetworkRead(ctx context.Context, d *schema.ResourceData, meta
 }
 
 func resourceIBMPINetworkUpdate(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
-	return nil
+	sess, err := meta.(conns.ClientSession).IBMPISession()
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	cloudInstanceID, networkID, err := splitID(d.Id())
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	if d.HasChanges(helpers.PINetworkName, helpers.PINetworkDNS) {
+		networkC := st.NewIBMPINetworkClient(ctx, sess, cloudInstanceID)
+		body := &models.NetworkUpdate{
+			DNSServers: flex.ExpandStringList((d.Get(helpers.PINetworkDNS).(*schema.Set)).List()),
+		}
+
+		if d.HasChange(helpers.PINetworkName) {
+			name := d.Get(helpers.PINetworkName).(string)
+			body.Name = &name
+		}
+
+		_, err = networkC.Update(networkID, body)
+		if err != nil {
+			return diag.FromErr(err)
+		}
+	}
+
+	return resourceIBMPINetworkRead(ctx, d, meta)
 }
 
 func resourceIBMPINetworkDelete(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {

ibm/service/power/resource_ibm_pi_network_test.go

@@ -34,6 +34,16 @@ func TestAccIBMPINetworkbasic(t *testing.T) {
 						"ibm_pi_network.power_networks", "pi_network_name", name),
 				),
 			},
+			{
+				Config: testAccCheckIBMPINetworkConfigUpdateDNS(name),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckIBMPINetworkExists("ibm_pi_network.power_networks"),
+					resource.TestCheckResourceAttr(
+						"ibm_pi_network.power_networks", "pi_network_name", name),
+					resource.TestCheckResourceAttr(
+						"ibm_pi_network.power_networks", "pi_dns.#", "1"),
+				),
+			},
 		},
 	})
 }
@@ -100,3 +110,14 @@ func testAccCheckIBMPINetworkConfig(name string) string {
 		}
 	`, acc.Pi_cloud_instance_id, name)
 }
+
+func testAccCheckIBMPINetworkConfigUpdateDNS(name string) string {
+	return fmt.Sprintf(`
+		resource "ibm_pi_network" "power_networks" {
+			pi_cloud_instance_id = "%s"
+			pi_network_name      = "%s"
+			pi_network_type      = "pub-vlan"
+			pi_dns               = ["127.0.0.1"]
+		}
+	`, acc.Pi_cloud_instance_id, name)
+}

website/docs/r/pi_network.html.markdown

@@ -44,6 +44,7 @@ resource "ibm_pi_network" "power_networks" {
 The `ibm_pi_network` provides the following [Timeouts](https://www.terraform.io/docs/language/resources/syntax.html) configuration options:
 
 - **create** - (Default 60 minutes) Used for creating a network.
+- **update** - (Default 60 minutes) Used for updating a network.
 - **delete** - (Default 60 minutes) Used for deleting a network.
 
 ## Argument reference