347 lines
12 KiB
Go
347 lines
12 KiB
Go
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/*
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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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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"github.com/golang/glog"
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"github.com/spf13/cobra"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/api"
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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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"k8s.io/kubernetes/pkg/util/i18n"
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"k8s.io/kubernetes/pkg/util/strategicpatch"
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)
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// AnnotateOptions have the data required to perform the annotate operation
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type AnnotateOptions struct {
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// Filename options
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resource.FilenameOptions
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// Common user flags
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overwrite bool
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local bool
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dryrun bool
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all bool
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resourceVersion string
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selector string
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outputFormat string
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recordChangeCause bool
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// results of arg parsing
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resources []string
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newAnnotations map[string]string
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removeAnnotations []string
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// Common share fields
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out io.Writer
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}
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var (
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annotate_long = templates.LongDesc(`
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Update the annotations on one or more resources.
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* An annotation is a key/value pair that can hold larger (compared to a label), and possibly not human-readable, data.
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* It is intended to store non-identifying auxiliary data, especially data manipulated by tools and system extensions.
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* If --overwrite is true, then existing annotations can be overwritten, otherwise attempting to overwrite an annotation will result in an error.
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* If --resource-version is specified, then updates will use this resource version, otherwise the existing resource-version will be used.
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` + valid_resources)
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annotate_example = templates.Examples(`
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# Update pod 'foo' with the annotation 'description' and the value 'my frontend'.
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# If the same annotation is set multiple times, only the last value will be applied
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kubectl annotate pods foo description='my frontend'
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# Update a pod identified by type and name in "pod.json"
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kubectl annotate -f pod.json description='my frontend'
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# Update pod 'foo' with the annotation 'description' and the value 'my frontend running nginx', overwriting any existing value.
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kubectl annotate --overwrite pods foo description='my frontend running nginx'
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# Update all pods in the namespace
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kubectl annotate pods --all description='my frontend running nginx'
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# Update pod 'foo' only if the resource is unchanged from version 1.
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kubectl annotate pods foo description='my frontend running nginx' --resource-version=1
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# Update pod 'foo' by removing an annotation named 'description' if it exists.
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# Does not require the --overwrite flag.
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kubectl annotate pods foo description-`)
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)
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func NewCmdAnnotate(f cmdutil.Factory, out io.Writer) *cobra.Command {
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options := &AnnotateOptions{}
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// retrieve a list of handled resources from printer as valid args
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validArgs, argAliases := []string{}, []string{}
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p, err := f.Printer(nil, kubectl.PrintOptions{
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ColumnLabels: []string{},
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})
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cmdutil.CheckErr(err)
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if p != nil {
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validArgs = p.HandledResources()
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argAliases = kubectl.ResourceAliases(validArgs)
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}
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cmd := &cobra.Command{
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Use: "annotate [--overwrite] (-f FILENAME | TYPE NAME) KEY_1=VAL_1 ... KEY_N=VAL_N [--resource-version=version]",
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Short: i18n.T("Update the annotations on a resource"),
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Long: annotate_long,
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Example: annotate_example,
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Run: func(cmd *cobra.Command, args []string) {
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if err := options.Complete(f, out, cmd, args); err != nil {
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cmdutil.CheckErr(cmdutil.UsageError(cmd, err.Error()))
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}
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if err := options.Validate(); err != nil {
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cmdutil.CheckErr(cmdutil.UsageError(cmd, err.Error()))
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}
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cmdutil.CheckErr(options.RunAnnotate(f, cmd))
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},
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ValidArgs: validArgs,
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ArgAliases: argAliases,
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}
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cmdutil.AddPrinterFlags(cmd)
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cmd.Flags().Bool("overwrite", false, "If true, allow annotations to be overwritten, otherwise reject annotation updates that overwrite existing annotations.")
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cmd.Flags().Bool("local", false, "If true, annotation will NOT contact api-server but run locally.")
