implemented options command #5036

This is to fix help command showing invalid "minikube <command> options".
It happened because minikube reuses kubectl templates which expects
options cmd to be there.

cmd/minikube/cmd/options.go

@@ -0,0 +1,68 @@
+/*
+Copyright 2019 The Kubernetes Authors 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 cmd
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+
+	"k8s.io/minikube/pkg/minikube/out"
+)
+
+// optionsCmd represents the options command
+var optionsCmd = &cobra.Command{
+	Use:   "options",
+	Short: "Show a list of global command-line options (applies to all commands).",
+	Long:  "Show a list of global command-line options (applies to all commands).",
+	Run:   runOptions,
+}
+
+// runOptions handles the executes the flow of "minikube stop"
+func runOptions(cmd *cobra.Command, args []string) {
+	out.String("The following options can be passed to any command:\n\n")
+	for _, flagName := range viperWhiteList {
+		f := pflag.Lookup(flagName)
+		out.String(flagUsage(f))
+	}
+}
+
+func flagUsage(flag *pflag.Flag) string {
+	x := new(bytes.Buffer)
+
+	if flag.Hidden {
+		return ""
+	}
+
+	format := "--%s=%s: %s\n"
+
+	if flag.Value.Type() == "string" {
+		format = "--%s='%s': %s\n"
+	}
+
+	if len(flag.Shorthand) > 0 {
+		format = "  -%s, " + format
+	} else {
+		format = "   %s   " + format
+	}
+
+	fmt.Fprintf(x, format, flag.Shorthand, flag.Name, flag.DefValue, flag.Usage)
+
+	return x.String()
+}

cmd/minikube/cmd/root.go

@@ -54,9 +54,9 @@ var dirs = [...]string{
 }
 
 var viperWhiteList = []string{
-	"v",
 	"alsologtostderr",
 	"log_dir",
+	"v",
 }
 
 // RootCmd represents the base command when called without any subcommands
@@ -214,6 +214,7 @@ func init() {
 				logsCmd,
 				updateCheckCmd,
 				versionCmd,
+				optionsCmd,
 			},
 		},
 	}