bugfix(serverbackup): state drift in volume-id because of changed order (#979)

* fix: state drift in backup-properties.volume-id because of changed order in API response

---------

Signed-off-by: Mauritz Uphoff <mauritz.uphoff@stackit.cloud>
Co-authored-by: Marcel Jacek <Marcel.Jacek@stackit.cloud>

stackit/internal/services/serverbackup/schedule/resource.go

@@ -7,6 +7,8 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/hashicorp/terraform-plugin-framework-validators/listvalidator"
+	"github.com/hashicorp/terraform-plugin-framework/diag"
 	serverbackupUtils "github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/serverbackup/utils"
 
 	"github.com/hashicorp/terraform-plugin-framework-validators/int64validator"
@@ -206,6 +208,9 @@ func (r *scheduleResource) Schema(_ context.Context, _ resource.SchemaRequest, r
 					"volume_ids": schema.ListAttribute{
 						ElementType: types.StringType,
 						Optional:    true,
+						Validators: []validator.List{
+							listvalidator.SizeAtLeast(1),
+						},
 					},
 					"name": schema.StringAttribute{
 						Required: true,
@@ -455,14 +460,31 @@ func mapFields(ctx context.Context, schedule *serverbackup.BackupSchedule, model
 		model.BackupProperties = nil
 		return nil
 	}
-	ids, diags := types.ListValueFrom(ctx, types.StringType, schedule.BackupProperties.VolumeIds)
+
-	if diags.HasError() {
+	volIds := types.ListNull(types.StringType)
-		return fmt.Errorf("failed to map hosts: %w", core.DiagsToError(diags))
+	if schedule.BackupProperties.VolumeIds != nil {
+		var modelVolIds []string
+		if model.BackupProperties != nil {
+			var err error
+			modelVolIds, err = utils.ListValuetoStringSlice(model.BackupProperties.VolumeIds)
+			if err != nil {
+				return err
+			}
+		}
+
+		respVolIds := *schedule.BackupProperties.VolumeIds
+		reconciledVolIds := utils.ReconcileStringSlices(modelVolIds, respVolIds)
+
+		var diags diag.Diagnostics
+		volIds, diags = types.ListValueFrom(ctx, types.StringType, reconciledVolIds)
+		if diags.HasError() {
+			return fmt.Errorf("failed to map volumeIds: %w", core.DiagsToError(diags))
+		}
 	}
 	model.BackupProperties = &scheduleBackupPropertiesModel{
 		BackupName:      types.StringValue(*schedule.BackupProperties.Name),
 		RetentionPeriod: types.Int64Value(*schedule.BackupProperties.RetentionPeriod),
-		VolumeIds:       ids,
+		VolumeIds:       volIds,
 	}
 	model.Region = types.StringValue(region)
 	return nil

stackit/internal/services/serverbackup/serverbackup_acc_test.go

@@ -88,7 +88,7 @@ func TestAccServerBackupScheduleMinResource(t *testing.T) {
 			},
 			// Creation
 			{
-				Config:          resourceMinConfig,
+				Config:          testutil.ServerBackupProviderConfig() + "\n" + resourceMinConfig,
 				ConfigVariables: testConfigVarsMin,
 				Check: resource.ComposeAggregateTestCheckFunc(
 					// Backup schedule data
@@ -180,7 +180,7 @@ func TestAccServerBackupScheduleMaxResource(t *testing.T) {
 			},
 			// Creation
 			{
-				Config:          resourceMaxConfig,
+				Config:          testutil.ServerBackupProviderConfig() + "\n" + resourceMaxConfig,
 				ConfigVariables: testConfigVarsMax,
 				Check: resource.ComposeAggregateTestCheckFunc(
 					// Backup schedule data

stackit/internal/services/serverupdate/serverupdate_acc_test.go

@@ -90,7 +90,7 @@ func TestAccServerUpdateScheduleMinResource(t *testing.T) {
 			// Creation
 			{
 				ConfigVariables: testConfigVarsMin,
-				Config:          resourceMinConfig,
+				Config:          testutil.ServerUpdateProviderConfig() + "\n" + resourceMinConfig,
 				Check: resource.ComposeAggregateTestCheckFunc(
 					// Update schedule data
 					resource.TestCheckResourceAttr("stackit_server_update_schedule.test_schedule", "project_id", testutil.ConvertConfigVariable(testConfigVarsMin["project_id"])),
@@ -177,7 +177,7 @@ func TestAccServerUpdateScheduleMaxResource(t *testing.T) {
 			// Creation
 			{
 				ConfigVariables: testConfigVarsMax,
-				Config:          resourceMaxConfig,
+				Config:          testutil.ServerUpdateProviderConfig() + "\n" + resourceMaxConfig,
 				Check: resource.ComposeAggregateTestCheckFunc(
 					// Update schedule data
 					resource.TestCheckResourceAttr("stackit_server_update_schedule.test_schedule", "project_id", testutil.ConvertConfigVariable(testConfigVarsMax["project_id"])),

stackit/internal/testutil/testutil.go

@@ -379,11 +379,13 @@ func ServerBackupProviderConfig() string {
 		return `
 		provider "stackit" {
 			default_region = "eu01"
+			enable_beta_resources = true
 		}`
 	}
 	return fmt.Sprintf(`
 		provider "stackit" {
 			server_backup_custom_endpoint = "%s"
+			enable_beta_resources = true
 		}`,
 		ServerBackupCustomEndpoint,
 	)