diff --git a/cli/cobra.go b/cli/cobra.go
index 114f1b7d66..ede5b3a11d 100644
--- a/cli/cobra.go
+++ b/cli/cobra.go
@@ -17,6 +17,7 @@ func SetupRootCommand(rootCmd *cobra.Command) {
 	cobra.AddTemplateFunc("operationSubCommands", operationSubCommands)
 	cobra.AddTemplateFunc("managementSubCommands", managementSubCommands)
 	cobra.AddTemplateFunc("wrappedFlagUsages", wrappedFlagUsages)
+	cobra.AddTemplateFunc("useLine", UseLine)
 
 	rootCmd.SetUsageTemplate(usageTemplate)
 	rootCmd.SetHelpTemplate(helpTemplate)
@@ -97,9 +98,19 @@ func managementSubCommands(cmd *cobra.Command) []*cobra.Command {
 	return cmds
 }
 
+// UseLine returns the usage line for a command. This implementation is different
+// from the default Command.UseLine in that it does not add a `[flags]` to the
+// of the line.
+func UseLine(cmd *cobra.Command) string {
+	if cmd.HasParent() {
+		return cmd.Parent().CommandPath() + " " + cmd.Use
+	}
+	return cmd.Use
+}
+
 var usageTemplate = `Usage:
 
-{{- if not .HasSubCommands}}	{{.UseLine}}{{end}}
+{{- if not .HasSubCommands}}	{{ useLine . }}{{end}}
 {{- if .HasSubCommands}}	{{ .CommandPath}} COMMAND{{end}}
 
 {{ .Short | trim }}
diff --git a/cli/command/checkpoint/cmd.go b/cli/command/checkpoint/cmd.go
index 30e9ce364c..097d4dbf90 100644
--- a/cli/command/checkpoint/cmd.go
+++ b/cli/command/checkpoint/cmd.go
@@ -9,11 +9,11 @@ import (
 // NewCheckpointCommand returns the `checkpoint` subcommand (only in experimental)
 func NewCheckpointCommand(dockerCli command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "checkpoint",
-		Short: "Manage checkpoints",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"experimental": "", "version": "1.25"},
+		Use:         "checkpoint",
+		Short:       "Manage checkpoints",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"experimental": "", "version": "1.25"},
 	}
 	cmd.AddCommand(
 		newCreateCommand(dockerCli),
diff --git a/cli/command/config/cmd.go b/cli/command/config/cmd.go
index 1f762596c2..0adadadfac 100644
--- a/cli/command/config/cmd.go
+++ b/cli/command/config/cmd.go
@@ -11,11 +11,11 @@ import (
 // nolint: interfacer
 func NewConfigCommand(dockerCli *command.DockerCli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "config",
-		Short: "Manage Docker configs",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"version": "1.30"},
+		Use:         "config",
+		Short:       "Manage Docker configs",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"version": "1.30"},
 	}
 	cmd.AddCommand(
 		newConfigListCommand(dockerCli),
diff --git a/cli/command/container/opts_test.go b/cli/command/container/opts_test.go
index 0aa043839c..9403898660 100644
--- a/cli/command/container/opts_test.go
+++ b/cli/command/container/opts_test.go
@@ -45,10 +45,7 @@ func TestValidateAttach(t *testing.T) {
 
 // nolint: unparam
 func parseRun(args []string) (*container.Config, *container.HostConfig, *networktypes.NetworkingConfig, error) {
-	flags := pflag.NewFlagSet("run", pflag.ContinueOnError)
-	flags.SetOutput(ioutil.Discard)
-	flags.Usage = nil
-	copts := addFlags(flags)
+	flags, copts := setupRunFlags()
 	if err := flags.Parse(args); err != nil {
 		return nil, nil, nil, err
 	}
@@ -60,6 +57,14 @@ func parseRun(args []string) (*container.Config, *container.HostConfig, *network
 	return containerConfig.Config, containerConfig.HostConfig, containerConfig.NetworkingConfig, err
 }
 
+func setupRunFlags() (*pflag.FlagSet, *containerOptions) {
+	flags := pflag.NewFlagSet("run", pflag.ContinueOnError)
+	flags.SetOutput(ioutil.Discard)
+	flags.Usage = nil
+	copts := addFlags(flags)
+	return flags, copts
+}
+
 func parseMustError(t *testing.T, args string) {
 	_, _, _, err := parseRun(strings.Split(args+" ubuntu bash", " "))
 	assert.Error(t, err, args)
@@ -227,20 +232,21 @@ func TestParseWithMacAddress(t *testing.T) {
 	}
 }
 
-func TestParseWithMemory(t *testing.T) {
-	invalidMemory := "--memory=invalid"
-	_, _, _, err := parseRun([]string{invalidMemory, "img", "cmd"})
-	testutil.ErrorContains(t, err, invalidMemory)
+func TestRunFlagsParseWithMemory(t *testing.T) {
+	flags, _ := setupRunFlags()
+	args := []string{"--memory=invalid", "img", "cmd"}
+	err := flags.Parse(args)
+	testutil.ErrorContains(t, err, `invalid argument "invalid" for "-m, --memory" flag`)
 
 	_, hostconfig := mustParse(t, "--memory=1G")
 	assert.Equal(t, int64(1073741824), hostconfig.Memory)
 }
 
 func TestParseWithMemorySwap(t *testing.T) {
-	invalidMemory := "--memory-swap=invalid"
-
-	_, _, _, err := parseRun([]string{invalidMemory, "img", "cmd"})
-	testutil.ErrorContains(t, err, invalidMemory)
+	flags, _ := setupRunFlags()
+	args := []string{"--memory-swap=invalid", "img", "cmd"}
+	err := flags.Parse(args)
+	testutil.ErrorContains(t, err, `invalid argument "invalid" for "--memory-swap" flag`)
 
 	_, hostconfig := mustParse(t, "--memory-swap=1G")
 	assert.Equal(t, int64(1073741824), hostconfig.MemorySwap)
@@ -365,7 +371,10 @@ func TestParseDevice(t *testing.T) {
 
 func TestParseModes(t *testing.T) {
 	// pid ko
-	_, _, _, err := parseRun([]string{"--pid=container:", "img", "cmd"})
+	flags, copts := setupRunFlags()
+	args := []string{"--pid=container:", "img", "cmd"}
+	require.NoError(t, flags.Parse(args))
+	_, err := parse(flags, copts)
 	testutil.ErrorContains(t, err, "--pid: invalid PID mode")
 
 	// pid ok
@@ -385,14 +394,18 @@ func TestParseModes(t *testing.T) {
 	if !hostconfig.UTSMode.Valid() {
 		t.Fatalf("Expected a valid UTSMode, got %v", hostconfig.UTSMode)
 	}
+}
 
+func TestRunFlagsParseShmSize(t *testing.T) {
 	// shm-size ko
-	expectedErr := `invalid argument "a128m" for --shm-size=a128m: invalid size: 'a128m'`
-	_, _, _, err = parseRun([]string{"--shm-size=a128m", "img", "cmd"})
+	flags, _ := setupRunFlags()
+	args := []string{"--shm-size=a128m", "img", "cmd"}
+	expectedErr := `invalid argument "a128m" for "--shm-size" flag: invalid size: 'a128m'`
+	err := flags.Parse(args)
 	testutil.ErrorContains(t, err, expectedErr)
 
 	// shm-size ok
-	_, hostconfig, _, err = parseRun([]string{"--shm-size=128m", "img", "cmd"})
+	_, hostconfig, _, err := parseRun([]string{"--shm-size=128m", "img", "cmd"})
 	require.NoError(t, err)
 	if hostconfig.ShmSize != 134217728 {
 		t.Fatalf("Expected a valid ShmSize, got %d", hostconfig.ShmSize)
diff --git a/cli/command/container/prune.go b/cli/command/container/prune.go
index f466c44ad0..e144d8d7ea 100644
--- a/cli/command/container/prune.go
+++ b/cli/command/container/prune.go
@@ -35,7 +35,7 @@ func NewPruneCommand(dockerCli command.Cli) *cobra.Command {
 			fmt.Fprintln(dockerCli.Out(), "Total reclaimed space:", units.HumanSize(float64(spaceReclaimed)))
 			return nil
 		},
-		Tags: map[string]string{"version": "1.25"},
+		Annotations: map[string]string{"version": "1.25"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/image/prune.go b/cli/command/image/prune.go
index c49edac277..41590e4ecb 100644
--- a/cli/command/image/prune.go
+++ b/cli/command/image/prune.go
@@ -37,7 +37,7 @@ func NewPruneCommand(dockerCli command.Cli) *cobra.Command {
 			fmt.Fprintln(dockerCli.Out(), "Total reclaimed space:", units.HumanSize(float64(spaceReclaimed)))
 			return nil
 		},
-		Tags: map[string]string{"version": "1.25"},
+		Annotations: map[string]string{"version": "1.25"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/network/prune.go b/cli/command/network/prune.go
index 1b00a5c028..879e2bd554 100644
--- a/cli/command/network/prune.go
+++ b/cli/command/network/prune.go
@@ -33,7 +33,7 @@ func NewPruneCommand(dockerCli command.Cli) *cobra.Command {
 			}
 			return nil
 		},
-		Tags: map[string]string{"version": "1.25"},
+		Annotations: map[string]string{"version": "1.25"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/node/cmd.go b/cli/command/node/cmd.go
index b3090d5d71..4ae0f4f094 100644
--- a/cli/command/node/cmd.go
+++ b/cli/command/node/cmd.go
@@ -14,11 +14,11 @@ import (
 // NewNodeCommand returns a cobra command for `node` subcommands
 func NewNodeCommand(dockerCli command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "node",
-		Short: "Manage Swarm nodes",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"version": "1.24"},
+		Use:         "node",
+		Short:       "Manage Swarm nodes",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"version": "1.24"},
 	}
 	cmd.AddCommand(
 		newDemoteCommand(dockerCli),
diff --git a/cli/command/plugin/cmd.go b/cli/command/plugin/cmd.go
index c298934937..c30f97fd1d 100644
--- a/cli/command/plugin/cmd.go
+++ b/cli/command/plugin/cmd.go
@@ -10,11 +10,11 @@ import (
 // nolint: interfacer
 func NewPluginCommand(dockerCli *command.DockerCli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "plugin",
-		Short: "Manage plugins",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"version": "1.25"},
+		Use:         "plugin",
+		Short:       "Manage plugins",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"version": "1.25"},
 	}
 
 	cmd.AddCommand(
diff --git a/cli/command/plugin/upgrade.go b/cli/command/plugin/upgrade.go
index 0e3f56ff62..f71306c70e 100644
--- a/cli/command/plugin/upgrade.go
+++ b/cli/command/plugin/upgrade.go
@@ -26,7 +26,7 @@ func newUpgradeCommand(dockerCli *command.DockerCli) *cobra.Command {
 			}
 			return runUpgrade(dockerCli, options)
 		},
-		Tags: map[string]string{"version": "1.26"},
+		Annotations: map[string]string{"version": "1.26"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/secret/cmd.go b/cli/command/secret/cmd.go
index 9f8e84345e..55ab054d1b 100644
--- a/cli/command/secret/cmd.go
+++ b/cli/command/secret/cmd.go
@@ -11,11 +11,11 @@ import (
 // nolint: interfacer
 func NewSecretCommand(dockerCli *command.DockerCli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "secret",
-		Short: "Manage Docker secrets",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"version": "1.25"},
+		Use:         "secret",
+		Short:       "Manage Docker secrets",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"version": "1.25"},
 	}
 	cmd.AddCommand(
 		newSecretListCommand(dockerCli),
diff --git a/cli/command/service/cmd.go b/cli/command/service/cmd.go
index 107abf32d0..0f69f28cdc 100644
--- a/cli/command/service/cmd.go
+++ b/cli/command/service/cmd.go
@@ -11,11 +11,11 @@ import (
 // nolint: interfacer
 func NewServiceCommand(dockerCli *command.DockerCli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "service",
-		Short: "Manage services",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"version": "1.24"},
+		Use:         "service",
+		Short:       "Manage services",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"version": "1.24"},
 	}
 	cmd.AddCommand(
 		newCreateCommand(dockerCli),
diff --git a/cli/command/service/logs.go b/cli/command/service/logs.go
index 272c68e9f2..e619d74e16 100644
--- a/cli/command/service/logs.go
+++ b/cli/command/service/logs.go
@@ -48,7 +48,7 @@ func newLogsCommand(dockerCli *command.DockerCli) *cobra.Command {
 			opts.target = args[0]
 			return runLogs(dockerCli, &opts)
 		},
-		Tags: map[string]string{"version": "1.29"},
+		Annotations: map[string]string{"version": "1.29"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/service/rollback.go b/cli/command/service/rollback.go
index 375e6d510a..2196815cd8 100644
--- a/cli/command/service/rollback.go
+++ b/cli/command/service/rollback.go
@@ -21,7 +21,7 @@ func newRollbackCommand(dockerCli command.Cli) *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runRollback(dockerCli, options, args[0])
 		},
-		Tags: map[string]string{"version": "1.31"},
+		Annotations: map[string]string{"version": "1.31"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/service/update_test.go b/cli/command/service/update_test.go
index 69e5fa1b1f..50065e4205 100644
--- a/cli/command/service/update_test.go
+++ b/cli/command/service/update_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/docker/cli/internal/test/testutil"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/container"
 	mounttypes "github.com/docker/docker/api/types/mount"
@@ -165,7 +166,7 @@ func TestUpdateDNSConfig(t *testing.T) {
 	// IPv6
 	flags.Set("dns-add", "2001:db8:abc8::1")
 	// Invalid dns record
-	assert.EqualError(t, flags.Set("dns-add", "x.y.z.w"), "x.y.z.w is not an ip address")
+	testutil.ErrorContains(t, flags.Set("dns-add", "x.y.z.w"), "x.y.z.w is not an ip address")
 
 	// domains with duplicates
 	flags.Set("dns-search-add", "example.com")
@@ -173,7 +174,7 @@ func TestUpdateDNSConfig(t *testing.T) {
 	flags.Set("dns-search-add", "example.org")
 	flags.Set("dns-search-rm", "example.org")
 	// Invalid dns search domain
-	assert.EqualError(t, flags.Set("dns-search-add", "example$com"), "example$com is not a valid domain")
+	testutil.ErrorContains(t, flags.Set("dns-search-add", "example$com"), "example$com is not a valid domain")
 
 	flags.Set("dns-option-add", "ndots:9")
 	flags.Set("dns-option-rm", "timeout:3")
@@ -362,7 +363,7 @@ func TestUpdateHosts(t *testing.T) {
 	// just hostname should work as well
 	flags.Set("host-rm", "example.net")
 	// bad format error
-	assert.EqualError(t, flags.Set("host-add", "$example.com$"), `bad format for add-host: "$example.com$"`)
+	testutil.ErrorContains(t, flags.Set("host-add", "$example.com$"), `bad format for add-host: "$example.com$"`)
 
 	hosts := []string{"1.2.3.4 example.com", "4.3.2.1 example.org", "2001:db8:abc8::1 example.net"}
 
diff --git a/cli/command/stack/cmd.go b/cli/command/stack/cmd.go
index 8d4281cfc6..37d99a902a 100644
--- a/cli/command/stack/cmd.go
+++ b/cli/command/stack/cmd.go
@@ -10,11 +10,11 @@ import (
 // nolint: interfacer
 func NewStackCommand(dockerCli *command.DockerCli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "stack",
-		Short: "Manage Docker stacks",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"version": "1.25"},
+		Use:         "stack",
+		Short:       "Manage Docker stacks",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"version": "1.25"},
 	}
 	cmd.AddCommand(
 		newDeployCommand(dockerCli),
@@ -31,6 +31,6 @@ func NewTopLevelDeployCommand(dockerCli command.Cli) *cobra.Command {
 	cmd := newDeployCommand(dockerCli)
 	// Remove the aliases at the top level
 	cmd.Aliases = []string{}
-	cmd.Tags = map[string]string{"experimental": "", "version": "1.25"}
+	cmd.Annotations = map[string]string{"experimental": "", "version": "1.25"}
 	return cmd
 }
diff --git a/cli/command/swarm/ca.go b/cli/command/swarm/ca.go
index 1c2f2d268b..5535172e59 100644
--- a/cli/command/swarm/ca.go
+++ b/cli/command/swarm/ca.go
@@ -36,7 +36,7 @@ func newCACommand(dockerCli command.Cli) *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runCA(dockerCli, cmd.Flags(), opts)
 		},
-		Tags: map[string]string{"version": "1.30"},
+		Annotations: map[string]string{"version": "1.30"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/swarm/cmd.go b/cli/command/swarm/cmd.go
index d2793f6b91..bea8190a2c 100644
--- a/cli/command/swarm/cmd.go
+++ b/cli/command/swarm/cmd.go
@@ -11,11 +11,11 @@ import (
 // nolint: interfacer
 func NewSwarmCommand(dockerCli command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "swarm",
-		Short: "Manage Swarm",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"version": "1.24"},
+		Use:         "swarm",
+		Short:       "Manage Swarm",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"version": "1.24"},
 	}
 	cmd.AddCommand(
 		newInitCommand(dockerCli),
diff --git a/cli/command/swarm/testdata/update-noargs.golden b/cli/command/swarm/testdata/update-noargs.golden
index 381c0ccf1f..a2ce75897c 100644
--- a/cli/command/swarm/testdata/update-noargs.golden
+++ b/cli/command/swarm/testdata/update-noargs.golden
@@ -8,6 +8,7 @@ Flags:
       --cert-expiry duration            Validity period for node certificates (ns|us|ms|s|m|h) (default 2160h0m0s)
       --dispatcher-heartbeat duration   Dispatcher heartbeat period (ns|us|ms|s|m|h) (default 5s)
       --external-ca external-ca         Specifications of one or more certificate signing endpoints
+  -h, --help                            help for update
       --max-snapshots uint              Number of additional Raft snapshots to retain
       --snapshot-interval uint          Number of log entries between Raft snapshots (default 10000)
       --task-history-limit int          Task history retention limit (default 5)
diff --git a/cli/command/system/df.go b/cli/command/system/df.go
index 5146482f0e..0677801bc3 100644
--- a/cli/command/system/df.go
+++ b/cli/command/system/df.go
@@ -26,7 +26,7 @@ func newDiskUsageCommand(dockerCli *command.DockerCli) *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runDiskUsage(dockerCli, opts)
 		},
-		Tags: map[string]string{"version": "1.25"},
+		Annotations: map[string]string{"version": "1.25"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/system/prune.go b/cli/command/system/prune.go
index d76d995e37..e777501d89 100644
--- a/cli/command/system/prune.go
+++ b/cli/command/system/prune.go
@@ -37,7 +37,7 @@ func newPruneCommand(dockerCli command.Cli) *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runPrune(dockerCli, options)
 		},
-		Tags: map[string]string{"version": "1.25"},
+		Annotations: map[string]string{"version": "1.25"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cli/command/volume/cmd.go b/cli/command/volume/cmd.go
index cf6e61dfb7..b2a552ae35 100644
--- a/cli/command/volume/cmd.go
+++ b/cli/command/volume/cmd.go
@@ -9,11 +9,11 @@ import (
 // NewVolumeCommand returns a cobra command for `volume` subcommands
 func NewVolumeCommand(dockerCli command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "volume COMMAND",
-		Short: "Manage volumes",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
-		Tags:  map[string]string{"version": "1.21"},
+		Use:         "volume COMMAND",
+		Short:       "Manage volumes",
+		Args:        cli.NoArgs,
+		RunE:        command.ShowHelp(dockerCli.Err()),
+		Annotations: map[string]string{"version": "1.21"},
 	}
 	cmd.AddCommand(
 		newCreateCommand(dockerCli),
diff --git a/cli/command/volume/prune.go b/cli/command/volume/prune.go
index abbbff3982..7db81117b8 100644
--- a/cli/command/volume/prune.go
+++ b/cli/command/volume/prune.go
@@ -35,7 +35,7 @@ func NewPruneCommand(dockerCli command.Cli) *cobra.Command {
 			fmt.Fprintln(dockerCli.Out(), "Total reclaimed space:", units.HumanSize(float64(spaceReclaimed)))
 			return nil
 		},
-		Tags: map[string]string{"version": "1.25"},
+		Annotations: map[string]string{"version": "1.25"},
 	}
 
 	flags := cmd.Flags()
diff --git a/cmd/docker/docker.go b/cmd/docker/docker.go
index e6ab2a8bf8..2214a13c3c 100644
--- a/cmd/docker/docker.go
+++ b/cmd/docker/docker.go
@@ -88,6 +88,7 @@ func setFlagErrorFunc(dockerCli *command.DockerCli, cmd *cobra.Command, flags *p
 }
 
 func setHelpFunc(dockerCli *command.DockerCli, cmd *cobra.Command, flags *pflag.FlagSet, opts *cliflags.ClientOptions) {
+	defaultHelpFunc := cmd.HelpFunc()
 	cmd.SetHelpFunc(func(ccmd *cobra.Command, args []string) {
 		initializeDockerCli(dockerCli, flags, opts)
 		if err := isSupported(ccmd, dockerCli); err != nil {
@@ -96,10 +97,7 @@ func setHelpFunc(dockerCli *command.DockerCli, cmd *cobra.Command, flags *pflag.
 		}
 
 		hideUnsupportedFeatures(ccmd, dockerCli)
-
-		if err := ccmd.Help(); err != nil {
-			ccmd.Println(err)
-		}
+		defaultHelpFunc(ccmd, args)
 	})
 }
 
@@ -225,13 +223,13 @@ func hideUnsupportedFeatures(cmd *cobra.Command, details versionDetails) {
 	for _, subcmd := range cmd.Commands() {
 		// hide experimental subcommands
 		if !hasExperimental {
-			if _, ok := subcmd.Tags["experimental"]; ok {
+			if _, ok := subcmd.Annotations["experimental"]; ok {
 				subcmd.Hidden = true
 			}
 		}
 
 		// hide subcommands not supported by the server
-		if subcmdVersion, ok := subcmd.Tags["version"]; ok && versions.LessThan(clientVersion, subcmdVersion) {
+		if subcmdVersion, ok := subcmd.Annotations["version"]; ok && versions.LessThan(clientVersion, subcmdVersion) {
 			subcmd.Hidden = true
 		}
 	}
@@ -244,10 +242,10 @@ func isSupported(cmd *cobra.Command, details versionDetails) error {
 
 	// Check recursively so that, e.g., `docker stack ls` returns the same output as `docker stack`
 	for curr := cmd; curr != nil; curr = curr.Parent() {
-		if cmdVersion, ok := curr.Tags["version"]; ok && versions.LessThan(clientVersion, cmdVersion) {
+		if cmdVersion, ok := curr.Annotations["version"]; ok && versions.LessThan(clientVersion, cmdVersion) {
 			return fmt.Errorf("%s requires API version %s, but the Docker daemon API version is %s", cmd.CommandPath(), cmdVersion, clientVersion)
 		}
-		if _, ok := curr.Tags["experimental"]; ok && !hasExperimental {
+		if _, ok := curr.Annotations["experimental"]; ok && !hasExperimental {
 			return fmt.Errorf("%s is only supported on a Docker daemon with experimental features enabled", cmd.CommandPath())
 		}
 	}
@@ -300,7 +298,7 @@ func isOSTypeSupported(f *pflag.Flag, osType string) bool {
 // hasTags return true if any of the command's parents has tags
 func hasTags(cmd *cobra.Command) bool {
 	for curr := cmd; curr != nil; curr = curr.Parent() {
-		if len(curr.Tags) > 0 {
+		if len(curr.Annotations) > 0 {
 			return true
 		}
 	}
diff --git a/docs/yaml/yaml.go b/docs/yaml/yaml.go
index bea3c14cdc..a92688892d 100644
--- a/docs/yaml/yaml.go
+++ b/docs/yaml/yaml.go
@@ -8,6 +8,7 @@ import (
 	"sort"
 	"strings"
 
