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taint.go
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taint.go
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/*
Copyright 2018 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.
*/
// This code is directly lifted from the Kubernetes codebase.
// For reference:
// https://github.com/kubernetes/kubernetes/blob/release-1.26/staging/src/k8s.io/kubectl/pkg/cmd/taint/utils.go#L37-L126
package lifted
import (
"fmt"
"strings"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/validation"
)
// +lifted:source=https://github.com/kubernetes/kubernetes/blob/release-1.26/staging/src/k8s.io/kubectl/pkg/cmd/taint/utils.go#L37-L73
// +lifted:changed
// 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) ([]corev1.Taint, []corev1.Taint, error) {
var taints, taintsToRemove []corev1.Taint
//nolint:staticcheck
// disable `deprecation` check for lifted code.
uniqueTaints := map[corev1.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, corev1.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 {
//nolint:staticcheck
// disable `deprecation` check for lifted code.
uniqueTaints[newTaint.Effect] = sets.String{}
}
uniqueTaints[newTaint.Effect].Insert(newTaint.Key)
taints = append(taints, newTaint)
}
}
return taints, taintsToRemove, nil
}
// +lifted:source=https://github.com/kubernetes/kubernetes/blob/release-1.26/staging/src/k8s.io/kubectl/pkg/cmd/taint/utils.go#L75-L118
// parseTaint parses a taint from a string, whose form must be either
// '<key>=<value>:<effect>', '<key>:<effect>', or '<key>'.
func parseTaint(st string) (corev1.Taint, error) {
var taint corev1.Taint
var key string
var value string
var effect corev1.TaintEffect
parts := strings.Split(st, ":")
switch len(parts) {
case 1:
key = parts[0]
case 2:
effect = corev1.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
}
// +lifted:source=https://github.com/kubernetes/kubernetes/blob/release-1.26/staging/src/k8s.io/kubectl/pkg/cmd/taint/utils.go#L120-L126
func validateTaintEffect(effect corev1.TaintEffect) error {
if effect != corev1.TaintEffectNoSchedule && effect != corev1.TaintEffectPreferNoSchedule && effect != corev1.TaintEffectNoExecute {
return fmt.Errorf("invalid taint effect: %v, unsupported taint effect", effect)
}
return nil
}