fix: handle the initial sequencer (#1027)

cmd/rollapp/setup/setup.go

@@ -139,6 +139,23 @@ func Cmd() *cobra.Command {
 
 			switch nodeType {
 			case "sequencer":
+				canRegister, err := sequencerutils.CanSequencerBeRegisteredForRollapp(
+					raResponse.Rollapp.RollappId,
+					rollerData.HubData,
+				)
+				if err != nil {
+					pterm.Error.Println(
+						"failed to check whether a sequencer can be registered for rollapp: ",
+						err,
+					)
+					return
+				}
+
+				if !canRegister {
+					pterm.Error.Println("rollapp is not ready to register a sequencer")
+					return
+				}
+
 				pterm.Info.Println("getting the existing sequencer address ")
 				hubSeqKC := utils.KeyConfig{
 					Dir:         consts.ConfigDirName.HubKeys,

utils/sequencer/sequencer.go

@@ -87,6 +87,28 @@ func Register(raCfg config.RollappConfig, desiredBond cosmossdktypes.Coin) error
 	return nil
 }
 
+func CanSequencerBeRegisteredForRollapp(raID string, hd consts.HubData) (bool, error) {
+	var raResponse rollapp.ShowRollappResponse
+	cmd := rollapp.GetRollappCmd(raID, hd)
+
+	out, err := bash.ExecCommandWithStdout(cmd)
+	if err != nil {
+		pterm.Error.Println("failed to get rollapp: ", err)
+		return false, err
+	}
+	err = json.Unmarshal(out.Bytes(), &raResponse)
+	if err != nil {
+		pterm.Error.Println("failed to unmarshal", err)
+		return false, err
+	}
+
+	if raResponse.Rollapp.InitialSequencer == "" {
+		return false, nil
+	}
+
+	return true, nil
+}
+
 func isValidSequencerMetadata(path string) (bool, error) {
 	f, err := os.Open(path)
 	if err != nil {