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describe.go
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describe.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"
"strings"
"github.com/spf13/cobra"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/cli-runtime/pkg/genericclioptions/resource"
"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/printers"
)
var (
describeLong = templates.LongDesc(`
Show details of a specific resource or group of resources
Print a detailed description of the selected resources, including related resources such
as events or controllers. You may select a single object by name, all objects of that
type, provide a name prefix, or label selector. For example:
$ kubectl describe TYPE NAME_PREFIX
will first check for an exact match on TYPE and NAME_PREFIX. If no such resource
exists, it will output details for every resource that has a name prefixed with NAME_PREFIX.`)
describeExample = templates.Examples(i18n.T(`
# Describe a node
kubectl describe nodes kubernetes-node-emt8.c.myproject.internal
# Describe a pod
kubectl describe pods/nginx
# Describe a pod identified by type and name in "pod.json"
kubectl describe -f pod.json
# Describe all pods
kubectl describe pods
# Describe pods by label name=myLabel
kubectl describe po -l name=myLabel
# Describe all pods managed by the 'frontend' replication controller (rc-created pods
# get the name of the rc as a prefix in the pod the name).
kubectl describe pods frontend`))
)
type DescribeOptions struct {
CmdParent string
Selector string
Namespace string
Describer func(*meta.RESTMapping) (printers.Describer, error)
NewBuilder func() *resource.Builder
BuilderArgs []string
EnforceNamespace bool
AllNamespaces bool
IncludeUninitialized bool
DescriberSettings *printers.DescriberSettings
FilenameOptions *resource.FilenameOptions
genericclioptions.IOStreams
}
func NewCmdDescribe(parent string, f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := &DescribeOptions{
FilenameOptions: &resource.FilenameOptions{},
DescriberSettings: &printers.DescriberSettings{
ShowEvents: true,
},
CmdParent: parent,
IOStreams: streams,
}
cmd := &cobra.Command{
Use: "describe (-f FILENAME | TYPE [NAME_PREFIX | -l label] | TYPE/NAME)",
DisableFlagsInUseLine: true,
Short: i18n.T("Show details of a specific resource or group of resources"),
Long: describeLong + "\n\n" + cmdutil.SuggestApiResources(parent),
Example: describeExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))
cmdutil.CheckErr(o.Run())
},
}
usage := "containing the resource to describe"
cmdutil.AddFilenameOptionFlags(cmd, o.FilenameOptions, usage)
cmd.Flags().StringVarP(&o.Selector, "selector", "l", o.Selector, "Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
cmd.Flags().BoolVar(&o.AllNamespaces, "all-namespaces", o.AllNamespaces, "If present, list the requested object(s) across all namespaces. Namespace in current context is ignored even if specified with --namespace.")
cmd.Flags().BoolVar(&o.DescriberSettings.ShowEvents, "show-events", o.DescriberSettings.ShowEvents, "If true, display events related to the described object.")
cmdutil.AddIncludeUninitializedFlag(cmd)
return cmd
}
func (o *DescribeOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
var err error
o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
if o.AllNamespaces {
o.EnforceNamespace = false
}
if len(args) == 0 && cmdutil.IsFilenameSliceEmpty(o.FilenameOptions.Filenames) {
return fmt.Errorf("You must specify the type of resource to describe. %s\n", cmdutil.SuggestApiResources(o.CmdParent))
}
o.BuilderArgs = args
o.Describer = func(mapping *meta.RESTMapping) (printers.Describer, error) {
return cmdutil.DescriberFn(f, mapping)
}
o.NewBuilder = f.NewBuilder
// include the uninitialized objects by default
// unless user explicitly set --include-uninitialized=false
o.IncludeUninitialized = cmdutil.ShouldIncludeUninitialized(cmd, true)
return nil
}
func (o *DescribeOptions) Validate(args []string) error {
return nil
}
func (o *DescribeOptions) Run() error {
r := o.NewBuilder().
Unstructured().
ContinueOnError().
NamespaceParam(o.Namespace).DefaultNamespace().AllNamespaces(o.AllNamespaces).
FilenameParam(o.EnforceNamespace, o.FilenameOptions).
LabelSelectorParam(o.Selector).
IncludeUninitialized(o.IncludeUninitialized).
ResourceTypeOrNameArgs(true, o.BuilderArgs...).
Flatten().
Do()
err := r.Err()
if err != nil {
return err
}
allErrs := []error{}
infos, err := r.Infos()
if err != nil {
if apierrors.IsNotFound(err) && len(o.BuilderArgs) == 2 {
return o.DescribeMatchingResources(err, o.BuilderArgs[0], o.BuilderArgs[1])
}
allErrs = append(allErrs, err)
}
errs := sets.NewString()
first := true
for _, info := range infos {
mapping := info.ResourceMapping()
describer, err := o.Describer(mapping)
if err != nil {
if errs.Has(err.Error()) {
continue
}
allErrs = append(allErrs, err)
errs.Insert(err.Error())
continue
}
s, err := describer.Describe(info.Namespace, info.Name, *o.DescriberSettings)
if err != nil {
if errs.Has(err.Error()) {
continue
}
allErrs = append(allErrs, err)
errs.Insert(err.Error())
continue
}
if first {
first = false
fmt.Fprint(o.Out, s)
} else {
fmt.Fprintf(o.Out, "\n\n%s", s)
}
}
return utilerrors.NewAggregate(allErrs)
}
func (o *DescribeOptions) DescribeMatchingResources(originalError error, resource, prefix string) error {
r := o.NewBuilder().
Unstructured().
NamespaceParam(o.Namespace).DefaultNamespace().
ResourceTypeOrNameArgs(true, resource).
SingleResourceType().
Flatten().
Do()
mapping, err := r.ResourceMapping()
if err != nil {
return err
}
describer, err := o.Describer(mapping)
if err != nil {
return err
}
infos, err := r.Infos()
if err != nil {
return err
}
isFound := false
for ix := range infos {
info := infos[ix]
if strings.HasPrefix(info.Name, prefix) {
isFound = true
s, err := describer.Describe(info.Namespace, info.Name, *o.DescriberSettings)
if err != nil {
return err
}
fmt.Fprintf(o.Out, "%s\n", s)
}
}
if !isFound {
return originalError
}
return nil
}