Support additional_unattend_content part of azurerm_orchestrated_virtual_machine_scale_set resource

internal/services/compute/orchestrated_virtual_machine_scale_set_resource.go

@@ -266,6 +266,8 @@ func resourceOrchestratedVirtualMachineScaleSet() *pluginsdk.Resource {
 			},
 
 			"priority_mix": OrchestratedVirtualMachineScaleSetPriorityMixPolicySchema(),
+
+			"additional_unattend_content": additionalUnattendContentSchema(),
 		},
 	}
 }
@@ -403,6 +405,9 @@ func resourceOrchestratedVirtualMachineScaleSetCreate(d *pluginsdk.ResourceData,
 	extensionOperationsEnabled := d.Get("extension_operations_enabled").(bool)
 	osProfileRaw := d.Get("os_profile").([]interface{})
 
+	additionalUnattendContentRaw := d.Get("additional_unattend_content").([]interface{})
+	additionalUnattendContent := expandAdditionalUnattendContent(additionalUnattendContentRaw)
+
 	if len(osProfileRaw) > 0 {
 		osProfile := osProfileRaw[0].(map[string]interface{})
 		winConfigRaw = osProfile["windows_configuration"].([]interface{})
@@ -420,6 +425,10 @@ func resourceOrchestratedVirtualMachineScaleSetCreate(d *pluginsdk.ResourceData,
 			patchAssessmentMode := winConfig["patch_assessment_mode"].(string)
 			vmssOsProfile = expandOrchestratedVirtualMachineScaleSetOsProfileWithWindowsConfiguration(winConfig, customData)
 
+			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 {
 				// validate that the computer name is a valid Computer Prefix Name
@@ -1301,6 +1310,12 @@ 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("additional_unattend_content.0.setting").HasValue("AutoLogon"),
 			),
 		},
 	})
@@ -987,6 +988,11 @@ resource "azurerm_orchestrated_virtual_machine_scale_set" "test" {
 
   platform_fault_domain_count = 2
 
+  additional_unattend_content {
+    content = "<UserAccounts><AdministratorPassword><Value>Jasdfds164</Value><PlainText>true</PlainText></AdministratorPassword></UserAccounts>"
+    setting = "AutoLogon"
+  }
+
   os_profile {
     windows_configuration {
       computer_name_prefix = "testvm"

website/docs/r/orchestrated_virtual_machine_scale_set.html.markdown

@@ -51,6 +51,8 @@ resource "azurerm_orchestrated_virtual_machine_scale_set" "example" {
 
 * `additional_capabilities` - (Optional) An `additional_capabilities` block as defined below.
 
+* `additional_unattend_content` - (Optional) One or more `additional_unattend_content` blocks as defined below. Changing this forces a new resource to be created.
+
 * `encryption_at_host_enabled` - (Optional) Should disks attached to this Virtual Machine Scale Set be encrypted by enabling Encryption at Host?
 
 * `instances` - (Optional) The number of Virtual Machines in the Orcestrated Virtual Machine Scale Set.
@@ -129,6 +131,14 @@ An `additional_capabilities` 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.
+
+---
+
 An `os_profile` block supports the following:
 
 * `custom_data` - (Optional) The Base64-Encoded Custom Data which should be used for this Orchestrated Virtual Machine Scale Set.