Support additional_unattend_content part of azurerm_orchestrated_virtual_machine_scale_set resource

internal/services/compute/orchestrated_virtual_machine_scale_set.go

@@ -65,8 +65,7 @@ func OrchestratedVirtualMachineScaleSetWindowsConfigurationSchema() *pluginsdk.S
 
 				"computer_name_prefix": computerPrefixWindowsSchema(),
 
-				// I am only commenting this out as this is going to be supported in the next release of the API in October 2021
-				// "additional_unattend_content": additionalUnattendContentSchema(),
+				"additional_unattend_content": additionalUnattendContentSchema(),
 
 				// TODO 4.0: change this from enable_* to *_enabled
 				"enable_automatic_updates": {

internal/services/compute/orchestrated_virtual_machine_scale_set_resource.go

@@ -419,6 +419,12 @@ func resourceOrchestratedVirtualMachineScaleSetCreate(d *pluginsdk.ResourceData,
 			provisionVMAgent := winConfig["provision_vm_agent"].(bool)
 			patchAssessmentMode := winConfig["patch_assessment_mode"].(string)
 			vmssOsProfile = expandOrchestratedVirtualMachineScaleSetOsProfileWithWindowsConfiguration(winConfig, customData)
+			additionalUnattendContentRaw := winConfig["additional_unattend_content"].([]interface{})
+			additionalUnattendContent := expandAdditionalUnattendContent(additionalUnattendContentRaw)
+
+			if len(additionalUnattendContentRaw) > 0 {
+				vmssOsProfile.WindowsConfiguration.AdditionalUnattendContent = additionalUnattendContent
+			}
 
 			// if the Computer Prefix Name was not defined use the computer name
 			if vmssOsProfile.ComputerNamePrefix == nil || len(*vmssOsProfile.ComputerNamePrefix) == 0 {
@@ -1301,6 +1307,12 @@ func resourceOrchestratedVirtualMachineScaleSetRead(d *pluginsdk.ResourceData, m
 		}
 		d.Set("encryption_at_host_enabled", encryptionAtHostEnabled)
 		d.Set("user_data_base64", profile.UserData)
+
+		if windows := profile.OsProfile.WindowsConfiguration; windows != nil {
+			if err := d.Set("additional_unattend_content", flattenAdditionalUnattendContent(windows.AdditionalUnattendContent, d)); err != nil {
+				return fmt.Errorf("setting `additional_unattend_content`: %+v", err)
+			}
+		}
 	}
 
 	if priorityMixPolicy := props.PriorityMixPolicy; priorityMixPolicy != nil {

internal/services/compute/orchestrated_virtual_machine_scale_set_resource_test.go

@@ -191,6 +191,7 @@ func TestAccOrchestratedVirtualMachineScaleSet_basicWindows(t *testing.T) {
 			Config: r.basicWindows(data),
 			Check: acceptance.ComposeTestCheckFunc(
 				check.That(data.ResourceName).ExistsInAzure(r),
+				check.That(data.ResourceName).Key("os_profile.0.windows_configuration.0.additional_unattend_content.0.setting").HasValue("AutoLogon"),
 			),
 		},
 	})
@@ -1000,6 +1001,11 @@ resource "azurerm_orchestrated_virtual_machine_scale_set" "test" {
       winrm_listener {
         protocol = "Http"
       }
+
+      additional_unattend_content {
+        content = "<UserAccounts><AdministratorPassword><Value>Jasdfds164</Value><PlainText>true</PlainText></AdministratorPassword></UserAccounts>"
+        setting = "AutoLogon"
+      }
     }
   }
 

website/docs/r/orchestrated_virtual_machine_scale_set.html.markdown

@@ -171,6 +171,8 @@ A `windows_configuration` block supports the following:
 
 * `winrm_listener` - (Optional) One or more `winrm_listener` blocks as defined below. Changing this forces a new resource to be created.
 
+* `additional_unattend_content` - (Optional) One or more `additional_unattend_content` blocks as defined below. Changing this forces a new resource to be created.
+
 ---
 
 A `linux_configuration` block supports the following:
@@ -211,6 +213,14 @@ A `secret` block supports the following:
 
 ---
 
+An `additional_unattend_content` block supports the following:
+
+* `content` - (Required) The XML formatted content that is added to the unattend.xml file for the specified path and component. Changing this forces a new resource to be created.
+
+* `setting` - (Required) The name of the setting to which the content applies. Possible values are `AutoLogon` and `FirstLogonCommands`. Changing this forces a new resource to be created.
+
+---
+
 A (Windows) `certificate` block supports the following:
 
 * `store` - (Required) The certificate store on the Virtual Machine where the certificate should be added.