try os/user.HomeDir when $HOME is unset when find kubeconfig file

Signed-off-by: rick <linuxsuren@users.noreply.github.com>

pkg/models/openpitrix/attachments.go

@@ -15,6 +15,7 @@ package openpitrix
 
 import (
 	"bytes"
+
 	"github.com/go-openapi/strfmt"
 	"k8s.io/klog"
 

pkg/simple/client/k8s/options.go

@@ -18,6 +18,7 @@ package k8s
 
 import (
 	"os"
+	"os/user"
 	"path"
 
 	"k8s.io/client-go/util/homedir"
@@ -54,8 +55,16 @@ func NewKubernetesOptions() (option *KubernetesOptions) {
 	}
 
 	// make it be easier for those who wants to run api-server locally
-	userHomeConfig := path.Join(homedir.HomeDir(), ".kube/config")
-	if _, err := os.Stat(userHomeConfig); !os.IsNotExist(err) {
+	homePath := homedir.HomeDir()
+	if homePath == "" {
+		// try os/user.HomeDir when $HOME is unset.
+		if u, err := user.Current(); err == nil {
+			homePath = u.HomeDir
+		}
+	}
+
+	userHomeConfig := path.Join(homePath, ".kube/config")
+	if _, err := os.Stat(userHomeConfig); err == nil {
 		option.KubeConfig = userHomeConfig
 	}
 	return