diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
index bcb58c4ff0b..570169a4433 100644
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@@ -2567,13 +2567,13 @@
 		},
 		{
 			"ImportPath": "github.com/spf13/cobra",
-			"Comment": "v0.0.1-10-g19e54c4",
-			"Rev": "19e54c4a2b8a78c9d54b2bed61b1a6c5e1bfcf6f"
+			"Comment": "v0.0.1-28-gfd32f09",
+			"Rev": "fd32f09af19efc9b1279c54e0d8ed23f66232a15"
 		},
 		{
 			"ImportPath": "github.com/spf13/cobra/doc",
-			"Comment": "v0.0.1-10-g19e54c4",
-			"Rev": "19e54c4a2b8a78c9d54b2bed61b1a6c5e1bfcf6f"
+			"Comment": "v0.0.1-28-gfd32f09",
+			"Rev": "fd32f09af19efc9b1279c54e0d8ed23f66232a15"
 		},
 		{
 			"ImportPath": "github.com/spf13/jwalterweatherman",
diff --git a/staging/src/k8s.io/apiextensions-apiserver/Godeps/Godeps.json b/staging/src/k8s.io/apiextensions-apiserver/Godeps/Godeps.json
index f3c20dfe3b3..5fb6794915d 100644
--- a/staging/src/k8s.io/apiextensions-apiserver/Godeps/Godeps.json
+++ b/staging/src/k8s.io/apiextensions-apiserver/Godeps/Godeps.json
@@ -584,7 +584,7 @@
 		},
 		{
 			"ImportPath": "github.com/spf13/cobra",
-			"Rev": "19e54c4a2b8a78c9d54b2bed61b1a6c5e1bfcf6f"
+			"Rev": "fd32f09af19efc9b1279c54e0d8ed23f66232a15"
 		},
 		{
 			"ImportPath": "github.com/spf13/pflag",
diff --git a/staging/src/k8s.io/kube-aggregator/Godeps/Godeps.json b/staging/src/k8s.io/kube-aggregator/Godeps/Godeps.json
index 1734bc6f922..144e6ddbac7 100644
--- a/staging/src/k8s.io/kube-aggregator/Godeps/Godeps.json
+++ b/staging/src/k8s.io/kube-aggregator/Godeps/Godeps.json
@@ -268,7 +268,7 @@
 		},
 		{
 			"ImportPath": "github.com/spf13/cobra",
-			"Rev": "19e54c4a2b8a78c9d54b2bed61b1a6c5e1bfcf6f"
+			"Rev": "fd32f09af19efc9b1279c54e0d8ed23f66232a15"
 		},
 		{
 			"ImportPath": "github.com/spf13/pflag",
diff --git a/staging/src/k8s.io/sample-apiserver/Godeps/Godeps.json b/staging/src/k8s.io/sample-apiserver/Godeps/Godeps.json
index 95e9145401e..aa0331d2ebc 100644
--- a/staging/src/k8s.io/sample-apiserver/Godeps/Godeps.json
+++ b/staging/src/k8s.io/sample-apiserver/Godeps/Godeps.json
@@ -252,7 +252,7 @@
 		},
 		{
 			"ImportPath": "github.com/spf13/cobra",
-			"Rev": "19e54c4a2b8a78c9d54b2bed61b1a6c5e1bfcf6f"
+			"Rev": "fd32f09af19efc9b1279c54e0d8ed23f66232a15"
 		},
 		{
 			"ImportPath": "github.com/spf13/pflag",
diff --git a/vendor/github.com/spf13/cobra/README.md b/vendor/github.com/spf13/cobra/README.md
index d7279e4f9f9..851fcc087ca 100644
--- a/vendor/github.com/spf13/cobra/README.md
+++ b/vendor/github.com/spf13/cobra/README.md
@@ -20,6 +20,7 @@ Many of the most widely used Go projects are built using Cobra including:
 * [Nanobox](https://github.com/nanobox-io/nanobox)/[Nanopack](https://github.com/nanopack)
 * [rclone](http://rclone.org/)
 * [nehm](https://github.com/bogem/nehm)
+* [Pouch](https://github.com/alibaba/pouch)
 
