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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 (
"flag"
"fmt"
"io"
"os"
"os/exec"
"strings"
"syscall"
"github.com/spf13/cobra"
"k8s.io/client-go/tools/clientcmd"
cliflag "k8s.io/component-base/cli/flag"
"k8s.io/kubernetes/pkg/kubectl/cmd/annotate"
"k8s.io/kubernetes/pkg/kubectl/cmd/apiresources"
"k8s.io/kubernetes/pkg/kubectl/cmd/apply"
"k8s.io/kubernetes/pkg/kubectl/cmd/attach"
"k8s.io/kubernetes/pkg/kubectl/cmd/auth"
"k8s.io/kubernetes/pkg/kubectl/cmd/autoscale"
"k8s.io/kubernetes/pkg/kubectl/cmd/certificates"
"k8s.io/kubernetes/pkg/kubectl/cmd/clusterinfo"
"k8s.io/kubernetes/pkg/kubectl/cmd/completion"
cmdconfig "k8s.io/kubernetes/pkg/kubectl/cmd/config"
"k8s.io/kubernetes/pkg/kubectl/cmd/convert"
"k8s.io/kubernetes/pkg/kubectl/cmd/cp"
"k8s.io/kubernetes/pkg/kubectl/cmd/create"
"k8s.io/kubernetes/pkg/kubectl/cmd/delete"
"k8s.io/kubernetes/pkg/kubectl/cmd/describe"
"k8s.io/kubernetes/pkg/kubectl/cmd/diff"
"k8s.io/kubernetes/pkg/kubectl/cmd/drain"
"k8s.io/kubernetes/pkg/kubectl/cmd/edit"
cmdexec "k8s.io/kubernetes/pkg/kubectl/cmd/exec"
"k8s.io/kubernetes/pkg/kubectl/cmd/explain"
"k8s.io/kubernetes/pkg/kubectl/cmd/expose"
"k8s.io/kubernetes/pkg/kubectl/cmd/get"
"k8s.io/kubernetes/pkg/kubectl/cmd/label"
"k8s.io/kubernetes/pkg/kubectl/cmd/logs"
"k8s.io/kubernetes/pkg/kubectl/cmd/options"
"k8s.io/kubernetes/pkg/kubectl/cmd/patch"
"k8s.io/kubernetes/pkg/kubectl/cmd/plugin"
"k8s.io/kubernetes/pkg/kubectl/cmd/portforward"
"k8s.io/kubernetes/pkg/kubectl/cmd/proxy"
"k8s.io/kubernetes/pkg/kubectl/cmd/replace"
"k8s.io/kubernetes/pkg/kubectl/cmd/rollingupdate"
"k8s.io/kubernetes/pkg/kubectl/cmd/rollout"
"k8s.io/kubernetes/pkg/kubectl/cmd/run"
"k8s.io/kubernetes/pkg/kubectl/cmd/scale"
"k8s.io/kubernetes/pkg/kubectl/cmd/set"
"k8s.io/kubernetes/pkg/kubectl/cmd/taint"
"k8s.io/kubernetes/pkg/kubectl/cmd/top"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/cmd/version"
"k8s.io/kubernetes/pkg/kubectl/cmd/wait"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
"k8s.io/kubernetes/pkg/kubectl/util/templates"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/kubernetes/pkg/kubectl/cmd/kustomize"
)
const (
bashCompletionFunc = `# call kubectl get $1,
__kubectl_override_flag_list=(--kubeconfig --cluster --user --context --namespace --server -n -s)
__kubectl_override_flags()
{
local ${__kubectl_override_flag_list[*]##*-} two_word_of of var
for w in "${words[@]}"; do
if [ -n "${two_word_of}" ]; then
eval "${two_word_of##*-}=\"${two_word_of}=\${w}\""
two_word_of=
continue
fi
for of in "${__kubectl_override_flag_list[@]}"; do
case "${w}" in
${of}=*)
eval "${of##*-}=\"${w}\""
;;
${of})
two_word_of="${of}"
;;
esac
done
done
for var in "${__kubectl_override_flag_list[@]##*-}"; do
if eval "test -n \"\$${var}\""; then
eval "echo \${${var}}"
fi
done
}
__kubectl_config_get_contexts()
{
__kubectl_parse_config "contexts"
}
__kubectl_config_get_clusters()
{
__kubectl_parse_config "clusters"
}
__kubectl_config_get_users()
{
__kubectl_parse_config "users"
}
# $1 has to be "contexts", "clusters" or "users"
__kubectl_parse_config()
{
local template kubectl_out
template="{{ range .$1 }}{{ .name }} {{ end }}"
if kubectl_out=$(kubectl config $(__kubectl_override_flags) -o template --template="${template}" view 2>/dev/null); then
