reader, writer, func(warning string) {
					warnings = append(warnings, warning)
				})
			if len(warnings) > 0 {
				fmt.Fprintln(c.ErrOrStderr())
			}
			for _, warning := range warnings {
				fmt.Fprintln(c.ErrOrStderr(), warning)
			}
			return retval
		},
		PersistentPreRunE: func(c *cobra.Command, args []string) error {