 [![Build Status](https://travis-ci.org/spf13/cobra.svg "Travis CI status")](https://travis-ci.org/spf13/cobra)
 [![CircleCI status](https://circleci.com/gh/spf13/cobra.png?circle-token=:circle-token "CircleCI status")](https://circleci.com/gh/spf13/cobra)
@@ -158,10 +159,7 @@ import (
 )
 
 func main() {
-  if err := cmd.RootCmd.Execute(); err != nil {
-    fmt.Println(err)
-    os.Exit(1)
-  }
+  cmd.Execute()
 }
 ```
 
@@ -174,7 +172,7 @@ commands you want. It's the easiest way to incorporate Cobra into your applicati
 
 ## Using the Cobra Library
 
-To manually implement Cobra you need to create a bare main.go file and a RootCmd file.
+To manually implement Cobra you need to create a bare main.go file and a rootCmd file.
 You will optionally provide additional commands as you see fit.
 
 ### Create rootCmd
@@ -184,7 +182,7 @@ Cobra doesn't require any special constructors. Simply create your commands.
 Ideally you place this in app/cmd/root.go:
 
 ```go
-var RootCmd = &cobra.Command{
+var rootCmd = &cobra.Command{
   Use:   "hugo",
   Short: "Hugo is a very fast static site generator",
   Long: `A Fast and Flexible Static Site Generator built with
@@ -194,6 +192,13 @@ var RootCmd = &cobra.Command{
     // Do Stuff Here
   },
 }
+
+func Execute() {
+  if err := rootCmd.Execute(); err != nil {
+    fmt.Println(err)
+    os.Exit(1)
+  }
+}
 ```
 
 You will additionally define flags and handle configuration in your init() function.
@@ -212,14 +217,14 @@ import (
 
 func init() {
   cobra.OnInitialize(initConfig)
-  RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
-  RootCmd.PersistentFlags().StringVarP(&projectBase, "projectbase", "b", "", "base project directory eg. github.com/spf13/")
-  RootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "Author name for copyright attribution")
-  RootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "Name of license for the project (can provide `licensetext` in config)")
-  RootCmd.PersistentFlags().Bool("viper", true, "Use Viper for configuration")
-  viper.BindPFlag("author", RootCmd.PersistentFlags().Lookup("author"))
-  viper.BindPFlag("projectbase", RootCmd.PersistentFlags().Lookup("projectbase"))
-  viper.BindPFlag("useViper", RootCmd.PersistentFlags().Lookup("viper"))
+  rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
+  rootCmd.PersistentFlags().StringVarP(&projectBase, "projectbase", "b", "", "base project directory eg. github.com/spf13/")
+  rootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "Author name for copyright attribution")
+  rootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "Name of license for the project (can provide `licensetext` in config)")
+  rootCmd.PersistentFlags().Bool("viper", true, "Use Viper for configuration")
+  viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
+  viper.BindPFlag("projectbase", rootCmd.PersistentFlags().Lookup("projectbase"))
+  viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper"))
   viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
   viper.SetDefault("license", "apache")
 }
@@ -267,10 +272,7 @@ import (
 )
 
 func main() {
-  if err := cmd.RootCmd.Execute(); err != nil {
-    fmt.Println(err)
-    os.Exit(1)
-  }
+  cmd.Execute()
 }
 ```
 
@@ -286,12 +288,13 @@ populate it with the following:
 package cmd
 
 import (
-  "github.com/spf13/cobra"
   "fmt"
+
+  "github.com/spf13/cobra"
 )
 
 func init() {
-  RootCmd.AddCommand(versionCmd)
+  rootCmd.AddCommand(versionCmd)
 }
 
 var versionCmd = &cobra.Command{
@@ -328,7 +331,7 @@ command it's assigned to as well as every command under that command. For
 global flags, assign a flag as a persistent flag on the root.
 
 ```go
-RootCmd.PersistentFlags().BoolVarP(&Verbose, "verbose", "v", false, "verbose output")
+rootCmd.PersistentFlags().BoolVarP(&Verbose, "verbose", "v", false, "verbose output")
 ```
 
 ### Local Flags
@@ -336,13 +339,13 @@ RootCmd.PersistentFlags().BoolVarP(&Verbose, "verbose", "v", false, "verbose out
 A flag can also be assigned locally which will only apply to that specific command.
 
 ```go
-RootCmd.Flags().StringVarP(&Source, "source", "s", "", "Source directory to read from")
+rootCmd.Flags().StringVarP(&Source, "source", "s", "", "Source directory to read from")
 ```
 
