adding kubeconfig command line option

README.md

@@ -85,11 +85,12 @@ At this point this integration only supports standard IAM roles, and is not adva
 
 ## Flags Supported
 ```
-      --context string   context to use for Kubernetes config
-      --gke              enable GKE integration
-  -h, --help             help for rbac-lookup
-  -k, --kind string      filter by this RBAC subject kind (user, group, serviceaccount)
-  -o, --output string    output format (normal, wide)
+      --context string      context to use for Kubernetes config
+      --gke                 enable GKE integration
+  -h, --help                help for rbac-lookup
+  -k, --kind string         filter by this RBAC subject kind (user, group, serviceaccount)
+      --kubeconfig string   config file location
+  -o, --output string       output format (normal, wide)
 ```
 
 ## RBAC Manager

cmd/root.go

@@ -28,6 +28,7 @@ var (
 	commit       string
 	outputFormat string
 	enableGke    bool
+	kubeConfig   string
 	kubeContext  string
 	subjectKind  string
 )
@@ -44,12 +45,13 @@ var rootCmd = &cobra.Command{
 
 		subjectKind = strings.ToLower(subjectKind)
 
-		lookup.List(args, kubeContext, outputFormat, subjectKind, enableGke)
+		lookup.List(args, kubeConfig, kubeContext, outputFormat, subjectKind, enableGke)
 	},
 }
 
 func init() {
 	rootCmd.PersistentFlags().StringVarP(&outputFormat, "output", "o", "", "output format (normal, wide)")
+	rootCmd.PersistentFlags().StringVarP(&kubeConfig, "kubeconfig", "", "", "config file location")
 	rootCmd.PersistentFlags().StringVarP(&kubeContext, "context", "", "", "context to use for Kubernetes config")
 	rootCmd.PersistentFlags().StringVarP(&subjectKind, "kind", "k", "", "filter by this RBAC subject kind (user, group, serviceaccount)")
 	rootCmd.PersistentFlags().BoolVar(&enableGke, "gke", false, "enable GKE integration")

lookup/list.go

@@ -26,8 +26,9 @@ import (
 )
 
 // List outputs rbac bindings where subject names match given string
-func List(args []string, kubeContext, outputFormat, subjectKind string, enableGke bool) {
-	clientConfig := getClientConfig(kubeContext)
+func List(args []string, kubeConfig, kubeContext, outputFormat, subjectKind string, enableGke bool) {
+
+	clientConfig := getClientConfig(kubeConfig, kubeContext)
 
 	kubeconfig, err := clientConfig.ClientConfig()
 	if err != nil {
@@ -73,9 +74,11 @@ func List(args []string, kubeContext, outputFormat, subjectKind string, enableGk
 	l.printRbacBindings(outputFormat)
 }
 
-func getClientConfig(kubeContext string) clientcmd.ClientConfig {
+func getClientConfig(kubeConfig, kubeContext string) clientcmd.ClientConfig {
+	configRules := clientcmd.NewDefaultClientConfigLoadingRules()
+	configRules.ExplicitPath = kubeConfig
 	return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
-		clientcmd.NewDefaultClientConfigLoadingRules(),
+		configRules,
 		&clientcmd.ConfigOverrides{CurrentContext: kubeContext},
 	)
 }