Add setting to not install namespace on chart_app

This commit allows an app author to not get the chart_app install option
to try to create the namespace. This is useful when namespaces are
created from a yaml file with specific annotations.

Signed-off-by: Alistair Hey <alistair@heyal.co.uk>

cmd/apps/openfaas_app.go

@@ -198,6 +198,7 @@ func MakeInstallOpenFaaS() *cobra.Command {
 			WithHelmURL("https://openfaas.github.io/faas-netes/").
 			WithHelmRepo("openfaas/openfaas").
 			WithNamespace(namespace).
+			WithInstallNamespace(false).
 			WithWait(wait)
 
 		if _, err := apps.MakeInstallChart(appOpts); err != nil {

pkg/apps/chart_app.go

@@ -20,8 +20,10 @@ func MakeInstallChart(options *types.InstallerOptions) (*types.InstallerOutput,
 		return nil, err
 	}
 
-	if err := k8s.CreateNamespace(options.Namespace); err != nil {
-		return nil, err
+	if options.CreateNamespace {
+		if err := k8s.CreateNamespace(options.Namespace); err != nil {
+			return nil, err
+		}
 	}
 
 	for _, secret := range options.Secrets {

pkg/types/types.go

@@ -3,12 +3,13 @@ package types
 import "github.com/alexellis/arkade/pkg/config"
 
 type InstallerOptions struct {
-	Namespace      string
-	KubeconfigPath string
-	NodeArch       string
-	Helm           *HelmConfig
-	Verbose        bool
-	Secrets        []K8sSecret
+	Namespace       string
+	CreateNamespace bool
+	KubeconfigPath  string
+	NodeArch        string
+	Helm            *HelmConfig
+	Verbose         bool
+	Secrets         []K8sSecret
 }
 
 type K8sSecret struct {
@@ -93,11 +94,17 @@ func (o *InstallerOptions) WithSecret(secret K8sSecret) *InstallerOptions {
 	return o
 }
 
+func (o *InstallerOptions) WithInstallNamespace(b bool) *InstallerOptions {
+	o.CreateNamespace = b
+	return o
+}
+
 func DefaultInstallOptions() *InstallerOptions {
 	return &InstallerOptions{
-		Namespace:      "default",
-		KubeconfigPath: config.GetDefaultKubeconfig(),
-		NodeArch:       "x86_64",
+		Namespace:       "default",
+		KubeconfigPath:  config.GetDefaultKubeconfig(),
+		NodeArch:        "x86_64",
+		CreateNamespace: false,
 		Helm: &HelmConfig{
 			Repo: &HelmRepo{
 				Version: "",