clear error on missing kube config (#124)

pkg/kubernetes/kubernetes.go

@@ -6,6 +6,7 @@
 package kubernetes
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"os/exec"
@@ -21,6 +22,11 @@ const daprManifestPath = "https://daprreleases.blob.core.windows.net/manifest/da
 
 // Initialize to deploy the Dapr operator
 func Init() error {
+	kubeExists := kubeconfigExists()
+	if !kubeExists {
+		return errors.New("Can't connect to a Kubernetes cluster. Make sure you have the Kubernetes config file on your machine")
+	}
+
 	msg := "Deploying the Dapr Operator to your cluster..."
 	var s *spinner.Spinner
 
@@ -49,6 +55,11 @@ func Init() error {
 	return nil
 }
 
+func kubeconfigExists() bool {
+	_, err := Client()
+	return err == nil
+}
+
 func runCmdAndWait(name string, args ...string) error {
 	cmd := exec.Command(name, args...)
 	err := cmd.Start()