+	"github.com/docker/cli/cli"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	yaml "gopkg.in/yaml.v2"
@@ -53,7 +54,7 @@ func GenYamlTree(cmd *cobra.Command, dir string) error {
 // GenYamlTreeCustom creates yaml structured ref files
 func GenYamlTreeCustom(cmd *cobra.Command, dir string, filePrepender func(string) string) error {
 	for _, c := range cmd.Commands() {
-		if !c.IsAvailableCommand() || c.IsHelpCommand() {
+		if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
 			continue
 		}
 		if err := GenYamlTreeCustom(c, dir, filePrepender); err != nil {
@@ -92,7 +93,7 @@ func GenYamlCustom(cmd *cobra.Command, w io.Writer) error {
 	}
 
 	if cmd.Runnable() {
-		cliDoc.Usage = cmd.UseLine()
+		cliDoc.Usage = cli.UseLine(cmd)
 	}
 
 	if len(cmd.Example) > 0 {
@@ -103,10 +104,10 @@ func GenYamlCustom(cmd *cobra.Command, w io.Writer) error {
 	}
 	// Check recursively so that, e.g., `docker stack ls` returns the same output as `docker stack`
 	for curr := cmd; curr != nil; curr = curr.Parent() {
-		if v, ok := curr.Tags["version"]; ok && cliDoc.MinAPIVersion == "" {
+		if v, ok := curr.Annotations["version"]; ok && cliDoc.MinAPIVersion == "" {
 			cliDoc.MinAPIVersion = v
 		}
-		if _, ok := curr.Tags["experimental"]; ok && !cliDoc.Experimental {
+		if _, ok := curr.Annotations["experimental"]; ok && !cliDoc.Experimental {
 			cliDoc.Experimental = true
 		}
 	}
@@ -137,7 +138,7 @@ func GenYamlCustom(cmd *cobra.Command, w io.Writer) error {
 		sort.Sort(byName(children))
 
 		for _, child := range children {
-			if !child.IsAvailableCommand() || child.IsHelpCommand() {
+			if !child.IsAvailableCommand() || child.IsAdditionalHelpTopicCommand() {
 				continue
 			}
 			currentChild := cliDoc.Name + " " + child.Name()
@@ -207,7 +208,7 @@ func hasSeeAlso(cmd *cobra.Command) bool {
 		return true
 	}
 	for _, c := range cmd.Commands() {
-		if !c.IsAvailableCommand() || c.IsHelpCommand() {
+		if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
 			continue
 		}
 		return true
diff --git a/vendor.conf b/vendor.conf
index 80c8fb004b..5dd1e488d2 100755
--- a/vendor.conf
+++ b/vendor.conf
@@ -37,8 +37,8 @@ github.com/pmezard/go-difflib v1.0.0
 github.com/russross/blackfriday 1d6b8e9301e720b08a8938b8c25c018285885438
 github.com/shurcooL/sanitized_anchor_name 10ef21a441db47d8b13ebcc5fd2310f636973c77
 github.com/sirupsen/logrus v1.0.3
-github.com/spf13/cobra v1.5.1 https://github.com/dnephin/cobra.git
-github.com/spf13/pflag 9ff6c6923cfffbcd502984b8e0c80539a94968b7
+github.com/spf13/cobra 7b2c5ac9fc04fc5efafb60700713d4fa609b777b
+github.com/spf13/pflag 97afa5e7ca8a08a383cb259e06636b5e2cc7897f
 github.com/stretchr/testify 4d4bfba8f1d1027c4fdbe371823030df51419987
 github.com/tonistiigi/fsutil dea3a0da73aee887fc02142d995be764106ac5e2
 github.com/xeipuuv/gojsonpointer e0fe6f68307607d540ed8eac07a342c33fa1b54a
diff --git a/vendor/github.com/spf13/cobra/README.md b/vendor/github.com/spf13/cobra/README.md
index 6814a6d483..373a056ba1 100644
--- a/vendor/github.com/spf13/cobra/README.md
+++ b/vendor/github.com/spf13/cobra/README.md
@@ -8,6 +8,7 @@ Many of the most widely used Go projects are built using Cobra including:
 * [Hugo](http://gohugo.io)
 * [rkt](https://github.com/coreos/rkt)
 * [etcd](https://github.com/coreos/etcd)
+* [Moby (former Docker)](https://github.com/moby/moby)
 * [Docker (distribution)](https://github.com/docker/distribution)
 * [OpenShift](https://www.openshift.com/)
 * [Delve](https://github.com/derekparker/delve)
@@ -15,16 +16,36 @@ Many of the most widely used Go projects are built using Cobra including:
 * [CockroachDB](http://www.cockroachlabs.com/)
 * [Bleve](http://www.blevesearch.com/)
 * [ProjectAtomic (enterprise)](http://www.projectatomic.io/)
-* [Parse (CLI)](https://parse.com/)
 * [GiantSwarm's swarm](https://github.com/giantswarm/cli)
 * [Nanobox](https://github.com/nanobox-io/nanobox)/[Nanopack](https://github.com/nanopack)
-
+* [rclone](http://rclone.org/)
+* [nehm](https://github.com/bogem/nehm)
 
 [![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)
-[![GoDoc](https://godoc.org/github.com/spf13/cobra?status.svg)](https://godoc.org/github.com/spf13/cobra) 
+[![GoDoc](https://godoc.org/github.com/spf13/cobra?status.svg)](https://godoc.org/github.com/spf13/cobra)
 
-![cobra](https://cloud.githubusercontent.com/assets/173412/10911369/84832a8e-8212-11e5-9f82-cc96660a4794.gif)
+# Table of Contents
+
+- [Overview](#overview)
+- [Concepts](#concepts)
+  * [Commands](#commands)
+  * [Flags](#flags)
+- [Installing](#installing)
+- [Getting Started](#getting-started)
+  * [Using the Cobra Generator](#using-the-cobra-generator)
+  * [Using the Cobra Library](#using-the-cobra-library)
+  * [Working with Flags](#working-with-flags)
+  * [Positional and Custom Arguments](#positional-and-custom-arguments)
+  * [Example](#example)
+  * [Help Command](#help-command)
+  * [Usage Message](#usage-message)
+  * [PreRun and PostRun Hooks](#prerun-and-postrun-hooks)
+  * [Suggestions when "unknown command" happens](#suggestions-when-unknown-command-happens)
+  * [Generating documentation for your command](#generating-documentation-for-your-command)
+  * [Generating bash completions](#generating-bash-completions)
+- [Contributing](#contributing)
+- [License](#license)
 
 # Overview
 
@@ -39,27 +60,16 @@ Cobra provides:
 * Fully POSIX-compliant flags (including short & long versions)
 * Nested subcommands
 * Global, local and cascading flags
-* Easy generation of applications & commands with `cobra create appname` & `cobra add cmdname`
+* Easy generation of applications & commands with `cobra init appname` & `cobra add cmdname`
 * Intelligent suggestions (`app srver`... did you mean `app server`?)
 * Automatic help generation for commands and flags
-* Automatic detailed help for `app help [command]`
 * Automatic help flag recognition of `-h`, `--help`, etc.
 * Automatically generated bash autocomplete for your application
 * Automatically generated man pages for your application
 * Command aliases so you can change things without breaking them
-* The flexibilty to define your own help, usage, etc.
+* The flexibility to define your own help, usage, etc.
 * Optional tight integration with [viper](http://github.com/spf13/viper) for 12-factor apps
 
-Cobra has an exceptionally clean interface and simple design without needless
-constructors or initialization methods.
-
-Applications built with Cobra commands are designed to be as user-friendly as
-possible. Flags can be placed before or after the command (as long as a
-confusing space isn’t provided). Both short and long flags can be used. A
-command need not even be fully typed.  Help is automatically generated and
-available for the application or for a specific command using either the help
-command or the `--help` flag.
-
 # Concepts
 
 Cobra is built on a structure of commands, arguments & flags.
@@ -78,11 +88,11 @@ A few good real world examples may better illustrate this point.
 
 In the following example, 'server' is a command, and 'port' is a flag:
 
-    > hugo server --port=1313
+    hugo server --port=1313
 
 In this command we are telling Git to clone the url bare.
 
-    > git clone URL --bare
+    git clone URL --bare
 
 ## Commands
 
@@ -92,20 +102,11 @@ have children commands and optionally run an action.
 
 In the example above, 'server' is the command.
 
-A Command has the following structure:
-
-```go
-type Command struct {
-    Use string // The one-line usage message.
-    Short string // The short description shown in the 'help' output.
-    Long string // The long message shown in the 'help <this-command>' output.
-    Run func(cmd *Command, args []string) // Run runs the command.
-}
-```
+[More about cobra.Command](https://godoc.org/github.com/spf13/cobra#Command)
 
 ## Flags
 
-A Flag is a way to modify the behavior of a command. Cobra supports
+A flag is a way to modify the behavior of a command. Cobra supports
 fully POSIX-compliant flags as well as the Go [flag package](https://golang.org/pkg/flag/).
 A Cobra command can define flags that persist through to children commands
 and flags that are only available to that command.
@@ -113,23 +114,15 @@ and flags that are only available to that command.
 In the example above, 'port' is the flag.
 
 Flag functionality is provided by the [pflag
-library](https://github.com/ogier/pflag), a fork of the flag standard library
+library](https://github.com/spf13/pflag), a fork of the flag standard library
 which maintains the same interface while adding POSIX compliance.
 
-## Usage
-
-Cobra works by creating a set of commands and then organizing them into a tree.
-The tree defines the structure of the application.
-
-Once each command is defined with its corresponding flags, then the
-tree is assigned to the commander which is finally executed.
-
 # Installing
 Using Cobra is easy. First, use `go get` to install the latest version
-of the library. This command will install the `cobra` generator executible
-along with the library:
+of the library. This command will install the `cobra` generator executable
+along with the library and its dependencies:
 
-    > go get -v github.com/spf13/cobra/cobra
+    go get -u github.com/spf13/cobra/cobra
 
 Next, include Cobra in your application:
 
@@ -139,8 +132,8 @@ import "github.com/spf13/cobra"
 
 # Getting Started
 
-While you are welcome to provide your own organization, typically a Cobra based
-application will follow the following organizational structure.
+While you are welcome to provide your own organization, typically a Cobra-based
+application will follow the following organizational structure:
 
 ```
   ▾ appName/
@@ -152,18 +145,23 @@ application will follow the following organizational structure.
       main.go
 ```
 
-In a Cobra app, typically the main.go file is very bare. It serves, one purpose, to initialize Cobra.
+In a Cobra app, typically the main.go file is very bare. It serves one purpose: initializing Cobra.
 
 ```go
 package main
 
-import "{pathToYourApp}/cmd"
+import (
+  "fmt"
+  "os"
+
+  "{pathToYourApp}/cmd"
+)
 
 func main() {
-	if err := cmd.RootCmd.Execute(); err != nil {
-		fmt.Println(err)
-		os.Exit(-1)
-	}
+  if err := cmd.RootCmd.Execute(); err != nil {
+    fmt.Println(err)
+    os.Exit(1)
+  }
 }
 ```
 
@@ -172,93 +170,14 @@ func main() {
 Cobra provides its own program that will create your application and add any
 commands you want. It's the easiest way to incorporate Cobra into your application.
 
-### cobra init
+[Here](https://github.com/spf13/cobra/blob/master/cobra/README.md) you can find more information about it.
 
-The `cobra init [yourApp]` command will create your initial application code
-for you. It is a very powerful application that will populate your program with
-the right structure so you can immediately enjoy all the benefits of Cobra. It
-will also automatically apply the license you specify to your application.
+## Using the Cobra Library
 
-Cobra init is pretty smart. You can provide it a full path, or simply a path
-similar to what is expected in the import.
-
-```
-cobra init github.com/spf13/newAppName
-```
-
-### cobra add
-
-Once an application is initialized Cobra can create additional commands for you.
-Let's say you created an app and you wanted the following commands for it:
-
-* app serve
-* app config
-* app config create
-
-In your project directory (where your main.go file is) you would run the following:
-
-```
-cobra add serve
-cobra add config
-cobra add create -p 'configCmd'
-```
-
-Once you have run these three commands you would have an app structure that would look like:
-
-```
-  ▾ app/
-    ▾ cmd/
-        serve.go
-        config.go
-        create.go
-      main.go
-```
-
-at this point you can run `go run main.go` and it would run your app. `go run
-main.go serve`, `go run main.go config`, `go run main.go config create` along
-with `go run main.go help serve`, etc would all work.
-
-Obviously you haven't added your own code to these yet, the commands are ready
-for you to give them their tasks. Have fun.
-
-### Configuring the cobra generator
-
-The cobra generator will be easier to use if you provide a simple configuration
-file which will help you eliminate providing a bunch of repeated information in
-flags over and over.
-
-An example ~/.cobra.yaml file:
-
-```yaml
-author: Steve Francia <spf@spf13.com>
-license: MIT
-```
-
-You can specify no license by setting `license` to `none` or you can specify
-a custom license:
-
-```yaml
-license:
-  header: This file is part of {{ .appName }}.
-  text: |
-    {{ .copyright }}
-
-    This is my license. There are many like it, but this one is mine.
-    My license is my best friend. It is my life. I must master it as I must
-    master my life.  
-```
-
-## Manually implementing Cobra
-
-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 the root command
-
-The root command represents your binary itself.
-
-
-#### Manually create rootCmd
+### Create rootCmd
 
 Cobra doesn't require any special constructors. Simply create your commands.
 
@@ -266,34 +185,71 @@ Ideally you place this in app/cmd/root.go:
 
 ```go
 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
+  Use:   "hugo",
+  Short: "Hugo is a very fast static site generator",
+  Long: `A Fast and Flexible Static Site Generator built with
                 love by spf13 and friends in Go.
                 Complete documentation is available at http://hugo.spf13.com`,
-	Run: func(cmd *cobra.Command, args []string) {
-		// Do Stuff Here
-	},
+  Run: func(cmd *cobra.Command, args []string) {
+    // Do Stuff Here
+  },
 }
 ```
 
 You will additionally define flags and handle configuration in your init() function.
 
-for example cmd/root.go:
+For example cmd/root.go:
 
 ```go
+import (
+  "fmt"
+  "os"
+
+  homedir "github.com/mitchellh/go-homedir"
+  "github.com/spf13/cobra"
+  "github.com/spf13/viper"
+)
+
 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"))
-	viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
-	viper.SetDefault("license", "apache")
+  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"))
+  viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
+  viper.SetDefault("license", "apache")
+}
+
+func Execute() {
+  RootCmd.Execute()
+}
+
+func initConfig() {
+  // Don't forget to read config either from cfgFile or from home directory!
+  if cfgFile != "" {
+    // Use config file from the flag.
+    viper.SetConfigFile(cfgFile)
+  } else {
+    // Find home directory.
+    home, err := homedir.Dir()
+    if err != nil {
+      fmt.Println(err)
+      os.Exit(1)
+    }
+
+    // Search config in home directory with name ".cobra" (without extension).
+    viper.AddConfigPath(home)
+    viper.SetConfigName(".cobra")
+  }
+
+  if err := viper.ReadInConfig(); err != nil {
+    fmt.Println("Can't read config:", err)
+    os.Exit(1)
+  }
 }
 ```
 
@@ -307,17 +263,21 @@ In a Cobra app, typically the main.go file is very bare. It serves, one purpose,
 ```go
 package main
 
-import "{pathToYourApp}/cmd"
+import (
+  "fmt"
+  "os"
+
+  "{pathToYourApp}/cmd"
+)
 
 func main() {
-	if err := cmd.RootCmd.Execute(); err != nil {
-		fmt.Println(err)
-		os.Exit(-1)
-	}
+  if err := cmd.RootCmd.Execute(); err != nil {
+    fmt.Println(err)
+    os.Exit(1)
+  }
 }
 ```
 
-
 ### Create additional commands
 
 Additional commands can be defined and typically are each given their own file
@@ -330,47 +290,24 @@ populate it with the following:
 package cmd
 
 import (
-	"github.com/spf13/cobra"
+  "github.com/spf13/cobra"
+  "fmt"
 )
 
 func init() {
-	RootCmd.AddCommand(versionCmd)
+  RootCmd.AddCommand(versionCmd)
 }
 
 var versionCmd = &cobra.Command{
-	Use:   "version",
-	Short: "Print the version number of Hugo",
-	Long:  `All software has versions. This is Hugo's`,
-	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Println("Hugo Static Site Generator v0.9 -- HEAD")
-	},
+  Use:   "version",
+  Short: "Print the version number of Hugo",
+  Long:  `All software has versions. This is Hugo's`,
+  Run: func(cmd *cobra.Command, args []string) {
+    fmt.Println("Hugo Static Site Generator v0.9 -- HEAD")
+  },
 }
 ```
 
-### Attach command to its parent
-
-
-If you notice in the above example we attach the command to its parent. In
-this case the parent is the rootCmd. In this example we are attaching it to the
-root, but commands can be attached at any level.
-
-```go
-RootCmd.AddCommand(versionCmd)
-```
-
-### Remove a command from its parent
-
-Removing a command is not a common action in simple programs, but it allows 3rd
-parties to customize an existing command tree.
-
-In this example, we remove the existing `VersionCmd` command of an existing
-root command, and we replace it with our own version:
-
-```go
-mainlib.RootCmd.RemoveCommand(mainlib.VersionCmd)
-mainlib.RootCmd.AddCommand(versionCmd)
-```
-
 ## Working with Flags
 
 Flags provide modifiers to control how the action command operates.
@@ -406,40 +343,69 @@ A flag can also be assigned locally which will only apply to that specific comma
 RootCmd.Flags().StringVarP(&Source, "source", "s", "", "Source directory to read from")
 ```
 
-### Positional Arguments
+### Local Flag on Parent Commands
 
-Validation of positional arguments can be specified using the `Args` field, which accepts
-one of the following values:
+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
+command := cobra.Command{
+  Use: "print [OPTIONS] [COMMANDS]",
+  TraverseChildren: true,
+}
+```
+
+### Bind Flags with Config
+
+You can also bind your flags with [viper](https://github.com/spf13/viper):
+```go
+var author string
+
+func init() {
+  RootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
+  viper.BindPFlag("author", RootCmd.PersistentFlags().Lookup("author"))
+}
+```
+
+In this example the persistent flag `author` is bound with `viper`.
+**Note**, that the variable `author` will not be set to the value from config,
+when the `--author` flag is not provided by user.
+
+More in [viper documentation](https://github.com/spf13/viper#working-with-flags).
+
+## Positional and Custom Arguments
+
+Validation of positional arguments can be specified using the `Args` field
+of `Command`.
+
+The following validators are built in:
 
 - `NoArgs` - the command will report an error if there are any positional args.
 - `ArbitraryArgs` - the command will accept any args.
-- `OnlyValidArgs` - the command will report an error if there are any positiona 
-  args that are not in the `ValidArgs` list.
-- `MinimumNArgs(int)` - the command will report an error if there are not at 
-  least N positional args.
-- `MaximumNArgs(int)` - the command will report an error if there are more than 
-  N positional args.
-- `ExactArgs(int)` - the command will report an error if there are not 
-  exactly N positional args.
-- `RangeArgs(min, max)` - the command will report an error if the number of args 
-  is not between the minimum and maximum number of expected args.
-
-By default, `Args` uses the following legacy behaviour:
-- root commands with no subcommands can take arbitrary arguments
-- root commands with subcommands will do subcommand validity checking
-- subcommands will always accept arbitrary arguments and do no subsubcommand validity checking
+- `OnlyValidArgs` - the command will report an error if there are any positional args that are not in the `ValidArgs` field of `Command`.
+- `MinimumNArgs(int)` - the command will report an error if there are not at least N positional args.
+- `MaximumNArgs(int)` - the command will report an error if there are more than N positional args.
+- `ExactArgs(int)` - the command will report an error if there are not exactly N positional args.
+- `RangeArgs(min, max)` - the command will report an error if the number of args is not between the minimum and maximum number of expected args.
 
+An example of setting the custom validator:
 
 ```go
-var HugoCmd = &cobra.Command{
-    Use:   "hugo",
-    Short: "Hugo is a very fast static site generator",
-    ValidArgs: []string{"one", "two"}
-    Args: cobra.OnlyValidArgs
-    Run: func(cmd *cobra.Command, args []string) {
-        // args will only have the values one, two
-        // or the cmd.Execute() will fail.
-    },
+var cmd = &cobra.Command{
+  Short: "hello",
+  Args: func(cmd *cobra.Command, args []string) error {
+    if len(args) < 1 {
+      return errors.New("requires at least one arg")
+    }
+    if myapp.IsValidColor(args[0]) {
+      return nil
+    }
+    return fmt.Errorf("invalid color specified: %s", args[0])
+  },
+  Run: func(cmd *cobra.Command, args []string) {
+    fmt.Println("Hello, World!")
+  },
 }
 ```
 
@@ -458,62 +424,62 @@ More documentation about flags is available at https://github.com/spf13/pflag
 package main
 
 import (
-	"fmt"
-	"strings"
+  "fmt"
+  "strings"
 
-	"github.com/spf13/cobra"
+  "github.com/spf13/cobra"
 )
 
 func main() {
+  var echoTimes int
 
-	var echoTimes int
+  var cmdPrint = &cobra.Command{
+    Use:   "print [string to print]",
+    Short: "Print anything to the screen",
+    Long: `print is for printing anything back to the screen.
+For many years people have printed back to the screen.`,
+    Args: cobra.MinimumNArgs(1),
+    Run: func(cmd *cobra.Command, args []string) {
+      fmt.Println("Print: " + strings.Join(args, " "))
+    },
+  }
 
-	var cmdPrint = &cobra.Command{
-		Use:   "print [string to print]",
-		Short: "Print anything to the screen",
-		Long: `print is for printing anything back to the screen.
-            For many years people have printed back to the screen.
-            `,
-		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Println("Print: " + strings.Join(args, " "))
-		},
-	}
+  var cmdEcho = &cobra.Command{
+    Use:   "echo [string to echo]",
+    Short: "Echo anything to the screen",
+    Long: `echo is for echoing anything back.
+Echo works a lot like print, except it has a child command.`,
+    Args: cobra.MinimumNArgs(1),
+    Run: func(cmd *cobra.Command, args []string) {
+      fmt.Println("Print: " + strings.Join(args, " "))
+    },
+  }
 
-	var cmdEcho = &cobra.Command{
-		Use:   "echo [string to echo]",
-		Short: "Echo anything to the screen",
-		Long: `echo is for echoing anything back.
-            Echo works a lot like print, except it has a child command.
-            `,
-		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Println("Print: " + strings.Join(args, " "))
-		},
-	}
+  var cmdTimes = &cobra.Command{
+    Use:   "times [# times] [string to echo]",
+    Short: "Echo anything to the screen more times",
+    Long: `echo things multiple times back to the user by providing
+a count and a string.`,
+    Args: cobra.MinimumNArgs(1),
+    Run: func(cmd *cobra.Command, args []string) {
+      for i := 0; i < echoTimes; i++ {
+        fmt.Println("Echo: " + strings.Join(args, " "))
+      }
+    },
+  }
 
-	var cmdTimes = &cobra.Command{
-		Use:   "times [# times] [string to echo]",
-		Short: "Echo anything to the screen more times",
-		Long: `echo things multiple times back to the user by providing
-            a count and a string.`,
-		Run: func(cmd *cobra.Command, args []string) {
-			for i := 0; i < echoTimes; i++ {
-				fmt.Println("Echo: " + strings.Join(args, " "))
-			}
-		},
-	}
+  cmdTimes.Flags().IntVarP(&echoTimes, "times", "t", 1, "times to echo the input")
 
-	cmdTimes.Flags().IntVarP(&echoTimes, "times", "t", 1, "times to echo the input")
-
-	var rootCmd = &cobra.Command{Use: "app"}
-	rootCmd.AddCommand(cmdPrint, cmdEcho)
-	cmdEcho.AddCommand(cmdTimes)
-	rootCmd.Execute()
+  var rootCmd = &cobra.Command{Use: "app"}
+  rootCmd.AddCommand(cmdPrint, cmdEcho)
+  cmdEcho.AddCommand(cmdTimes)
+  rootCmd.Execute()
 }
 ```
 
 For a more complete example of a larger application, please checkout [Hugo](http://gohugo.io/).
 
-## The Help Command
+## Help Command
 
 Cobra automatically adds a help command to your application when you have subcommands.
 This will be called when a user runs 'app help'. Additionally, help will also
@@ -526,60 +492,28 @@ create' is called.  Every command will automatically have the '--help' flag adde
 The following output is automatically generated by Cobra. Nothing beyond the
 command and flag definitions are needed.
 
-    > hugo help
+    $ cobra help
 
-    hugo is the main command, used to build your Hugo site.
-
-    Hugo is a Fast and Flexible Static Site Generator
-    built with love by spf13 and friends in Go.
-
-    Complete documentation is available at http://gohugo.io/.
+    Cobra is a CLI library for Go that empowers applications.
+    This application is a tool to generate the needed files
+    to quickly create a Cobra application.
 
     Usage:
-      hugo [flags]
-      hugo [command]
+      cobra [command]
 
     Available Commands:
-      server          Hugo runs its own webserver to render the files
-      version         Print the version number of Hugo
-      config          Print the site configuration
-      check           Check content in the source directory
-      benchmark       Benchmark hugo by building a site a number of times.
-      convert         Convert your content to different formats
-      new             Create new content for your site
-      list            Listing out various types of content
-      undraft         Undraft changes the content's draft status from 'True' to 'False'
-      genautocomplete Generate shell autocompletion script for Hugo
-      gendoc          Generate Markdown documentation for the Hugo CLI.
-      genman          Generate man page for Hugo
-      import          Import your site from others.
+      add         Add a command to a Cobra Application
+      help        Help about any command
+      init        Initialize a Cobra Application
 
     Flags:
-      -b, --baseURL="": hostname (and path) to the root, e.g. http://spf13.com/
-      -D, --buildDrafts[=false]: include content marked as draft
-      -F, --buildFuture[=false]: include content with publishdate in the future
-          --cacheDir="": filesystem path to cache directory. Defaults: $TMPDIR/hugo_cache/
-          --canonifyURLs[=false]: if true, all relative URLs will be canonicalized using baseURL
-          --config="": config file (default is path/config.yaml|json|toml)
-      -d, --destination="": filesystem path to write files to
-          --disableRSS[=false]: Do not build RSS files
-          --disableSitemap[=false]: Do not build Sitemap file
-          --editor="": edit new content with this editor, if provided
-          --ignoreCache[=false]: Ignores the cache directory for reading but still writes to it
-          --log[=false]: Enable Logging
-          --logFile="": Log File path (if set, logging enabled automatically)
-          --noTimes[=false]: Don't sync modification time of files
-          --pluralizeListTitles[=true]: Pluralize titles in lists using inflect
-          --preserveTaxonomyNames[=false]: Preserve taxonomy names as written ("Gérard Depardieu" vs "gerard-depardieu")
-      -s, --source="": filesystem path to read files relative from
-          --stepAnalysis[=false]: display memory and timing of different steps of the program
-      -t, --theme="": theme to use (located in /themes/THEMENAME/)
-          --uglyURLs[=false]: if true, use /filename.html instead of /filename/
-      -v, --verbose[=false]: verbose output
-          --verboseLog[=false]: verbose logging
-      -w, --watch[=false]: watch filesystem for changes and recreate as needed
+      -a, --author string    author name for copyright attribution (default "YOUR NAME")
+          --config string    config file (default is $HOME/.cobra.yaml)
+      -h, --help             help for cobra
+      -l, --license string   name of license for the project
+          --viper            use Viper for configuration (default true)
 
-    Use "hugo [command] --help" for more information about a command.
+    Use "cobra [command] --help" for more information about a command.
 
 
 Help is just a command like any other. There is no special logic or behavior
@@ -587,38 +521,18 @@ around it. In fact, you can provide your own if you want.
 
 ### Defining your own help
 
-You can provide your own Help command or your own template for the default command to use.
-
-The default help command is
+You can provide your own Help command or your own template for the default command to use
+with followind functions:
 
