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replace.go
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replace.go
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/*
Copyright 2014 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 cmd
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"time"
"github.com/spf13/cobra"
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/cli-runtime/pkg/genericclioptions/resource"
"k8s.io/kubernetes/pkg/kubectl"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
"k8s.io/kubernetes/pkg/kubectl/validation"
)
var (
replaceLong = templates.LongDesc(i18n.T(`
Replace a resource by filename or stdin.
JSON and YAML formats are accepted. If replacing an existing resource, the
complete resource spec must be provided. This can be obtained by
$ kubectl get TYPE NAME -o yaml
Please refer to the models in https://htmlpreview.github.io/?https://github.com/kubernetes/kubernetes/blob/HEAD/docs/api-reference/v1/definitions.html to find if a field is mutable.`))
replaceExample = templates.Examples(i18n.T(`
# Replace a pod using the data in pod.json.
kubectl replace -f ./pod.json
# Replace a pod based on the JSON passed into stdin.
cat pod.json | kubectl replace -f -
# Update a single-container pod's image version (tag) to v4
kubectl get pod mypod -o yaml | sed 's/\(image: myimage\):.*$/\1:v4/' | kubectl replace -f -
# Force replace, delete and then re-create the resource
kubectl replace --force -f ./pod.json`))
)
type ReplaceOptions struct {
PrintFlags *genericclioptions.PrintFlags
DeleteFlags *DeleteFlags
RecordFlags *genericclioptions.RecordFlags
DeleteOptions *DeleteOptions
PrintObj func(obj runtime.Object) error
createAnnotation bool
validate bool
Schema validation.Schema
Builder func() *resource.Builder
BuilderArgs []string
Namespace string
EnforceNamespace bool
Recorder genericclioptions.Recorder
genericclioptions.IOStreams
}
func NewReplaceOptions(streams genericclioptions.IOStreams) *ReplaceOptions {
return &ReplaceOptions{
PrintFlags: genericclioptions.NewPrintFlags("replaced"),
DeleteFlags: NewDeleteFlags("to use to replace the resource."),
IOStreams: streams,
}
}
func NewCmdReplace(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewReplaceOptions(streams)
cmd := &cobra.Command{
Use: "replace -f FILENAME",
DisableFlagsInUseLine: true,
Short: i18n.T("Replace a resource by filename or stdin"),
Long: replaceLong,
Example: replaceExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))
cmdutil.CheckErr(o.Validate(cmd))
cmdutil.CheckErr(o.Run())
},
}
o.PrintFlags.AddFlags(cmd)
o.DeleteFlags.AddFlags(cmd)
o.RecordFlags.AddFlags(cmd)
cmd.MarkFlagRequired("filename")
cmdutil.AddValidateFlags(cmd)
cmdutil.AddApplyAnnotationFlags(cmd)
return cmd
}
func (o *ReplaceOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
var err error
o.RecordFlags.Complete(cmd)
o.Recorder, err = o.RecordFlags.ToRecorder()
if err != nil {
return err
}
o.validate = cmdutil.GetFlagBool(cmd, "validate")
o.createAnnotation = cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag)
printer, err := o.PrintFlags.ToPrinter()
if err != nil {
return err
}
o.PrintObj = func(obj runtime.Object) error {
return printer.PrintObj(obj, o.Out)
}
dynamicClient, err := f.DynamicClient()
if err != nil {
return err
}
deleteOpts := o.DeleteFlags.ToOptions(dynamicClient, o.IOStreams)
//Replace will create a resource if it doesn't exist already, so ignore not found error
deleteOpts.IgnoreNotFound = true
if o.PrintFlags.OutputFormat != nil {
deleteOpts.Output = *o.PrintFlags.OutputFormat
}
if deleteOpts.GracePeriod == 0 {
// To preserve backwards compatibility, but prevent accidental data loss, we convert --grace-period=0
// into --grace-period=1 and wait until the object is successfully deleted.