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cmd.Flags().StringP("selector", "l", "", "Selector (label query) to filter on, supports '=', '==', and '!='.")
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cmd.Flags().Bool("all", false, "select all resources in the namespace of the specified resource types")
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cmd.Flags().String("resource-version", "", "If non-empty, the annotation update will only succeed if this is the current resource-version for the object. Only valid when specifying a single resource.")
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usage := "identifying the resource to update the annotation"
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cmdutil.AddFilenameOptionFlags(cmd, &options.FilenameOptions, usage)
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cmdutil.AddDryRunFlag(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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// Complete adapts from the command line args and factory to the data required.
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func (o *AnnotateOptions) Complete(f cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string) (err error) {
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o.out = out
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o.local = cmdutil.GetFlagBool(cmd, "local")
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o.overwrite = cmdutil.GetFlagBool(cmd, "overwrite")
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o.all = cmdutil.GetFlagBool(cmd, "all")
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o.resourceVersion = cmdutil.GetFlagString(cmd, "resource-version")
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o.selector = cmdutil.GetFlagString(cmd, "selector")
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o.outputFormat = cmdutil.GetFlagString(cmd, "output")
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o.dryrun = cmdutil.GetDryRunFlag(cmd)
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o.recordChangeCause = cmdutil.GetRecordFlag(cmd)
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// retrieves resource and annotation args from args
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// also checks args to verify that all resources are specified before annotations
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resources, annotationArgs, err := cmdutil.GetResourcesAndPairs(args, "annotation")
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if err != nil {
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return err
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}
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o.resources = resources
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o.newAnnotations, o.removeAnnotations, err = parseAnnotations(annotationArgs)
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return err
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}
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// Validate checks to the AnnotateOptions to see if there is sufficient information run the command.
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func (o AnnotateOptions) Validate() error {
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if len(o.resources) < 1 && cmdutil.IsFilenameEmpty(o.Filenames) {
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return fmt.Errorf("one or more resources must be specified as <resource> <name> or <resource>/<name>")
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}
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if len(o.newAnnotations) < 1 && len(o.removeAnnotations) < 1 {
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return fmt.Errorf("at least one annotation update is required")
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}
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return validateAnnotations(o.removeAnnotations, o.newAnnotations)
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}
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// RunAnnotate does the work
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func (o AnnotateOptions) RunAnnotate(f cmdutil.Factory, cmd *cobra.Command) error {
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namespace, 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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changeCause := f.Command()
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mapper, typer := f.Object()
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b := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.ClientForMapping), f.Decoder(true)).
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ContinueOnError().
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NamespaceParam(namespace).DefaultNamespace().
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FilenameParam(enforceNamespace, &o.FilenameOptions).
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Flatten()
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if !o.local {
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b = b.SelectorParam(o.selector).
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ResourceTypeOrNameArgs(o.all, o.resources...).
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Latest()
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}
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r := b.Do()
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if err := r.Err(); err != nil {
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return err
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}
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var singleItemImpliedResource bool
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r.IntoSingleItemImplied(&singleItemImpliedResource)
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// only apply resource version locking on a single resource.
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// we must perform this check after o.builder.Do() as
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// []o.resources can not not accurately return the proper number
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// of resources when they are not passed in "resource/name" format.