 ```go
-func (c *Command) initHelp() {
-	if c.helpCommand == nil {
-		c.helpCommand = &Command{
-			Use:   "help [command]",
-			Short: "Help about any command",
-			Long: `Help provides help for any command in the application.
-        Simply type ` + c.Name() + ` help [path to command] for full details.`,
-			Run: c.HelpFunc(),
-		}
-	}
-	c.AddCommand(c.helpCommand)
-}
-```
-
-You can provide your own command, function or template through the following methods:
-
-```go
-command.SetHelpCommand(cmd *Command)
-
-command.SetHelpFunc(f func(*Command, []string))
-
-command.SetHelpTemplate(s string)
+cmd.SetHelpCommand(cmd *Command)
+cmd.SetHelpFunc(f func(*Command, []string))
+cmd.SetHelpTemplate(s string)
 ```
 
 The latter two will also apply to any children commands.
 
-## Usage
+## Usage Message
 
 When the user provides an invalid flag or invalid command, Cobra responds by
 showing the user the 'usage'.
@@ -627,73 +541,37 @@ showing the user the 'usage'.
 You may recognize this from the help above. That's because the default help
 embeds the usage as part of its output.
 
+    $ cobra --invalid
+    Error: unknown flag: --invalid
     Usage:
-      hugo [flags]
-      hugo [command]
+      cobra [command]
 
     Available Commands:
-      server          Hugo runs its own webserver to render the files
-      version         Print the version number of Hugo
-      config          Print the site configuration
-      check           Check content in the source directory
-      benchmark       Benchmark hugo by building a site a number of times.
-      convert         Convert your content to different formats
-      new             Create new content for your site
-      list            Listing out various types of content
-      undraft         Undraft changes the content's draft status from 'True' to 'False'
-      genautocomplete Generate shell autocompletion script for Hugo
-      gendoc          Generate Markdown documentation for the Hugo CLI.
-      genman          Generate man page for Hugo
-      import          Import your site from others.
+      add         Add a command to a Cobra Application
+      help        Help about any command
+      init        Initialize a Cobra Application
 
     Flags:
-      -b, --baseURL="": hostname (and path) to the root, e.g. http://spf13.com/
-      -D, --buildDrafts[=false]: include content marked as draft
-      -F, --buildFuture[=false]: include content with publishdate in the future
-          --cacheDir="": filesystem path to cache directory. Defaults: $TMPDIR/hugo_cache/
-          --canonifyURLs[=false]: if true, all relative URLs will be canonicalized using baseURL
-          --config="": config file (default is path/config.yaml|json|toml)
-      -d, --destination="": filesystem path to write files to
-          --disableRSS[=false]: Do not build RSS files
-          --disableSitemap[=false]: Do not build Sitemap file
-          --editor="": edit new content with this editor, if provided
-          --ignoreCache[=false]: Ignores the cache directory for reading but still writes to it
-          --log[=false]: Enable Logging
-          --logFile="": Log File path (if set, logging enabled automatically)
-          --noTimes[=false]: Don't sync modification time of files
-          --pluralizeListTitles[=true]: Pluralize titles in lists using inflect
-          --preserveTaxonomyNames[=false]: Preserve taxonomy names as written ("Gérard Depardieu" vs "gerard-depardieu")
-      -s, --source="": filesystem path to read files relative from
-          --stepAnalysis[=false]: display memory and timing of different steps of the program
-      -t, --theme="": theme to use (located in /themes/THEMENAME/)
-          --uglyURLs[=false]: if true, use /filename.html instead of /filename/
-      -v, --verbose[=false]: verbose output
-          --verboseLog[=false]: verbose logging
-      -w, --watch[=false]: watch filesystem for changes and recreate as needed
+      -a, --author string    author name for copyright attribution (default "YOUR NAME")
+          --config string    config file (default is $HOME/.cobra.yaml)
+      -h, --help             help for cobra
+      -l, --license string   name of license for the project
+          --viper            use Viper for configuration (default true)
+
+    Use "cobra [command] --help" for more information about a command.
 
 ### Defining your own usage
 You can provide your own usage function or template for Cobra to use.
-
-The default usage function is:
-
-```go
-return func(c *Command) error {
-	err := tmpl(c.Out(), c.UsageTemplate(), c)
-	return err
-}
-```
-
 Like help, the function and template are overridable through public methods:
 
 ```go
-command.SetUsageFunc(f func(*Command) error)
-
-command.SetUsageTemplate(s string)
+cmd.SetUsageFunc(f func(*Command) error)
+cmd.SetUsageTemplate(s string)
 ```
 
-## PreRun or PostRun Hooks
+## 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 inherrited by children if they do not declare their own.  These function are run in the following order:
+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:
 
 - `PersistentPreRun`
 - `PreRun`
@@ -707,105 +585,73 @@ An example of two commands which use all of these features is below.  When the s
 package main
 
 import (
-	"fmt"
+  "fmt"
 
-	"github.com/spf13/cobra"
+  "github.com/spf13/cobra"
 )
 
 func main() {
 
-	var rootCmd = &cobra.Command{
-		Use:   "root [sub]",
-		Short: "My root command",
-		PersistentPreRun: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside rootCmd PersistentPreRun with args: %v\n", args)
-		},
-		PreRun: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside rootCmd PreRun with args: %v\n", args)
-		},
-		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside rootCmd Run with args: %v\n", args)
-		},
-		PostRun: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside rootCmd PostRun with args: %v\n", args)
-		},
-		PersistentPostRun: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside rootCmd PersistentPostRun with args: %v\n", args)
-		},
-	}
+  var rootCmd = &cobra.Command{
+    Use:   "root [sub]",
+    Short: "My root command",
+    PersistentPreRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd PersistentPreRun with args: %v\n", args)
+    },
+    PreRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd PreRun with args: %v\n", args)
+    },
+    Run: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd Run with args: %v\n", args)
+    },
+    PostRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd PostRun with args: %v\n", args)
+    },
+    PersistentPostRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd PersistentPostRun with args: %v\n", args)
+    },
+  }
 
-	var subCmd = &cobra.Command{
-		Use:   "sub [no options!]",
-		Short: "My subcommand",
-		PreRun: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside subCmd PreRun with args: %v\n", args)
-		},
-		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside subCmd Run with args: %v\n", args)
-		},
-		PostRun: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside subCmd PostRun with args: %v\n", args)
-		},
-		PersistentPostRun: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Inside subCmd PersistentPostRun with args: %v\n", args)
-		},
-	}
+  var subCmd = &cobra.Command{
+    Use:   "sub [no options!]",
+    Short: "My subcommand",
+    PreRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside subCmd PreRun with args: %v\n", args)
+    },
+    Run: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside subCmd Run with args: %v\n", args)
+    },
+    PostRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside subCmd PostRun with args: %v\n", args)
+    },
+    PersistentPostRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside subCmd PersistentPostRun with args: %v\n", args)
+    },
+  }
 
-	rootCmd.AddCommand(subCmd)
+  rootCmd.AddCommand(subCmd)
 
-	rootCmd.SetArgs([]string{""})
-	_ = rootCmd.Execute()
-	fmt.Print("\n")
-	rootCmd.SetArgs([]string{"sub", "arg1", "arg2"})
-	_ = rootCmd.Execute()
+  rootCmd.SetArgs([]string{""})
+  rootCmd.Execute()
+  fmt.Println()
+  rootCmd.SetArgs([]string{"sub", "arg1", "arg2"})
+  rootCmd.Execute()
 }
 ```
 
+Output:
+```
+Inside rootCmd PersistentPreRun with args: []
+Inside rootCmd PreRun with args: []
+Inside rootCmd Run with args: []
+Inside rootCmd PostRun with args: []
+Inside rootCmd PersistentPostRun with args: []
 
-## Alternative Error Handling
-
-Cobra also has functions where the return signature is an error. This allows for errors to bubble up to the top,
-providing a way to handle the errors in one location. The current list of functions that return an error is:
-
-* PersistentPreRunE
-* PreRunE
-* RunE
-* PostRunE
-* PersistentPostRunE
-
-If you would like to silence the default `error` and `usage` output in favor of your own, you can set `SilenceUsage`
-and `SilenceErrors` to `false` on the command. A child command respects these flags if they are set on the parent
-command.
-
-**Example Usage using RunE:**
-
-```go
-package main
-
-import (
-	"errors"
-	"log"
-
-	"github.com/spf13/cobra"
-)
-
-func main() {
-	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
-                love by spf13 and friends in Go.
-                Complete documentation is available at http://hugo.spf13.com`,
-		RunE: func(cmd *cobra.Command, args []string) error {
-			// Do Stuff Here
-			return errors.New("some random error")
-		},
-	}
-
-	if err := rootCmd.Execute(); err != nil {
-		log.Fatal(err)
-	}
-}
+Inside rootCmd PersistentPreRun with args: [arg1 arg2]
+Inside subCmd PreRun with args: [arg1 arg2]
+Inside subCmd Run with args: [arg1 arg2]
+Inside subCmd PostRun with args: [arg1 arg2]
+Inside subCmd PersistentPostRun with args: [arg1 arg2]
 ```
 
 ## Suggestions when "unknown command" happens
@@ -848,81 +694,28 @@ Did you mean this?
 Run 'kubectl help' for usage.
 ```
 
-## Generating Markdown-formatted documentation for your command
+## Generating documentation for your command
 
-Cobra can generate a Markdown-formatted document based on the subcommands, flags, etc. A simple example of how to do this for your command can be found in [Markdown Docs](doc/md_docs.md).
+Cobra can generate documentation based on subcommands, flags, etc. in the following formats:
 
-## Generating man pages for your command
+- [Markdown](doc/md_docs.md)
+- [ReStructured Text](doc/rest_docs.md)
+- [Man Page](doc/man_docs.md)
 
-Cobra can generate a man page based on the subcommands, flags, etc. A simple example of how to do this for your command can be found in [Man Docs](doc/man_docs.md).
-
-## Generating bash completions for your command
+## Generating bash completions
 
 Cobra can generate a bash-completion file. If you add more information to your command, these completions can be amazingly powerful and flexible.  Read more about it in [Bash Completions](bash_completions.md).
 
-## Debugging
-
-Cobra provides a ‘DebugFlags’ method on a command which, when called, will print
-out everything Cobra knows about the flags for each command.
-
-### Example
-
-```go
-command.DebugFlags()
-```
-
-## Release Notes
-* **0.9.0** June 17, 2014
-  * flags can appears anywhere in the args (provided they are unambiguous)
-  * --help prints usage screen for app or command
-  * Prefix matching for commands
-  * Cleaner looking help and usage output
-  * Extensive test suite
-* **0.8.0** Nov 5, 2013
-  * Reworked interface to remove commander completely
-  * Command now primary structure
-  * No initialization needed
-  * Usage & Help templates & functions definable at any level
-  * Updated Readme
-* **0.7.0** Sept 24, 2013
-  * Needs more eyes
-  * Test suite
-  * Support for automatic error messages
-  * Support for help command
-  * Support for printing to any io.Writer instead of os.Stderr
-  * Support for persistent flags which cascade down tree
-  * Ready for integration into Hugo
-* **0.1.0** Sept 3, 2013
-  * Implement first draft
-
-## Extensions
-
-Libraries for extending Cobra:
-
-* [cmdns](https://github.com/gosuri/cmdns): Enables name spacing a command's immediate children. It provides an alternative way to structure subcommands, similar to `heroku apps:create` and `ovrclk clusters:launch`.
-
-## ToDo
-* Launch proper documentation site
-
-## Contributing
+# Contributing
 
 1. Fork it
-2. Create your feature branch (`git checkout -b my-new-feature`)
-3. Commit your changes (`git commit -am 'Add some feature'`)
-4. Push to the branch (`git push origin my-new-feature`)
-5. Create new Pull Request
+2. Download your fork to your PC (`git clone https://github.com/your_username/cobra && cd cobra`)
+3. Create your feature branch (`git checkout -b my-new-feature`)
+4. Make changes and add them (`git add .`)
+5. Commit your changes (`git commit -m 'Add some feature'`)
+6. Push to the branch (`git push origin my-new-feature`)
+7. Create new pull request
 
-## Contributors
-
-Names in no particular order:
-
-* [spf13](https://github.com/spf13),
-[eparis](https://github.com/eparis),
-[bep](https://github.com/bep), and many more!
-
-## License
+# License
 
 Cobra is released under the Apache 2.0 license. See [LICENSE.txt](https://github.com/spf13/cobra/blob/master/LICENSE.txt)
-
-
-[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/spf13/cobra/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
diff --git a/vendor/github.com/spf13/cobra/args.go b/vendor/github.com/spf13/cobra/args.go
index 639fae7cd0..94a6ca2737 100644
--- a/vendor/github.com/spf13/cobra/args.go
+++ b/vendor/github.com/spf13/cobra/args.go
@@ -77,7 +77,7 @@ func MaximumNArgs(n int) PositionalArgs {
 	}
 }
 
-// ExactArgs returns an error if there are not exactly n args 
+// ExactArgs returns an error if there are not exactly n args
 func ExactArgs(n int) PositionalArgs {
 	return func(cmd *Command, args []string) error {
 		if len(args) != n {
@@ -87,7 +87,7 @@ func ExactArgs(n int) PositionalArgs {
 	}
 }
 
-// RangeArgs returns an error if the number of args is not within the expected range 
+// RangeArgs returns an error if the number of args is not within the expected range
 func RangeArgs(min int, max int) PositionalArgs {
 	return func(cmd *Command, args []string) error {
 		if len(args) < min || len(args) > max {
diff --git a/vendor/github.com/spf13/cobra/bash_completions.go b/vendor/github.com/spf13/cobra/bash_completions.go
index 236dee67f2..c19fe7a068 100644
--- a/vendor/github.com/spf13/cobra/bash_completions.go
+++ b/vendor/github.com/spf13/cobra/bash_completions.go
@@ -1,6 +1,7 @@
 package cobra
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"os"
@@ -10,19 +11,17 @@ import (
 	"github.com/spf13/pflag"
 )
 
+// Annotations for Bash completion.
 const (
-	BashCompFilenameExt     = "cobra_annotation_bash_completion_filename_extentions"
+	BashCompFilenameExt     = "cobra_annotation_bash_completion_filename_extensions"
 	BashCompCustom          = "cobra_annotation_bash_completion_custom"
 	BashCompOneRequiredFlag = "cobra_annotation_bash_completion_one_required_flag"
 	BashCompSubdirsInDir    = "cobra_annotation_bash_completion_subdirs_in_dir"
 )
 
-func preamble(out io.Writer, name string) error {
-	_, err := fmt.Fprintf(out, "# bash completion for %-36s -*- shell-script -*-\n", name)
-	if err != nil {
-		return err
-	}
-	_, err = fmt.Fprint(out, `
+func writePreamble(buf *bytes.Buffer, name string) {
+	buf.WriteString(fmt.Sprintf("# bash completion for %-36s -*- shell-script -*-\n", name))
+	buf.WriteString(`
 __debug()
 {
     if [[ -n ${BASH_COMP_DEBUG_FILE} ]]; then
@@ -87,13 +86,13 @@ __handle_reply()
                 local index flag
                 flag="${cur%%=*}"
                 __index_of_word "${flag}" "${flags_with_completion[@]}"
+                COMPREPLY=()
                 if [[ ${index} -ge 0 ]]; then
-                    COMPREPLY=()
                     PREFIX=""
                     cur="${cur#*=}"
                     ${flags_completion[${index}]}
                     if [ -n "${ZSH_VERSION}" ]; then
-                        # zfs completion needs --flag= prefix
+                        # zsh completion needs --flag= prefix
                         eval "COMPREPLY=( \"\${COMPREPLY[@]/#/${flag}=}\" )"
                     fi
                 fi
@@ -133,7 +132,10 @@ __handle_reply()
         declare -F __custom_func >/dev/null && __custom_func
     fi
 
-    __ltrim_colon_completions "$cur"
+    # available in bash-completion >= 2, not always present on macOS
+    if declare -F __ltrim_colon_completions >/dev/null; then
+        __ltrim_colon_completions "$cur"
+    fi
 }
 
 # The arguments should be in the form "ext1|ext2|extn"
@@ -224,7 +226,7 @@ __handle_command()
     fi
     c=$((c+1))
     __debug "${FUNCNAME[0]}: looking for ${next_command}"
-    declare -F $next_command >/dev/null && $next_command
+    declare -F "$next_command" >/dev/null && $next_command
 }
 
 __handle_word()
@@ -247,16 +249,12 @@ __handle_word()
 }
 
 `)
-	return err
 }
 
-func postscript(w io.Writer, name string) error {
+func writePostscript(buf *bytes.Buffer, name string) {
 	name = strings.Replace(name, ":", "__", -1)
-	_, err := fmt.Fprintf(w, "__start_%s()\n", name)
-	if err != nil {
-		return err
-	}
-	_, err = fmt.Fprintf(w, `{
+	buf.WriteString(fmt.Sprintf("__start_%s()\n", name))
+	buf.WriteString(fmt.Sprintf(`{
     local cur prev words cword
     declare -A flaghash 2>/dev/null || :
     if declare -F _init_completion >/dev/null 2>&1; then
@@ -280,318 +278,227 @@ func postscript(w io.Writer, name string) error {
     __handle_word
 }
 
-`, name)
-	if err != nil {
-		return err
-	}
-	_, err = fmt.Fprintf(w, `if [[ $(type -t compopt) = "builtin" ]]; then
+`, name))
+	buf.WriteString(fmt.Sprintf(`if [[ $(type -t compopt) = "builtin" ]]; then
     complete -o default -F __start_%s %s
 else
     complete -o default -o nospace -F __start_%s %s
 fi
 
-`, name, name, name, name)
-	if err != nil {
-		return err
-	}
-	_, err = fmt.Fprintf(w, "# ex: ts=4 sw=4 et filetype=sh\n")
-	return err
+`, name, name, name, name))
+	buf.WriteString("# ex: ts=4 sw=4 et filetype=sh\n")
 }
 
-func writeCommands(cmd *Command, w io.Writer) error {
-	if _, err := fmt.Fprintf(w, "    commands=()\n"); err != nil {
-		return err
-	}
+func writeCommands(buf *bytes.Buffer, cmd *Command) {
+	buf.WriteString("    commands=()\n")
 	for _, c := range cmd.Commands() {
 		if !c.IsAvailableCommand() || c == cmd.helpCommand {
 			continue
 		}
-		if _, err := fmt.Fprintf(w, "    commands+=(%q)\n", c.Name()); err != nil {
-			return err
-		}
+		buf.WriteString(fmt.Sprintf("    commands+=(%q)\n", c.Name()))
 	}
-	_, err := fmt.Fprintf(w, "\n")
-	return err
+	buf.WriteString("\n")
 }
 
-func writeFlagHandler(name string, annotations map[string][]string, w io.Writer) error {
+func writeFlagHandler(buf *bytes.Buffer, name string, annotations map[string][]string) {
 	for key, value := range annotations {
 		switch key {
 		case BashCompFilenameExt:
-			_, err := fmt.Fprintf(w, "    flags_with_completion+=(%q)\n", name)
-			if err != nil {
-				return err
-			}
+			buf.WriteString(fmt.Sprintf("    flags_with_completion+=(%q)\n", name))
 
+			var ext string
 			if len(value) > 0 {
-				ext := "__handle_filename_extension_flag " + strings.Join(value, "|")
-				_, err = fmt.Fprintf(w, "    flags_completion+=(%q)\n", ext)
+				ext = "__handle_filename_extension_flag " + strings.Join(value, "|")
 			} else {
-				ext := "_filedir"
-				_, err = fmt.Fprintf(w, "    flags_completion+=(%q)\n", ext)
-			}
-			if err != nil {
-				return err
+				ext = "_filedir"
 			}
+			buf.WriteString(fmt.Sprintf("    flags_completion+=(%q)\n", ext))
 		case BashCompCustom:
-			_, err := fmt.Fprintf(w, "    flags_with_completion+=(%q)\n", name)
-			if err != nil {
-				return err
-			}
+			buf.WriteString(fmt.Sprintf("    flags_with_completion+=(%q)\n", name))
 			if len(value) > 0 {
 				handlers := strings.Join(value, "; ")
-				_, err = fmt.Fprintf(w, "    flags_completion+=(%q)\n", handlers)
+				buf.WriteString(fmt.Sprintf("    flags_completion+=(%q)\n", handlers))
 			} else {
-				_, err = fmt.Fprintf(w, "    flags_completion+=(:)\n")
-			}
-			if err != nil {
-				return err
+				buf.WriteString("    flags_completion+=(:)\n")
 			}
 		case BashCompSubdirsInDir:
-			_, err := fmt.Fprintf(w, "    flags_with_completion+=(%q)\n", name)
+			buf.WriteString(fmt.Sprintf("    flags_with_completion+=(%q)\n", name))
 
+			var ext string
 			if len(value) == 1 {
-				ext := "__handle_subdirs_in_dir_flag " + value[0]
-				_, err = fmt.Fprintf(w, "    flags_completion+=(%q)\n", ext)
+				ext = "__handle_subdirs_in_dir_flag " + value[0]
 			} else {
-				ext := "_filedir -d"
-				_, err = fmt.Fprintf(w, "    flags_completion+=(%q)\n", ext)
-			}
-			if err != nil {
-				return err
+				ext = "_filedir -d"
 			}
+			buf.WriteString(fmt.Sprintf("    flags_completion+=(%q)\n", ext))
 		}
 	}
-	return nil
 }
 
-func writeShortFlag(flag *pflag.Flag, w io.Writer) error {
-	b := (len(flag.NoOptDefVal) > 0)
+func writeShortFlag(buf *bytes.Buffer, flag *pflag.Flag) {
 	name := flag.Shorthand
 	format := "    "
-	if !b {
+	if len(flag.NoOptDefVal) == 0 {
 		format += "two_word_"
 	}
 	format += "flags+=(\"-%s\")\n"
-	if _, err := fmt.Fprintf(w, format, name); err != nil {
-		return err
-	}
-	return writeFlagHandler("-"+name, flag.Annotations, w)
+	buf.WriteString(fmt.Sprintf(format, name))
+	writeFlagHandler(buf, "-"+name, flag.Annotations)
 }
 
-func writeFlag(flag *pflag.Flag, w io.Writer) error {
-	b := (len(flag.NoOptDefVal) > 0)
+func writeFlag(buf *bytes.Buffer, flag *pflag.Flag) {
 	name := flag.Name
 	format := "    flags+=(\"--%s"
-	if !b {
+	if len(flag.NoOptDefVal) == 0 {
 		format += "="
 	}
 	format += "\")\n"
-	if _, err := fmt.Fprintf(w, format, name); err != nil {
-		return err
-	}
-	return writeFlagHandler("--"+name, flag.Annotations, w)
+	buf.WriteString(fmt.Sprintf(format, name))
+	writeFlagHandler(buf, "--"+name, flag.Annotations)
 }
 
-func writeLocalNonPersistentFlag(flag *pflag.Flag, w io.Writer) error {
-	b := (len(flag.NoOptDefVal) > 0)
+func writeLocalNonPersistentFlag(buf *bytes.Buffer, flag *pflag.Flag) {
 	name := flag.Name
 	format := "    local_nonpersistent_flags+=(\"--%s"
-	if !b {
+	if len(flag.NoOptDefVal) == 0 {
 		format += "="
 	}
 	format += "\")\n"
-	if _, err := fmt.Fprintf(w, format, name); err != nil {
-		return err
-	}
-	return nil
+	buf.WriteString(fmt.Sprintf(format, name))
 }
 
-func writeFlags(cmd *Command, w io.Writer) error {
-	_, err := fmt.Fprintf(w, `    flags=()
+func writeFlags(buf *bytes.Buffer, cmd *Command) {
+	buf.WriteString(`    flags=()
     two_word_flags=()
     local_nonpersistent_flags=()
     flags_with_completion=()
     flags_completion=()
 
 `)
-	if err != nil {
-		return err
-	}
 	localNonPersistentFlags := cmd.LocalNonPersistentFlags()
-	var visitErr error
 	cmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) {
-		if err := writeFlag(flag, w); err != nil {
-			visitErr = err
+		if nonCompletableFlag(flag) {
 			return
 		}
+		writeFlag(buf, flag)
 		if len(flag.Shorthand) > 0 {
-			if err := writeShortFlag(flag, w); err != nil {
-				visitErr = err
-				return
-			}
+			writeShortFlag(buf, flag)
 		}
 		if localNonPersistentFlags.Lookup(flag.Name) != nil {
-			if err := writeLocalNonPersistentFlag(flag, w); err != nil {
-				visitErr = err
-				return
-			}
+			writeLocalNonPersistentFlag(buf, flag)
 		}
 	})
-	if visitErr != nil {
-		return visitErr
-	}
 	cmd.InheritedFlags().VisitAll(func(flag *pflag.Flag) {
-		if err := writeFlag(flag, w); err != nil {
-			visitErr = err
+		if nonCompletableFlag(flag) {
 			return
 		}
+		writeFlag(buf, flag)
 		if len(flag.Shorthand) > 0 {
-			if err := writeShortFlag(flag, w); err != nil {
-				visitErr = err
-				return
-			}
+			writeShortFlag(buf, flag)
 		}
 	})
-	if visitErr != nil {
-		return visitErr
-	}
 
