kubectl: drop dependency on github.com/pkg/errors

The package is unmaintained, and kubectl doesn't rely on the
functionality it provides on top of Golang errors (stack traces).

Signed-off-by: Stephen Kitt <skitt@redhat.com>

hack/unwanted-dependencies.json

@@ -227,7 +227,6 @@
       "github.com/pkg/errors": [
         "github.com/Microsoft/hnslib",
         "github.com/google/cadvisor",
-        "k8s.io/kubectl",
         "k8s.io/kubernetes",
         "sigs.k8s.io/kustomize/api",
         "sigs.k8s.io/kustomize/kustomize/v5"

staging/src/k8s.io/kubectl/go.mod

@@ -22,7 +22,6 @@ require (
 	github.com/moby/term v0.5.0
 	github.com/onsi/ginkgo/v2 v2.21.0
 	github.com/onsi/gomega v1.35.1
-	github.com/pkg/errors v0.9.1
 	github.com/russross/blackfriday/v2 v2.1.0
 	github.com/spf13/cobra v1.8.1
 	github.com/spf13/pflag v1.0.6
@@ -76,6 +75,7 @@ require (
 	github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	github.com/xlab/treeprint v1.2.0 // indirect

staging/src/k8s.io/kubectl/pkg/cmd/apply/patcher.go

@@ -23,8 +23,6 @@ import (
 	"io"
 	"time"
 
-	"github.com/pkg/errors"
-
 	"github.com/jonboulle/clockwork"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/api/meta"
@@ -61,7 +59,7 @@ const (
 // patchRetryBackOffPeriod is the period to back off when apply patch results in error.
 var patchRetryBackOffPeriod = 1 * time.Second
 
-var createPatchErrFormat = "creating patch with:\noriginal:\n%s\nmodified:\n%s\ncurrent:\n%s\nfor:"
+var createPatchErrFormat = "creating patch with:\noriginal:\n%s\nmodified:\n%s\ncurrent:\n%s\nfor: %w"
 
 // Patcher defines options to patch OpenAPI objects.
 type Patcher struct {
@@ -120,13 +118,13 @@ func (p *Patcher) patchSimple(obj runtime.Object, modified []byte, namespace, na
 	// Serialize the current configuration of the object from the server.
 	current, err := runtime.Encode(unstructured.UnstructuredJSONScheme, obj)
 	if err != nil {
-		return nil, nil, errors.Wrapf(err, "serializing current configuration from:\n%v\nfor:", obj)
+		return nil, nil, fmt.Errorf("serializing current configuration from:\n%v\nfor: %w", obj, err)
 	}
 
 	// Retrieve the original configuration of the object from the annotation.
 	original, err := util.GetOriginalConfiguration(obj)
 	if err != nil {
-		return nil, nil, errors.Wrapf(err, "retrieving original configuration from:\n%v\nfor:", obj)
+		return nil, nil, fmt.Errorf("retrieving original configuration from:\n%v\nfor: %w", obj, err)
 	}
 
 	var patchType types.PatchType
@@ -178,17 +176,17 @@ func (p *Patcher) patchSimple(obj runtime.Object, modified []byte, namespace, na
 			patchType = types.StrategicMergePatchType
 			patch, err = p.buildStrategicMergeFromBuiltins(versionedObj, original, modified, current)
 			if err != nil {
-				return nil, nil, errors.Wrapf(err, createPatchErrFormat, original, modified, current)
+				return nil, nil, fmt.Errorf(createPatchErrFormat, original, modified, current, err)
 			}
 		} else {
 			if !runtime.IsNotRegisteredError(err) {
-				return nil, nil, errors.Wrapf(err, "getting instance of versioned object for %v:", p.Mapping.GroupVersionKind)
+				return nil, nil, fmt.Errorf("getting instance of versioned object for %v: %w", p.Mapping.GroupVersionKind, err)
 			}
 
 			patchType = types.MergePatchType
 			patch, err = p.buildMergePatch(original, modified, current)
 			if err != nil {
-				return nil, nil, errors.Wrapf(err, createPatchErrFormat, original, modified, current)
+				return nil, nil, fmt.Errorf(createPatchErrFormat, original, modified, current, err)
 			}
 		}
 	}
@@ -200,7 +198,7 @@ func (p *Patcher) patchSimple(obj runtime.Object, modified []byte, namespace, na
 	if p.ResourceVersion != nil {
 		patch, err = addResourceVersion(patch, *p.ResourceVersion)
 		if err != nil {
-			return nil, nil, errors.Wrap(err, "Failed to insert resourceVersion in patch")
+			return nil, nil, fmt.Errorf("failed to insert resourceVersion in patch: %w", err)
 		}
 	}
 

staging/src/k8s.io/kubectl/pkg/cmd/patch/patch.go

@@ -22,7 +22,6 @@ import (
 	"reflect"
 	"strings"
 
-	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	jsonpatch "gopkg.in/evanphx/json-patch.v4"
 	"k8s.io/klog/v2"
@@ -260,7 +259,7 @@ func (o *PatchOptions) RunPatch() error {
 			patchedObj, err := helper.Patch(namespace, name, patchType, patchBytes, nil)
 			if err != nil {
 				if apierrors.IsUnsupportedMediaType(err) {
-					return errors.Wrap(err, fmt.Sprintf("%s is not supported by %s", patchType, mapping.GroupVersionKind))
+					return fmt.Errorf("%s is not supported by %s: %w", patchType, mapping.GroupVersionKind, err)
 				}
 				return err
 			}