 ### Local Flag on Parent Commands
 
-By default Cobra only parses local flags on the target command, any local flags on 
-parent commands are ignored. By enabling `Command.TraverseChildren` Cobra will 
+By default Cobra only parses local flags on the target command, any local flags on
+parent commands are ignored. By enabling `Command.TraverseChildren` Cobra will
 parse local flags on each command before executing the target command.
 
 ```go
@@ -359,8 +362,8 @@ You can also bind your flags with [viper](https://github.com/spf13/viper):
 var author string
 
 func init() {
-  RootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
-  viper.BindPFlag("author", RootCmd.PersistentFlags().Lookup("author"))
+  rootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
+  viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
 }
 ```
 
@@ -370,6 +373,15 @@ when the `--author` flag is not provided by user.
 
 More in [viper documentation](https://github.com/spf13/viper#working-with-flags).
 
+### Required flags
+
+Flags are optional by default. If instead you wish your command to report an error
+when a flag has not been set, mark it as required:
+```go
+rootCmd.Flags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
+rootCmd.MarkFlagRequired("region")
+```
+
 ## Positional and Custom Arguments
 
 Validation of positional arguments can be specified using the `Args` field
@@ -565,6 +577,13 @@ cmd.SetUsageFunc(f func(*Command) error)
 cmd.SetUsageTemplate(s string)
 ```
 
+## Version Flag
+
+Cobra adds a top-level '--version' flag if the Version field is set on the root command.
+Running an application with the '--version' flag will print the version to stdout using
+the version template. The template can be customized using the
+`cmd.SetVersionTemplate(s string)` function.
+
 ## PreRun and PostRun Hooks
 
 It is possible to run functions before or after the main `Run` function of your command. The `PersistentPreRun` and `PreRun` functions will be executed before `Run`. `PersistentPostRun` and `PostRun` will be executed after `Run`.  The `Persistent*Run` functions will be inherited by children if they do not declare their own.  These functions are run in the following order:
diff --git a/vendor/github.com/spf13/cobra/bash_completions.go b/vendor/github.com/spf13/cobra/bash_completions.go
index c19fe7a068b..1d955ac25d6 100644
--- a/vendor/github.com/spf13/cobra/bash_completions.go
+++ b/vendor/github.com/spf13/cobra/bash_completions.go
@@ -21,8 +21,8 @@ const (
 
 func writePreamble(buf *bytes.Buffer, name string) {
 	buf.WriteString(fmt.Sprintf("# bash completion for %-36s -*- shell-script -*-\n", name))
-	buf.WriteString(`
-__debug()
+	buf.WriteString(fmt.Sprintf(`
+__%[1]s_debug()
 {
     if [[ -n ${BASH_COMP_DEBUG_FILE} ]]; then
         echo "$*" >> "${BASH_COMP_DEBUG_FILE}"
@@ -31,13 +31,13 @@ __debug()
 
 # Homebrew on Macs have version 1.3 of bash-completion which doesn't include
 # _init_completion. This is a very minimal version of that function.
-__my_init_completion()
+__%[1]s_init_completion()
 {
     COMPREPLY=()
     _get_comp_words_by_ref "$@" cur prev words cword
 }
 
-__index_of_word()
+__%[1]s_index_of_word()
 {
     local w word=$1
     shift
@@ -49,7 +49,7 @@ __index_of_word()
     index=-1
 }
 
-__contains_word()
+__%[1]s_contains_word()
 {
     local w word=$1; shift
     for w in "$@"; do
@@ -58,9 +58,9 @@ __contains_word()
     return 1
 }
 
-__handle_reply()
+__%[1]s_handle_reply()
 {
-    __debug "${FUNCNAME[0]}"
+    __%[1]s_debug "${FUNCNAME[0]}"
     case $cur in
         -*)
             if [[ $(type -t compopt) = "builtin" ]]; then
@@ -85,7 +85,7 @@ __handle_reply()
 