-	_, err = fmt.Fprintf(w, "\n")
-	return err
+	buf.WriteString("\n")
 }
 
-func writeRequiredFlag(cmd *Command, w io.Writer) error {
-	if _, err := fmt.Fprintf(w, "    must_have_one_flag=()\n"); err != nil {
-		return err
-	}
+func writeRequiredFlag(buf *bytes.Buffer, cmd *Command) {
+	buf.WriteString("    must_have_one_flag=()\n")
 	flags := cmd.NonInheritedFlags()
-	var visitErr error
 	flags.VisitAll(func(flag *pflag.Flag) {
+		if nonCompletableFlag(flag) {
+			return
+		}
 		for key := range flag.Annotations {
 			switch key {
 			case BashCompOneRequiredFlag:
 				format := "    must_have_one_flag+=(\"--%s"
-				b := (flag.Value.Type() == "bool")
-				if !b {
+				if flag.Value.Type() != "bool" {
 					format += "="
 				}
 				format += "\")\n"
-				if _, err := fmt.Fprintf(w, format, flag.Name); err != nil {
-					visitErr = err
-					return
-				}
+				buf.WriteString(fmt.Sprintf(format, flag.Name))
 
 				if len(flag.Shorthand) > 0 {
-					if _, err := fmt.Fprintf(w, "    must_have_one_flag+=(\"-%s\")\n", flag.Shorthand); err != nil {
-						visitErr = err
-						return
-					}
+					buf.WriteString(fmt.Sprintf("    must_have_one_flag+=(\"-%s\")\n", flag.Shorthand))
 				}
 			}
 		}
 	})
-	return visitErr
 }
 
-func writeRequiredNouns(cmd *Command, w io.Writer) error {
-	if _, err := fmt.Fprintf(w, "    must_have_one_noun=()\n"); err != nil {
-		return err
-	}
+func writeRequiredNouns(buf *bytes.Buffer, cmd *Command) {
+	buf.WriteString("    must_have_one_noun=()\n")
 	sort.Sort(sort.StringSlice(cmd.ValidArgs))
 	for _, value := range cmd.ValidArgs {
-		if _, err := fmt.Fprintf(w, "    must_have_one_noun+=(%q)\n", value); err != nil {
-			return err
-		}
+		buf.WriteString(fmt.Sprintf("    must_have_one_noun+=(%q)\n", value))
 	}
-	return nil
 }
 
-func writeArgAliases(cmd *Command, w io.Writer) error {
-	if _, err := fmt.Fprintf(w, "    noun_aliases=()\n"); err != nil {
-		return err
-	}
+func writeArgAliases(buf *bytes.Buffer, cmd *Command) {
+	buf.WriteString("    noun_aliases=()\n")
 	sort.Sort(sort.StringSlice(cmd.ArgAliases))
 	for _, value := range cmd.ArgAliases {
-		if _, err := fmt.Fprintf(w, "    noun_aliases+=(%q)\n", value); err != nil {
-			return err
-		}
+		buf.WriteString(fmt.Sprintf("    noun_aliases+=(%q)\n", value))
 	}
-	return nil
 }
 
-func gen(cmd *Command, w io.Writer) error {
+func gen(buf *bytes.Buffer, cmd *Command) {
 	for _, c := range cmd.Commands() {
 		if !c.IsAvailableCommand() || c == cmd.helpCommand {
 			continue
 		}
-		if err := gen(c, w); err != nil {
-			return err
-		}
+		gen(buf, c)
 	}
 	commandName := cmd.CommandPath()
 	commandName = strings.Replace(commandName, " ", "_", -1)
 	commandName = strings.Replace(commandName, ":", "__", -1)
-	if _, err := fmt.Fprintf(w, "_%s()\n{\n", commandName); err != nil {
-		return err
-	}
-	if _, err := fmt.Fprintf(w, "    last_command=%q\n", commandName); err != nil {
-		return err
-	}
-	if err := writeCommands(cmd, w); err != nil {
-		return err
-	}
-	if err := writeFlags(cmd, w); err != nil {
-		return err
-	}
-	if err := writeRequiredFlag(cmd, w); err != nil {
-		return err
-	}
-	if err := writeRequiredNouns(cmd, w); err != nil {
-		return err
-	}
-	if err := writeArgAliases(cmd, w); err != nil {
-		return err
-	}
-	if _, err := fmt.Fprintf(w, "}\n\n"); err != nil {
-		return err
-	}
-	return nil
+	buf.WriteString(fmt.Sprintf("_%s()\n{\n", commandName))
+	buf.WriteString(fmt.Sprintf("    last_command=%q\n", commandName))
+	writeCommands(buf, cmd)
+	writeFlags(buf, cmd)
+	writeRequiredFlag(buf, cmd)
+	writeRequiredNouns(buf, cmd)
+	writeArgAliases(buf, cmd)
+	buf.WriteString("}\n\n")
 }
 
-func (cmd *Command) GenBashCompletion(w io.Writer) error {
-	if err := preamble(w, cmd.Name()); err != nil {
-		return err
+// GenBashCompletion generates bash completion file and writes to the passed writer.
+func (c *Command) GenBashCompletion(w io.Writer) error {
+	buf := new(bytes.Buffer)
+	writePreamble(buf, c.Name())
+	if len(c.BashCompletionFunction) > 0 {
+		buf.WriteString(c.BashCompletionFunction + "\n")
 	}
-	if len(cmd.BashCompletionFunction) > 0 {
-		if _, err := fmt.Fprintf(w, "%s\n", cmd.BashCompletionFunction); err != nil {
-			return err
-		}
-	}
-	if err := gen(cmd, w); err != nil {
-		return err
-	}
-	return postscript(w, cmd.Name())
+	gen(buf, c)
+	writePostscript(buf, c.Name())
+
+	_, err := buf.WriteTo(w)
+	return err
 }
 
-func (cmd *Command) GenBashCompletionFile(filename string) error {
+func nonCompletableFlag(flag *pflag.Flag) bool {
+	return flag.Hidden || len(flag.Deprecated) > 0
+}
+
+// GenBashCompletionFile generates bash completion file.
+func (c *Command) GenBashCompletionFile(filename string) error {
 	outFile, err := os.Create(filename)
 	if err != nil {
 		return err
 	}
 	defer outFile.Close()
 
-	return cmd.GenBashCompletion(outFile)
+	return c.GenBashCompletion(outFile)
 }
 
 // MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag, if it exists.
-func (cmd *Command) MarkFlagRequired(name string) error {
-	return MarkFlagRequired(cmd.Flags(), name)
+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.
-func (cmd *Command) MarkPersistentFlagRequired(name string) error {
-	return MarkFlagRequired(cmd.PersistentFlags(), name)
+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.
@@ -601,20 +508,20 @@ func MarkFlagRequired(flags *pflag.FlagSet, name string) error {
 
 // MarkFlagFilename adds the BashCompFilenameExt annotation to the named flag, if it exists.
 // Generated bash autocompletion will select filenames for the flag, limiting to named extensions if provided.
-func (cmd *Command) MarkFlagFilename(name string, extensions ...string) error {
-	return MarkFlagFilename(cmd.Flags(), name, extensions...)
+func (c *Command) MarkFlagFilename(name string, extensions ...string) error {
+	return MarkFlagFilename(c.Flags(), name, extensions...)
 }
 
 // MarkFlagCustom adds the BashCompCustom annotation to the named flag, if it exists.
 // Generated bash autocompletion will call the bash function f for the flag.
-func (cmd *Command) MarkFlagCustom(name string, f string) error {
-	return MarkFlagCustom(cmd.Flags(), name, f)
+func (c *Command) MarkFlagCustom(name string, f string) error {
+	return MarkFlagCustom(c.Flags(), name, f)
 }
 
 // MarkPersistentFlagFilename adds the BashCompFilenameExt annotation to the named persistent flag, if it exists.
 // Generated bash autocompletion will select filenames for the flag, limiting to named extensions if provided.
-func (cmd *Command) MarkPersistentFlagFilename(name string, extensions ...string) error {
-	return MarkFlagFilename(cmd.PersistentFlags(), name, extensions...)
+func (c *Command) MarkPersistentFlagFilename(name string, extensions ...string) error {
+	return MarkFlagFilename(c.PersistentFlags(), name, extensions...)
 }
 
 // MarkFlagFilename adds the BashCompFilenameExt annotation to the named flag in the flag set, if it exists.
diff --git a/vendor/github.com/spf13/cobra/cobra.go b/vendor/github.com/spf13/cobra/cobra.go
index 93a2c0f3a7..8928cefc2f 100644
--- a/vendor/github.com/spf13/cobra/cobra.go
+++ b/vendor/github.com/spf13/cobra/cobra.go
@@ -27,48 +27,59 @@ import (
 )
 
 var templateFuncs = template.FuncMap{
-	"trim":               strings.TrimSpace,
-	"trimRightSpace":     trimRightSpace,
-	"appendIfNotPresent": appendIfNotPresent,
-	"rpad":               rpad,
-	"gt":                 Gt,
-	"eq":                 Eq,
+	"trim":                    strings.TrimSpace,
+	"trimRightSpace":          trimRightSpace,
+	"trimTrailingWhitespaces": trimRightSpace,
+	"appendIfNotPresent":      appendIfNotPresent,
+	"rpad":                    rpad,
+	"gt":                      Gt,
+	"eq":                      Eq,
 }
 
 var initializers []func()
 
-// automatic prefix matching can be a dangerous thing to automatically enable in CLI tools.
-// Set this to true to enable it
+// EnablePrefixMatching allows to set automatic prefix matching. Automatic prefix matching can be a dangerous thing
+// to automatically enable in CLI tools.
+// Set this to true to enable it.
 var EnablePrefixMatching = false
 
-//EnableCommandSorting controls sorting of the slice of commands, which is turned on by default.
-//To disable sorting, set it to false.
+// EnableCommandSorting controls sorting of the slice of commands, which is turned on by default.
+// To disable sorting, set it to false.
 var EnableCommandSorting = true
 
-//AddTemplateFunc adds a template function that's available to Usage and Help
-//template generation.
+// MousetrapHelpText enables an information splash screen on Windows
+// if the CLI is started from explorer.exe.
+// To disable the mousetrap, just set this variable to blank string ("").
+// Works only on Microsoft Windows.
+var MousetrapHelpText string = `This is a command line tool.
+
+You need to open cmd.exe and run it from there.
+`
+
+// AddTemplateFunc adds a template function that's available to Usage and Help
+// template generation.
 func AddTemplateFunc(name string, tmplFunc interface{}) {
 	templateFuncs[name] = tmplFunc
 }
 
-//AddTemplateFuncs adds multiple template functions availalble to Usage and
-//Help template generation.
+// AddTemplateFuncs adds multiple template functions that are available to Usage and
+// Help template generation.
 func AddTemplateFuncs(tmplFuncs template.FuncMap) {
 	for k, v := range tmplFuncs {
 		templateFuncs[k] = v
 	}
 }
 
-//OnInitialize takes a series of func() arguments and appends them to a slice of func().
+// OnInitialize takes a series of func() arguments and appends them to a slice of func().
 func OnInitialize(y ...func()) {
-	for _, x := range y {
-		initializers = append(initializers, x)
-	}
+	initializers = append(initializers, y...)
 }
 
-//Gt takes two types and checks whether the first type is greater than the second. In case of types Arrays, Chans,
-//Maps and Slices, Gt will compare their lengths. Ints are compared directly while strings are first parsed as
-//ints and then compared.
+// FIXME Gt is unused by cobra and should be removed in a version 2. It exists only for compatibility with users of cobra.
+
+// Gt takes two types and checks whether the first type is greater than the second. In case of types Arrays, Chans,
+// Maps and Slices, Gt will compare their lengths. Ints are compared directly while strings are first parsed as
+// ints and then compared.
 func Gt(a interface{}, b interface{}) bool {
 	var left, right int64
 	av := reflect.ValueOf(a)
@@ -96,7 +107,9 @@ func Gt(a interface{}, b interface{}) bool {
 	return left > right
 }
 
-//Eq takes two types and checks whether they are equal. Supported types are int and string. Unsupported types will panic.
+// FIXME Eq is unused by cobra and should be removed in a version 2. It exists only for compatibility with users of cobra.
+
+// Eq takes two types and checks whether they are equal. Supported types are int and string. Unsupported types will panic.
 func Eq(a interface{}, b interface{}) bool {
 	av := reflect.ValueOf(a)
 	bv := reflect.ValueOf(b)
@@ -116,7 +129,9 @@ func trimRightSpace(s string) string {
 	return strings.TrimRightFunc(s, unicode.IsSpace)
 }
 
-// appendIfNotPresent will append stringToAppend to the end of s, but only if it's not yet present in s
+// FIXME appendIfNotPresent is unused by cobra and should be removed in a version 2. It exists only for compatibility with users of cobra.
+
+// appendIfNotPresent will append stringToAppend to the end of s, but only if it's not yet present in s.
 func appendIfNotPresent(s, stringToAppend string) string {
 	if strings.Contains(s, stringToAppend) {
 		return s
@@ -124,7 +139,7 @@ func appendIfNotPresent(s, stringToAppend string) string {
 	return s + " " + stringToAppend
 }
 
-//rpad adds padding to the right of a string
+// rpad adds padding to the right of a string.
 func rpad(s string, padding int) string {
 	template := fmt.Sprintf("%%-%ds", padding)
 	return fmt.Sprintf(template, s)
@@ -138,7 +153,7 @@ func tmpl(w io.Writer, text string, data interface{}) error {
 	return t.Execute(w, data)
 }
 
-// ld compares two strings and returns the levenshtein distance between them
+// ld compares two strings and returns the levenshtein distance between them.
 func ld(s, t string, ignoreCase bool) int {
 	if ignoreCase {
 		s = strings.ToLower(s)
diff --git a/vendor/github.com/spf13/cobra/command.go b/vendor/github.com/spf13/cobra/command.go
index 2887208620..58e6ceb077 100644
--- a/vendor/github.com/spf13/cobra/command.go
+++ b/vendor/github.com/spf13/cobra/command.go
@@ -11,8 +11,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//Package cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
-//In addition to providing an interface, Cobra simultaneously provides a controller to organize your application code.
+// Package cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
+// In addition to providing an interface, Cobra simultaneously provides a controller to organize your application code.
 package cobra
 
 import (
@@ -28,172 +28,192 @@ import (
 )
 
 // Command is just that, a command for your application.
-// eg.  'go run' ... 'run' is the command. Cobra requires
+// E.g.  'go run ...' - 'run' is the command. Cobra requires
 // you to define the usage and description as part of your command
 // definition to ensure usability.
 type Command struct {
-	// Name is the command name, usually the executable's name.
-	name string
-	// The one-line usage message.
+	// Use is the one-line usage message.
 	Use string
-	// An array of aliases that can be used instead of the first word in Use.
+
+	// Aliases is an array of aliases that can be used instead of the first word in Use.
 	Aliases []string
-	// An array of command names for which this command will be suggested - similar to aliases but only suggests.
+
+	// SuggestFor is an array of command names for which this command will be suggested -
+	// similar to aliases but only suggests.
 	SuggestFor []string
-	// The short description shown in the 'help' output.
+
+	// Short is the short description shown in the 'help' output.
 	Short string
-	// The long message shown in the 'help <this-command>' output.
+
+	// Long is the long message shown in the 'help <this-command>' output.
 	Long string
-	// Examples of how to use the command
+
+	// Example is examples of how to use the command.
 	Example string
-	// List of all valid non-flag arguments that are accepted in bash completions
+
+	// ValidArgs is list of all valid non-flag arguments that are accepted in bash completions
 	ValidArgs []string
-	// List of aliases for ValidArgs. These are not suggested to the user in the bash
-	// completion, but accepted if entered manually.
-	ArgAliases []string
+
 	// Expected arguments
 	Args PositionalArgs
-	// Custom functions used by the bash autocompletion generator
+
+	// ArgAliases is List of aliases for ValidArgs.
+	// These are not suggested to the user in the bash completion,
+	// but accepted if entered manually.
+	ArgAliases []string
+
+	// BashCompletionFunction is custom functions used by the bash autocompletion generator.
 	BashCompletionFunction string
-	// Is this command deprecated and should print this string when used?
+
+	// Deprecated defines, if this command is deprecated and should print this string when used.
 	Deprecated string
-	// Is this command hidden and should NOT show up in the list of available commands?
+
+	// Hidden defines, if this command is hidden and should NOT show up in the list of available commands.
 	Hidden bool
-	// Tags are key/value pairs that can be used by applications to identify or
-	// group commands
-	Tags map[string]string
-	// Full set of flags
-	flags *flag.FlagSet
-	// Set of flags childrens of this command will inherit
-	pflags *flag.FlagSet
-	// Flags that are declared specifically by this command (not inherited).
-	lflags *flag.FlagSet
-	// SilenceErrors is an option to quiet errors down stream
-	SilenceErrors bool
-	// Silence Usage is an option to silence usage when an error occurs.
-	SilenceUsage bool
+
+	// Annotations are key/value pairs that can be used by applications to identify or
+	// group commands.
+	Annotations map[string]string
+
 	// The *Run functions are executed in the following order:
 	//   * PersistentPreRun()
 	//   * PreRun()
 	//   * Run()
 	//   * PostRun()
 	//   * PersistentPostRun()
-	// All functions get the same args, the arguments after the command name
-	// PersistentPreRun: children of this command will inherit and execute
+	// All functions get the same args, the arguments after the command name.
+	//
+	// PersistentPreRun: children of this command will inherit and execute.
 	PersistentPreRun func(cmd *Command, args []string)
-	// PersistentPreRunE: PersistentPreRun but returns an error
+	// PersistentPreRunE: PersistentPreRun but returns an error.
 	PersistentPreRunE func(cmd *Command, args []string) error
 	// PreRun: children of this command will not inherit.
 	PreRun func(cmd *Command, args []string)
-	// PreRunE: PreRun but returns an error
+	// PreRunE: PreRun but returns an error.
 	PreRunE func(cmd *Command, args []string) error
-	// Run: Typically the actual work function. Most commands will only implement this
+	// Run: Typically the actual work function. Most commands will only implement this.
 	Run func(cmd *Command, args []string)
-	// RunE: Run but returns an error
+	// RunE: Run but returns an error.
 	RunE func(cmd *Command, args []string) error
 	// PostRun: run after the Run command.
 	PostRun func(cmd *Command, args []string)
-	// PostRunE: PostRun but returns an error
+	// PostRunE: PostRun but returns an error.
 	PostRunE func(cmd *Command, args []string) error
-	// PersistentPostRun: children of this command will inherit and execute after PostRun
+	// PersistentPostRun: children of this command will inherit and execute after PostRun.
 	PersistentPostRun func(cmd *Command, args []string)
-	// PersistentPostRunE: PersistentPostRun but returns an error
+	// PersistentPostRunE: PersistentPostRun but returns an error.
 	PersistentPostRunE func(cmd *Command, args []string) error
-	// DisableAutoGenTag remove
+
+	// SilenceErrors is an option to quiet errors down stream.
+	SilenceErrors bool
+
+	// SilenceUsage is an option to silence usage when an error occurs.
+	SilenceUsage bool
+
+	// DisableFlagParsing disables the flag parsing.
+	// If this is true all flags will be passed to the command as arguments.
+	DisableFlagParsing bool
+
+	// DisableAutoGenTag defines, if gen tag ("Auto generated by spf13/cobra...")
+	// will be printed by generating docs for this command.
 	DisableAutoGenTag bool
-	// Commands is the list of commands supported by this program.
+
+	// DisableSuggestions disables the suggestions based on Levenshtein distance
+	// that go along with 'unknown command' messages.
+	DisableSuggestions bool
+	// SuggestionsMinimumDistance defines minimum levenshtein distance to display suggestions.
+	// Must be > 0.
+	SuggestionsMinimumDistance int
+
+	// TraverseChildren parses flags on all parents before executing child command.
+	TraverseChildren bool
+
+	// commands is the list of commands supported by this program.
 	commands []*Command
-	// Parent Command for this command
+	// parent is a parent command for this command.
 	parent *Command
-	// max lengths of commands' string lengths for use in padding
+	// Max lengths of commands' string lengths for use in padding.
 	commandsMaxUseLen         int
 	commandsMaxCommandPathLen int
 	commandsMaxNameLen        int
-	// is commands slice are sorted or not
+	// commandsAreSorted defines, if command slice are sorted or not.
 	commandsAreSorted bool
 
+	// args is actual args parsed from flags.
+	args []string
+	// flagErrorBuf contains all error messages from pflag.
 	flagErrorBuf *bytes.Buffer
-
-	args          []string             // actual args parsed from flags
-	output        *io.Writer           // nil means stderr; use Out() method instead
-	usageFunc     func(*Command) error // Usage can be defined by application
-	usageTemplate string               // Can be defined by Application
-	flagErrorFunc func(*Command, error) error
-	helpTemplate  string                   // Can be defined by Application
-	helpFunc      func(*Command, []string) // Help can be defined by application
-	helpCommand   *Command                 // The help command
-	// The global normalization function that we can use on every pFlag set and children commands
+	// flags is full set of flags.
+	flags *flag.FlagSet
+	// pflags contains persistent flags.
+	pflags *flag.FlagSet
+	// lflags contains local flags.
+	lflags *flag.FlagSet
+	// iflags contains inherited flags.
+	iflags *flag.FlagSet
+	// parentsPflags is all persistent flags of cmd's parents.
+	parentsPflags *flag.FlagSet
+	// globNormFunc is the global normalization function
+	// that we can use on every pflag set and children commands
 	globNormFunc func(f *flag.FlagSet, name string) flag.NormalizedName
 
-	// Disable the suggestions based on Levenshtein distance that go along with 'unknown command' messages
-	DisableSuggestions bool
-	// If displaying suggestions, allows to set the minimum levenshtein distance to display, must be > 0
-	SuggestionsMinimumDistance int
-
-	// Disable the flag parsing. If this is true all flags will be passed to the command as arguments.
-	DisableFlagParsing bool
-
-	// TraverseChildren parses flags on all parents before executing child command
-	TraverseChildren bool
+	// output is an output writer defined by user.
+	output io.Writer
+	// usageFunc is usage func defined by user.
+	usageFunc func(*Command) error
+	// usageTemplate is usage template defined by user.
+	usageTemplate string
+	// flagErrorFunc is func defined by user and it's called when the parsing of
+	// flags returns an error.
+	flagErrorFunc func(*Command, error) error
+	// helpTemplate is help template defined by user.
+	helpTemplate string
+	// helpFunc is help func defined by user.
+	helpFunc func(*Command, []string)
+	// helpCommand is command with usage 'help'. If it's not defined by user,
+	// cobra uses default help command.
+	helpCommand *Command
 }
 
-// os.Args[1:] by default, if desired, can be overridden
+// SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden
 // particularly useful when testing.
 func (c *Command) SetArgs(a []string) {
 	c.args = a
 }
 
-func (c *Command) getOut(def io.Writer) io.Writer {
-	if c.output != nil {
-		return *c.output
-	}
-
-	if c.HasParent() {
-		return c.parent.Out()
-	}
-	return def
-}
-
-func (c *Command) Out() io.Writer {
-	return c.getOut(os.Stderr)
-}
-
-func (c *Command) getOutOrStdout() io.Writer {
-	return c.getOut(os.Stdout)
-}
-
 // SetOutput sets the destination for usage and error messages.
 // If output is nil, os.Stderr is used.
 func (c *Command) SetOutput(output io.Writer) {
-	c.output = &output
+	c.output = output
 }
 
-// Usage can be defined by application
+// SetUsageFunc sets usage function. Usage can be defined by application.
 func (c *Command) SetUsageFunc(f func(*Command) error) {
 	c.usageFunc = f
 }
 
-// Can be defined by Application
+// SetUsageTemplate sets usage template. Can be defined by Application.
 func (c *Command) SetUsageTemplate(s string) {
 	c.usageTemplate = s
 }
 
 // SetFlagErrorFunc sets a function to generate an error when flag parsing
-// fails
+// fails.
 func (c *Command) SetFlagErrorFunc(f func(*Command, error) error) {
 	c.flagErrorFunc = f
 }
 
-// Can be defined by Application
+// SetHelpFunc sets help function. Can be defined by Application.
 func (c *Command) SetHelpFunc(f func(*Command, []string)) {
 	c.helpFunc = f
 }
 
+// SetHelpCommand sets help command.
 func (c *Command) SetHelpCommand(cmd *Command) {
 	c.helpCommand = cmd
 }
 
-// Can be defined by Application
+// SetHelpTemplate sets help template to be used. Application can use it to set custom template.
 func (c *Command) SetHelpTemplate(s string) {
 	c.helpTemplate = s
 }
@@ -210,41 +230,88 @@ func (c *Command) SetGlobalNormalizationFunc(n func(f *flag.FlagSet, name string
 	}
 }
 
+// OutOrStdout returns output to stdout.
+func (c *Command) OutOrStdout() io.Writer {
+	return c.getOut(os.Stdout)
+}
+
+// OutOrStderr returns output to stderr
+func (c *Command) OutOrStderr() io.Writer {
+	return c.getOut(os.Stderr)
+}
+
+func (c *Command) getOut(def io.Writer) io.Writer {
+	if c.output != nil {
+		return c.output
+	}
+	if c.HasParent() {
+		return c.parent.getOut(def)
+	}
+	return def
+}
+
+// UsageFunc returns either the function set by SetUsageFunc for this command
+// or a parent, or it returns a default usage function.
 func (c *Command) UsageFunc() (f func(*Command) error) {
 	if c.usageFunc != nil {
 		return c.usageFunc
 	}
-
 	if c.HasParent() {
-		return c.parent.UsageFunc()
+		return c.Parent().UsageFunc()
 	}
 	return func(c *Command) error {
-		err := tmpl(c.Out(), c.UsageTemplate(), c)
+		c.mergePersistentFlags()
+		err := tmpl(c.OutOrStderr(), c.UsageTemplate(), c)
 		if err != nil {
-			fmt.Print(err)
+			c.Println(err)
 		}
 		return err
 	}
 }
 