COMPREPLY=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
fi
}
# $1 is the name of resource (required)
# $2 is template string for kubectl get (optional)
__kubectl_parse_get()
{
local template
template="${2:-"{{ range .items }}{{ .metadata.name }} {{ end }}"}"
local kubectl_out
if kubectl_out=$(kubectl get $(__kubectl_override_flags) -o template --template="${template}" "$1" 2>/dev/null); then
COMPREPLY+=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
fi
}
__kubectl_get_resource()
{
if [[ ${#nouns[@]} -eq 0 ]]; then
local kubectl_out
if kubectl_out=$(kubectl api-resources $(__kubectl_override_flags) -o name --cached --request-timeout=5s --verbs=get 2>/dev/null); then
COMPREPLY=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
return 0
fi
return 1
fi
__kubectl_parse_get "${nouns[${#nouns[@]} -1]}"
}
__kubectl_get_resource_namespace()
{
__kubectl_parse_get "namespace"
}
__kubectl_get_resource_pod()
{
__kubectl_parse_get "pod"
}
__kubectl_get_resource_rc()
{
__kubectl_parse_get "rc"
}
__kubectl_get_resource_node()
{
__kubectl_parse_get "node"
}
__kubectl_get_resource_clusterrole()
{
__kubectl_parse_get "clusterrole"
}
# $1 is the name of the pod we want to get the list of containers inside
__kubectl_get_containers()
{
local template
template="{{ range .spec.initContainers }}{{ .name }} {{end}}{{ range .spec.containers }}{{ .name }} {{ end }}"
__kubectl_debug "${FUNCNAME} nouns are ${nouns[*]}"
local len="${#nouns[@]}"
if [[ ${len} -ne 1 ]]; then
return
fi
local last=${nouns[${len} -1]}
local kubectl_out
if kubectl_out=$(kubectl get $(__kubectl_override_flags) -o template --template="${template}" pods "${last}" 2>/dev/null); then
COMPREPLY=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
fi
}
# Require both a pod and a container to be specified
__kubectl_require_pod_and_container()
{
if [[ ${#nouns[@]} -eq 0 ]]; then
__kubectl_parse_get pods
return 0
fi;
__kubectl_get_containers
return 0
}
__kubectl_cp()
{
if [[ $(type -t compopt) = "builtin" ]]; then
compopt -o nospace
fi
case "$cur" in
/*|[.~]*) # looks like a path
return
;;
*:*) # TODO: complete remote files in the pod
return
;;
*/*) # complete <namespace>/<pod>
local template namespace kubectl_out
template="{{ range .items }}{{ .metadata.namespace }}/{{ .metadata.name }}: {{ end }}"
namespace="${cur%%/*}"
if kubectl_out=( $(kubectl get $(__kubectl_override_flags) --namespace "${namespace}" -o template --template="${template}" pods 2>/dev/null) ); then
COMPREPLY=( $(compgen -W "${kubectl_out[*]}" -- "${cur}") )
fi
return
;;
*) # complete namespaces, pods, and filedirs
__kubectl_parse_get "namespace" "{{ range .items }}{{ .metadata.name }}/ {{ end }}"
__kubectl_parse_get "pod" "{{ range .items }}{{ .metadata.name }}: {{ end }}"
_filedir
;;
esac
}
__custom_func() {
case ${last_command} in
kubectl_get | kubectl_describe | kubectl_delete | kubectl_label | kubectl_edit | kubectl_patch |\
kubectl_annotate | kubectl_expose | kubectl_scale | kubectl_autoscale | kubectl_taint | kubectl_rollout_* |\
kubectl_apply_edit-last-applied | kubectl_apply_view-last-applied)
__kubectl_get_resource
return
;;
kubectl_logs)
__kubectl_require_pod_and_container
return
;;
kubectl_exec | kubectl_port-forward | kubectl_top_pod | kubectl_attach)
