Make a cobra Command flag required

Question

I\'ve created a cobra command and added a flag:

cmd.Flags().StringVarP(&primaryIP, \"primary-ip\", \"p\", \"\", \"Help text\")

Is there a w

Answer 1

Late but i hope this help you !

First of all, we need to know that cobra defines two types of flags.

Persistent flags: they will be available to the command and every sub-command under it.

Local flags: they will available only to the specific command which define them.

---

So cobra provides two approaches to make flags required regarding the type of the flag.

On the init function of your command, it could be the root or any other command or sub-command. Lets create a cli app called my-cmd with a sub-command called xD sub-command

// root.go file

var Foo bool

func init() {
    cobra.OnInitialize(initConfig)

    // define required persistent flag
    myCmd.PersistentFlags().BoolVarP(&Foo, "foo", "f", false, "set foo (*)")
    myCmd.MarkPersistentFlagRequired("foo")
}

// subCommand.go file

var Bar string

func init() {
    // just add subCmd as a sub-command of my-cmd
    myCmd.AddCommand(subCmd)

    // define required local flag
    subCmd.Flags().StringVarP(&Bar, "bar", "b", "", "set bar (*)")
    subCmd.MarkFlagRequired("bar")
}

When you call your command in the CLI

# if you don't pass a value for 'foo' flag
> my-cmd
    required flag(s) "foo" not set
    exit status 1

# here you must pass a value for 'foo' because is persistent as well as 'bar' because is local for sub-cmd
> my-cmd sub-cmd
    required flag(s) "foo", "bar" not set
    exit status 1