Propagate inventory labels to node on bootstrap plan (#243)

Inventory labels are not propagated from the inventory into the node so
they are pretty useless for things like upgrades.

This patch fixes it by using the override yaml in the node k3s/rke2
configuration to append node labels obtained from the inventory

Signed-off-by: Itxaka <igarcia@suse.com>

Signed-off-by: Itxaka <igarcia@suse.com>

Author: Itxaka

pkg/controllers/machineinventoryselector/bootstrap.go

@@ -20,13 +20,15 @@ import (
 	"bytes"
 	"encoding/base64"
 	"encoding/json"
+	"fmt"
 
 	"github.com/pkg/errors"
 	"github.com/rancher/elemental-operator/pkg/apis/elemental.cattle.io/v1beta1"
 	"github.com/rancher/elemental-operator/pkg/controllers/machineinventory"
 	"github.com/rancher/system-agent/pkg/applyinator"
 	"github.com/rancher/wrangler/pkg/generic"
 	"github.com/sirupsen/logrus"
+	"sigs.k8s.io/yaml"
 )
 
 // bootstrapReadyHandler once the `InventoryReady` condition is true the bootstrap will set the bootstrap plan and record the checksum.  Once the bootstrap checksum is applied to the machine inventory bootstrap is considered complete.
@@ -145,6 +147,21 @@ func (h *handler) getBootstrapPlan(selector *v1beta1.MachineInventorySelector, i
 		return "", nil, err
 	}
 
+	type LabelsFromInventory struct {
+		NodeLabels []string `yaml:"node-label+"`
+	}
+
+	nodeLabelsFromInventory := LabelsFromInventory{NodeLabels: []string{}}
+	for label, value := range inventory.Labels {
+		nodeLabelsFromInventory.NodeLabels = append(nodeLabelsFromInventory.NodeLabels, fmt.Sprintf("%s=%s", label, value))
+	}
+
+	nodeLabelsFromInventoryInYaml, err := yaml.Marshal(nodeLabelsFromInventory)
+	if err != nil {
+		logrus.Warnf("Could not decode the inventory labels to add them to the node: %s", err)
+		nodeLabelsFromInventoryInYaml = []byte("")
+	}
+
 	p := applyinator.Plan{
 		Files: []applyinator.File{
 			{
@@ -157,11 +174,21 @@ func (h *handler) getBootstrapPlan(selector *v1beta1.MachineInventorySelector, i
 				Path:        "/etc/rancher/rke2/config.yaml.d/99-elemental-name.yaml",
 				Permissions: "0600",
 			},
+			{
+				Content:     base64.StdEncoding.EncodeToString(nodeLabelsFromInventoryInYaml),
+				Path:        "/etc/rancher/rke2/config.yaml.d/99-elemental-inventory-labels.yaml",
+				Permissions: "0600",
+			},
 			{
 				Content:     base64.StdEncoding.EncodeToString([]byte("node-name: " + inventory.Name)),
 				Path:        "/etc/rancher/k3s/config.yaml.d/99-elemental-name.yaml",
 				Permissions: "0600",
 			},
+			{
+				Content:     base64.StdEncoding.EncodeToString(nodeLabelsFromInventoryInYaml),
+				Path:        "/etc/rancher/k3s/config.yaml.d/99-elemental-inventory-labels.yaml",
+				Permissions: "0600",
+			},
 			{
 				Content:     base64.StdEncoding.EncodeToString([]byte(inventory.Name)),
 				Path:        "/usr/local/etc/hostname",