feat(controller): patch CRDs to upgrade them

Signed-off-by: Niladri Halder <niladri.halder26@gmail.com>

pkg/patcher/patcher.go

@@ -3,14 +3,14 @@ package patcher
 import (
 	"context"
 	"fmt"
-	"github.com/openebs/lib-csi/pkg/common/errors"
 	"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	k8stypes "k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/strategicpatch"
 	"k8s.io/client-go/dynamic"
 	"k8s.io/client-go/rest"
+	"os"
 )
 
 type Patchable struct {
@@ -20,13 +20,13 @@ type Patchable struct {
 func PatchCrdOrIgnore(gvr schema.GroupVersionResource, namespace string) *Patchable {
 	cfg, err := rest.InClusterConfig()
 	if err != nil {
-		errors.Errorf("failed to generate in-cluster config: %s", err.Error())
+		fmt.Fprintf(os.Stderr, "failed to generate in-cluster config: %s", err.Error())
 		return nil
 	}
 
 	client, err := dynamic.NewForConfig(cfg)
 	if err != nil {
-		errors.Errorf("failed to generate in-cluster kubernetes client: %s", err.Error())
+		fmt.Fprintf(os.Stderr, "failed to generate in-cluster kubernetes client", err.Error())
 		return nil
 	}
 
@@ -40,12 +40,12 @@ func (p *Patchable) WithMergePatchFrom(name string, original, modified []byte) {
 
 	patch, err := strategicpatch.CreateTwoWayMergePatch(original, modified, apiextensions.CustomResourceDefinition{})
 	if err != nil {
-		errors.Errorf("failed to create merge patch for %s: %s", name, err.Error())
+		fmt.Fprintf(os.Stderr, "failed to create merge patch for %s: %s", name, err.Error())
 		return
 	}
 	_, err = p.inner.Patch(context.TODO(), name, k8stypes.MergePatchType, patch, metav1.PatchOptions{})
 	if err != nil {
-		errors.Errorf("failed to patch resource %s: %s", name, err.Error())
+		fmt.Fprintf(os.Stderr, "failed to patch resource %s: %s", name, err.Error())
 		return
 	}