forked from kubernetes/kubectl
/
prune.go
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/
prune.go
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/*
Copyright 2019 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 apply
import (
"context"
"fmt"
"io"
"strings"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/cli-runtime/pkg/printers"
"k8s.io/client-go/dynamic"
cmdutil "k8s.io/kubectl/pkg/cmd/util"
)
type pruner struct {
mapper meta.RESTMapper
dynamicClient dynamic.Interface
visitedUids sets.String
visitedNamespaces sets.String
labelSelector string
fieldSelector string
cascadingStrategy metav1.DeletionPropagation
dryRunStrategy cmdutil.DryRunStrategy
gracePeriod int
toPrinter func(string) (printers.ResourcePrinter, error)
out io.Writer
}
func newPruner(o *ApplyOptions) pruner {
return pruner{
mapper: o.Mapper,
dynamicClient: o.DynamicClient,
labelSelector: o.Selector,
visitedUids: o.VisitedUids,
visitedNamespaces: o.VisitedNamespaces,
cascadingStrategy: o.DeleteOptions.CascadingStrategy,
dryRunStrategy: o.DryRunStrategy,
gracePeriod: o.DeleteOptions.GracePeriod,
toPrinter: o.ToPrinter,
out: o.Out,
}
}
func (p *pruner) pruneAll(o *ApplyOptions) error {
namespacedRESTMappings, nonNamespacedRESTMappings, err := getRESTMappings(o.Mapper, &(o.PruneResources))
if err != nil {
return fmt.Errorf("error retrieving RESTMappings to prune: %v", err)
}
for n := range p.visitedNamespaces {
for _, m := range namespacedRESTMappings {
if err := p.prune(n, m); err != nil {
return fmt.Errorf("error pruning namespaced object %v: %v", m.GroupVersionKind, err)
}
}
}
for _, m := range nonNamespacedRESTMappings {
if err := p.prune(metav1.NamespaceNone, m); err != nil {
return fmt.Errorf("error pruning nonNamespaced object %v: %v", m.GroupVersionKind, err)
}
}
return nil
}
func (p *pruner) prune(namespace string, mapping *meta.RESTMapping) error {
objList, err := p.dynamicClient.Resource(mapping.Resource).
Namespace(namespace).
List(context.TODO(), metav1.ListOptions{
LabelSelector: p.labelSelector,
FieldSelector: p.fieldSelector,
})
if err != nil {
return err
}
objs, err := meta.ExtractList(objList)
if err != nil {
return err
}
for _, obj := range objs {
metadata, err := meta.Accessor(obj)
if err != nil {
return err
}
annots := metadata.GetAnnotations()
if _, ok := annots[corev1.LastAppliedConfigAnnotation]; !ok {
// don't prune resources not created with apply
continue
}
uid := metadata.GetUID()
if p.visitedUids.Has(string(uid)) {
continue
}
name := metadata.GetName()
if p.dryRunStrategy != cmdutil.DryRunClient {
if err := p.delete(namespace, name, mapping); err != nil {
return err
}
}
printer, err := p.toPrinter("pruned")
if err != nil {
return err
}
printer.PrintObj(obj, p.out)
}
return nil
}
func (p *pruner) delete(namespace, name string, mapping *meta.RESTMapping) error {
return runDelete(namespace, name, mapping, p.dynamicClient, p.cascadingStrategy, p.gracePeriod, p.dryRunStrategy == cmdutil.DryRunServer)
}
func runDelete(namespace, name string, mapping *meta.RESTMapping, c dynamic.Interface, cascadingStrategy metav1.DeletionPropagation, gracePeriod int, serverDryRun bool) error {
options := asDeleteOptions(cascadingStrategy, gracePeriod)
if serverDryRun {
options.DryRun = []string{metav1.DryRunAll}
}
return c.Resource(mapping.Resource).Namespace(namespace).Delete(context.TODO(), name, options)
}
func asDeleteOptions(cascadingStrategy metav1.DeletionPropagation, gracePeriod int) metav1.DeleteOptions {
options := metav1.DeleteOptions{}
if gracePeriod >= 0 {
options = *metav1.NewDeleteOptions(int64(gracePeriod))
}
options.PropagationPolicy = &cascadingStrategy
return options
}
type pruneResource struct {
group string
version string
kind string
namespaced bool
}
func (pr pruneResource) String() string {
return fmt.Sprintf("%v/%v, Kind=%v, Namespaced=%v", pr.group, pr.version, pr.kind, pr.namespaced)
}
func getRESTMappings(mapper meta.RESTMapper, pruneResources *[]pruneResource) (namespaced, nonNamespaced []*meta.RESTMapping, err error) {
if len(*pruneResources) == 0 {
// default allowlist
*pruneResources = []pruneResource{
{"", "v1", "ConfigMap", true},
{"", "v1", "Endpoints", true},
{"", "v1", "Namespace", false},
{"", "v1", "PersistentVolumeClaim", true},
{"", "v1", "PersistentVolume", false},
{"", "v1", "Pod", true},
{"", "v1", "ReplicationController", true},
{"", "v1", "Secret", true},
{"", "v1", "Service", true},
{"batch", "v1", "Job", true},
{"batch", "v1", "CronJob", true},
{"networking.k8s.io", "v1", "Ingress", true},
{"apps", "v1", "DaemonSet", true},
{"apps", "v1", "Deployment", true},
{"apps", "v1", "ReplicaSet", true},
{"apps", "v1", "StatefulSet", true},
}
}
for _, resource := range *pruneResources {
addedMapping, err := mapper.RESTMapping(schema.GroupKind{Group: resource.group, Kind: resource.kind}, resource.version)
if err != nil {
return nil, nil, fmt.Errorf("invalid resource %v: %v", resource, err)
}
if resource.namespaced {
namespaced = append(namespaced, addedMapping)
} else {
nonNamespaced = append(nonNamespaced, addedMapping)
}
}
return namespaced, nonNamespaced, nil
}
func parsePruneResources(mapper meta.RESTMapper, gvks []string) ([]pruneResource, error) {
pruneResources := []pruneResource{}
for _, groupVersionKind := range gvks {
gvk := strings.Split(groupVersionKind, "/")
if len(gvk) != 3 {
return nil, fmt.Errorf("invalid GroupVersionKind format: %v, please follow <group/version/kind>", groupVersionKind)
}
if gvk[0] == "core" {
gvk[0] = ""
}
mapping, err := mapper.RESTMapping(schema.GroupKind{Group: gvk[0], Kind: gvk[2]}, gvk[1])
if err != nil {
return pruneResources, err
}
var namespaced bool
namespaceScope := mapping.Scope.Name()
switch namespaceScope {
case meta.RESTScopeNameNamespace:
namespaced = true
case meta.RESTScopeNameRoot:
namespaced = false
default:
return pruneResources, fmt.Errorf("Unknown namespace scope: %q", namespaceScope)
}
pruneResources = append(pruneResources, pruneResource{gvk[0], gvk[1], gvk[2], namespaced})
}
return pruneResources, nil
}