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if !singleItemImpliedResource && len(o.resourceVersion) > 0 {
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return fmt.Errorf("--resource-version may only be used with a single resource")
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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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var outputObj runtime.Object
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obj, err := cmdutil.MaybeConvertObject(info.Object, info.Mapping.GroupVersionKind.GroupVersion(), info.Mapping)
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if err != nil {
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return err
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}
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if o.dryrun || o.local {
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if err := o.updateAnnotations(obj); err != nil {
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return err
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}
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outputObj = obj
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} else {
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name, namespace := info.Name, info.Namespace
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oldData, err := json.Marshal(obj)
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if err != nil {
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return err
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}
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// If we should record change-cause, add it to new annotations
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if cmdutil.ContainsChangeCause(info) || o.recordChangeCause {
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o.newAnnotations[kubectl.ChangeCauseAnnotation] = changeCause
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}
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if err := o.updateAnnotations(obj); err != nil {
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return err
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}
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newData, err := json.Marshal(obj)
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if err != nil {
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return err
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}
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patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, obj)
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createdPatch := err == nil
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if err != nil {
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glog.V(2).Infof("couldn't compute patch: %v", err)
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}
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mapping := info.ResourceMapping()
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client, err := f.ClientForMapping(mapping)
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if err != nil {
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return err
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}
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helper := resource.NewHelper(client, mapping)
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if createdPatch {
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outputObj, err = helper.Patch(namespace, name, api.StrategicMergePatchType, patchBytes)
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} else {
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outputObj, err = helper.Replace(namespace, name, false, obj)
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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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}
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if o.outputFormat != "" {
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return f.PrintObject(cmd, mapper, outputObj, o.out)
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}
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cmdutil.PrintSuccess(mapper, false, o.out, info.Mapping.Resource, info.Name, o.dryrun, "annotated")
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return nil
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})
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}
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// parseAnnotations retrieves new and remove annotations from annotation args
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func parseAnnotations(annotationArgs []string) (map[string]string, []string, error) {
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return cmdutil.ParsePairs(annotationArgs, "annotation", true)
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}
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// validateAnnotations checks the format of annotation args and checks removed annotations aren't in the new annotations map
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func validateAnnotations(removeAnnotations []string, newAnnotations map[string]string) error {
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var modifyRemoveBuf bytes.Buffer
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for _, removeAnnotation := range removeAnnotations {
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if _, found := newAnnotations[removeAnnotation]; found {
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if modifyRemoveBuf.Len() > 0 {
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modifyRemoveBuf.WriteString(", ")
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}
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modifyRemoveBuf.WriteString(fmt.Sprintf(removeAnnotation))
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}
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}
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if modifyRemoveBuf.Len() > 0 {
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return fmt.Errorf("can not both modify and remove the following annotation(s) in the same command: %s", modifyRemoveBuf.String())
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}
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return nil
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}
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// validateNoAnnotationOverwrites validates that when overwrite is false, to-be-updated annotations don't exist in the object annotation map (yet)
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func validateNoAnnotationOverwrites(accessor meta.Object, annotations map[string]string) error {
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var buf bytes.Buffer
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for key := range annotations {
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// change-cause annotation can always be overwritten
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if key == kubectl.ChangeCauseAnnotation {
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continue
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}
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if value, found := accessor.GetAnnotations()[key]; found {
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if buf.Len() > 0 {
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buf.WriteString("; ")
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}
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buf.WriteString(fmt.Sprintf("'%s' already has a value (%s)", key, value))
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}
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}
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if buf.Len() > 0 {
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return fmt.Errorf("--overwrite is false but found the following declared annotation(s): %s", buf.String())
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}
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return nil
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}
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// updateAnnotations updates annotations of obj
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func (o AnnotateOptions) updateAnnotations(obj runtime.Object) error {
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accessor, err := meta.Accessor(obj)
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if err != nil {
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return err
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}
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if !o.overwrite {
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if err := validateNoAnnotationOverwrites(accessor, o.newAnnotations); err != nil {
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return err
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}
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}
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annotations := accessor.GetAnnotations()
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if annotations == nil {
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annotations = make(map[string]string)
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}
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for key, value := range o.newAnnotations {
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annotations[key] = value
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}
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for _, annotation := range o.removeAnnotations {
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delete(annotations, annotation)
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}
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accessor.SetAnnotations(annotations)
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if len(o.resourceVersion) != 0 {
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accessor.SetResourceVersion(o.resourceVersion)
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}
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return nil
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}
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