build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/k8s.io/kubernetes/pkg/util/taints/taints.go

@@ -0,0 +1,289 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// package taints implements utilities for working with taints
+package taints
+
+import (
+	"fmt"
+	"strings"
+
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/apimachinery/pkg/util/validation"
+	"k8s.io/kubernetes/pkg/apis/core/helper"
+)
+
+const (
+	MODIFIED  = "modified"
+	TAINTED   = "tainted"
+	UNTAINTED = "untainted"
+)
+
+// parseTaint parses a taint from a string, whose form must be either
+// '<key>=<value>:<effect>', '<key>:<effect>', or '<key>'.
+func parseTaint(st string) (v1.Taint, error) {
+	var taint v1.Taint
+
+	var key string
+	var value string
+	var effect v1.TaintEffect
+
+	parts := strings.Split(st, ":")
+	switch len(parts) {
+	case 1:
+		key = parts[0]
+	case 2:
+		effect = v1.TaintEffect(parts[1])
+		if err := validateTaintEffect(effect); err != nil {
+			return taint, err
+		}
+
+		partsKV := strings.Split(parts[0], "=")
+		if len(partsKV) > 2 {
+			return taint, fmt.Errorf("invalid taint spec: %v", st)
+		}
+		key = partsKV[0]
+		if len(partsKV) == 2 {
+			value = partsKV[1]
+			if errs := validation.IsValidLabelValue(value); len(errs) > 0 {
+				return taint, fmt.Errorf("invalid taint spec: %v, %s", st, strings.Join(errs, "; "))
+			}
+		}
+	default:
+		return taint, fmt.Errorf("invalid taint spec: %v", st)
+	}
+
+	if errs := validation.IsQualifiedName(key); len(errs) > 0 {
+		return taint, fmt.Errorf("invalid taint spec: %v, %s", st, strings.Join(errs, "; "))
+	}
+
+	taint.Key = key
+	taint.Value = value
+	taint.Effect = effect
+
+	return taint, nil
+}
+
+func validateTaintEffect(effect v1.TaintEffect) error {
+	if effect != v1.TaintEffectNoSchedule && effect != v1.TaintEffectPreferNoSchedule && effect != v1.TaintEffectNoExecute {
+		return fmt.Errorf("invalid taint effect: %v, unsupported taint effect", effect)
+	}
+
+	return nil
+}
+
+// ParseTaints takes a spec which is an array and creates slices for new taints to be added, taints to be deleted.
+// It also validates the spec. For example, the form `<key>` may be used to remove a taint, but not to add one.
+func ParseTaints(spec []string) ([]v1.Taint, []v1.Taint, error) {
+	var taints, taintsToRemove []v1.Taint
+	uniqueTaints := map[v1.TaintEffect]sets.String{}
+
+	for _, taintSpec := range spec {
+		if strings.HasSuffix(taintSpec, "-") {
+			taintToRemove, err := parseTaint(strings.TrimSuffix(taintSpec, "-"))
+			if err != nil {
+				return nil, nil, err
+			}
+			taintsToRemove = append(taintsToRemove, v1.Taint{Key: taintToRemove.Key, Effect: taintToRemove.Effect})
+		} else {
+			newTaint, err := parseTaint(taintSpec)
+			if err != nil {
+				return nil, nil, err
+			}
+			// validate that the taint has an effect, which is required to add the taint
+			if len(newTaint.Effect) == 0 {
+				return nil, nil, fmt.Errorf("invalid taint spec: %v", taintSpec)
+			}
+			// validate if taint is unique by <key, effect>
+			if len(uniqueTaints[newTaint.Effect]) > 0 && uniqueTaints[newTaint.Effect].Has(newTaint.Key) {
+				return nil, nil, fmt.Errorf("duplicated taints with the same key and effect: %v", newTaint)
+			}
+			// add taint to existingTaints for uniqueness check
+			if len(uniqueTaints[newTaint.Effect]) == 0 {
+				uniqueTaints[newTaint.Effect] = sets.String{}
+			}
+			uniqueTaints[newTaint.Effect].Insert(newTaint.Key)
+
+			taints = append(taints, newTaint)
+		}
+	}
+	return taints, taintsToRemove, nil
+}
+
+// CheckIfTaintsAlreadyExists checks if the node already has taints that we want to add and returns a string with taint keys.
+func CheckIfTaintsAlreadyExists(oldTaints []v1.Taint, taints []v1.Taint) string {
+	var existingTaintList = make([]string, 0)
+	for _, taint := range taints {
+		for _, oldTaint := range oldTaints {
+			if taint.Key == oldTaint.Key && taint.Effect == oldTaint.Effect {
+				existingTaintList = append(existingTaintList, taint.Key)
+			}
+		}
+	}
+	return strings.Join(existingTaintList, ",")
+}
+
+// DeleteTaintsByKey removes all the taints that have the same key to given taintKey
+func DeleteTaintsByKey(taints []v1.Taint, taintKey string) ([]v1.Taint, bool) {
+	newTaints := []v1.Taint{}
+	deleted := false
+	for i := range taints {
+		if taintKey == taints[i].Key {
+			deleted = true
+			continue
+		}
+		newTaints = append(newTaints, taints[i])
+	}
+	return newTaints, deleted
+}
+
+// DeleteTaint removes all the taints that have the same key and effect to given taintToDelete.