+// Usage puts out the usage for the command.
+// Used when a user provides invalid input.
+// Can be defined by user by overriding UsageFunc.
+func (c *Command) Usage() error {
+	return c.UsageFunc()(c)
+}
+
 // HelpFunc returns either the function set by SetHelpFunc for this command
-// or a parent, or it returns a function which calls c.Help()
+// or a parent, or it returns a function with default help behavior.
 func (c *Command) HelpFunc() func(*Command, []string) {
-	cmd := c
-	for cmd != nil {
-		if cmd.helpFunc != nil {
-			return cmd.helpFunc
-		}
-		cmd = cmd.parent
+	if c.helpFunc != nil {
+		return c.helpFunc
 	}
-	return func(*Command, []string) {
-		err := c.Help()
+	if c.HasParent() {
+		return c.Parent().HelpFunc()
+	}
+	return func(c *Command, a []string) {
+		c.mergePersistentFlags()
+		err := tmpl(c.OutOrStdout(), c.HelpTemplate(), c)
 		if err != nil {
 			c.Println(err)
 		}
 	}
 }
 
+// Help puts out the help for the command.
+// Used when a user calls help [command].
+// Can be defined by user by overriding HelpFunc.
+func (c *Command) Help() error {
+	c.HelpFunc()(c, []string{})
+	return nil
+}
+
+// UsageString return usage string.
+func (c *Command) UsageString() string {
+	tmpOutput := c.output
+	bb := new(bytes.Buffer)
+	c.SetOutput(bb)
+	c.Usage()
+	c.output = tmpOutput
+	return bb.String()
+}
+
 // FlagErrorFunc returns either the function set by SetFlagErrorFunc for this
 // command or a parent, or it returns a function which returns the original
 // error.
@@ -263,6 +330,7 @@ func (c *Command) FlagErrorFunc() (f func(*Command, error) error) {
 
 var minUsagePadding = 25
 
+// UsagePadding return padding for the usage.
 func (c *Command) UsagePadding() int {
 	if c.parent == nil || minUsagePadding > c.parent.commandsMaxUseLen {
 		return minUsagePadding
@@ -272,7 +340,7 @@ func (c *Command) UsagePadding() int {
 
 var minCommandPathPadding = 11
 
-//
+// CommandPathPadding return padding for the command path.
 func (c *Command) CommandPathPadding() int {
 	if c.parent == nil || minCommandPathPadding > c.parent.commandsMaxCommandPathLen {
 		return minCommandPathPadding
@@ -282,6 +350,7 @@ func (c *Command) CommandPathPadding() int {
 
 var minNamePadding = 11
 
+// NamePadding returns padding for the name.
 func (c *Command) NamePadding() int {
 	if c.parent == nil || minNamePadding > c.parent.commandsMaxNameLen {
 		return minNamePadding
@@ -289,6 +358,7 @@ func (c *Command) NamePadding() int {
 	return c.parent.commandsMaxNameLen
 }
 
+// UsageTemplate returns usage template for the command.
 func (c *Command) UsageTemplate() string {
 	if c.usageTemplate != "" {
 		return c.usageTemplate
@@ -298,32 +368,32 @@ func (c *Command) UsageTemplate() string {
 		return c.parent.UsageTemplate()
 	}
 	return `Usage:{{if .Runnable}}
-  {{if .HasAvailableFlags}}{{appendIfNotPresent .UseLine "[flags]"}}{{else}}{{.UseLine}}{{end}}{{end}}{{if .HasAvailableSubCommands}}
-  {{ .CommandPath}} [command]{{end}}{{if gt .Aliases 0}}
+  {{.UseLine}}{{end}}{{if .HasAvailableSubCommands}}
+  {{.CommandPath}} [command]{{end}}{{if gt (len .Aliases) 0}}
 
 Aliases:
-  {{.NameAndAliases}}
-{{end}}{{if .HasExample}}
+  {{.NameAndAliases}}{{end}}{{if .HasExample}}
 
 Examples:
-{{ .Example }}{{end}}{{ if .HasAvailableSubCommands}}
+{{.Example}}{{end}}{{if .HasAvailableSubCommands}}
 
-Available Commands:{{range .Commands}}{{if .IsAvailableCommand}}
-  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasAvailableLocalFlags}}
+Available Commands:{{range .Commands}}{{if (or .IsAvailableCommand (eq .Name "help"))}}
+  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableLocalFlags}}
 
 Flags:
-{{.LocalFlags.FlagUsages | trimRightSpace}}{{end}}{{ if .HasAvailableInheritedFlags}}
+{{.LocalFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasAvailableInheritedFlags}}
 
 Global Flags:
-{{.InheritedFlags.FlagUsages | trimRightSpace}}{{end}}{{if .HasHelpSubCommands}}
+{{.InheritedFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasHelpSubCommands}}
 
-Additional help topics:{{range .Commands}}{{if .IsHelpCommand}}
-  {{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasAvailableSubCommands }}
+Additional help topics:{{range .Commands}}{{if .IsAdditionalHelpTopicCommand}}
+  {{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableSubCommands}}
 
 Use "{{.CommandPath}} [command] --help" for more information about a command.{{end}}
 `
 }
 
+// HelpTemplate return help template for the command.
 func (c *Command) HelpTemplate() string {
 	if c.helpTemplate != "" {
 		return c.helpTemplate
@@ -332,72 +402,60 @@ func (c *Command) HelpTemplate() string {
 	if c.HasParent() {
 		return c.parent.HelpTemplate()
 	}
-	return `{{with or .Long .Short }}{{. | trim}}
+	return `{{with (or .Long .Short)}}{{. | trimTrailingWhitespaces}}
 
 {{end}}{{if or .Runnable .HasSubCommands}}{{.UsageString}}{{end}}`
 }
 
-// Really only used when casting a command to a commander
-func (c *Command) resetChildrensParents() {
-	for _, x := range c.commands {
-		x.parent = c
-	}
-}
-
-// Test if the named flag is a boolean flag.
-func isBooleanFlag(name string, f *flag.FlagSet) bool {
-	flag := f.Lookup(name)
+func hasNoOptDefVal(name string, fs *flag.FlagSet) bool {
+	flag := fs.Lookup(name)
 	if flag == nil {
 		return false
 	}
-	return flag.Value.Type() == "bool"
+	return flag.NoOptDefVal != ""
 }
 
-// Test if the named flag is a boolean flag.
-func isBooleanShortFlag(name string, f *flag.FlagSet) bool {
-	result := false
-	f.VisitAll(func(f *flag.Flag) {
-		if f.Shorthand == name && f.Value.Type() == "bool" {
-			result = true
-		}
-	})
-	return result
+func shortHasNoOptDefVal(name string, fs *flag.FlagSet) bool {
+	if len(name) == 0 {
+		return false
+	}
+
+	flag := fs.ShorthandLookup(name[:1])
+	if flag == nil {
+		return false
+	}
+	return flag.NoOptDefVal != ""
 }
 
 func stripFlags(args []string, c *Command) []string {
-	if len(args) < 1 {
+	if len(args) == 0 {
 		return args
 	}
 	c.mergePersistentFlags()
 
 	commands := []string{}
+	flags := c.Flags()
 
-	inQuote := false
-	inFlag := false
-	for _, y := range args {
-		if !inQuote {
-			switch {
-			case strings.HasPrefix(y, "\""):
-				inQuote = true
-			case strings.Contains(y, "=\""):
-				inQuote = true
-			case strings.HasPrefix(y, "--") && !strings.Contains(y, "="):
-				// TODO: this isn't quite right, we should really check ahead for 'true' or 'false'
-				inFlag = !isBooleanFlag(y[2:], c.Flags())
-			case strings.HasPrefix(y, "-") && !strings.Contains(y, "=") && len(y) == 2 && !isBooleanShortFlag(y[1:], c.Flags()):
-				inFlag = true
-			case inFlag:
-				inFlag = false
-			case y == "":
-				// strip empty commands, as the go tests expect this to be ok....
-			case !strings.HasPrefix(y, "-"):
-				commands = append(commands, y)
-				inFlag = false
+Loop:
+	for len(args) > 0 {
+		s := args[0]
+		args = args[1:]
+		switch {
+		case strings.HasPrefix(s, "--") && !strings.Contains(s, "=") && !hasNoOptDefVal(s[2:], flags):
+			// If '--flag arg' then
+			// delete arg from args.
+			fallthrough // (do the same as below)
+		case strings.HasPrefix(s, "-") && !strings.Contains(s, "=") && len(s) == 2 && !shortHasNoOptDefVal(s[1:], flags):
+			// If '-f arg' then
+			// delete 'arg' from args or break the loop if len(args) <= 1.
+			if len(args) <= 1 {
+				break Loop
+			} else {
+				args = args[1:]
+				continue
 			}
-		}
-
-		if strings.HasSuffix(y, "\"") && !strings.HasSuffix(y, "\\\"") {
-			inQuote = false
+		case s != "" && !strings.HasPrefix(s, "-"):
+			commands = append(commands, s)
 		}
 	}
 
@@ -449,13 +507,30 @@ func (c *Command) Find(args []string) (*Command, []string, error) {
 	return commandFound, a, nil
 }
 
+func (c *Command) findSuggestions(arg string) string {
+	if c.DisableSuggestions {
+		return ""
+	}
+	if c.SuggestionsMinimumDistance <= 0 {
+		c.SuggestionsMinimumDistance = 2
+	}
+	suggestionsString := ""
+	if suggestions := c.SuggestionsFor(arg); len(suggestions) > 0 {
+		suggestionsString += "\n\nDid you mean this?\n"
+		for _, s := range suggestions {
+			suggestionsString += fmt.Sprintf("\t%v\n", s)
+		}
+	}
+	return suggestionsString
+}
+
 func (c *Command) findNext(next string) *Command {
 	matches := make([]*Command, 0)
 	for _, cmd := range c.commands {
 		if cmd.Name() == next || cmd.HasAlias(next) {
 			return cmd
 		}
-		if EnablePrefixMatching && cmd.HasNameOrAliasPrefix(next) {
+		if EnablePrefixMatching && cmd.hasNameOrAliasPrefix(next) {
 			matches = append(matches, cmd)
 		}
 	}
@@ -477,11 +552,11 @@ func (c *Command) Traverse(args []string) (*Command, []string, error) {
 		// A long flag with a space separated value
 		case strings.HasPrefix(arg, "--") && !strings.Contains(arg, "="):
 			// TODO: this isn't quite right, we should really check ahead for 'true' or 'false'
-			inFlag = !isBooleanFlag(arg[2:], c.Flags())
+			inFlag = !hasNoOptDefVal(arg[2:], c.Flags())
 			flags = append(flags, arg)
 			continue
 		// A short flag with a space separated value
-		case strings.HasPrefix(arg, "-") && !strings.Contains(arg, "=") && len(arg) == 2 && !isBooleanShortFlag(arg[1:], c.Flags()):
+		case strings.HasPrefix(arg, "-") && !strings.Contains(arg, "=") && len(arg) == 2 && !shortHasNoOptDefVal(arg[1:], c.Flags()):
 			inFlag = true
 			flags = append(flags, arg)
 			continue
@@ -509,23 +584,7 @@ func (c *Command) Traverse(args []string) (*Command, []string, error) {
 	return c, args, nil
 }
 
-func (c *Command) findSuggestions(arg string) string {
-	if c.DisableSuggestions {
-		return ""
-	}
-	if c.SuggestionsMinimumDistance <= 0 {
-		c.SuggestionsMinimumDistance = 2
-	}
-	suggestionsString := ""
-	if suggestions := c.SuggestionsFor(arg); len(suggestions) > 0 {
-		suggestionsString += "\n\nDid you mean this?\n"
-		for _, s := range suggestions {
-			suggestionsString += fmt.Sprintf("\t%v\n", s)
-		}
-	}
-	return suggestionsString
-}
-
+// SuggestionsFor provides suggestions for the typedName.
 func (c *Command) SuggestionsFor(typedName string) []string {
 	suggestions := []string{}
 	for _, cmd := range c.commands {
@@ -546,32 +605,20 @@ func (c *Command) SuggestionsFor(typedName string) []string {
 	return suggestions
 }
 
+// VisitParents visits all parents of the command and invokes fn on each parent.
 func (c *Command) VisitParents(fn func(*Command)) {
-	var traverse func(*Command) *Command
-
-	traverse = func(x *Command) *Command {
-		if x != c {
-			fn(x)
-		}
-		if x.HasParent() {
-			return traverse(x.parent)
-		}
-		return x
+	if c.HasParent() {
+		fn(c.Parent())
+		c.Parent().VisitParents(fn)
 	}
-	traverse(c)
 }
 
+// Root finds root command.
 func (c *Command) Root() *Command {
-	var findRoot func(*Command) *Command
-
-	findRoot = func(x *Command) *Command {
-		if x.HasParent() {
-			return findRoot(x.parent)
-		}
-		return x
+	if c.HasParent() {
+		return c.Parent().Root()
 	}
-
-	return findRoot(c)
+	return c
 }
 
 // ArgsLenAtDash will return the length of f.Args at the moment when a -- was
@@ -593,21 +640,23 @@ func (c *Command) execute(a []string) (err error) {
 
 	// initialize help flag as the last point possible to allow for user
 	// overriding
-	c.initHelpFlag()
+	c.InitDefaultHelpFlag()
 
 	err = c.ParseFlags(a)
 	if err != nil {
 		return c.FlagErrorFunc()(c, err)
 	}
-	// If help is called, regardless of other flags, return we want help
+
+	// If help is called, regardless of other flags, return we want help.
 	// Also say we need help if the command isn't runnable.
 	helpVal, err := c.Flags().GetBool("help")
 	if err != nil {
 		// should be impossible to get here as we always declare a help
-		// flag in initHelpFlag()
+		// flag in InitDefaultHelpFlag()
 		c.Println("\"help\" flag declared as non-bool. Please correct your code")
 		return err
 	}
+
 	if helpVal || !c.Runnable() {
 		return flag.ErrHelp
 	}
@@ -642,6 +691,9 @@ func (c *Command) execute(a []string) (err error) {
 		c.PreRun(c, argWoFlags)
 	}
 
+	if err := c.validateRequiredFlags(); err != nil {
+		return err
+	}
 	if c.RunE != nil {
 		if err := c.RunE(c, argWoFlags); err != nil {
 			return err
@@ -677,18 +729,7 @@ func (c *Command) preRun() {
 	}
 }
 
-func (c *Command) errorMsgFromParse() string {
-	s := c.flagErrorBuf.String()
-
-	x := strings.Split(s, "\n")
-
-	if len(x) > 0 {
-		return x[0]
-	}
-	return ""
-}
-
-// Call execute to use the args (os.Args[1:] by default)
+// Execute uses the args (os.Args[1:] by default)
 // and run through the command tree finding appropriate matches
 // for commands and then corresponding flags.
 func (c *Command) Execute() error {
@@ -696,8 +737,8 @@ func (c *Command) Execute() error {
 	return err
 }
 
+// ExecuteC executes the command.
 func (c *Command) ExecuteC() (cmd *Command, err error) {
-
 	// Regardless of what command execute is called on, run on Root only
 	if c.HasParent() {
 		return c.Root().ExecuteC()
@@ -710,7 +751,7 @@ func (c *Command) ExecuteC() (cmd *Command, err error) {
 
 	// initialize help as the last point possible to allow for user
 	// overriding
-	c.initHelpCmd()
+	c.InitDefaultHelpCmd()
 
 	var args []string
 
@@ -759,9 +800,8 @@ func (c *Command) ExecuteC() (cmd *Command, err error) {
 		if !cmd.SilenceUsage && !c.SilenceUsage {
 			c.Println(cmd.UsageString())
 		}
-		return cmd, err
 	}
-	return cmd, nil
+	return cmd, err
 }
 
 func (c *Command) ValidateArgs(args []string) error {
@@ -771,49 +811,81 @@ func (c *Command) ValidateArgs(args []string) error {
 	return c.Args(c, args)
 }
 
-func (c *Command) initHelpFlag() {
+func (c *Command) validateRequiredFlags() error {
+	flags := c.Flags()
+	missingFlagNames := []string{}
+	flags.VisitAll(func(pflag *flag.Flag) {
+		requiredAnnotation, found := pflag.Annotations[BashCompOneRequiredFlag]
+		if !found {
+			return
+		}
+		if (requiredAnnotation[0] == "true") && !pflag.Changed {
+			missingFlagNames = append(missingFlagNames, pflag.Name)
+		}
+	})
+
+	if len(missingFlagNames) > 0 {
+		return fmt.Errorf(`Required flag(s) "%s" have/has not been set`, strings.Join(missingFlagNames, `", "`))
+	}
+	return nil
+}
+
+// InitDefaultHelpFlag adds default help flag to c.
+// It is called automatically by executing the c or by calling help and usage.
+// If c already has help flag, it will do nothing.
+func (c *Command) InitDefaultHelpFlag() {
 	c.mergePersistentFlags()
 	if c.Flags().Lookup("help") == nil {
-		c.Flags().BoolP("help", "h", false, "help for "+c.Name())
+		usage := "help for "
+		if c.Name() == "" {
+			usage += "this command"
+		} else {
+			usage += c.Name()
+		}
+		c.Flags().BoolP("help", "h", false, usage)
 	}
 }
 
-func (c *Command) initHelpCmd() {
-	if c.helpCommand == nil {
-		if !c.HasSubCommands() {
-			return
-		}
+// 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.
+func (c *Command) InitDefaultHelpCmd() {
+	if !c.HasSubCommands() {
+		return
+	}
 
+	if c.helpCommand == nil {
 		c.helpCommand = &Command{
 			Use:   "help [command]",
 			Short: "Help about any command",
 			Long: `Help provides help for any command in the application.
-    Simply type ` + c.Name() + ` help [path to command] for full details.`,
-			PersistentPreRun:  func(cmd *Command, args []string) {},
-			PersistentPostRun: func(cmd *Command, args []string) {},
+Simply type ` + c.Name() + ` help [path to command] for full details.`,
 
 			Run: func(c *Command, args []string) {
 				cmd, _, e := c.Root().Find(args)
 				if cmd == nil || e != nil {
-					c.Printf("Unknown help topic %#q.", args)
+					c.Printf("Unknown help topic %#q\n", args)
 					c.Root().Usage()
 				} else {
-					helpFunc := cmd.HelpFunc()
-					helpFunc(cmd, args)
+					cmd.InitDefaultHelpFlag() // make possible 'help' flag to be shown
+					cmd.Help()
 				}
 			},
 		}
 	}
+	c.RemoveCommand(c.helpCommand)
 	c.AddCommand(c.helpCommand)
 }
 
-// Used for testing
+// ResetCommands used for testing.
 func (c *Command) ResetCommands() {
+	c.parent = nil
 	c.commands = nil
 	c.helpCommand = nil
+	c.parentsPflags = nil
 }
 
-// Sorts commands by their names
+// Sorts commands by their names.
 type commandSorterByName []*Command
 
 func (c commandSorterByName) Len() int           { return len(c) }
@@ -893,72 +965,45 @@ main:
 	}
 }
 
-// Print is a convenience method to Print to the defined output
+// Print is a convenience method to Print to the defined output, fallback to Stderr if not set.
 func (c *Command) Print(i ...interface{}) {
-	fmt.Fprint(c.Out(), i...)
+	fmt.Fprint(c.OutOrStderr(), i...)
 }
 
-// Println is a convenience method to Println to the defined output
+// Println is a convenience method to Println to the defined output, fallback to Stderr if not set.
 func (c *Command) Println(i ...interface{}) {
-	str := fmt.Sprintln(i...)
-	c.Print(str)
+	c.Print(fmt.Sprintln(i...))
 }
 
-// Printf is a convenience method to Printf to the defined output
+// Printf is a convenience method to Printf to the defined output, fallback to Stderr if not set.
 func (c *Command) Printf(format string, i ...interface{}) {
-	str := fmt.Sprintf(format, i...)
-	c.Print(str)
-}
-
-// Output the usage for the command
-// Used when a user provides invalid input
-// Can be defined by user by overriding UsageFunc
-func (c *Command) Usage() error {
-	c.mergePersistentFlags()
-	err := c.UsageFunc()(c)
-	return err
-}
-
-// Output the help for the command
-// Used when a user calls help [command]
-// by the default HelpFunc in the commander
-func (c *Command) Help() error {
-	c.mergePersistentFlags()
-	err := tmpl(c.getOutOrStdout(), c.HelpTemplate(), c)
-	return err
-}
-
-func (c *Command) UsageString() string {
-	tmpOutput := c.output
-	bb := new(bytes.Buffer)
-	c.SetOutput(bb)
-	c.Usage()
-	c.output = tmpOutput
-	return bb.String()
+	c.Print(fmt.Sprintf(format, i...))
 }
 
 // CommandPath returns the full path to this command.
 func (c *Command) CommandPath() string {
-	str := c.Name()
-	x := c
-	for x.HasParent() {
-		str = x.parent.Name() + " " + str
-		x = x.parent
-	}
-	return str
-}
-
-//The full usage for a given command (including parents)
-func (c *Command) UseLine() string {
-	str := ""
 	if c.HasParent() {
-		str = c.parent.CommandPath() + " "
+		return c.Parent().CommandPath() + " " + c.Name()
 	}
-	return str + c.Use
+	return c.Name()
 }
 
-// For use in determining which flags have been assigned to which commands
-// and which persist
+// UseLine puts out the full usage for a given command (including parents).
+func (c *Command) UseLine() string {
+	var useline string
+	if c.HasParent() {
+		useline = c.parent.CommandPath() + " " + c.Use
+	} else {
+		useline = c.Use
+	}
+	if c.HasAvailableFlags() && !strings.Contains(useline, "[flags]") {
+		useline += " [flags]"
+	}
+	return useline
+}
+
+// DebugFlags used to determine which flags have been assigned to which commands
+// and which persist.
 func (c *Command) DebugFlags() {
 	c.Println("DebugFlags called on", c.Name())
 	var debugflags func(*Command)
@@ -969,12 +1014,8 @@ func (c *Command) DebugFlags() {
 		}
 		if x.HasFlags() {
 			x.flags.VisitAll(func(f *flag.Flag) {
-				if x.HasPersistentFlags() {
-					if x.persistentFlag(f.Name) == nil {
-						c.Println("  -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, "  [L]")
-					} else {
-						c.Println("  -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, "  [LP]")
-					}
+				if x.HasPersistentFlags() && x.persistentFlag(f.Name) != nil {
+					c.Println("  -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, "  [LP]")
 				} else {
 					c.Println("  -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, "  [L]")
 				}
@@ -1004,9 +1045,6 @@ func (c *Command) DebugFlags() {
 
 // Name returns the command's name: the first word in the use line.
 func (c *Command) Name() string {
-	if c.name != "" {
-		return c.name
-	}
 	name := c.Use
 	i := strings.Index(name, " ")
 	if i >= 0 {
@@ -1025,9 +1063,9 @@ func (c *Command) HasAlias(s string) bool {
 	return false
 }
 
-// HasNameOrAliasPrefix returns true if the Name or any of aliases start
+// hasNameOrAliasPrefix returns true if the Name or any of aliases start
 // with prefix
-func (c *Command) HasNameOrAliasPrefix(prefix string) bool {
+func (c *Command) hasNameOrAliasPrefix(prefix string) bool {
 	if strings.HasPrefix(c.Name(), prefix) {
 		return true
 	}
@@ -1039,26 +1077,28 @@ func (c *Command) HasNameOrAliasPrefix(prefix string) bool {
 	return false
 }
 
+// NameAndAliases returns a list of the command name and all aliases
 func (c *Command) NameAndAliases() string {
 	return strings.Join(append([]string{c.Name()}, c.Aliases...), ", ")
 }
 
+// HasExample determines if the command has example.
 func (c *Command) HasExample() bool {
 	return len(c.Example) > 0
 }
 
-// Runnable determines if the command is itself runnable
+// Runnable determines if the command is itself runnable.
 func (c *Command) Runnable() bool {
 	return c.Run != nil || c.RunE != nil
 }
 
-// HasSubCommands determines if the command has children commands
+// HasSubCommands determines if the command has children commands.
 func (c *Command) HasSubCommands() bool {
 	return len(c.commands) > 0
 }
 
 // IsAvailableCommand determines if a command is available as a non-help command
-// (this includes all non deprecated/hidden commands)
+// (this includes all non deprecated/hidden commands).
 func (c *Command) IsAvailableCommand() bool {
 	if len(c.Deprecated) != 0 || c.Hidden {
 		return false
@@ -1075,11 +1115,12 @@ func (c *Command) IsAvailableCommand() bool {
 	return false
 }
 
-// IsHelpCommand determines if a command is a 'help' command; a help command is
-// determined by the fact that it is NOT runnable/hidden/deprecated, and has no
-// sub commands that are runnable/hidden/deprecated
-func (c *Command) IsHelpCommand() bool {
-
+// IsAdditionalHelpTopicCommand determines if a command is an additional
+// help topic command; additional help topic command is determined by the
+// fact that it is NOT runnable/hidden/deprecated, and has no sub commands that
+// are runnable/hidden/deprecated.
+// Concrete example: https://github.com/spf13/cobra/issues/393#issuecomment-282741924.
+func (c *Command) IsAdditionalHelpTopicCommand() bool {
 	// if a command is runnable, deprecated, or hidden it is not a 'help' command
 	if c.Runnable() || len(c.Deprecated) != 0 || c.Hidden {
 		return false
@@ -1087,7 +1128,7 @@ func (c *Command) IsHelpCommand() bool {
 