deleteOpts.GracePeriod = 1
deleteOpts.WaitForDeletion = true
}
o.DeleteOptions = deleteOpts
schema, err := f.Validator(o.validate)
if err != nil {
return err
}
o.Schema = schema
o.Builder = f.NewBuilder
o.BuilderArgs = args
o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
return nil
}
func (o *ReplaceOptions) Validate(cmd *cobra.Command) error {
if o.DeleteOptions.GracePeriod >= 0 && !o.DeleteOptions.ForceDeletion {
return fmt.Errorf("--grace-period must have --force specified")
}
if o.DeleteOptions.Timeout != 0 && !o.DeleteOptions.ForceDeletion {
return fmt.Errorf("--timeout must have --force specified")
}
if cmdutil.IsFilenameSliceEmpty(o.DeleteOptions.FilenameOptions.Filenames) {
return cmdutil.UsageErrorf(cmd, "Must specify --filename to replace")
}
return nil
}
func (o *ReplaceOptions) Run() error {
if o.DeleteOptions.ForceDeletion {
return o.forceReplace()
}
r := o.Builder().
Unstructured().
Schema(o.Schema).
ContinueOnError().
NamespaceParam(o.Namespace).DefaultNamespace().
FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
Flatten().
Do()
if err := r.Err(); err != nil {
return err
}
return r.Visit(func(info *resource.Info, err error) error {
if err != nil {
return err
}
if err := kubectl.CreateOrUpdateAnnotation(o.createAnnotation, info.Object, cmdutil.InternalVersionJSONEncoder()); err != nil {
return cmdutil.AddSourceToErr("replacing", info.Source, err)
}
if err := o.Recorder.Record(info.Object); err != nil {
glog.V(4).Infof("error recording current command: %v", err)
}
// Serialize the object with the annotation applied.
obj, err := resource.NewHelper(info.Client, info.Mapping).Replace(info.Namespace, info.Name, true, info.Object)
if err != nil {
return cmdutil.AddSourceToErr("replacing", info.Source, err)
}
info.Refresh(obj, true)
return o.PrintObj(info.Object)
})
}
func (o *ReplaceOptions) forceReplace() error {
for i, filename := range o.DeleteOptions.FilenameOptions.Filenames {
if filename == "-" {
tempDir, err := ioutil.TempDir("", "kubectl_replace_")
if err != nil {
return err
}
defer os.RemoveAll(tempDir)
tempFilename := filepath.Join(tempDir, "resource.stdin")
err = cmdutil.DumpReaderToFile(os.Stdin, tempFilename)
if err != nil {
return err
}
o.DeleteOptions.FilenameOptions.Filenames[i] = tempFilename
}
}
r := o.Builder().
Unstructured().
ContinueOnError().
NamespaceParam(o.Namespace).DefaultNamespace().
ResourceTypeOrNameArgs(false, o.BuilderArgs...).RequireObject(false).
FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
Flatten().
Do()
if err := r.Err(); err != nil {
return err
}
if err := o.DeleteOptions.DeleteResult(r); err != nil {
return err
}
timeout := o.DeleteOptions.Timeout
if timeout == 0 {
timeout = 5 * time.Minute
}
err := r.Visit(func(info *resource.Info, err error) error {
if err != nil {
return err
}
return wait.PollImmediate(1*time.Second, timeout, func() (bool, error) {
if err := info.Get(); !errors.IsNotFound(err) {
return false, err
}
return true, nil
})
})
if err != nil {
return err
}
r = o.Builder().
Unstructured().
Schema(o.Schema).
ContinueOnError().
NamespaceParam(o.Namespace).DefaultNamespace().
FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
Flatten().
Do()
err = r.Err()
if err != nil {
return err
}
count := 0
err = r.Visit(func(info *resource.Info, err error) error {
if err != nil {
return err
}
if err := kubectl.CreateOrUpdateAnnotation(o.createAnnotation, info.Object, cmdutil.InternalVersionJSONEncoder()); err != nil {
return err
}
if err := o.Recorder.Record(info.Object); err != nil {
glog.V(4).Infof("error recording current command: %v", err)
}
obj, err := resource.NewHelper(info.Client, info.Mapping).Create(info.Namespace, true, info.Object, nil)
if err != nil {
return err
}
count++
info.Refresh(obj, true)
return o.PrintObj(info.Object)
})
if err != nil {
return err
}
if count == 0 {
return fmt.Errorf("no objects passed to replace")
}
return nil
}