297 lines
9.6 KiB
Go
297 lines
9.6 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cmd
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import (
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/spf13/cobra"
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"github.com/golang/glog"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/pkg/kubectl"
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"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
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cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
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"k8s.io/kubernetes/pkg/kubectl/resource"
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)
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var (
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replace_long = templates.LongDesc(`
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Replace a resource by filename or stdin.
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JSON and YAML formats are accepted. If replacing an existing resource, the
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complete resource spec must be provided. This can be obtained by
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$ kubectl get TYPE NAME -o yaml
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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.`)
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replace_example = templates.Examples(`
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# Replace a pod using the data in pod.json.
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kubectl replace -f ./pod.json
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# Replace a pod based on the JSON passed into stdin.
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cat pod.json | kubectl replace -f -
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# Update a single-container pod's image version (tag) to v4
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kubectl get pod mypod -o yaml | sed 's/\(image: myimage\):.*$/\1:v4/' | kubectl replace -f -
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# Force replace, delete and then re-create the resource
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kubectl replace --force -f ./pod.json`)
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)
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func NewCmdReplace(f cmdutil.Factory, out io.Writer) *cobra.Command {
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options := &resource.FilenameOptions{}
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cmd := &cobra.Command{
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Use: "replace -f FILENAME",
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// update is deprecated.
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Aliases: []string{"update"},
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Short: "Replace a resource by filename or stdin",
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Long: replace_long,
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Example: replace_example,
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Run: func(cmd *cobra.Command, args []string) {
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cmdutil.CheckErr(cmdutil.ValidateOutputArgs(cmd))
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err := RunReplace(f, out, cmd, args, options)
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cmdutil.CheckErr(err)
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},
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}
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usage := "to use to replace the resource."
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cmdutil.AddFilenameOptionFlags(cmd, options, usage)
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cmd.MarkFlagRequired("filename")
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cmd.Flags().Bool("force", false, "Delete and re-create the specified resource")
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cmd.Flags().Bool("cascade", false, "Only relevant during a force replace. If true, cascade the deletion of the resources managed by this resource (e.g. Pods created by a ReplicationController).")
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cmd.Flags().Int("grace-period", -1, "Only relevant during a force replace. Period of time in seconds given to the old resource to terminate gracefully. Ignored if negative.")
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cmd.Flags().Duration("timeout", 0, "Only relevant during a force replace. The length of time to wait before giving up on a delete of the old resource, zero means determine a timeout from the size of the object. Any other values should contain a corresponding time unit (e.g. 1s, 2m, 3h).")
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cmdutil.AddValidateFlags(cmd)
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cmdutil.AddOutputFlagsForMutation(cmd)
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cmdutil.AddApplyAnnotationFlags(cmd)
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cmdutil.AddRecordFlag(cmd)
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cmdutil.AddInclude3rdPartyFlags(cmd)
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return cmd
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}
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func RunReplace(f cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string, options *resource.FilenameOptions) error {
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if len(os.Args) > 1 && os.Args[1] == "update" {
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printDeprecationWarning("replace", "update")
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}
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schema, err := f.Validator(cmdutil.GetFlagBool(cmd, "validate"), cmdutil.GetFlagString(cmd, "schema-cache-dir"))
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if err != nil {
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return err
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}
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cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
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if err != nil {
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return err
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}
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force := cmdutil.GetFlagBool(cmd, "force")
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if cmdutil.IsFilenameEmpty(options.Filenames) {
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return cmdutil.UsageError(cmd, "Must specify --filename to replace")
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}
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shortOutput := cmdutil.GetFlagString(cmd, "output") == "name"
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if force {
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return forceReplace(f, out, cmd, args, shortOutput, options)
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}
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if cmdutil.GetFlagInt(cmd, "grace-period") >= 0 {
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return fmt.Errorf("--grace-period must have --force specified")
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}
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if cmdutil.GetFlagDuration(cmd, "timeout") != 0 {
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return fmt.Errorf("--timeout must have --force specified")
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}
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mapper, typer, err := f.UnstructuredObject()
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if err != nil {
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return err
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}
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r := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.UnstructuredClientForMapping), unstructured.UnstructuredJSONScheme).
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Schema(schema).
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ContinueOnError().
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NamespaceParam(cmdNamespace).DefaultNamespace().
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FilenameParam(enforceNamespace, options).
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Flatten().
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Do()
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err = r.Err()
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if err != nil {
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return err
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}
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return r.Visit(func(info *resource.Info, err error) error {
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if err != nil {
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return err
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}
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if err := kubectl.CreateOrUpdateAnnotation(cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag), info, f.JSONEncoder()); err != nil {
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return cmdutil.AddSourceToErr("replacing", info.Source, err)
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}
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if cmdutil.ShouldRecord(cmd, info) {
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if err := cmdutil.RecordChangeCause(info.Object, f.Command()); err != nil {
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return cmdutil.AddSourceToErr("replacing", info.Source, err)
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}
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}
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// Serialize the object with the annotation applied.