                 local index flag
                 flag="${cur%%=*}"
-                __index_of_word "${flag}" "${flags_with_completion[@]}"
+                __%[1]s_index_of_word "${flag}" "${flags_with_completion[@]}"
                 COMPREPLY=()
                 if [[ ${index} -ge 0 ]]; then
                     PREFIX=""
@@ -103,7 +103,7 @@ __handle_reply()
 
     # check if we are handling a flag with special work handling
     local index
-    __index_of_word "${prev}" "${flags_with_completion[@]}"
+    __%[1]s_index_of_word "${prev}" "${flags_with_completion[@]}"
     if [[ ${index} -ge 0 ]]; then
         ${flags_completion[${index}]}
         return
@@ -139,21 +139,21 @@ __handle_reply()
 }
 
 # The arguments should be in the form "ext1|ext2|extn"
-__handle_filename_extension_flag()
+__%[1]s_handle_filename_extension_flag()
 {
     local ext="$1"
     _filedir "@(${ext})"
 }
 
-__handle_subdirs_in_dir_flag()
+__%[1]s_handle_subdirs_in_dir_flag()
 {
     local dir="$1"
     pushd "${dir}" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1
 }
 
-__handle_flag()
+__%[1]s_handle_flag()
 {
-    __debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    __%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
 
     # if a command required a flag, and we found it, unset must_have_one_flag()
     local flagname=${words[c]}
@@ -164,27 +164,30 @@ __handle_flag()
         flagname=${flagname%%=*} # strip everything after the =
         flagname="${flagname}=" # but put the = back
     fi
-    __debug "${FUNCNAME[0]}: looking for ${flagname}"
-    if __contains_word "${flagname}" "${must_have_one_flag[@]}"; then
+    __%[1]s_debug "${FUNCNAME[0]}: looking for ${flagname}"
+    if __%[1]s_contains_word "${flagname}" "${must_have_one_flag[@]}"; then
         must_have_one_flag=()
     fi
 
     # if you set a flag which only applies to this command, don't show subcommands
-    if __contains_word "${flagname}" "${local_nonpersistent_flags[@]}"; then
+    if __%[1]s_contains_word "${flagname}" "${local_nonpersistent_flags[@]}"; then
       commands=()
     fi
 
     # keep flag value with flagname as flaghash
-    if [ -n "${flagvalue}" ] ; then
-        flaghash[${flagname}]=${flagvalue}
-    elif [ -n "${words[ $((c+1)) ]}" ] ; then
-        flaghash[${flagname}]=${words[ $((c+1)) ]}
-    else
-        flaghash[${flagname}]="true" # pad "true" for bool flag
+    # flaghash variable is an associative array which is only supported in bash > 3.
+    if [[ -z "${BASH_VERSION}" || "${BASH_VERSINFO[0]}" -gt 3 ]]; then
+        if [ -n "${flagvalue}" ] ; then
+            flaghash[${flagname}]=${flagvalue}
+        elif [ -n "${words[ $((c+1)) ]}" ] ; then
+            flaghash[${flagname}]=${words[ $((c+1)) ]}
+        else
+            flaghash[${flagname}]="true" # pad "true" for bool flag
+        fi
     fi
 
     # skip the argument to a two word flag
-    if __contains_word "${words[c]}" "${two_word_flags[@]}"; then
+    if __%[1]s_contains_word "${words[c]}" "${two_word_flags[@]}"; then
         c=$((c+1))
         # if we are looking for a flags value, don't show commands
         if [[ $c -eq $cword ]]; then
@@ -196,13 +199,13 @@ __handle_flag()
 
 }
 
-__handle_noun()
+__%[1]s_handle_noun()
 {
-    __debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    __%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
 
-    if __contains_word "${words[c]}" "${must_have_one_noun[@]}"; then
+    if __%[1]s_contains_word "${words[c]}" "${must_have_one_noun[@]}"; then
         must_have_one_noun=()
-    elif __contains_word "${words[c]}" "${noun_aliases[@]}"; then