+func DeleteTaint(taints []v1.Taint, taintToDelete *v1.Taint) ([]v1.Taint, bool) {
+	newTaints := []v1.Taint{}
+	deleted := false
+	for i := range taints {
+		if taintToDelete.MatchTaint(&taints[i]) {
+			deleted = true
+			continue
+		}
+		newTaints = append(newTaints, taints[i])
+	}
+	return newTaints, deleted
+}
+
+// RemoveTaint tries to remove a taint from annotations list. Returns a new copy of updated Node and true if something was updated
+// false otherwise.
+func RemoveTaint(node *v1.Node, taint *v1.Taint) (*v1.Node, bool, error) {
+	newNode := node.DeepCopy()
+	nodeTaints := newNode.Spec.Taints
+	if len(nodeTaints) == 0 {
+		return newNode, false, nil
+	}
+
+	if !TaintExists(nodeTaints, taint) {
+		return newNode, false, nil
+	}
+
+	newTaints, _ := DeleteTaint(nodeTaints, taint)
+	newNode.Spec.Taints = newTaints
+	return newNode, true, nil
+}
+
+// AddOrUpdateTaint tries to add a taint to annotations list. Returns a new copy of updated Node and true if something was updated
+// false otherwise.
+func AddOrUpdateTaint(node *v1.Node, taint *v1.Taint) (*v1.Node, bool, error) {
+	newNode := node.DeepCopy()
+	nodeTaints := newNode.Spec.Taints
+
+	var newTaints []v1.Taint
+	updated := false
+	for i := range nodeTaints {
+		if taint.MatchTaint(&nodeTaints[i]) {
+			if helper.Semantic.DeepEqual(*taint, nodeTaints[i]) {
+				return newNode, false, nil
+			}
+			newTaints = append(newTaints, *taint)
+			updated = true
+			continue
+		}
+
+		newTaints = append(newTaints, nodeTaints[i])
+	}
+
+	if !updated {
+		newTaints = append(newTaints, *taint)
+	}
+
+	newNode.Spec.Taints = newTaints
+	return newNode, true, nil
+}
+
+// TaintExists checks if the given taint exists in list of taints. Returns true if exists false otherwise.
+func TaintExists(taints []v1.Taint, taintToFind *v1.Taint) bool {
+	for _, taint := range taints {
+		if taint.MatchTaint(taintToFind) {
+			return true
+		}
+	}
+	return false
+}
+
+// TaintKeyExists checks if the given taint key exists in list of taints. Returns true if exists false otherwise.
+func TaintKeyExists(taints []v1.Taint, taintKeyToMatch string) bool {
+	for _, taint := range taints {
+		if taint.Key == taintKeyToMatch {
+			return true
+		}
+	}
+	return false
+}
+
+// TaintSetDiff finds the difference between two taint slices and
+// returns all new and removed elements of the new slice relative to the old slice.
+// for example:
+// input: taintsNew=[a b] taintsOld=[a c]
+// output: taintsToAdd=[b] taintsToRemove=[c]
+func TaintSetDiff(taintsNew, taintsOld []v1.Taint) (taintsToAdd []*v1.Taint, taintsToRemove []*v1.Taint) {
+	for _, taint := range taintsNew {
+		if !TaintExists(taintsOld, &taint) {
+			t := taint
+			taintsToAdd = append(taintsToAdd, &t)
+		}
+	}
+
+	for _, taint := range taintsOld {
+		if !TaintExists(taintsNew, &taint) {
+			t := taint
+			taintsToRemove = append(taintsToRemove, &t)
+		}
+	}
+
+	return
+}
+
+// TaintSetFilter filters from the taint slice according to the passed fn function to get the filtered taint slice.
+func TaintSetFilter(taints []v1.Taint, fn func(*v1.Taint) bool) []v1.Taint {
+	res := []v1.Taint{}
+
+	for _, taint := range taints {
+		if fn(&taint) {
+			res = append(res, taint)
+		}
+	}
+
+	return res
+}
+
+// CheckTaintValidation checks if the given taint is valid.
+// Returns error if the given taint is invalid.
+func CheckTaintValidation(taint v1.Taint) error {
+	if errs := validation.IsQualifiedName(taint.Key); len(errs) > 0 {
+		return fmt.Errorf("invalid taint key: %s", strings.Join(errs, "; "))
+	}
+	if taint.Value != "" {
+		if errs := validation.IsValidLabelValue(taint.Value); len(errs) > 0 {
+			return fmt.Errorf("invalid taint value: %s", strings.Join(errs, "; "))
+		}
+	}
+	if taint.Effect != "" {
+		if err := validateTaintEffect(taint.Effect); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}