Add --dry option to view the generated spec without saving (#1504)

pkg/fission-cli/cmd/mqtrigger/command.go

@@ -33,7 +33,7 @@ func Commands() *cobra.Command {
 		Required: []flag.Flag{flag.MqtFnName, flag.MqtTopic},
 		Optional: []flag.Flag{flag.MqtName, flag.MqtMQType, flag.MqtRespTopic,
 			flag.MqtErrorTopic, flag.MqtMaxRetries, flag.MqtMsgContentType,
-			flag.NamespaceFunction, flag.SpecSave},
+			flag.NamespaceFunction, flag.SpecSave, flag.SpecDry},
 	})
 
 	updateCmd := &cobra.Command{

pkg/fission-cli/cmd/mqtrigger/create.go

@@ -147,11 +147,16 @@ func (opts *CreateSubCommand) complete(input cli.Input) error {
 
 func (opts *CreateSubCommand) run(input cli.Input) error {
 	// if we're writing a spec, don't call the API
+	// save to spec file or display the spec to console
+	if input.Bool(flagkey.SpecDry) {
+		return spec.SpecDry(*opts.trigger)
+	}
+
 	if input.Bool(flagkey.SpecSave) {
 		specFile := fmt.Sprintf("mqtrigger-%v.yaml", opts.trigger.ObjectMeta.Name)
 		err := spec.SpecSave(*opts.trigger, specFile)
 		if err != nil {
-			return errors.Wrap(err, "error creating message queue trigger spec")
+			return errors.Wrap(err, "error saving message queue trigger spec")
 		}
 		return nil
 	}