 	// if any non-help sub commands are found, the command is not a 'help' command
 	for _, sub := range c.commands {
-		if !sub.IsHelpCommand() {
+		if !sub.IsAdditionalHelpTopicCommand() {
 			return false
 		}
 	}
@@ -1096,14 +1137,13 @@ func (c *Command) IsHelpCommand() bool {
 	return true
 }
 
-// HasHelpSubCommands determines if a command has any avilable 'help' sub commands
+// HasHelpSubCommands determines if a command has any available 'help' sub commands
 // that need to be shown in the usage/help default template under 'additional help
-// topics'
+// topics'.
 func (c *Command) HasHelpSubCommands() bool {
-
 	// return true on the first found available 'help' sub command
 	for _, sub := range c.commands {
-		if sub.IsHelpCommand() {
+		if sub.IsAdditionalHelpTopicCommand() {
 			return true
 		}
 	}
@@ -1113,9 +1153,8 @@ func (c *Command) HasHelpSubCommands() bool {
 }
 
 // HasAvailableSubCommands determines if a command has available sub commands that
-// need to be shown in the usage/help default template under 'available commands'
+// need to be shown in the usage/help default template under 'available commands'.
 func (c *Command) HasAvailableSubCommands() bool {
-
 	// return true on the first found available (non deprecated/help/hidden)
 	// sub command
 	for _, sub := range c.commands {
@@ -1129,17 +1168,18 @@ func (c *Command) HasAvailableSubCommands() bool {
 	return false
 }
 
-// Determine if the command is a child command
+// HasParent determines if the command is a child command.
 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 doesn't exists.
 func (c *Command) GlobalNormalizationFunc() func(f *flag.FlagSet, name string) flag.NormalizedName {
 	return c.globNormFunc
 }
 
-// Get the complete FlagSet that applies to this command (local and persistent declared here and by all parents)
+// Flags returns the complete FlagSet that applies
+// to this command (local and persistent declared here and by all parents).
 func (c *Command) Flags() *flag.FlagSet {
 	if c.flags == nil {
 		c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
@@ -1148,10 +1188,11 @@ func (c *Command) Flags() *flag.FlagSet {
 		}
 		c.flags.SetOutput(c.flagErrorBuf)
 	}
+
 	return c.flags
 }
 
-// LocalNonPersistentFlags are flags specific to this command which will NOT persist to subcommands
+// LocalNonPersistentFlags are flags specific to this command which will NOT persist to subcommands.
 func (c *Command) LocalNonPersistentFlags() *flag.FlagSet {
 	persistentFlags := c.PersistentFlags()
 
@@ -1164,59 +1205,63 @@ func (c *Command) LocalNonPersistentFlags() *flag.FlagSet {
 	return out
 }
 
-// Get the local FlagSet specifically set in the current command
+// LocalFlags returns the local FlagSet specifically set in the current command.
 func (c *Command) LocalFlags() *flag.FlagSet {
 	c.mergePersistentFlags()
 
-	local := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
-	c.lflags.VisitAll(func(f *flag.Flag) {
-		local.AddFlag(f)
-	})
-	if !c.HasParent() {
-		flag.CommandLine.VisitAll(func(f *flag.Flag) {
-			if local.Lookup(f.Name) == nil {
-				local.AddFlag(f)
-			}
-		})
+	if c.lflags == nil {
+		c.lflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+		if c.flagErrorBuf == nil {
+			c.flagErrorBuf = new(bytes.Buffer)
+		}
+		c.lflags.SetOutput(c.flagErrorBuf)
 	}
-	return local
+	c.lflags.SortFlags = c.Flags().SortFlags
+	if c.globNormFunc != nil {
+		c.lflags.SetNormalizeFunc(c.globNormFunc)
+	}
+
+	addToLocal := func(f *flag.Flag) {
+		if c.lflags.Lookup(f.Name) == nil && c.parentsPflags.Lookup(f.Name) == nil {
+			c.lflags.AddFlag(f)
+		}
+	}
+	c.Flags().VisitAll(addToLocal)
+	c.PersistentFlags().VisitAll(addToLocal)
+	return c.lflags
 }
 
-// All Flags which were inherited from parents commands
+// InheritedFlags returns all flags which were inherited from parents commands.
 func (c *Command) InheritedFlags() *flag.FlagSet {
 	c.mergePersistentFlags()
 
-	inherited := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	if c.iflags == nil {
+		c.iflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+		if c.flagErrorBuf == nil {
+			c.flagErrorBuf = new(bytes.Buffer)
+		}
+		c.iflags.SetOutput(c.flagErrorBuf)
+	}
+
 	local := c.LocalFlags()
-
-	var rmerge func(x *Command)
-
-	rmerge = func(x *Command) {
-		if x.HasPersistentFlags() {
-			x.PersistentFlags().VisitAll(func(f *flag.Flag) {
-				if inherited.Lookup(f.Name) == nil && local.Lookup(f.Name) == nil {
-					inherited.AddFlag(f)
-				}
-			})
-		}
-		if x.HasParent() {
-			rmerge(x.parent)
-		}
+	if c.globNormFunc != nil {
+		c.iflags.SetNormalizeFunc(c.globNormFunc)
 	}
 
-	if c.HasParent() {
-		rmerge(c.parent)
-	}
-
-	return inherited
+	c.parentsPflags.VisitAll(func(f *flag.Flag) {
+		if c.iflags.Lookup(f.Name) == nil && local.Lookup(f.Name) == nil {
+			c.iflags.AddFlag(f)
+		}
+	})
+	return c.iflags
 }
 
-// All Flags which were not inherited from parent commands
+// NonInheritedFlags returns all flags which were not inherited from parent commands.
 func (c *Command) NonInheritedFlags() *flag.FlagSet {
 	return c.LocalFlags()
 }
 
-// Get the Persistent FlagSet specifically set in the current command
+// PersistentFlags returns the persistent FlagSet specifically set in the current command.
 func (c *Command) PersistentFlags() *flag.FlagSet {
 	if c.pflags == nil {
 		c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
@@ -1228,7 +1273,7 @@ func (c *Command) PersistentFlags() *flag.FlagSet {
 	return c.pflags
 }
 
-// For use in testing
+// ResetFlags is used in testing.
 func (c *Command) ResetFlags() {
 	c.flagErrorBuf = new(bytes.Buffer)
 	c.flagErrorBuf.Reset()
@@ -1236,52 +1281,56 @@ func (c *Command) ResetFlags() {
 	c.flags.SetOutput(c.flagErrorBuf)
 	c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 	c.pflags.SetOutput(c.flagErrorBuf)
+
+	c.lflags = nil
+	c.iflags = nil
+	c.parentsPflags = nil
 }
 
-// Does the command contain any flags (local plus persistent from the entire structure)
+// HasFlags checks if the command contains any flags (local plus persistent from the entire structure).
 func (c *Command) HasFlags() bool {
 	return c.Flags().HasFlags()
 }
 
-// Does the command contain persistent flags
+// HasPersistentFlags checks if the command contains persistent flags.
 func (c *Command) HasPersistentFlags() bool {
 	return c.PersistentFlags().HasFlags()
 }
 
-// Does the command has flags specifically declared locally
+// HasLocalFlags checks if the command has flags specifically declared locally.
 func (c *Command) HasLocalFlags() bool {
 	return c.LocalFlags().HasFlags()
 }
 
-// Does the command have flags inherited from its parent command
+// HasInheritedFlags checks if the command has flags inherited from its parent command.
 func (c *Command) HasInheritedFlags() bool {
 	return c.InheritedFlags().HasFlags()
 }
 
-// Does the command contain any flags (local plus persistent from the entire
-// structure) which are not hidden or deprecated
+// HasAvailableFlags checks if the command contains any flags (local plus persistent from the entire
+// structure) which are not hidden or deprecated.
 func (c *Command) HasAvailableFlags() bool {
 	return c.Flags().HasAvailableFlags()
 }
 
-// Does the command contain persistent flags which are not hidden or deprecated
+// HasAvailablePersistentFlags checks if the command contains persistent flags which are not hidden or deprecated.
 func (c *Command) HasAvailablePersistentFlags() bool {
 	return c.PersistentFlags().HasAvailableFlags()
 }
 
-// Does the command has flags specifically declared locally which are not hidden
-// or deprecated
+// HasAvailableLocalFlags checks if the command has flags specifically declared locally which are not hidden
+// or deprecated.
 func (c *Command) HasAvailableLocalFlags() bool {
 	return c.LocalFlags().HasAvailableFlags()
 }
 
-// Does the command have flags inherited from its parent command which are
-// not hidden or deprecated
+// HasAvailableInheritedFlags checks if the command has flags inherited from its parent command which are
+// not hidden or deprecated.
 func (c *Command) HasAvailableInheritedFlags() bool {
 	return c.InheritedFlags().HasAvailableFlags()
 }
 
-// Flag climbs up the command tree looking for matching flag
+// Flag climbs up the command tree looking for matching flag.
 func (c *Command) Flag(name string) (flag *flag.Flag) {
 	flag = c.Flags().Lookup(name)
 
@@ -1292,68 +1341,69 @@ func (c *Command) Flag(name string) (flag *flag.Flag) {
 	return
 }
 
-// recursively find matching persistent flag
+// Recursively find matching persistent flag.
 func (c *Command) persistentFlag(name string) (flag *flag.Flag) {
 	if c.HasPersistentFlags() {
 		flag = c.PersistentFlags().Lookup(name)
 	}
 
-	if flag == nil && c.HasParent() {
-		flag = c.parent.persistentFlag(name)
+	if flag == nil {
+		c.updateParentsPflags()
+		flag = c.parentsPflags.Lookup(name)
 	}
 	return
 }
 
-// ParseFlags parses persistent flag tree & local flags
-func (c *Command) ParseFlags(args []string) (err error) {
+// ParseFlags parses persistent flag tree and local flags.
+func (c *Command) ParseFlags(args []string) error {
 	if c.DisableFlagParsing {
 		return nil
 	}
+
+	if c.flagErrorBuf == nil {
+		c.flagErrorBuf = new(bytes.Buffer)
+	}
+	beforeErrorBufLen := c.flagErrorBuf.Len()
 	c.mergePersistentFlags()
-	err = c.Flags().Parse(args)
-	return
+	err := c.Flags().Parse(args)
+	// Print warnings if they occurred (e.g. deprecated flag messages).
+	if c.flagErrorBuf.Len()-beforeErrorBufLen > 0 && err == nil {
+		c.Print(c.flagErrorBuf.String())
+	}
+
+	return err
 }
 
-// Parent returns a commands parent command
+// Parent returns a commands parent command.
 func (c *Command) Parent() *Command {
 	return c.parent
 }
 
+// mergePersistentFlags merges c.PersistentFlags() to c.Flags()
+// and adds missing persistent flags of all parents.
 func (c *Command) mergePersistentFlags() {
-	var rmerge func(x *Command)
-
-	// Save the set of local flags
-	if c.lflags == nil {
-		c.lflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
-		if c.flagErrorBuf == nil {
-			c.flagErrorBuf = new(bytes.Buffer)
-		}
-		c.lflags.SetOutput(c.flagErrorBuf)
-		addtolocal := func(f *flag.Flag) {
-			c.lflags.AddFlag(f)
-		}
-		c.Flags().VisitAll(addtolocal)
-		c.PersistentFlags().VisitAll(addtolocal)
-	}
-	rmerge = func(x *Command) {
-		if !x.HasParent() {
-			flag.CommandLine.VisitAll(func(f *flag.Flag) {
-				if x.PersistentFlags().Lookup(f.Name) == nil {
-					x.PersistentFlags().AddFlag(f)
-				}
-			})
-		}
-		if x.HasPersistentFlags() {
-			x.PersistentFlags().VisitAll(func(f *flag.Flag) {
-				if c.Flags().Lookup(f.Name) == nil {
-					c.Flags().AddFlag(f)
-				}
-			})
-		}
-		if x.HasParent() {
-			rmerge(x.parent)
-		}
-	}
-
-	rmerge(c)
+	c.updateParentsPflags()
+	c.Flags().AddFlagSet(c.PersistentFlags())
+	c.Flags().AddFlagSet(c.parentsPflags)
+}
+
+// updateParentsPflags updates c.parentsPflags by adding
+// new persistent flags of all parents.
+// If c.parentsPflags == nil, it makes new.
+func (c *Command) updateParentsPflags() {
+	if c.parentsPflags == nil {
+		c.parentsPflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+		c.parentsPflags.SetOutput(c.flagErrorBuf)
+		c.parentsPflags.SortFlags = false
+	}
+
+	if c.globNormFunc != nil {
+		c.parentsPflags.SetNormalizeFunc(c.globNormFunc)
+	}
+
+	c.Root().PersistentFlags().AddFlagSet(flag.CommandLine)
+
+	c.VisitParents(func(parent *Command) {
+		c.parentsPflags.AddFlagSet(parent.PersistentFlags())
+	})
 }
diff --git a/vendor/github.com/spf13/cobra/command_win.go b/vendor/github.com/spf13/cobra/command_win.go
index 4b0eaa1b6b..edec728e4f 100644
--- a/vendor/github.com/spf13/cobra/command_win.go
+++ b/vendor/github.com/spf13/cobra/command_win.go
@@ -11,14 +11,8 @@ import (
 
 var preExecHookFn = preExecHook
 
-// enables an information splash screen on Windows if the CLI is started from explorer.exe.
-var MousetrapHelpText string = `This is a command line tool
-
-You need to open cmd.exe and run it from there.
-`
-
 func preExecHook(c *Command) {
-	if mousetrap.StartedByExplorer() {
+	if MousetrapHelpText != "" && mousetrap.StartedByExplorer() {
 		c.Print(MousetrapHelpText)
 		time.Sleep(5 * time.Second)
 		os.Exit(1)
diff --git a/vendor/github.com/spf13/cobra/doc/man_docs.go b/vendor/github.com/spf13/cobra/doc/man_docs.go
index ae44aaac78..ce92332dd1 100644
--- a/vendor/github.com/spf13/cobra/doc/man_docs.go
+++ b/vendor/github.com/spf13/cobra/doc/man_docs.go
@@ -23,21 +23,21 @@ import (
 	"strings"
 	"time"
 
-	mangen "github.com/cpuguy83/go-md2man/md2man"
+	"github.com/cpuguy83/go-md2man/md2man"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 )
 
 // GenManTree will generate a man page for this command and all descendants
 // in the directory given. The header may be nil. This function may not work
-// correctly if your command names have - in them. If you have `cmd` with two
-// subcmds, `sub` and `sub-third`. And `sub` has a subcommand called `third`
+// correctly if your command names have `-` in them. If you have `cmd` with two
+// subcmds, `sub` and `sub-third`, and `sub` has a subcommand called `third`
 // it is undefined which help output will be in the file `cmd-sub-third.1`.
 func GenManTree(cmd *cobra.Command, header *GenManHeader, dir string) error {
 	return GenManTreeFromOpts(cmd, GenManTreeOptions{
 		Header:           header,
 		Path:             dir,
-		CommandSeparator: "_",
+		CommandSeparator: "-",
 	})
 }
 
@@ -49,7 +49,7 @@ func GenManTreeFromOpts(cmd *cobra.Command, opts GenManTreeOptions) error {
 		header = &GenManHeader{}
 	}
 	for _, c := range cmd.Commands() {
-		if !c.IsAvailableCommand() || c.IsHelpCommand() {
+		if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
 			continue
 		}
 		if err := GenManTreeFromOpts(c, opts); err != nil {
@@ -77,6 +77,8 @@ func GenManTreeFromOpts(cmd *cobra.Command, opts GenManTreeOptions) error {
 	return GenMan(cmd, &headerCopy, f)
 }
 
+// GenManTreeOptions is the options for generating the man pages.
+// Used only in GenManTreeFromOpts.
 type GenManTreeOptions struct {
 	Header           *GenManHeader
 	Path             string
@@ -105,7 +107,7 @@ func GenMan(cmd *cobra.Command, header *GenManHeader, w io.Writer) error {
 	fillHeader(header, cmd.CommandPath())
 
 	b := genMan(cmd, header)
-	_, err := w.Write(mangen.Render(b))
+	_, err := w.Write(md2man.Render(b))
 	return err
 }
 
@@ -126,25 +128,25 @@ func fillHeader(header *GenManHeader, name string) {
 	}
 }
 
-func manPreamble(out io.Writer, header *GenManHeader, cmd *cobra.Command, dashedName string) {
+func manPreamble(buf *bytes.Buffer, header *GenManHeader, cmd *cobra.Command, dashedName string) {
 	description := cmd.Long
 	if len(description) == 0 {
 		description = cmd.Short
 	}
 
-	fmt.Fprintf(out, `%% %s(%s)%s
+	buf.WriteString(fmt.Sprintf(`%% %s(%s)%s
 %% %s
 %% %s
 # NAME
-`, header.Title, header.Section, header.date, header.Source, header.Manual)
-	fmt.Fprintf(out, "%s \\- %s\n\n", dashedName, cmd.Short)
-	fmt.Fprintf(out, "# SYNOPSIS\n")
-	fmt.Fprintf(out, "**%s**\n\n", cmd.UseLine())
-	fmt.Fprintf(out, "# DESCRIPTION\n")
-	fmt.Fprintf(out, "%s\n\n", description)
+`, header.Title, header.Section, header.date, header.Source, header.Manual))
+	buf.WriteString(fmt.Sprintf("%s \\- %s\n\n", dashedName, cmd.Short))
+	buf.WriteString("# SYNOPSIS\n")
+	buf.WriteString(fmt.Sprintf("**%s**\n\n", cmd.UseLine()))
+	buf.WriteString("# DESCRIPTION\n")
+	buf.WriteString(description + "\n\n")
 }
 
-func manPrintFlags(out io.Writer, flags *pflag.FlagSet) {
+func manPrintFlags(buf *bytes.Buffer, flags *pflag.FlagSet) {
 	flags.VisitAll(func(flag *pflag.Flag) {
 		if len(flag.Deprecated) > 0 || flag.Hidden {
 			return
@@ -156,38 +158,41 @@ func manPrintFlags(out io.Writer, flags *pflag.FlagSet) {
 			format = fmt.Sprintf("**--%s**", flag.Name)
 		}
 		if len(flag.NoOptDefVal) > 0 {
-			format = format + "["
+			format += "["
 		}
 		if flag.Value.Type() == "string" {
 			// put quotes on the value
-			format = format + "=%q"
+			format += "=%q"
 		} else {
-			format = format + "=%s"
+			format += "=%s"
 		}
 		if len(flag.NoOptDefVal) > 0 {
-			format = format + "]"
+			format += "]"
 		}
-		format = format + "\n\t%s\n\n"
-		fmt.Fprintf(out, format, flag.DefValue, flag.Usage)
+		format += "\n\t%s\n\n"
+		buf.WriteString(fmt.Sprintf(format, flag.DefValue, flag.Usage))
 	})
 }
 
-func manPrintOptions(out io.Writer, command *cobra.Command) {
+func manPrintOptions(buf *bytes.Buffer, command *cobra.Command) {
 	flags := command.NonInheritedFlags()
 	if flags.HasFlags() {
-		fmt.Fprintf(out, "# OPTIONS\n")
-		manPrintFlags(out, flags)
-		fmt.Fprintf(out, "\n")
+		buf.WriteString("# OPTIONS\n")
+		manPrintFlags(buf, flags)
+		buf.WriteString("\n")
 	}
 	flags = command.InheritedFlags()
 	if flags.HasFlags() {
-		fmt.Fprintf(out, "# OPTIONS INHERITED FROM PARENT COMMANDS\n")
-		manPrintFlags(out, flags)
-		fmt.Fprintf(out, "\n")
+		buf.WriteString("# OPTIONS INHERITED FROM PARENT COMMANDS\n")
+		manPrintFlags(buf, flags)
+		buf.WriteString("\n")
 	}
 }
 
 func genMan(cmd *cobra.Command, header *GenManHeader) []byte {
+	cmd.InitDefaultHelpCmd()
+	cmd.InitDefaultHelpFlag()
+
 	// something like `rootcmd-subcmd1-subcmd2`
 	dashCommandName := strings.Replace(cmd.CommandPath(), " ", "-", -1)
 
@@ -196,11 +201,11 @@ func genMan(cmd *cobra.Command, header *GenManHeader) []byte {
 	manPreamble(buf, header, cmd, dashCommandName)
 	manPrintOptions(buf, cmd)
 	if len(cmd.Example) > 0 {
-		fmt.Fprintf(buf, "# EXAMPLE\n")
-		fmt.Fprintf(buf, "\n%s\n\n", cmd.Example)
+		buf.WriteString("# EXAMPLE\n")
+		buf.WriteString(fmt.Sprintf("```\n%s\n```\n", cmd.Example))
 	}
 	if hasSeeAlso(cmd) {
-		fmt.Fprintf(buf, "# SEE ALSO\n")
+		buf.WriteString("# SEE ALSO\n")
 		seealsos := make([]string, 0)
 		if cmd.HasParent() {
 			parentPath := cmd.Parent().CommandPath()
@@ -216,16 +221,16 @@ func genMan(cmd *cobra.Command, header *GenManHeader) []byte {
 		children := cmd.Commands()
 		sort.Sort(byName(children))
 		for _, c := range children {
-			if !c.IsAvailableCommand() || c.IsHelpCommand() {
+			if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
 				continue
 			}
 			seealso := fmt.Sprintf("**%s-%s(%s)**", dashCommandName, c.Name(), header.Section)
 			seealsos = append(seealsos, seealso)
 		}
-		fmt.Fprintf(buf, "%s\n", strings.Join(seealsos, ", "))
+		buf.WriteString(strings.Join(seealsos, ", ") + "\n")
 	}
 	if !cmd.DisableAutoGenTag {
-		fmt.Fprintf(buf, "# HISTORY\n%s Auto generated by spf13/cobra\n", header.Date.Format("2-Jan-2006"))
+		buf.WriteString(fmt.Sprintf("# HISTORY\n%s Auto generated by spf13/cobra\n", header.Date.Format("2-Jan-2006")))
 	}
 	return buf.Bytes()
 }
diff --git a/vendor/github.com/spf13/cobra/doc/md_docs.go b/vendor/github.com/spf13/cobra/doc/md_docs.go
index fa13631804..68cf5bf648 100644
--- a/vendor/github.com/spf13/cobra/doc/md_docs.go
+++ b/vendor/github.com/spf13/cobra/doc/md_docs.go
@@ -14,6 +14,7 @@
 package doc
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"os"
@@ -25,38 +26,36 @@ import (
 	"github.com/spf13/cobra"
 )
 
-func printOptions(w io.Writer, cmd *cobra.Command, name string) error {
+func printOptions(buf *bytes.Buffer, cmd *cobra.Command, name string) error {
 	flags := cmd.NonInheritedFlags()
-	flags.SetOutput(w)
+	flags.SetOutput(buf)
 	if flags.HasFlags() {
-		if _, err := fmt.Fprintf(w, "### Options\n\n```\n"); err != nil {
-			return err
-		}
+		buf.WriteString("### Options\n\n```\n")
 		flags.PrintDefaults()
-		if _, err := fmt.Fprintf(w, "```\n\n"); err != nil {
-			return err
-		}
+		buf.WriteString("```\n\n")
 	}
 
 	parentFlags := cmd.InheritedFlags()
-	parentFlags.SetOutput(w)
+	parentFlags.SetOutput(buf)
 	if parentFlags.HasFlags() {
-		if _, err := fmt.Fprintf(w, "### Options inherited from parent commands\n\n```\n"); err != nil {
-			return err
-		}
+		buf.WriteString("### Options inherited from parent commands\n\n```\n")
 		parentFlags.PrintDefaults()
-		if _, err := fmt.Fprintf(w, "```\n\n"); err != nil {
-			return err
-		}
+		buf.WriteString("```\n\n")
 	}
 	return nil
 }
 
+// GenMarkdown creates markdown output.
 func GenMarkdown(cmd *cobra.Command, w io.Writer) error {
 	return GenMarkdownCustom(cmd, w, func(s string) string { return s })
 }
 
+// GenMarkdownCustom creates custom markdown output.
 func GenMarkdownCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string) string) error {
+	cmd.InitDefaultHelpCmd()
+	cmd.InitDefaultHelpFlag()
+
+	buf := new(bytes.Buffer)
 	name := cmd.CommandPath()
 
 	short := cmd.Short
@@ -65,49 +64,31 @@ func GenMarkdownCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string)
 		long = short
 	}
 
-	if _, err := fmt.Fprintf(w, "## %s\n\n", name); err != nil {
-		return err
-	}
-	if _, err := fmt.Fprintf(w, "%s\n\n", short); err != nil {
-		return err
-	}
-	if _, err := fmt.Fprintf(w, "### Synopsis\n\n"); err != nil {
-		return err
-	}
-	if _, err := fmt.Fprintf(w, "\n%s\n\n", long); err != nil {
-		return err
-	}
+	buf.WriteString("## " + name + "\n\n")
+	buf.WriteString(short + "\n\n")
+	buf.WriteString("### Synopsis\n\n")
+	buf.WriteString("\n" + long + "\n\n")
 
 	if cmd.Runnable() {
-		if _, err := fmt.Fprintf(w, "```\n%s\n```\n\n", cmd.UseLine()); err != nil {
-			return err
-		}
+		buf.WriteString(fmt.Sprintf("```\n%s\n```\n\n", cmd.UseLine()))
 	}
 
 	if len(cmd.Example) > 0 {
-		if _, err := fmt.Fprintf(w, "### Examples\n\n"); err != nil {
-			return err
-		}
-		if _, err := fmt.Fprintf(w, "```\n%s\n```\n\n", cmd.Example); err != nil {
-			return err
-		}
+		buf.WriteString("### Examples\n\n")
+		buf.WriteString(fmt.Sprintf("```\n%s\n```\n\n", cmd.Example))
 	}
 