+    elif __%[1]s_contains_word "${words[c]}" "${noun_aliases[@]}"; then
         must_have_one_noun=()
     fi
 
@@ -210,9 +213,9 @@ __handle_noun()
     c=$((c+1))
 }
 
-__handle_command()
+__%[1]s_handle_command()
 {
-    __debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    __%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
 
     local next_command
     if [[ -n ${last_command} ]]; then
@@ -225,30 +228,30 @@ __handle_command()
         fi
     fi
     c=$((c+1))
-    __debug "${FUNCNAME[0]}: looking for ${next_command}"
+    __%[1]s_debug "${FUNCNAME[0]}: looking for ${next_command}"
     declare -F "$next_command" >/dev/null && $next_command
 }
 
-__handle_word()
+__%[1]s_handle_word()
 {
     if [[ $c -ge $cword ]]; then
-        __handle_reply
+        __%[1]s_handle_reply
         return
     fi
-    __debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    __%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
     if [[ "${words[c]}" == -* ]]; then
-        __handle_flag
-    elif __contains_word "${words[c]}" "${commands[@]}"; then
-        __handle_command
-    elif [[ $c -eq 0 ]] && __contains_word "$(basename "${words[c]}")" "${commands[@]}"; then
-        __handle_command
+        __%[1]s_handle_flag
+    elif __%[1]s_contains_word "${words[c]}" "${commands[@]}"; then
+        __%[1]s_handle_command
+    elif [[ $c -eq 0 ]] && __%[1]s_contains_word "$(basename "${words[c]}")" "${commands[@]}"; then
+        __%[1]s_handle_command
     else
-        __handle_noun
+        __%[1]s_handle_noun
     fi
-    __handle_word
+    __%[1]s_handle_word
 }
 
-`)
+`, name))
 }
 
 func writePostscript(buf *bytes.Buffer, name string) {
@@ -260,7 +263,7 @@ func writePostscript(buf *bytes.Buffer, name string) {
     if declare -F _init_completion >/dev/null 2>&1; then
         _init_completion -s || return
     else
-        __my_init_completion -n "=" || return
+        __%[1]s_init_completion -n "=" || return
     fi
 
     local c=0
@@ -269,13 +272,13 @@ func writePostscript(buf *bytes.Buffer, name string) {
     local local_nonpersistent_flags=()
     local flags_with_completion=()
     local flags_completion=()
-    local commands=("%s")
+    local commands=("%[1]s")
     local must_have_one_flag=()
     local must_have_one_noun=()
     local last_command
     local nouns=()
 
-    __handle_word
+    __%[1]s_handle_word
 }
 
 `, name))
@@ -300,7 +303,7 @@ func writeCommands(buf *bytes.Buffer, cmd *Command) {
 	buf.WriteString("\n")
 }
 
-func writeFlagHandler(buf *bytes.Buffer, name string, annotations map[string][]string) {
+func writeFlagHandler(buf *bytes.Buffer, name string, annotations map[string][]string, cmd *Command) {
 	for key, value := range annotations {
 		switch key {
 		case BashCompFilenameExt:
@@ -308,7 +311,7 @@ func writeFlagHandler(buf *bytes.Buffer, name string, annotations map[string][]s
 
 			var ext string
 			if len(value) > 0 {
-				ext = "__handle_filename_extension_flag " + strings.Join(value, "|")
+				ext = fmt.Sprintf("__%s_handle_filename_extension_flag ", cmd.Name()) + strings.Join(value, "|")
 			} else {
 				ext = "_filedir"
 			}
@@ -326,7 +329,7 @@ func writeFlagHandler(buf *bytes.Buffer, name string, annotations map[string][]s
 
 			var ext string
 			if len(value) == 1 {
-				ext = "__handle_subdirs_in_dir_flag " + value[0]
+				ext = fmt.Sprintf("__%s_handle_subdirs_in_dir_flag ", cmd.Name()) + value[0]
 			} else {
 				ext = "_filedir -d"
 			}
@@ -335,7 +338,7 @@ func writeFlagHandler(buf *bytes.Buffer, name string, annotations map[string][]s
 	}
 }
 
-func writeShortFlag(buf *bytes.Buffer, flag *pflag.Flag) {