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obj, err := resource.NewHelper(info.Client, info.Mapping).Replace(info.Namespace, info.Name, true, info.Object)
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if err != nil {
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return cmdutil.AddSourceToErr("replacing", info.Source, err)
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}
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info.Refresh(obj, true)
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f.PrintObjectSpecificMessage(obj, out)
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cmdutil.PrintSuccess(mapper, shortOutput, out, info.Mapping.Resource, info.Name, false, "replaced")
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return nil
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})
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}
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func forceReplace(f cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string, shortOutput bool, options *resource.FilenameOptions) error {
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schema, err := f.Validator(cmdutil.GetFlagBool(cmd, "validate"), cmdutil.GetFlagString(cmd, "schema-cache-dir"))
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if err != nil {
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return err
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}
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cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
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if err != nil {
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return err
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}
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for i, filename := range options.Filenames {
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if filename == "-" {
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tempDir, err := ioutil.TempDir("", "kubectl_replace_")
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if err != nil {
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return err
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}
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defer os.RemoveAll(tempDir)
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tempFilename := filepath.Join(tempDir, "resource.stdin")
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err = cmdutil.DumpReaderToFile(os.Stdin, tempFilename)
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if err != nil {
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return err
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}
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options.Filenames[i] = tempFilename
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}
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}
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mapper, typer, err := f.UnstructuredObject()
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if err != nil {
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return err
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}
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r := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.UnstructuredClientForMapping), unstructured.UnstructuredJSONScheme).
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ContinueOnError().
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NamespaceParam(cmdNamespace).DefaultNamespace().
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FilenameParam(enforceNamespace, options).
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ResourceTypeOrNameArgs(false, args...).RequireObject(false).
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Flatten().
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Do()
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err = r.Err()
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if err != nil {
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return err
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}
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//Replace will create a resource if it doesn't exist already, so ignore not found error
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ignoreNotFound := true
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timeout := cmdutil.GetFlagDuration(cmd, "timeout")
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gracePeriod := cmdutil.GetFlagInt(cmd, "grace-period")
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waitForDeletion := false
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if gracePeriod == 0 {
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// To preserve backwards compatibility, but prevent accidental data loss, we convert --grace-period=0
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// into --grace-period=1 and wait until the object is successfully deleted.
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gracePeriod = 1
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waitForDeletion = true
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}
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// By default use a reaper to delete all related resources.
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if cmdutil.GetFlagBool(cmd, "cascade") {
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glog.Warningf("\"cascade\" is set, kubectl will delete and re-create all resources managed by this resource (e.g. Pods created by a ReplicationController). Consider using \"kubectl rolling-update\" if you want to update a ReplicationController together with its Pods.")
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err = ReapResult(r, f, out, cmdutil.GetFlagBool(cmd, "cascade"), ignoreNotFound, timeout, gracePeriod, waitForDeletion, shortOutput, mapper, false)
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} else {
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err = DeleteResult(r, out, ignoreNotFound, shortOutput, mapper)
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}
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if err != nil {
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return err
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}
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if timeout == 0 {
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timeout = kubectl.Timeout
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}
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r.Visit(func(info *resource.Info, err error) error {
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if err != nil {
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return err
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}
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return wait.PollImmediate(kubectl.Interval, timeout, func() (bool, error) {
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if err := info.Get(); !errors.IsNotFound(err) {
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return false, err
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}
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return true, nil
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})
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})
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r = resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.UnstructuredClientForMapping), unstructured.UnstructuredJSONScheme).
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Schema(schema).
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ContinueOnError().
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NamespaceParam(cmdNamespace).DefaultNamespace().
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FilenameParam(enforceNamespace, options).
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Flatten().
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Do()
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err = r.Err()
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if err != nil {
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return err
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}
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count := 0
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err = r.Visit(func(info *resource.Info, err error) error {
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if err != nil {
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return err
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}
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if err := kubectl.CreateOrUpdateAnnotation(cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag), info, f.JSONEncoder()); err != nil {
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return err
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}
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if cmdutil.ShouldRecord(cmd, info) {
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if err := cmdutil.RecordChangeCause(info.Object, f.Command()); err != nil {
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return cmdutil.AddSourceToErr("replacing", info.Source, err)
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}
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}
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obj, err := resource.NewHelper(info.Client, info.Mapping).Create(info.Namespace, true, info.Object)
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if err != nil {
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return err
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}
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count++
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info.Refresh(obj, true)
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f.PrintObjectSpecificMessage(obj, out)
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cmdutil.PrintSuccess(mapper, shortOutput, out, info.Mapping.Resource, info.Name, false, "replaced")
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return nil
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})
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if err != nil {
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return err
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}
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if count == 0 {
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return fmt.Errorf("no objects passed to replace")
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}
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return nil
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}
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