-	if err := printOptions(w, cmd, name); err != nil {
+	if err := printOptions(buf, cmd, name); err != nil {
 		return err
 	}
 	if hasSeeAlso(cmd) {
-		if _, err := fmt.Fprintf(w, "### SEE ALSO\n"); err != nil {
-			return err
-		}
+		buf.WriteString("### SEE ALSO\n")
 		if cmd.HasParent() {
 			parent := cmd.Parent()
 			pname := parent.CommandPath()
 			link := pname + ".md"
 			link = strings.Replace(link, " ", "_", -1)
-			if _, err := fmt.Fprintf(w, "* [%s](%s)\t - %s\n", pname, linkHandler(link), parent.Short); err != nil {
-				return err
-			}
+			buf.WriteString(fmt.Sprintf("* [%s](%s)\t - %s\n", pname, linkHandler(link), parent.Short))
 			cmd.VisitParents(func(c *cobra.Command) {
 				if c.DisableAutoGenTag {
 					cmd.DisableAutoGenTag = c.DisableAutoGenTag
@@ -119,37 +100,40 @@ func GenMarkdownCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string)
 		sort.Sort(byName(children))
 
 		for _, child := range children {
-			if !child.IsAvailableCommand() || child.IsHelpCommand() {
+			if !child.IsAvailableCommand() || child.IsAdditionalHelpTopicCommand() {
 				continue
 			}
 			cname := name + " " + child.Name()
 			link := cname + ".md"
 			link = strings.Replace(link, " ", "_", -1)
-			if _, err := fmt.Fprintf(w, "* [%s](%s)\t - %s\n", cname, linkHandler(link), child.Short); err != nil {
-				return err
-			}
-		}
-		if _, err := fmt.Fprintf(w, "\n"); err != nil {
-			return err
+			buf.WriteString(fmt.Sprintf("* [%s](%s)\t - %s\n", cname, linkHandler(link), child.Short))
 		}
+		buf.WriteString("\n")
 	}
 	if !cmd.DisableAutoGenTag {
-		if _, err := fmt.Fprintf(w, "###### Auto generated by spf13/cobra on %s\n", time.Now().Format("2-Jan-2006")); err != nil {
-			return err
-		}
+		buf.WriteString("###### Auto generated by spf13/cobra on " + time.Now().Format("2-Jan-2006") + "\n")
 	}
-	return nil
+	_, err := buf.WriteTo(w)
+	return err
 }
 
+// GenMarkdownTree will generate a markdown page for this command and all
+// descendants in the directory given. The header may be nil.
+// This function may not work correctly if your command names have `-` in them.
+// If you have `cmd` with two subcmds, `sub` and `sub-third`,
+// and `sub` has a subcommand called `third`, it is undefined which
+// help output will be in the file `cmd-sub-third.1`.
 func GenMarkdownTree(cmd *cobra.Command, dir string) error {
 	identity := func(s string) string { return s }
 	emptyStr := func(s string) string { return "" }
 	return GenMarkdownTreeCustom(cmd, dir, emptyStr, identity)
 }
 
+// GenMarkdownTreeCustom is the the same as GenMarkdownTree, but
+// with custom filePrepender and linkHandler.
 func GenMarkdownTreeCustom(cmd *cobra.Command, dir string, filePrepender, linkHandler func(string) string) error {
 	for _, c := range cmd.Commands() {
-		if !c.IsAvailableCommand() || c.IsHelpCommand() {
+		if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
 			continue
 		}
 		if err := GenMarkdownTreeCustom(c, dir, filePrepender, linkHandler); err != nil {
diff --git a/vendor/github.com/spf13/cobra/doc/rest_docs.go b/vendor/github.com/spf13/cobra/doc/rest_docs.go
new file mode 100644
index 0000000000..4913e3ee2e
--- /dev/null
+++ b/vendor/github.com/spf13/cobra/doc/rest_docs.go
@@ -0,0 +1,185 @@
+//Copyright 2015 Red Hat Inc. All rights reserved.
+//
+// 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 doc
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/spf13/cobra"
+)
+
+func printOptionsReST(buf *bytes.Buffer, cmd *cobra.Command, name string) error {
+	flags := cmd.NonInheritedFlags()
+	flags.SetOutput(buf)
+	if flags.HasFlags() {
+		buf.WriteString("Options\n")
+		buf.WriteString("~~~~~~~\n\n::\n\n")
+		flags.PrintDefaults()
+		buf.WriteString("\n")
+	}
+
+	parentFlags := cmd.InheritedFlags()
+	parentFlags.SetOutput(buf)
+	if parentFlags.HasFlags() {
+		buf.WriteString("Options inherited from parent commands\n")
+		buf.WriteString("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\n::\n\n")
+		parentFlags.PrintDefaults()
+		buf.WriteString("\n")
+	}
+	return nil
+}
+
+// linkHandler for default ReST hyperlink markup
+func defaultLinkHandler(name, ref string) string {
+	return fmt.Sprintf("`%s <%s.rst>`_", name, ref)
+}
+
+// GenReST creates reStructured Text output.
+func GenReST(cmd *cobra.Command, w io.Writer) error {
+	return GenReSTCustom(cmd, w, defaultLinkHandler)
+}
+
+// GenReSTCustom creates custom reStructured Text output.
+func GenReSTCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string, string) string) error {
+	cmd.InitDefaultHelpCmd()
+	cmd.InitDefaultHelpFlag()
+
+	buf := new(bytes.Buffer)
+	name := cmd.CommandPath()
+
+	short := cmd.Short
+	long := cmd.Long
+	if len(long) == 0 {
+		long = short
+	}
+	ref := strings.Replace(name, " ", "_", -1)
+
+	buf.WriteString(".. _" + ref + ":\n\n")
+	buf.WriteString(name + "\n")
+	buf.WriteString(strings.Repeat("-", len(name)) + "\n\n")
+	buf.WriteString(short + "\n\n")
+	buf.WriteString("Synopsis\n")
+	buf.WriteString("~~~~~~~~\n\n")
+	buf.WriteString("\n" + long + "\n\n")
+
+	if cmd.Runnable() {
+		buf.WriteString(fmt.Sprintf("::\n\n  %s\n\n", cmd.UseLine()))
+	}
+
+	if len(cmd.Example) > 0 {
+		buf.WriteString("Examples\n")
+		buf.WriteString("~~~~~~~~\n\n")
+		buf.WriteString(fmt.Sprintf("::\n\n%s\n\n", indentString(cmd.Example, "  ")))
+	}
+
+	if err := printOptionsReST(buf, cmd, name); err != nil {
+		return err
+	}
+	if hasSeeAlso(cmd) {
+		buf.WriteString("SEE ALSO\n")
+		buf.WriteString("~~~~~~~~\n\n")
+		if cmd.HasParent() {
+			parent := cmd.Parent()
+			pname := parent.CommandPath()
+			ref = strings.Replace(pname, " ", "_", -1)
+			buf.WriteString(fmt.Sprintf("* %s \t - %s\n", linkHandler(pname, ref), parent.Short))
+			cmd.VisitParents(func(c *cobra.Command) {
+				if c.DisableAutoGenTag {
+					cmd.DisableAutoGenTag = c.DisableAutoGenTag
+				}
+			})
+		}
+
+		children := cmd.Commands()
+		sort.Sort(byName(children))
+
+		for _, child := range children {
+			if !child.IsAvailableCommand() || child.IsAdditionalHelpTopicCommand() {
+				continue
+			}
+			cname := name + " " + child.Name()
+			ref = strings.Replace(cname, " ", "_", -1)
+			buf.WriteString(fmt.Sprintf("* %s \t - %s\n", linkHandler(cname, ref), child.Short))
+		}
+		buf.WriteString("\n")
+	}
+	if !cmd.DisableAutoGenTag {
+		buf.WriteString("*Auto generated by spf13/cobra on " + time.Now().Format("2-Jan-2006") + "*\n")
+	}
+	_, err := buf.WriteTo(w)
+	return err
+}
+
+// GenReSTTree will generate a ReST page for this command and all
+// descendants in the directory given.
+// This function may not work correctly if your command names have `-` in them.
+// If you have `cmd` with two subcmds, `sub` and `sub-third`,
+// and `sub` has a subcommand called `third`, it is undefined which
+// help output will be in the file `cmd-sub-third.1`.
+func GenReSTTree(cmd *cobra.Command, dir string) error {
+	emptyStr := func(s string) string { return "" }
+	return GenReSTTreeCustom(cmd, dir, emptyStr, defaultLinkHandler)
+}
+
+// GenReSTTreeCustom is the the same as GenReSTTree, but
+// with custom filePrepender and linkHandler.
+func GenReSTTreeCustom(cmd *cobra.Command, dir string, filePrepender func(string) string, linkHandler func(string, string) string) error {
+	for _, c := range cmd.Commands() {
+		if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
+			continue
+		}
+		if err := GenReSTTreeCustom(c, dir, filePrepender, linkHandler); err != nil {
+			return err
+		}
+	}
+
+	basename := strings.Replace(cmd.CommandPath(), " ", "_", -1) + ".rst"
+	filename := filepath.Join(dir, basename)
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if _, err := io.WriteString(f, filePrepender(filename)); err != nil {
+		return err
+	}
+	if err := GenReSTCustom(cmd, f, linkHandler); err != nil {
+		return err
+	}
+	return nil
+}
+
+// adapted from: https://github.com/kr/text/blob/main/indent.go
+func indentString(s, p string) string {
+	var res []byte
+	b := []byte(s)
+	prefix := []byte(p)
+	bol := true
+	for _, c := range b {
+		if bol && c != '\n' {
+			res = append(res, prefix...)
+		}
+		res = append(res, c)
+		bol = c == '\n'
+	}
+	return string(res)
+}
diff --git a/vendor/github.com/spf13/cobra/doc/util.go b/vendor/github.com/spf13/cobra/doc/util.go
index a1c6b89ba6..8d3dbecec8 100644
--- a/vendor/github.com/spf13/cobra/doc/util.go
+++ b/vendor/github.com/spf13/cobra/doc/util.go
@@ -13,7 +13,11 @@
 
 package doc
 
-import "github.com/spf13/cobra"
+import (
+	"strings"
+
+	"github.com/spf13/cobra"
+)
 
 // Test to see if we have a reason to print See Also information in docs
 // Basically this is a test for a parent commend or a subcommand which is
@@ -23,7 +27,7 @@ func hasSeeAlso(cmd *cobra.Command) bool {
 		return true
 	}
 	for _, c := range cmd.Commands() {
-		if !c.IsAvailableCommand() || c.IsHelpCommand() {
+		if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
 			continue
 		}
 		return true
@@ -31,6 +35,15 @@ func hasSeeAlso(cmd *cobra.Command) bool {
 	return false
 }
 
+// Temporary workaround for yaml lib generating incorrect yaml with long strings
+// that do not contain \n.
+func forceMultiLine(s string) string {
+	if len(s) > 60 && !strings.Contains(s, "\n") {
+		s = s + "\n"
+	}
+	return s
+}
+
 type byName []*cobra.Command
 