__kubectl_get_resource_pod
return
;;
kubectl_rolling-update)
__kubectl_get_resource_rc
return
;;
kubectl_cordon | kubectl_uncordon | kubectl_drain | kubectl_top_node)
__kubectl_get_resource_node
return
;;
kubectl_config_use-context | kubectl_config_rename-context)
__kubectl_config_get_contexts
return
;;
kubectl_config_delete-cluster)
__kubectl_config_get_clusters
return
;;
kubectl_cp)
__kubectl_cp
return
;;
*)
;;
esac
}
`
)
var (
bashCompletionFlags = map[string]string{
"namespace": "__kubectl_get_resource_namespace",
"context": "__kubectl_config_get_contexts",
"cluster": "__kubectl_config_get_clusters",
"user": "__kubectl_config_get_users",
}
)
// NewDefaultKubectlCommand creates the `kubectl` command with default arguments
func NewDefaultKubectlCommand() *cobra.Command {
return NewDefaultKubectlCommandWithArgs(NewDefaultPluginHandler(plugin.ValidPluginFilenamePrefixes), os.Args, os.Stdin, os.Stdout, os.Stderr)
}
// NewDefaultKubectlCommandWithArgs creates the `kubectl` command with arguments
func NewDefaultKubectlCommandWithArgs(pluginHandler PluginHandler, args []string, in io.Reader, out, errout io.Writer) *cobra.Command {
cmd := NewKubectlCommand(in, out, errout)
if pluginHandler == nil {
return cmd
}
if len(args) > 1 {
cmdPathPieces := args[1:]
// only look for suitable extension executables if
// the specified command does not already exist
if _, _, err := cmd.Find(cmdPathPieces); err != nil {
if err := HandlePluginCommand(pluginHandler, cmdPathPieces); err != nil {
fmt.Fprintf(errout, "%v\n", err)
os.Exit(1)
}
}
}
return cmd
}
// PluginHandler is capable of parsing command line arguments
// and performing executable filename lookups to search
// for valid plugin files, and execute found plugins.
type PluginHandler interface {
// exists at the given filename, or a boolean false.
// Lookup will iterate over a list of given prefixes
// in order to recognize valid plugin filenames.
// The first filepath to match a prefix is returned.
Lookup(filename string) (string, bool)
// Execute receives an executable's filepath, a slice
// of arguments, and a slice of environment variables
// to relay to the executable.
Execute(executablePath string, cmdArgs, environment []string) error
}
// DefaultPluginHandler implements PluginHandler
type DefaultPluginHandler struct {
ValidPrefixes []string
}
// NewDefaultPluginHandler instantiates the DefaultPluginHandler with a list of
// given filename prefixes used to identify valid plugin filenames.
func NewDefaultPluginHandler(validPrefixes []string) *DefaultPluginHandler {
return &DefaultPluginHandler{
ValidPrefixes: validPrefixes,
}
}
// Lookup implements PluginHandler
func (h *DefaultPluginHandler) Lookup(filename string) (string, bool) {
for _, prefix := range h.ValidPrefixes {
path, err := exec.LookPath(fmt.Sprintf("%s-%s", prefix, filename))
if err != nil || len(path) == 0 {
continue
}
return path, true
}
return "", false
}
// Execute implements PluginHandler
func (h *DefaultPluginHandler) Execute(executablePath string, cmdArgs, environment []string) error {
return syscall.Exec(executablePath, cmdArgs, environment)
}
// HandlePluginCommand receives a pluginHandler and command-line arguments and attempts to find
// a plugin executable on the PATH that satisfies the given arguments.
