DA-515 Add a flag validator

Signed-off-by: Dzianis Andreyenka <andreenkodn@gmail.com>

cmd/init_tezos.go

@@ -43,6 +43,9 @@ var initTezosCmd = &cobra.Command{
 		// By default we turn off multiparty mode while it's not supported yet
 		initOptions.MultipartyEnabled = false
 		initOptions.TokenProviders = []string{}
+		if err := validateTezosFlags(); err != nil {
+			return err
+		}
 		if err := initCommon(args); err != nil {
 			return err
 		}
@@ -56,6 +59,13 @@ var initTezosCmd = &cobra.Command{
 	},
 }
 
+func validateTezosFlags() error {
+	if initOptions.RemoteNodeURL == "" {
+		return fmt.Errorf("you must provide 'remote-node-url' flag as local node mode is not supported")
+	}
+	return nil
+}
+
 func init() {
 	initTezosCmd.Flags().IntVar(&initOptions.BlockPeriod, "block-period", -1, "Block period in seconds. Default is variable based on selected blockchain provider.")
 	initTezosCmd.Flags().StringVar(&initOptions.ContractAddress, "contract-address", "", "Do not automatically deploy a contract, instead use a pre-configured address")