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

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

@@ -31,7 +31,7 @@ func Commands() *cobra.Command {
 	}
 	wrapper.SetFlags(createCmd, flag.FlagSet{
 		Required: []flag.Flag{flag.KwFnName},
-		Optional: []flag.Flag{flag.KwName, flag.KwObjType, flag.KwNamespace, flag.NamespaceFunction, flag.SpecSave},
+		Optional: []flag.Flag{flag.KwName, flag.KwObjType, flag.KwNamespace, flag.NamespaceFunction, flag.SpecSave, flag.SpecDry},
 		// TODO: add label selector flag
 		// flag.KwLabelsFlag
 	})

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

@@ -103,11 +103,16 @@ 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.watcher)
+	}
+
 	if input.Bool(flagkey.SpecSave) {
 		specFile := fmt.Sprintf("kubewatch-%v.yaml", opts.watcher.ObjectMeta.Name)
 		err := spec.SpecSave(*opts.watcher, specFile)
 		if err != nil {
-			return errors.Wrap(err, "error creating kubewatch spec")
+			return errors.Wrap(err, "error saving kubewatch spec")
 		}
 		return nil
 	}