+func writeShortFlag(buf *bytes.Buffer, flag *pflag.Flag, cmd *Command) {
 	name := flag.Shorthand
 	format := "    "
 	if len(flag.NoOptDefVal) == 0 {
@@ -343,10 +346,10 @@ func writeShortFlag(buf *bytes.Buffer, flag *pflag.Flag) {
 	}
 	format += "flags+=(\"-%s\")\n"
 	buf.WriteString(fmt.Sprintf(format, name))
-	writeFlagHandler(buf, "-"+name, flag.Annotations)
+	writeFlagHandler(buf, "-"+name, flag.Annotations, cmd)
 }
 
-func writeFlag(buf *bytes.Buffer, flag *pflag.Flag) {
+func writeFlag(buf *bytes.Buffer, flag *pflag.Flag, cmd *Command) {
 	name := flag.Name
 	format := "    flags+=(\"--%s"
 	if len(flag.NoOptDefVal) == 0 {
@@ -354,7 +357,7 @@ func writeFlag(buf *bytes.Buffer, flag *pflag.Flag) {
 	}
 	format += "\")\n"
 	buf.WriteString(fmt.Sprintf(format, name))
-	writeFlagHandler(buf, "--"+name, flag.Annotations)
+	writeFlagHandler(buf, "--"+name, flag.Annotations, cmd)
 }
 
 func writeLocalNonPersistentFlag(buf *bytes.Buffer, flag *pflag.Flag) {
@@ -380,9 +383,9 @@ func writeFlags(buf *bytes.Buffer, cmd *Command) {
 		if nonCompletableFlag(flag) {
 			return
 		}
-		writeFlag(buf, flag)
+		writeFlag(buf, flag, cmd)
 		if len(flag.Shorthand) > 0 {
-			writeShortFlag(buf, flag)
+			writeShortFlag(buf, flag, cmd)
 		}
 		if localNonPersistentFlags.Lookup(flag.Name) != nil {
 			writeLocalNonPersistentFlag(buf, flag)
@@ -392,9 +395,9 @@ func writeFlags(buf *bytes.Buffer, cmd *Command) {
 		if nonCompletableFlag(flag) {
 			return
 		}
-		writeFlag(buf, flag)
+		writeFlag(buf, flag, cmd)
 		if len(flag.Shorthand) > 0 {
-			writeShortFlag(buf, flag)
+			writeShortFlag(buf, flag, cmd)
 		}
 	})
 
@@ -491,17 +494,20 @@ func (c *Command) GenBashCompletionFile(filename string) error {
 	return c.GenBashCompletion(outFile)
 }
 
-// MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag, if it exists.
+// MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag if it exists,
+// and causes your command to report an error if invoked without the flag.
 func (c *Command) MarkFlagRequired(name string) error {
 	return MarkFlagRequired(c.Flags(), name)
 }
 
-// MarkPersistentFlagRequired adds the BashCompOneRequiredFlag annotation to the named persistent flag, if it exists.
+// MarkPersistentFlagRequired adds the BashCompOneRequiredFlag annotation to the named persistent flag if it exists,
+// and causes your command to report an error if invoked without the flag.
 func (c *Command) MarkPersistentFlagRequired(name string) error {
 	return MarkFlagRequired(c.PersistentFlags(), name)
 }
 
-// MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag in the flag set, if it exists.
+// MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag if it exists,
+// and causes your command to report an error if invoked without the flag.
 func MarkFlagRequired(flags *pflag.FlagSet, name string) error {
 	return flags.SetAnnotation(name, BashCompOneRequiredFlag, []string{"true"})
 }
diff --git a/vendor/github.com/spf13/cobra/bash_completions.md b/vendor/github.com/spf13/cobra/bash_completions.md
index 52bd39ddb1d..44d777c1822 100644
--- a/vendor/github.com/spf13/cobra/bash_completions.md
+++ b/vendor/github.com/spf13/cobra/bash_completions.md
@@ -173,9 +173,9 @@ hello.yml                     test.json
 
 So while there are many other files in the CWD it only shows me subdirs and those with valid extensions.
 
-# Specifiy custom flag completion
+# Specify custom flag completion
 
-Similar to the filename completion and filtering using cobra.BashCompFilenameExt, you can specifiy
+Similar to the filename completion and filtering using cobra.BashCompFilenameExt, you can specify
 a custom flag completion function with cobra.BashCompCustom:
 