func HandlePluginCommand(pluginHandler PluginHandler, cmdArgs []string) error {
remainingArgs := []string{} // all "non-flag" arguments
for idx := range cmdArgs {
if strings.HasPrefix(cmdArgs[idx], "-") {
break
}
remainingArgs = append(remainingArgs, strings.Replace(cmdArgs[idx], "-", "_", -1))
}
foundBinaryPath := ""
// attempt to find binary, starting at longest possible name with given cmdArgs
for len(remainingArgs) > 0 {
path, found := pluginHandler.Lookup(strings.Join(remainingArgs, "-"))
if !found {
remainingArgs = remainingArgs[:len(remainingArgs)-1]
continue
}
foundBinaryPath = path
break
}
if len(foundBinaryPath) == 0 {
return nil
}
// invoke cmd binary relaying the current environment and args given
// remainingArgs will always have at least one element.
// execve will make remainingArgs[0] the "binary name".
if err := pluginHandler.Execute(foundBinaryPath, append([]string{foundBinaryPath}, cmdArgs[len(remainingArgs):]...), os.Environ()); err != nil {
return err
}
return nil
}
// NewKubectlCommand creates the `kubectl` command and its nested children.
func NewKubectlCommand(in io.Reader, out, err io.Writer) *cobra.Command {
// Parent command to which all subcommands are added.
cmds := &cobra.Command{
Use: "kubectl",
Short: i18n.T("kubectl controls the Kubernetes cluster manager"),
Long: templates.LongDesc(`
kubectl controls the Kubernetes cluster manager.
Find more information at:
https://kubernetes.io/docs/reference/kubectl/overview/`),
Run: runHelp,
// Hook before and after Run initialize and write profiles to disk,
// respectively.
PersistentPreRunE: func(*cobra.Command, []string) error {
return initProfiling()
},
PersistentPostRunE: func(*cobra.Command, []string) error {
return flushProfiling()
},
BashCompletionFunction: bashCompletionFunc,
}
flags := cmds.PersistentFlags()
flags.SetNormalizeFunc(cliflag.WarnWordSepNormalizeFunc) // Warn for "_" flags
// Normalize all flags that are coming from other packages or pre-configurations
// a.k.a. change all "_" to "-". e.g. glog package
flags.SetNormalizeFunc(cliflag.WordSepNormalizeFunc)
addProfilingFlags(flags)
kubeConfigFlags := genericclioptions.NewConfigFlags(true).WithDeprecatedPasswordFlag()
kubeConfigFlags.AddFlags(flags)
matchVersionKubeConfigFlags := cmdutil.NewMatchVersionFlags(kubeConfigFlags)
matchVersionKubeConfigFlags.AddFlags(cmds.PersistentFlags())
cmds.PersistentFlags().AddGoFlagSet(flag.CommandLine)
f := cmdutil.NewFactory(matchVersionKubeConfigFlags)
// Sending in 'nil' for the getLanguageFn() results in using
// the LANG environment variable.
//
// TODO: Consider adding a flag or file preference for setting
// the language, instead of just loading from the LANG env. variable.
