fix: take KUBECONFIG env variable into consideration (#340)

Before, the default value set for the `--kubeconfig` flag prevented the
`KUBECONFIG` env variable to be ever taken into consideration. This
behavior has now been fixed.

If `--kubeconfig` flag is set, it takes precedence over the `KUBECONFIG` env
variable.

fixes #331

Signed-off-by: Patrick Pichler <git@patrickpichler.dev>
Co-authored-by: Patrick Pichler <git@patrickpichler.dev>

cmd/root.go

@@ -17,18 +17,18 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+
 	"github.com/adrg/xdg"
 	"github.com/fatih/color"
-	"github.com/k8sgpt-ai/k8sgpt/cmd/serve"
-	"github.com/k8sgpt-ai/k8sgpt/pkg/util"
 	"github.com/k8sgpt-ai/k8sgpt/cmd/analyze"
 	"github.com/k8sgpt-ai/k8sgpt/cmd/auth"
 	"github.com/k8sgpt-ai/k8sgpt/cmd/filters"
 	"github.com/k8sgpt-ai/k8sgpt/cmd/generate"
 	"github.com/k8sgpt-ai/k8sgpt/cmd/integration"
+	"github.com/k8sgpt-ai/k8sgpt/cmd/serve"
+	"github.com/k8sgpt-ai/k8sgpt/pkg/util"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
-	"k8s.io/client-go/util/homedir"
 )
 
 var (
@@ -63,10 +63,6 @@ func init() {
 
 	cobra.OnInitialize(initConfig)
 
-	var kubeconfigPath string
-	if home := homedir.HomeDir(); home != "" {
-		kubeconfigPath = filepath.Join(home, ".kube", "config")
-	}
 	rootCmd.AddCommand(auth.AuthCmd)
 	rootCmd.AddCommand(analyze.AnalyzeCmd)
 	rootCmd.AddCommand(filters.FiltersCmd)
@@ -75,7 +71,7 @@ func init() {
 	rootCmd.AddCommand(serve.ServeCmd)
 	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.k8sgpt.yaml)")
 	rootCmd.PersistentFlags().StringVar(&kubecontext, "kubecontext", "", "Kubernetes context to use. Only required if out-of-cluster.")
-	rootCmd.PersistentFlags().StringVar(&kubeconfig, "kubeconfig", kubeconfigPath, "Path to a kubeconfig. Only required if out-of-cluster.")
+	rootCmd.PersistentFlags().StringVar(&kubeconfig, "kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
 }
 
 // initConfig reads in config file and ENV variables if set.

pkg/kubernetes/kubernetes.go

@@ -44,8 +44,14 @@ func NewClient(kubecontext string, kubeconfig string) (*Client, error) {
 	var config *rest.Config
 	config, err := rest.InClusterConfig()
 	if err != nil {
+		loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
+
+		if kubeconfig != "" {
+			loadingRules.ExplicitPath = kubeconfig
+		}
+
 		clientConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
-			&clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeconfig},
+			loadingRules,
 			&clientcmd.ConfigOverrides{
 				CurrentContext: kubecontext,
 			})