 ```go
diff --git a/vendor/github.com/spf13/cobra/cobra.go b/vendor/github.com/spf13/cobra/cobra.go
index e4b910c5d7a..7010fd15b72 100644
--- a/vendor/github.com/spf13/cobra/cobra.go
+++ b/vendor/github.com/spf13/cobra/cobra.go
@@ -70,7 +70,8 @@ func AddTemplateFuncs(tmplFuncs template.FuncMap) {
 	}
 }
 
-// OnInitialize takes a series of func() arguments and appends them to a slice of func().
+// OnInitialize sets the passed functions to be run when each command's
+// Execute method is called.
 func OnInitialize(y ...func()) {
 	initializers = append(initializers, y...)
 }
diff --git a/vendor/github.com/spf13/cobra/command.go b/vendor/github.com/spf13/cobra/command.go
index eb311a7373a..29675b33632 100644
--- a/vendor/github.com/spf13/cobra/command.go
+++ b/vendor/github.com/spf13/cobra/command.go
@@ -75,6 +75,11 @@ type Command struct {
 	// group commands.
 	Annotations map[string]string
 
+	// Version defines the version for this command. If this value is non-empty and the command does not
+	// define a "version" flag, a "version" boolean flag will be added to the command and, if specified,
+	// will print content of the "Version" variable.
+	Version string
+
 	// The *Run functions are executed in the following order:
 	//   * PersistentPreRun()
 	//   * PreRun()
@@ -142,6 +147,11 @@ type Command struct {
 	commandsMaxNameLen        int
 	// commandsAreSorted defines, if command slice are sorted or not.
 	commandsAreSorted bool
+	// commandCalledAs is the name or alias value used to call this command.
+	commandCalledAs struct {
+		name   string
+		called bool
+	}
 
 	// args is actual args parsed from flags.
 	args []string
@@ -177,6 +187,8 @@ type Command struct {
 	// helpCommand is command with usage 'help'. If it's not defined by user,
 	// cobra uses default help command.
 	helpCommand *Command
+	// versionTemplate is the version template defined by user.
+	versionTemplate string
 }
 
 // SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden
@@ -222,6 +234,11 @@ func (c *Command) SetHelpTemplate(s string) {
 	c.helpTemplate = s
 }
 
+// SetVersionTemplate sets version template to be used. Application can use it to set custom template.
+func (c *Command) SetVersionTemplate(s string) {
+	c.versionTemplate = s
+}
+
 // SetGlobalNormalizationFunc sets a normalization function to all flag sets and also to child commands.
 // The user should not have a cyclic dependency on commands.
 func (c *Command) SetGlobalNormalizationFunc(n func(f *flag.FlagSet, name string) flag.NormalizedName) {
@@ -411,6 +428,19 @@ func (c *Command) HelpTemplate() string {
 {{end}}{{if or .Runnable .HasSubCommands}}{{.UsageString}}{{end}}`
 }
 
+// VersionTemplate return version template for the command.
+func (c *Command) VersionTemplate() string {
+	if c.versionTemplate != "" {
+		return c.versionTemplate
+	}
+
+	if c.HasParent() {
+		return c.parent.VersionTemplate()
+	}
+	return `{{with .Name}}{{printf "%s " .}}{{end}}{{printf "version %s" .Version}}
+`
+}
+
 func hasNoOptDefVal(name string, fs *flag.FlagSet) bool {
 	flag := fs.Lookup(name)
 	if flag == nil {
@@ -532,6 +562,7 @@ func (c *Command) findNext(next string) *Command {
 	matches := make([]*Command, 0)
 	for _, cmd := range c.commands {
 		if cmd.Name() == next || cmd.HasAlias(next) {
+			cmd.commandCalledAs.name = next
 			return cmd
 		}
 		if EnablePrefixMatching && cmd.hasNameOrAliasPrefix(next) {
@@ -542,6 +573,7 @@ func (c *Command) findNext(next string) *Command {
 	if len(matches) == 1 {
 		return matches[0]
 	}
+
 	return nil
 }
 
@@ -640,9 +672,10 @@ func (c *Command) execute(a []string) (err error) {
 		c.Printf("Command %q is deprecated, %s\n", c.Name(), c.Deprecated)
 	}
 
-	// initialize help flag as the last point possible to allow for user
+	// initialize help and version flag at the last point possible to allow for user
 	// overriding
 	c.InitDefaultHelpFlag()
+	c.InitDefaultVersionFlag()
 
 	err = c.ParseFlags(a)
 	if err != nil {
@@ -659,7 +692,27 @@ func (c *Command) execute(a []string) (err error) {
 		return err
 	}
 