 func (s byName) Len() int           { return len(s) }
diff --git a/vendor/github.com/spf13/cobra/doc/yaml_docs.go b/vendor/github.com/spf13/cobra/doc/yaml_docs.go
new file mode 100644
index 0000000000..ea00af07e8
--- /dev/null
+++ b/vendor/github.com/spf13/cobra/doc/yaml_docs.go
@@ -0,0 +1,169 @@
+// Copyright 2016 French Ben. All rights reserved.
+//
+// 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 doc
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"gopkg.in/yaml.v2"
+)
+
+type cmdOption struct {
+	Name         string
+	Shorthand    string `yaml:",omitempty"`
+	DefaultValue string `yaml:"default_value,omitempty"`
+	Usage        string `yaml:",omitempty"`
+}
+
+type cmdDoc struct {
+	Name             string
+	Synopsis         string      `yaml:",omitempty"`
+	Description      string      `yaml:",omitempty"`
+	Options          []cmdOption `yaml:",omitempty"`
+	InheritedOptions []cmdOption `yaml:"inherited_options,omitempty"`
+	Example          string      `yaml:",omitempty"`
+	SeeAlso          []string    `yaml:"see_also,omitempty"`
+}
+
+// GenYamlTree creates yaml structured ref files for this command and all descendants
+// in the directory given. This function may not work
+// correctly if your command names have `-` in them. If you have `cmd` with two
+// subcmds, `sub` and `sub-third`, and `sub` has a subcommand called `third`
+// it is undefined which help output will be in the file `cmd-sub-third.1`.
+func GenYamlTree(cmd *cobra.Command, dir string) error {
+	identity := func(s string) string { return s }
+	emptyStr := func(s string) string { return "" }
+	return GenYamlTreeCustom(cmd, dir, emptyStr, identity)
+}
+
+// GenYamlTreeCustom creates yaml structured ref files.
+func GenYamlTreeCustom(cmd *cobra.Command, dir string, filePrepender, linkHandler func(string) string) error {
+	for _, c := range cmd.Commands() {
+		if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
+			continue
+		}
+		if err := GenYamlTreeCustom(c, dir, filePrepender, linkHandler); err != nil {
+			return err
+		}
+	}
+
+	basename := strings.Replace(cmd.CommandPath(), " ", "_", -1) + ".yaml"
+	filename := filepath.Join(dir, basename)
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if _, err := io.WriteString(f, filePrepender(filename)); err != nil {
+		return err
+	}
+	if err := GenYamlCustom(cmd, f, linkHandler); err != nil {
+		return err
+	}
+	return nil
+}
+
+// GenYaml creates yaml output.
+func GenYaml(cmd *cobra.Command, w io.Writer) error {
+	return GenYamlCustom(cmd, w, func(s string) string { return s })
+}
+
+// GenYamlCustom creates custom yaml output.
+func GenYamlCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string) string) error {
+	cmd.InitDefaultHelpCmd()
+	cmd.InitDefaultHelpFlag()
+
+	yamlDoc := cmdDoc{}
+	yamlDoc.Name = cmd.CommandPath()
+
+	yamlDoc.Synopsis = forceMultiLine(cmd.Short)
+	yamlDoc.Description = forceMultiLine(cmd.Long)
+
+	if len(cmd.Example) > 0 {
+		yamlDoc.Example = cmd.Example
+	}
+
+	flags := cmd.NonInheritedFlags()
+	if flags.HasFlags() {
+		yamlDoc.Options = genFlagResult(flags)
+	}
+	flags = cmd.InheritedFlags()
+	if flags.HasFlags() {
+		yamlDoc.InheritedOptions = genFlagResult(flags)
+	}
+
+	if hasSeeAlso(cmd) {
+		result := []string{}
+		if cmd.HasParent() {
+			parent := cmd.Parent()
+			result = append(result, parent.CommandPath()+" - "+parent.Short)
+		}
+		children := cmd.Commands()
+		sort.Sort(byName(children))
+		for _, child := range children {
+			if !child.IsAvailableCommand() || child.IsAdditionalHelpTopicCommand() {
+				continue
+			}
+			result = append(result, child.Name()+" - "+child.Short)
+		}
+		yamlDoc.SeeAlso = result
+	}
+
+	final, err := yaml.Marshal(&yamlDoc)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	if _, err := w.Write(final); err != nil {
+		return err
+	}
+	return nil
+}
+
+func genFlagResult(flags *pflag.FlagSet) []cmdOption {
+	var result []cmdOption
+
+	flags.VisitAll(func(flag *pflag.Flag) {
+		// Todo, when we mark a shorthand is deprecated, but specify an empty message.
+		// The flag.ShorthandDeprecated is empty as the shorthand is deprecated.
+		// Using len(flag.ShorthandDeprecated) > 0 can't handle this, others are ok.
+		if !(len(flag.ShorthandDeprecated) > 0) && len(flag.Shorthand) > 0 {
+			opt := cmdOption{
+				flag.Name,
+				flag.Shorthand,
+				flag.DefValue,
+				forceMultiLine(flag.Usage),
+			}
+			result = append(result, opt)
+		} else {
+			opt := cmdOption{
+				Name:         flag.Name,
+				DefaultValue: forceMultiLine(flag.DefValue),
+				Usage:        forceMultiLine(flag.Usage),
+			}
+			result = append(result, opt)
+		}
+	})
+
+	return result
+}
diff --git a/vendor/github.com/spf13/cobra/zsh_completions.go b/vendor/github.com/spf13/cobra/zsh_completions.go
new file mode 100644
index 0000000000..889c22e273
--- /dev/null
+++ b/vendor/github.com/spf13/cobra/zsh_completions.go
@@ -0,0 +1,126 @@
+package cobra
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+)
+
+// GenZshCompletionFile generates zsh completion file.
+func (c *Command) GenZshCompletionFile(filename string) error {
+	outFile, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer outFile.Close()
+
+	return c.GenZshCompletion(outFile)
+}
+
+// GenZshCompletion generates a zsh completion file and writes to the passed writer.
+func (c *Command) GenZshCompletion(w io.Writer) error {
+	buf := new(bytes.Buffer)
+
+	writeHeader(buf, c)
+	maxDepth := maxDepth(c)
+	writeLevelMapping(buf, maxDepth)
+	writeLevelCases(buf, maxDepth, c)
+
+	_, err := buf.WriteTo(w)
+	return err
+}
+
+func writeHeader(w io.Writer, cmd *Command) {
+	fmt.Fprintf(w, "#compdef %s\n\n", cmd.Name())
+}
+
+func maxDepth(c *Command) int {
+	if len(c.Commands()) == 0 {
+		return 0
+	}
+	maxDepthSub := 0
+	for _, s := range c.Commands() {
+		subDepth := maxDepth(s)
+		if subDepth > maxDepthSub {
+			maxDepthSub = subDepth
+		}
+	}
+	return 1 + maxDepthSub
+}
+
+func writeLevelMapping(w io.Writer, numLevels int) {
+	fmt.Fprintln(w, `_arguments \`)
+	for i := 1; i <= numLevels; i++ {
+		fmt.Fprintf(w, `  '%d: :->level%d' \`, i, i)
+		fmt.Fprintln(w)
+	}
+	fmt.Fprintf(w, `  '%d: :%s'`, numLevels+1, "_files")
+	fmt.Fprintln(w)
+}
+
+func writeLevelCases(w io.Writer, maxDepth int, root *Command) {
+	fmt.Fprintln(w, "case $state in")
+	defer fmt.Fprintln(w, "esac")
+
+	for i := 1; i <= maxDepth; i++ {
+		fmt.Fprintf(w, "  level%d)\n", i)
+		writeLevel(w, root, i)
+		fmt.Fprintln(w, "  ;;")
+	}
+	fmt.Fprintln(w, "  *)")
+	fmt.Fprintln(w, "    _arguments '*: :_files'")
+	fmt.Fprintln(w, "  ;;")
+}
+
+func writeLevel(w io.Writer, root *Command, i int) {
+	fmt.Fprintf(w, "    case $words[%d] in\n", i)
+	defer fmt.Fprintln(w, "    esac")
+
+	commands := filterByLevel(root, i)
+	byParent := groupByParent(commands)
+
+	for p, c := range byParent {
+		names := names(c)
+		fmt.Fprintf(w, "      %s)\n", p)
+		fmt.Fprintf(w, "        _arguments '%d: :(%s)'\n", i, strings.Join(names, " "))
+		fmt.Fprintln(w, "      ;;")
+	}
+	fmt.Fprintln(w, "      *)")
+	fmt.Fprintln(w, "        _arguments '*: :_files'")
+	fmt.Fprintln(w, "      ;;")
+
+}
+
+func filterByLevel(c *Command, l int) []*Command {
+	cs := make([]*Command, 0)
+	if l == 0 {
+		cs = append(cs, c)
+		return cs
+	}
+	for _, s := range c.Commands() {
+		cs = append(cs, filterByLevel(s, l-1)...)
+	}
+	return cs
+}
+
+func groupByParent(commands []*Command) map[string][]*Command {
+	m := make(map[string][]*Command)
+	for _, c := range commands {
+		parent := c.Parent()
+		if parent == nil {
+			continue
+		}
+		m[parent.Name()] = append(m[parent.Name()], c)
+	}
+	return m
+}
+
+func names(commands []*Command) []string {
+	ns := make([]string, len(commands))
+	for i, c := range commands {
+		ns[i] = c.Name()
+	}
+	return ns
+}
diff --git a/vendor/github.com/spf13/pflag/README.md b/vendor/github.com/spf13/pflag/README.md
index eefb46dec8..b052414d12 100644
--- a/vendor/github.com/spf13/pflag/README.md
+++ b/vendor/github.com/spf13/pflag/README.md
@@ -246,6 +246,25 @@ It is possible to mark a flag as hidden, meaning it will still function as norma
 flags.MarkHidden("secretFlag")
 ```
 
+## Disable sorting of flags
+`pflag` allows you to disable sorting of flags for help and usage message.
+
+**Example**:
+```go
+flags.BoolP("verbose", "v", false, "verbose output")
+flags.String("coolflag", "yeaah", "it's really cool flag")
+flags.Int("usefulflag", 777, "sometimes it's very useful")
+flags.SortFlags = false
+flags.PrintDefaults()
+```
+**Output**:
+```
+  -v, --verbose           verbose output
+      --coolflag string   it's really cool flag (default "yeaah")
+      --usefulflag int    sometimes it's very useful (default 777)
+```
+
+
 ## Supporting Go flags when using pflag
 In order to support flags defined using Go's `flag` package, they must be added to the `pflag` flagset. This is usually necessary
 to support flags defined by third-party dependencies (e.g. `golang/glog`).
@@ -270,8 +289,8 @@ func main() {
 You can see the full reference documentation of the pflag package
 [at godoc.org][3], or through go's standard documentation system by
 running `godoc -http=:6060` and browsing to
-[http://localhost:6060/pkg/github.com/ogier/pflag][2] after
+[http://localhost:6060/pkg/github.com/spf13/pflag][2] after
 installation.
 
-[2]: http://localhost:6060/pkg/github.com/ogier/pflag
-[3]: http://godoc.org/github.com/ogier/pflag
+[2]: http://localhost:6060/pkg/github.com/spf13/pflag
+[3]: http://godoc.org/github.com/spf13/pflag
diff --git a/vendor/github.com/spf13/pflag/count.go b/vendor/github.com/spf13/pflag/count.go
index d22be41f29..aa126e44d1 100644
--- a/vendor/github.com/spf13/pflag/count.go
+++ b/vendor/github.com/spf13/pflag/count.go
@@ -11,13 +11,13 @@ func newCountValue(val int, p *int) *countValue {
 }
 
 func (i *countValue) Set(s string) error {
-	v, err := strconv.ParseInt(s, 0, 64)
-	// -1 means that no specific value was passed, so increment
-	if v == -1 {
+	// "+1" means that no specific value was passed, so increment
+	if s == "+1" {
 		*i = countValue(*i + 1)
-	} else {
-		*i = countValue(v)
+		return nil
 	}
+	v, err := strconv.ParseInt(s, 0, 0)
+	*i = countValue(v)
 	return err
 }
 
@@ -54,7 +54,7 @@ func (f *FlagSet) CountVar(p *int, name string, usage string) {
 // CountVarP is like CountVar only take a shorthand for the flag name.
 func (f *FlagSet) CountVarP(p *int, name, shorthand string, usage string) {
 	flag := f.VarPF(newCountValue(0, p), name, shorthand, usage)
-	flag.NoOptDefVal = "-1"
+	flag.NoOptDefVal = "+1"
 }
 
 // CountVar like CountVar only the flag is placed on the CommandLine instead of a given flag set
@@ -83,7 +83,9 @@ func (f *FlagSet) CountP(name, shorthand string, usage string) *int {
 	return p
 }
 
-// Count like Count only the flag is placed on the CommandLine isntead of a given flag set
+// Count defines a count flag with specified name, default value, and usage string.
+// The return value is the address of an int variable that stores the value of the flag.
+// A count flag will add 1 to its value evey time it is found on the command line
 func Count(name string, usage string) *int {
 	return CommandLine.CountP(name, "", usage)
 }
diff --git a/vendor/github.com/spf13/pflag/flag.go b/vendor/github.com/spf13/pflag/flag.go
index 746af6327e..73c237b078 100644
--- a/vendor/github.com/spf13/pflag/flag.go
+++ b/vendor/github.com/spf13/pflag/flag.go
@@ -16,9 +16,9 @@ pflag is a drop-in replacement of Go's native flag package. If you import
 pflag under the name "flag" then all code should continue to function
 with no changes.
 
-	import flag "github.com/ogier/pflag"
+	import flag "github.com/spf13/pflag"
 
-	There is one exception to this: if you directly instantiate the Flag struct
+There is one exception to this: if you directly instantiate the Flag struct
 there is one more field "Shorthand" that you will need to set.
 Most code never instantiates this struct directly, and instead uses
 functions such as String(), BoolVar(), and Var(), and is therefore
@@ -134,14 +134,21 @@ type FlagSet struct {
 	// a custom error handler.
 	Usage func()
 
+	// SortFlags is used to indicate, if user wants to have sorted flags in
+	// help/usage messages.
+	SortFlags bool
+
 	name              string
 	parsed            bool
 	actual            map[NormalizedName]*Flag
+	orderedActual     []*Flag
+	sortedActual      []*Flag
 	formal            map[NormalizedName]*Flag
+	orderedFormal     []*Flag
+	sortedFormal      []*Flag
 	shorthands        map[byte]*Flag
 	args              []string // arguments after flags
 	argsLenAtDash     int      // len(args) when a '--' was located when parsing, or -1 if no --
-	exitOnError       bool     // does the program exit if there's an error?
 	errorHandling     ErrorHandling
 	output            io.Writer // nil means stderr; use out() accessor
 	interspersed      bool      // allow interspersed option/non-option args
@@ -156,7 +163,7 @@ type Flag struct {
 	Value               Value               // value as set
 	DefValue            string              // default value (as text); for usage message
 	Changed             bool                // If the user set the value (or if left to default)
-	NoOptDefVal         string              //default value (as text); if the flag is on the command line without any options
+	NoOptDefVal         string              // default value (as text); if the flag is on the command line without any options
 	Deprecated          string              // If this flag is deprecated, this string is the new or now thing to use
 	Hidden              bool                // used by cobra.Command to allow flags to be hidden from help/usage text
 	ShorthandDeprecated string              // If the shorthand of this flag is deprecated, this string is the new or now thing to use
@@ -194,11 +201,19 @@ func sortFlags(flags map[NormalizedName]*Flag) []*Flag {
 // "--getUrl" which may also be translated to "geturl" and everything will work.
 func (f *FlagSet) SetNormalizeFunc(n func(f *FlagSet, name string) NormalizedName) {
 	f.normalizeNameFunc = n
-	for k, v := range f.formal {
-		delete(f.formal, k)
-		nname := f.normalizeFlagName(string(k))
-		f.formal[nname] = v
-		v.Name = string(nname)
+	f.sortedFormal = f.sortedFormal[:0]
+	for fname, flag := range f.formal {
+		nname := f.normalizeFlagName(flag.Name)
+		if fname == nname {
+			continue
+		}
+		flag.Name = string(nname)
+		delete(f.formal, fname)
+		f.formal[nname] = flag
+		if _, set := f.actual[fname]; set {
+			delete(f.actual, fname)
+			f.actual[nname] = flag
+		}
 	}
 }
 
@@ -229,10 +244,25 @@ func (f *FlagSet) SetOutput(output io.Writer) {
 	f.output = output
 }
 
-// VisitAll visits the flags in lexicographical order, calling fn for each.
+// VisitAll visits the flags in lexicographical order or
+// in primordial order if f.SortFlags is false, calling fn for each.
 // It visits all flags, even those not set.
 func (f *FlagSet) VisitAll(fn func(*Flag)) {
-	for _, flag := range sortFlags(f.formal) {
+	if len(f.formal) == 0 {
+		return
+	}
+
+	var flags []*Flag
+	if f.SortFlags {
+		if len(f.formal) != len(f.sortedFormal) {
+			f.sortedFormal = sortFlags(f.formal)
+		}
+		flags = f.sortedFormal
+	} else {
+		flags = f.orderedFormal
+	}
+
+	for _, flag := range flags {
 		fn(flag)
 	}
 }
@@ -253,22 +283,39 @@ func (f *FlagSet) HasAvailableFlags() bool {
 	return false
 }
 
-// VisitAll visits the command-line flags in lexicographical order, calling
-// fn for each.  It visits all flags, even those not set.
+// VisitAll visits the command-line flags in lexicographical order or
+// in primordial order if f.SortFlags is false, calling fn for each.
+// It visits all flags, even those not set.
 func VisitAll(fn func(*Flag)) {
 	CommandLine.VisitAll(fn)
 }
 
-// Visit visits the flags in lexicographical order, calling fn for each.
+// Visit visits the flags in lexicographical order or
+// in primordial order if f.SortFlags is false, calling fn for each.
 // It visits only those flags that have been set.
 func (f *FlagSet) Visit(fn func(*Flag)) {
-	for _, flag := range sortFlags(f.actual) {
+	if len(f.actual) == 0 {
+		return
+	}
+
+	var flags []*Flag
+	if f.SortFlags {
+		if len(f.actual) != len(f.sortedActual) {
+			f.sortedActual = sortFlags(f.actual)
+		}
+		flags = f.sortedActual
+	} else {
+		flags = f.orderedActual
+	}
+
+	for _, flag := range flags {
 		fn(flag)
 	}
 }
 
-// Visit visits the command-line flags in lexicographical order, calling fn
-// for each.  It visits only those flags that have been set.
+// Visit visits the command-line flags in lexicographical order or
+// in primordial order if f.SortFlags is false, calling fn for each.
+// It visits only those flags that have been set.
 func Visit(fn func(*Flag)) {
 	CommandLine.Visit(fn)
 }
@@ -278,6 +325,22 @@ func (f *FlagSet) Lookup(name string) *Flag {
 	return f.lookup(f.normalizeFlagName(name))
 }
 
+// ShorthandLookup returns the Flag structure of the short handed flag,
+// returning nil if none exists.
+// It panics, if len(name) > 1.
+func (f *FlagSet) ShorthandLookup(name string) *Flag {
+	if name == "" {
+		return nil
+	}
+	if len(name) > 1 {
+		msg := fmt.Sprintf("can not look up shorthand which is more than one ASCII character: %q", name)
+		fmt.Fprintf(f.out(), msg)
+		panic(msg)
+	}
+	c := name[0]
+	return f.shorthands[c]
+}
+
 // lookup returns the Flag structure of the named flag, returning nil if none exists.
 func (f *FlagSet) lookup(name NormalizedName) *Flag {
 	return f.formal[name]
@@ -319,7 +382,7 @@ func (f *FlagSet) MarkDeprecated(name string, usageMessage string) error {
 	if flag == nil {
 		return fmt.Errorf("flag %q does not exist", name)
 	}
-	if len(usageMessage) == 0 {
+	if usageMessage == "" {
 		return fmt.Errorf("deprecated message for flag %q must be set", name)
 	}
 	flag.Deprecated = usageMessage
@@ -334,7 +397,7 @@ func (f *FlagSet) MarkShorthandDeprecated(name string, usageMessage string) erro
 	if flag == nil {
 		return fmt.Errorf("flag %q does not exist", name)
 	}
-	if len(usageMessage) == 0 {
+	if usageMessage == "" {
 		return fmt.Errorf("deprecated message for flag %q must be set", name)
 	}
 	flag.ShorthandDeprecated = usageMessage
@@ -358,6 +421,12 @@ func Lookup(name string) *Flag {
 	return CommandLine.Lookup(name)
 }
 
+// ShorthandLookup returns the Flag structure of the short handed flag,
+// returning nil if none exists.
+func ShorthandLookup(name string) *Flag {
+	return CommandLine.ShorthandLookup(name)
+}
+
 // Set sets the value of the named flag.
 func (f *FlagSet) Set(name, value string) error {
 	normalName := f.normalizeFlagName(name)
@@ -365,17 +434,30 @@ func (f *FlagSet) Set(name, value string) error {
 	if !ok {
 		return fmt.Errorf("no such flag -%v", name)
 	}
+
 	err := flag.Value.Set(value)
 	if err != nil {
-		return err
+		var flagName string
+		if flag.Shorthand != "" && flag.ShorthandDeprecated == "" {
+			flagName = fmt.Sprintf("-%s, --%s", flag.Shorthand, flag.Name)
+		} else {
+			flagName = fmt.Sprintf("--%s", flag.Name)
+		}
+		return fmt.Errorf("invalid argument %q for %q flag: %v", value, flagName, err)
 	}
-	if f.actual == nil {
-		f.actual = make(map[NormalizedName]*Flag)
+
+	if !flag.Changed {
+		if f.actual == nil {
+			f.actual = make(map[NormalizedName]*Flag)
+		}
+		f.actual[normalName] = flag
+		f.orderedActual = append(f.orderedActual, flag)
+
+		flag.Changed = true
 	}
-	f.actual[normalName] = flag
-	flag.Changed = true
-	if len(flag.Deprecated) > 0 {
-		fmt.Fprintf(os.Stderr, "Flag --%s has been deprecated, %s\n", flag.Name, flag.Deprecated)
+
+	if flag.Deprecated != "" {
+		fmt.Fprintf(f.out(), "Flag --%s has been deprecated, %s\n", flag.Name, flag.Deprecated)
 	}
 	return nil
 }
@@ -482,6 +564,10 @@ func UnquoteUsage(flag *Flag) (name string, usage string) {
 		name = "int"
 	case "uint64":
 		name = "uint"
+	case "stringSlice":
+		name = "strings"
+	case "intSlice":
+		name = "ints"
 	}
 
 	return
@@ -557,28 +643,28 @@ func wrap(i, w int, s string) string {
 // for all flags in the FlagSet. Wrapped to `cols` columns (0 for no
 // wrapping)
 func (f *FlagSet) FlagUsagesWrapped(cols int) string {
-	x := new(bytes.Buffer)
+	buf := new(bytes.Buffer)
 
 	lines := make([]string, 0, len(f.formal))
 
 	maxlen := 0
 	f.VisitAll(func(flag *Flag) {
-		if len(flag.Deprecated) > 0 || flag.Hidden {
+		if flag.Deprecated != "" || flag.Hidden {
 			return
 		}
 
 		line := ""
-		if len(flag.Shorthand) > 0 && len(flag.ShorthandDeprecated) == 0 {
+		if flag.Shorthand != "" && flag.ShorthandDeprecated == "" {
 			line = fmt.Sprintf("  -%s, --%s", flag.Shorthand, flag.Name)
 		} else {
 			line = fmt.Sprintf("      --%s", flag.Name)
 		}
 
 		varname, usage := UnquoteUsage(flag)
-		if len(varname) > 0 {
+		if varname != "" {
 			line += " " + varname
 		}
-		if len(flag.NoOptDefVal) > 0 {
+		if flag.NoOptDefVal != "" {
 			switch flag.Value.Type() {
 			case "string":
 				line += fmt.Sprintf("[=\"%s\"]", flag.NoOptDefVal)
@@ -586,6 +672,10 @@ func (f *FlagSet) FlagUsagesWrapped(cols int) string {
 				if flag.NoOptDefVal != "true" {
 					line += fmt.Sprintf("[=%s]", flag.NoOptDefVal)
 				}
+			case "count":
+				if flag.NoOptDefVal != "+1" {
+					line += fmt.Sprintf("[=%s]", flag.NoOptDefVal)
+				}
 			default:
 				line += fmt.Sprintf("[=%s]", flag.NoOptDefVal)
 			}
@@ -601,7 +691,7 @@ func (f *FlagSet) FlagUsagesWrapped(cols int) string {
 		line += usage
 		if !flag.defaultIsZeroValue() {
 			if flag.Value.Type() == "string" {
-				line += fmt.Sprintf(" (default \"%s\")", flag.DefValue)
+				line += fmt.Sprintf(" (default %q)", flag.DefValue)
 			} else {
 				line += fmt.Sprintf(" (default %s)", flag.DefValue)
 			}
@@ -614,10 +704,10 @@ func (f *FlagSet) FlagUsagesWrapped(cols int) string {
 		sidx := strings.Index(line, "\x00")
 		spacing := strings.Repeat(" ", maxlen-sidx)
 		// maxlen + 2 comes from + 1 for the \x00 and + 1 for the (deliberate) off-by-one in maxlen-sidx
-		fmt.Fprintln(x, line[:sidx], spacing, wrap(maxlen+2, cols, line[sidx+1:]))
+		fmt.Fprintln(buf, line[:sidx], spacing, wrap(maxlen+2, cols, line[sidx+1:]))
 	}
 
-	return x.String()
+	return buf.String()
 }
 
 // FlagUsages returns a string containing the usage information for all flags in
@@ -714,11 +804,10 @@ func (f *FlagSet) VarP(value Value, name, shorthand, usage string) {
 
 // AddFlag will add the flag to the FlagSet
 func (f *FlagSet) AddFlag(flag *Flag) {
-	// Call normalizeFlagName function only once
 	normalizedFlagName := f.normalizeFlagName(flag.Name)
 
-	_, alreadythere := f.formal[normalizedFlagName]
-	if alreadythere {
+	_, alreadyThere := f.formal[normalizedFlagName]
+	if alreadyThere {
 		msg := fmt.Sprintf("%s flag redefined: %s", f.name, flag.Name)
 		fmt.Fprintln(f.out(), msg)
 		panic(msg) // Happens only if flags are declared with identical names
@@ -729,28 +818,31 @@ func (f *FlagSet) AddFlag(flag *Flag) {
 
 	flag.Name = string(normalizedFlagName)
 	f.formal[normalizedFlagName] = flag
+	f.orderedFormal = append(f.orderedFormal, flag)
 
-	if len(flag.Shorthand) == 0 {
+	if flag.Shorthand == "" {
 		return
 	}
 	if len(flag.Shorthand) > 1 {
-		fmt.Fprintf(f.out(), "%s shorthand more than ASCII character: %s\n", f.name, flag.Shorthand)
-		panic("shorthand is more than one character")
+		msg := fmt.Sprintf("%q shorthand is more than one ASCII character", flag.Shorthand)
+		fmt.Fprintf(f.out(), msg)
+		panic(msg)
 	}
 	if f.shorthands == nil {
 		f.shorthands = make(map[byte]*Flag)
 	}
 	c := flag.Shorthand[0]
-	old, alreadythere := f.shorthands[c]
-	if alreadythere {
-		fmt.Fprintf(f.out(), "%s shorthand reused: %q for %s already used for %s\n", f.name, c, flag.Name, old.Name)
-		panic("shorthand redefinition")
+	used, alreadyThere := f.shorthands[c]
+	if alreadyThere {
+		msg := fmt.Sprintf("unable to redefine %q shorthand in %q flagset: it's already used for %q flag", c, f.name, used.Name)
+		fmt.Fprintf(f.out(), msg)
+		panic(msg)
 	}
 	f.shorthands[c] = flag
 }
 
 // AddFlagSet adds one FlagSet to another. If a flag is already present in f
-// the flag from newSet will be ignored
+// the flag from newSet will be ignored.
 func (f *FlagSet) AddFlagSet(newSet *FlagSet) {
 	if newSet == nil {
 		return
@@ -781,8 +873,10 @@ func VarP(value Value, name, shorthand, usage string) {
 // returns the error.
 func (f *FlagSet) failf(format string, a ...interface{}) error {
 	err := fmt.Errorf(format, a...)
-	fmt.Fprintln(f.out(), err)
-	f.usage()
+	if f.errorHandling != ContinueOnError {
+		fmt.Fprintln(f.out(), err)
+		f.usage()
+	}
 	return err
 }
 
@@ -798,34 +892,6 @@ func (f *FlagSet) usage() {
 	}
 }
 
-func (f *FlagSet) setFlag(flag *Flag, value string, origArg string) error {
-	if err := flag.Value.Set(value); err != nil {
-		return f.failf("invalid argument %q for %s: %v", value, origArg, err)
-	}
-	// mark as visited for Visit()
-	if f.actual == nil {
-		f.actual = make(map[NormalizedName]*Flag)
-	}
-	f.actual[f.normalizeFlagName(flag.Name)] = flag
-	flag.Changed = true
-	if len(flag.Deprecated) > 0 {
-		fmt.Fprintf(os.Stderr, "Flag --%s has been deprecated, %s\n", flag.Name, flag.Deprecated)
-	}
-	if len(flag.ShorthandDeprecated) > 0 && containsShorthand(origArg, flag.Shorthand) {
-		fmt.Fprintf(os.Stderr, "Flag shorthand -%s has been deprecated, %s\n", flag.Shorthand, flag.ShorthandDeprecated)
-	}
-	return nil
-}
-
-func containsShorthand(arg, shorthand string) bool {
-	// filter out flags --<flag_name>
-	if strings.HasPrefix(arg, "-") {
-		return false
-	}
-	arg = strings.SplitN(arg, "=", 2)[0]
-	return strings.Contains(arg, shorthand)
-}
-
 func (f *FlagSet) parseLongArg(s string, args []string, fn parseFunc) (a []string, err error) {
 	a = args
 	name := s[2:]
@@ -833,10 +899,11 @@ func (f *FlagSet) parseLongArg(s string, args []string, fn parseFunc) (a []strin
 		err = f.failf("bad flag syntax: %s", s)
 		return
 	}
+
 	split := strings.SplitN(name, "=", 2)
 	name = split[0]
-	flag, alreadythere := f.formal[f.normalizeFlagName(name)]
-	if !alreadythere {
+	flag, exists := f.formal[f.normalizeFlagName(name)]
+	if !exists {
 		if name == "help" { // special case for nice help message.
 			f.usage()
 			return a, ErrHelp
@@ -844,11 +911,12 @@ func (f *FlagSet) parseLongArg(s string, args []string, fn parseFunc) (a []strin
 		err = f.failf("unknown flag: --%s", name)
 		return
 	}
+
 	var value string
 	if len(split) == 2 {
 		// '--flag=arg'
 		value = split[1]
-	} else if len(flag.NoOptDefVal) > 0 {
+	} else if flag.NoOptDefVal != "" {
 		// '--flag' (arg was optional)
 		value = flag.NoOptDefVal
 	} else if len(a) > 0 {
@@ -860,7 +928,11 @@ func (f *FlagSet) parseLongArg(s string, args []string, fn parseFunc) (a []strin
 		err = f.failf("flag needs an argument: %s", s)
 		return
 	}
-	err = fn(flag, value, s)
+
+	err = fn(flag, value)
+	if err != nil {
+		f.failf(err.Error())
+	}
 	return
 }
 
@@ -868,38 +940,52 @@ func (f *FlagSet) parseSingleShortArg(shorthands string, args []string, fn parse
 	if strings.HasPrefix(shorthands, "test.") {
 		return
 	}
+
 	outArgs = args
 	outShorts = shorthands[1:]
 	c := shorthands[0]
 
-	flag, alreadythere := f.shorthands[c]
-	if !alreadythere {
+	flag, exists := f.shorthands[c]
+	if !exists {
 		if c == 'h' { // special case for nice help message.
 			f.usage()
 			err = ErrHelp
 			return
 		}
-		//TODO continue on error
 		err = f.failf("unknown shorthand flag: %q in -%s", c, shorthands)
 		return
 	}
+
 	var value string
 	if len(shorthands) > 2 && shorthands[1] == '=' {
+		// '-f=arg'
 		value = shorthands[2:]
 		outShorts = ""
-	} else if len(flag.NoOptDefVal) > 0 {
+	} else if flag.NoOptDefVal != "" {
+		// '-f' (arg was optional)
 		value = flag.NoOptDefVal
 	} else if len(shorthands) > 1 {
+		// '-farg'
 		value = shorthands[1:]
 		outShorts = ""
 	} else if len(args) > 0 {
+		// '-f arg'
 		value = args[0]
 		outArgs = args[1:]
 	} else {
+		// '-f' (arg was required)
 		err = f.failf("flag needs an argument: %q in -%s", c, shorthands)
 		return
 	}
-	err = fn(flag, value, shorthands)
+
+	if flag.ShorthandDeprecated != "" {
+		fmt.Fprintf(f.out(), "Flag shorthand -%s has been deprecated, %s\n", flag.Shorthand, flag.ShorthandDeprecated)
+	}
+
+	err = fn(flag, value)
+	if err != nil {
+		f.failf(err.Error())
+	}
 	return
 }
 
@@ -907,6 +993,7 @@ func (f *FlagSet) parseShortArg(s string, args []string, fn parseFunc) (a []stri
 	a = args
 	shorthands := s[1:]
 
+	// "shorthands" can be a series of shorthand letters of flags (e.g. "-vvv").
 	for len(shorthands) > 0 {
 		shorthands, a, err = f.parseSingleShortArg(shorthands, args, fn)
 		if err != nil {
@@ -954,18 +1041,24 @@ func (f *FlagSet) parseArgs(args []string, fn parseFunc) (err error) {
 // The return value will be ErrHelp if -help was set but not defined.
 func (f *FlagSet) Parse(arguments []string) error {
 	f.parsed = true
-	f.args = make([]string, 0, len(arguments))
 
-	assign := func(flag *Flag, value, origArg string) error {
-		return f.setFlag(flag, value, origArg)
+	if len(arguments) < 0 {
+		return nil
 	}
 
-	err := f.parseArgs(arguments, assign)
+	f.args = make([]string, 0, len(arguments))
+
+	set := func(flag *Flag, value string) error {
+		return f.Set(flag.Name, value)
+	}
+
+	err := f.parseArgs(arguments, set)
 	if err != nil {
 		switch f.errorHandling {
 		case ContinueOnError:
 			return err
 		case ExitOnError:
+			fmt.Println(err)
 			os.Exit(2)
 		case PanicOnError:
 			panic(err)
@@ -974,7 +1067,7 @@ func (f *FlagSet) Parse(arguments []string) error {
 	return nil
 }
 
-type parseFunc func(flag *Flag, value, origArg string) error
+type parseFunc func(flag *Flag, value string) error
 
 // ParseAll parses flag definitions from the argument list, which should not
 // include the command name. The arguments for fn are flag and value. Must be
@@ -985,11 +1078,7 @@ func (f *FlagSet) ParseAll(arguments []string, fn func(flag *Flag, value string)
 	f.parsed = true
 	f.args = make([]string, 0, len(arguments))
 
-	assign := func(flag *Flag, value, origArg string) error {
-		return fn(flag, value)
-	}
-
-	err := f.parseArgs(arguments, assign)
+	err := f.parseArgs(arguments, fn)
 	if err != nil {
 		switch f.errorHandling {
 		case ContinueOnError:
@@ -1036,14 +1125,15 @@ func Parsed() bool {
 // CommandLine is the default set of command-line flags, parsed from os.Args.
 var CommandLine = NewFlagSet(os.Args[0], ExitOnError)
 
-// NewFlagSet returns a new, empty flag set with the specified name and
-// error handling property.
+// NewFlagSet returns a new, empty flag set with the specified name,
+// error handling property and SortFlags set to true.
 func NewFlagSet(name string, errorHandling ErrorHandling) *FlagSet {
 	f := &FlagSet{
 		name:          name,
 		errorHandling: errorHandling,
 		argsLenAtDash: -1,
 		interspersed:  true,
+		SortFlags:     true,
 	}
 	return f
 }
diff --git a/vendor/github.com/spf13/pflag/int16.go b/vendor/github.com/spf13/pflag/int16.go
new file mode 100644
index 0000000000..f1a01d05e6
--- /dev/null
+++ b/vendor/github.com/spf13/pflag/int16.go
@@ -0,0 +1,88 @@
+package pflag
+
+import "strconv"
+
+// -- int16 Value
+type int16Value int16
+
+func newInt16Value(val int16, p *int16) *int16Value {
+	*p = val
+	return (*int16Value)(p)
+}
+
+func (i *int16Value) Set(s string) error {
+	v, err := strconv.ParseInt(s, 0, 16)
+	*i = int16Value(v)
+	return err
+}
+
+func (i *int16Value) Type() string {
+	return "int16"
+}
+
+func (i *int16Value) String() string { return strconv.FormatInt(int64(*i), 10) }
+
+func int16Conv(sval string) (interface{}, error) {
+	v, err := strconv.ParseInt(sval, 0, 16)
+	if err != nil {
+		return 0, err
+	}
+	return int16(v), nil
+}
+
+// GetInt16 returns the int16 value of a flag with the given name
+func (f *FlagSet) GetInt16(name string) (int16, error) {
+	val, err := f.getFlagType(name, "int16", int16Conv)
+	if err != nil {
+		return 0, err
+	}
+	return val.(int16), nil
+}
+
+// Int16Var defines an int16 flag with specified name, default value, and usage string.
+// The argument p points to an int16 variable in which to store the value of the flag.
+func (f *FlagSet) Int16Var(p *int16, name string, value int16, usage string) {
+	f.VarP(newInt16Value(value, p), name, "", usage)
+}
+
+// Int16VarP is like Int16Var, but accepts a shorthand letter that can be used after a single dash.
+func (f *FlagSet) Int16VarP(p *int16, name, shorthand string, value int16, usage string) {
+	f.VarP(newInt16Value(value, p), name, shorthand, usage)
+}
+
+// Int16Var defines an int16 flag with specified name, default value, and usage string.
+// The argument p points to an int16 variable in which to store the value of the flag.
+func Int16Var(p *int16, name string, value int16, usage string) {
+	CommandLine.VarP(newInt16Value(value, p), name, "", usage)
+}
+
+// Int16VarP is like Int16Var, but accepts a shorthand letter that can be used after a single dash.
+func Int16VarP(p *int16, name, shorthand string, value int16, usage string) {
+	CommandLine.VarP(newInt16Value(value, p), name, shorthand, usage)
+}
+
+// Int16 defines an int16 flag with specified name, default value, and usage string.
+// The return value is the address of an int16 variable that stores the value of the flag.
+func (f *FlagSet) Int16(name string, value int16, usage string) *int16 {
+	p := new(int16)
+	f.Int16VarP(p, name, "", value, usage)
+	return p
+}
+
+// Int16P is like Int16, but accepts a shorthand letter that can be used after a single dash.
+func (f *FlagSet) Int16P(name, shorthand string, value int16, usage string) *int16 {
+	p := new(int16)
+	f.Int16VarP(p, name, shorthand, value, usage)
+	return p
+}
+
+// Int16 defines an int16 flag with specified name, default value, and usage string.
+// The return value is the address of an int16 variable that stores the value of the flag.
+func Int16(name string, value int16, usage string) *int16 {
+	return CommandLine.Int16P(name, "", value, usage)
+}
+
+// Int16P is like Int16, but accepts a shorthand letter that can be used after a single dash.
+func Int16P(name, shorthand string, value int16, usage string) *int16 {
+	return CommandLine.Int16P(name, shorthand, value, usage)
+}