Graceful exit when no kubeconfig is configured (#1668)

internal/clientsholder/clientsholder.go

@@ -19,6 +19,7 @@ package clientsholder
 import (
 	"errors"
 	"fmt"
+	"os"
 	"time"
 
 	clientconfigv1 "github.com/openshift/client-go/config/clientset/versioned/typed/config/v1"
@@ -146,10 +147,14 @@ func ClearTestClientsHolder() {
 
 // GetClientsHolder returns the singleton ClientsHolder object.
 func GetClientsHolder(filenames ...string) *ClientsHolder {
+	const exitUsage = 2
 	if clientsHolder.ready {
 		return &clientsHolder
 	}
-
+	if len(filenames) == 0 {
+		logrus.Errorf("Please provide a valid kubeconfig. Either set the KUBECONFIG environment variable or alternatively copy a kube config to $HOME/.kube/config")
+		os.Exit(exitUsage)
+	}
 	clientsHolder, err := newClientsHolder(filenames...)
 	if err != nil {
 		logrus.Panic("Failed to create k8s clients holder: ", err)

main.go

@@ -110,11 +110,19 @@ func getK8sClientsConfigFileNames() []string {
 	params := configuration.GetTestParameters()
 	fileNames := []string{}
 	if params.Kubeconfig != "" {
+		// Add the kubeconfig path
 		fileNames = append(fileNames, params.Kubeconfig)
 	}
 	if params.Home != "" {
 		kubeConfigFilePath := filepath.Join(params.Home, ".kube", "config")
-		fileNames = append(fileNames, kubeConfigFilePath)
+		// Check if the kubeconfig path exists
+		if _, err := os.Stat(kubeConfigFilePath); err == nil {
+			log.Infof("kubeconfig path %s is present", kubeConfigFilePath)
+			// Only add the kubeconfig to the list of paths if it exists, since it is not added by the user
+			fileNames = append(fileNames, kubeConfigFilePath)
+		} else {
+			log.Infof("kubeconfig path %s is not present", kubeConfigFilePath)
+		}
 	}
 
 	return fileNames