Add templateOverride field to override the default workflowTemplate

api/v1beta1/tinkerbellmachine_types.go

@@ -60,6 +60,11 @@ type TinkerbellMachineSpec struct {
 	// +optional
 	ImageLookupOSVersion string `json:"imageLookupOSVersion,omitempty"`
 
+	// TemplateOverride overrides the default Tinkerbell template used by CAPT.
+	// You can learn more about Tinkerbell templates here: https://docs.tinkerbell.org/templates/
+	// +optional
+	TemplateOverride string `json:"templateOverride,omitempty"`
+
 	// Those fields are set programmatically, but they cannot be re-constructed from "state of the world", so
 	// we put them in spec instead of status.
 	HardwareName string `json:"hardwareName,omitempty"`

config/crd/bases/infrastructure.cluster.x-k8s.io_tinkerbellmachines.yaml

@@ -97,6 +97,11 @@ spec:
                 type: string
               providerID:
                 type: string
+              templateOverride:
+                description: 'TemplateOverride overrides the default Tinkerbell template
+                  used by CAPT. You can learn more about Tinkerbell templates here:
+                  https://docs.tinkerbell.org/templates/'
+                type: string
             type: object
           status:
             description: TinkerbellMachineStatus defines the observed state of TinkerbellMachine.

config/crd/bases/infrastructure.cluster.x-k8s.io_tinkerbellmachinetemplates.yaml

@@ -88,6 +88,11 @@ spec:
                         type: string
                       providerID:
                         type: string
+                      templateOverride:
+                        description: 'TemplateOverride overrides the default Tinkerbell
+                          template used by CAPT. You can learn more about Tinkerbell
+                          templates here: https://docs.tinkerbell.org/templates/'
+                        type: string
                     type: object
                 required:
                 - spec

controllers/machine.go

@@ -173,32 +173,35 @@ func (mrc *machineReconcileContext) createTemplate(hardware *tinkv1.Hardware) er
 		return ErrHardwareMissingDiskConfiguration
 	}
 
-	targetDisk := hardware.Status.Disks[0].Device
-	targetDevice := firstPartitionFromDevice(targetDisk)
+	templateData := mrc.tinkerbellMachine.Spec.TemplateOverride
+	if templateData == "" {
+		targetDisk := hardware.Status.Disks[0].Device
+		targetDevice := firstPartitionFromDevice(targetDisk)
 
-	imageURL, err := mrc.imageURL()
-	if err != nil {
-		return fmt.Errorf("failed to generate imageURL: %w", err)
-	}
+		imageURL, err := mrc.imageURL()
+		if err != nil {
+			return fmt.Errorf("failed to generate imageURL: %w", err)
+		}
 
-	metadataIP := os.Getenv("TINKERBELL_IP")
-	if metadataIP == "" {
-		metadataIP = "192.168.1.1"
-	}
+		metadataIP := os.Getenv("TINKERBELL_IP")
+		if metadataIP == "" {
+			metadataIP = "192.168.1.1"
+		}
 
-	metadataURL := fmt.Sprintf("http://%s:50061", metadataIP)
+		metadataURL := fmt.Sprintf("http://%s:50061", metadataIP)
 
-	workflowTemplate := templates.WorkflowTemplate{
-		Name:          mrc.tinkerbellMachine.Name,
-		MetadataURL:   metadataURL,
-		ImageURL:      imageURL,
-		DestDisk:      targetDisk,
-		DestPartition: targetDevice,
-	}
+		workflowTemplate := templates.WorkflowTemplate{
+			Name:          mrc.tinkerbellMachine.Name,
+			MetadataURL:   metadataURL,
+			ImageURL:      imageURL,
+			DestDisk:      targetDisk,
+			DestPartition: targetDevice,
+		}
 
-	templateData, err := workflowTemplate.Render()
-	if err != nil {
-		return fmt.Errorf("rendering template: %w", err)
+		templateData, err = workflowTemplate.Render()
+		if err != nil {
+			return fmt.Errorf("rendering template: %w", err)
+		}
 	}
 
 	templateObject := &tinkv1.Template{