i18n.LoadTranslations("kubectl", nil)
// From this point and forward we get warnings on flags that contain "_" separators
cmds.SetGlobalNormalizationFunc(cliflag.WarnWordSepNormalizeFunc)
ioStreams := genericclioptions.IOStreams{In: in, Out: out, ErrOut: err}
groups := templates.CommandGroups{
{
Message: "Basic Commands (Beginner):",
Commands: []*cobra.Command{
create.NewCmdCreate(f, ioStreams),
expose.NewCmdExposeService(f, ioStreams),
run.NewCmdRun(f, ioStreams),
set.NewCmdSet(f, ioStreams),
},
},
{
Message: "Basic Commands (Intermediate):",
Commands: []*cobra.Command{
explain.NewCmdExplain("kubectl", f, ioStreams),
get.NewCmdGet("kubectl", f, ioStreams),
edit.NewCmdEdit(f, ioStreams),
delete.NewCmdDelete(f, ioStreams),
},
},
{
Message: "Deploy Commands:",
Commands: []*cobra.Command{
rollout.NewCmdRollout(f, ioStreams),
rollingupdate.NewCmdRollingUpdate(f, ioStreams),
scale.NewCmdScale(f, ioStreams),
autoscale.NewCmdAutoscale(f, ioStreams),
},
},
{
Message: "Cluster Management Commands:",
Commands: []*cobra.Command{
certificates.NewCmdCertificate(f, ioStreams),
clusterinfo.NewCmdClusterInfo(f, ioStreams),
top.NewCmdTop(f, ioStreams),
drain.NewCmdCordon(f, ioStreams),
drain.NewCmdUncordon(f, ioStreams),
drain.NewCmdDrain(f, ioStreams),
taint.NewCmdTaint(f, ioStreams),
},
},
{
Message: "Troubleshooting and Debugging Commands:",
Commands: []*cobra.Command{
describe.NewCmdDescribe("kubectl", f, ioStreams),
logs.NewCmdLogs(f, ioStreams),
attach.NewCmdAttach(f, ioStreams),
cmdexec.NewCmdExec(f, ioStreams),
portforward.NewCmdPortForward(f, ioStreams),
proxy.NewCmdProxy(f, ioStreams),
cp.NewCmdCp(f, ioStreams),
auth.NewCmdAuth(f, ioStreams),
},
},
{
Message: "Advanced Commands:",
Commands: []*cobra.Command{
diff.NewCmdDiff(f, ioStreams),
apply.NewCmdApply("kubectl", f, ioStreams),
patch.NewCmdPatch(f, ioStreams),
replace.NewCmdReplace(f, ioStreams),
wait.NewCmdWait(f, ioStreams),
convert.NewCmdConvert(f, ioStreams),
kustomize.NewCmdKustomize(ioStreams),
},
},
{
Message: "Settings Commands:",
Commands: []*cobra.Command{
label.NewCmdLabel(f, ioStreams),
annotate.NewCmdAnnotate("kubectl", f, ioStreams),
completion.NewCmdCompletion(ioStreams.Out, ""),
},
},
}
groups.Add(cmds)
filters := []string{"options"}
// Hide the "alpha" subcommand if there are no alpha commands in this build.
alpha := NewCmdAlpha(f, ioStreams)
if !alpha.HasSubCommands() {
filters = append(filters, alpha.Name())
}
templates.ActsAsRootCommand(cmds, filters, groups...)
for name, completion := range bashCompletionFlags {
if cmds.Flag(name) != nil {
if cmds.Flag(name).Annotations == nil {
cmds.Flag(name).Annotations = map[string][]string{}
}
cmds.Flag(name).Annotations[cobra.BashCompCustom] = append(
cmds.Flag(name).Annotations[cobra.BashCompCustom],
completion,
)
}
}
cmds.AddCommand(alpha)
cmds.AddCommand(cmdconfig.NewCmdConfig(f, clientcmd.NewDefaultPathOptions(), ioStreams))
cmds.AddCommand(plugin.NewCmdPlugin(f, ioStreams))
cmds.AddCommand(version.NewCmdVersion(f, ioStreams))
cmds.AddCommand(apiresources.NewCmdAPIVersions(f, ioStreams))
cmds.AddCommand(apiresources.NewCmdAPIResources(f, ioStreams))
cmds.AddCommand(options.NewCmdOptions(ioStreams.Out))
return cmds
}
func runHelp(cmd *cobra.Command, args []string) {
cmd.Help()
}
// deprecatedAlias is intended to be used to create a "wrapper" command around
// an existing command. The wrapper works the same but prints a deprecation
// message before running. This command is identical functionality.
func deprecatedAlias(deprecatedVersion string, cmd *cobra.Command) *cobra.Command {
// Have to be careful here because Cobra automatically extracts the name
// of the command from the .Use field.
originalName := cmd.Name()
cmd.Use = deprecatedVersion
cmd.Deprecated = fmt.Sprintf("use %q instead", originalName)
cmd.Short = fmt.Sprintf("%s. This command is deprecated, use %q instead", cmd.Short, originalName)
cmd.Hidden = true
return cmd
}

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