feat(kumactl) install gateway types

app/kumactl/cmd/completion/testdata/zsh.golden

@@ -943,7 +943,7 @@ function _kumactl_install_dns {
 function _kumactl_install_gateway {
   _arguments \
     '--namespace[namespace to install gateway to]:' \
-    '--type[type of gateway to install. Available types: '\''kong'\'']:' \
+    '--type[type of gateway to install. Available types: "kong"]:' \
     '--config-file[path to the configuration file to use]:' \
     '--log-level[log level: one of off|info|debug]:' \
     '(-m --mesh)'{-m,--mesh}'[mesh to use]:'

app/kumactl/cmd/install/context/install_gateway_context.go

@@ -6,13 +6,15 @@ type InstallGatewayArgs struct {
 }
 
 type InstallGatewayContext struct {
-	Args InstallGatewayArgs
+	Args           InstallGatewayArgs
+	AvailableTypes map[string]struct{}
 }
 
 func DefaultInstallGatewayContext() InstallGatewayContext {
 	return InstallGatewayContext{
 		Args: InstallGatewayArgs{
 			Namespace: "kuma-gateway",
 		},
+		AvailableTypes: map[string]struct{}{"kong": {}},
 	}
 }

app/kumactl/cmd/install/install_gateway.go

@@ -1,6 +1,9 @@
 package install
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
@@ -14,14 +17,24 @@ type gatewayTemplateArgs struct {
 	Namespace string
 }
 
+func availableTypesStr(types map[string]struct{}) string {
+	var typesArr []string
+	for typeStr := range types {
+		typesArr = append(typesArr, fmt.Sprintf("%q", typeStr))
+	}
+	return strings.Join(typesArr, ", ")
+}
+
 func newInstallGatewayCmd(ctx *install_context.InstallGatewayContext) *cobra.Command {
 	args := ctx.Args
+	types := ctx.AvailableTypes
+	typesStr := availableTypesStr(types)
 	cmd := &cobra.Command{
 		Use:   "gateway",
 		Short: "Install ingress gateway on Kubernetes",
 		Long:  "Install ingress gateway on Kubernetes in a 'kuma-gateway' namespace.",
 		RunE: func(cmd *cobra.Command, _ []string) error {
-			if err := validateGWArgs(args); err != nil {
+			if err := validateGWArgs(args, types); err != nil {
 				return err
 			}
 
@@ -53,15 +66,16 @@ func newInstallGatewayCmd(ctx *install_context.InstallGatewayContext) *cobra.Com
 			return nil
 		},
 	}
-	cmd.Flags().StringVar(&args.Type, "type", args.Type, "type of gateway to install. Available types: 'kong'")
+	cmd.Flags().StringVar(&args.Type, "type", args.Type, "type of gateway to install. Available types: "+typesStr)
 	_ = cmd.MarkFlagRequired("type")
 	cmd.Flags().StringVar(&args.Namespace, "namespace", args.Namespace, "namespace to install gateway to")
 	return cmd
 }
 
-func validateGWArgs(args install_context.InstallGatewayArgs) error {
-	if args.Type != "kong" {
-		return errors.New("Only gateway type 'kong' currently supported")
+func validateGWArgs(args install_context.InstallGatewayArgs, availableTypes map[string]struct{}) error {
+	if _, ok := availableTypes[args.Type]; !ok {
+		typesStr := availableTypesStr(availableTypes)
+		return errors.New("Unsupported type '" + args.Type + "'. Available types: " + typesStr)
 	}
 	return nil
 }

app/kumactl/cmd/install/install_gateway_test.go

@@ -64,7 +64,7 @@ var _ = Describe("kumactl install gateway", func() {
 			extraArgs: []string{
 				"--type", "invalidtype",
 			},
-			expectedErr: "Only gateway type 'kong' currently supported",
+			expectedErr: "Unsupported type 'invalidtype'. Available types: \"kong\"",
 		}),
 	)