-	if helpVal || !c.Runnable() {
+	if helpVal {
+		return flag.ErrHelp
+	}
+
+	// for back-compat, only add version flag behavior if version is defined
+	if c.Version != "" {
+		versionVal, err := c.Flags().GetBool("version")
+		if err != nil {
+			c.Println("\"version\" flag declared as non-bool. Please correct your code")
+			return err
+		}
+		if versionVal {
+			err := tmpl(c.OutOrStdout(), c.VersionTemplate(), c)
+			if err != nil {
+				c.Println(err)
+			}
+			return err
+		}
+	}
+
+	if !c.Runnable() {
 		return flag.ErrHelp
 	}
 
@@ -782,6 +835,11 @@ func (c *Command) ExecuteC() (cmd *Command, err error) {
 		return c, err
 	}
 
+	cmd.commandCalledAs.called = true
+	if cmd.commandCalledAs.name == "" {
+		cmd.commandCalledAs.name = cmd.Name()
+	}
+
 	err = cmd.execute(flags)
 	if err != nil {
 		// Always show help if requested, even if SilenceErrors is in
@@ -848,6 +906,27 @@ func (c *Command) InitDefaultHelpFlag() {
 	}
 }
 
+// InitDefaultVersionFlag adds default version flag to c.
+// It is called automatically by executing the c.
+// If c already has a version flag, it will do nothing.
+// If c.Version is empty, it will do nothing.
+func (c *Command) InitDefaultVersionFlag() {
+	if c.Version == "" {
+		return
+	}
+
+	c.mergePersistentFlags()
+	if c.Flags().Lookup("version") == nil {
+		usage := "version for "
+		if c.Name() == "" {
+			usage += "this command"
+		} else {
+			usage += c.Name()
+		}
+		c.Flags().Bool("version", false, usage)
+	}
+}
+
 // InitDefaultHelpCmd adds default help command to c.
 // It is called automatically by executing the c or by calling help and usage.
 // If c already has help command or c has no subcommands, it will do nothing.
@@ -1068,14 +1147,25 @@ func (c *Command) HasAlias(s string) bool {
 	return false
 }
 
+// CalledAs returns the command name or alias that was used to invoke
+// this command or an empty string if the command has not been called.
+func (c *Command) CalledAs() string {
+	if c.commandCalledAs.called {
+		return c.commandCalledAs.name
+	}
+	return ""
+}
+
 // hasNameOrAliasPrefix returns true if the Name or any of aliases start
 // with prefix
 func (c *Command) hasNameOrAliasPrefix(prefix string) bool {
 	if strings.HasPrefix(c.Name(), prefix) {
+		c.commandCalledAs.name = c.Name()
 		return true
 	}
 	for _, alias := range c.Aliases {
 		if strings.HasPrefix(alias, prefix) {
+			c.commandCalledAs.name = alias
 			return true
 		}
 	}
@@ -1178,7 +1268,7 @@ func (c *Command) HasParent() bool {
 	return c.parent != nil
 }
 
-// GlobalNormalizationFunc returns the global normalization function or nil if doesn't exists.
+// GlobalNormalizationFunc returns the global normalization function or nil if it doesn't exist.
 func (c *Command) GlobalNormalizationFunc() func(f *flag.FlagSet, name string) flag.NormalizedName {
 	return c.globNormFunc
 }
diff --git a/vendor/github.com/spf13/cobra/doc/md_docs.go b/vendor/github.com/spf13/cobra/doc/md_docs.go
index 68cf5bf6487..d7a2c2b6299 100644
--- a/vendor/github.com/spf13/cobra/doc/md_docs.go
+++ b/vendor/github.com/spf13/cobra/doc/md_docs.go
@@ -67,7 +67,7 @@ func GenMarkdownCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string)
 	buf.WriteString("## " + name + "\n\n")
 	buf.WriteString(short + "\n\n")
 	buf.WriteString("### Synopsis\n\n")
-	buf.WriteString("\n" + long + "\n\n")
+	buf.WriteString(long + "\n\n")
 
 	if cmd.Runnable() {
 		buf.WriteString(fmt.Sprintf("```\n%s\n```\n\n", cmd.UseLine()))
@@ -82,7 +82,7 @@ func GenMarkdownCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string)
 		return err
 	}
 	if hasSeeAlso(cmd) {
-		buf.WriteString("### SEE ALSO\n")
+		buf.WriteString("### SEE ALSO\n\n")
 		if cmd.HasParent() {
 			parent := cmd.Parent()
 			pname := parent.CommandPath()