support mount options in azure file

use JoinMountOptions func

add a new test case

move const vars

fix fmt issue

pkg/volume/azure_file/azure_file.go

@@ -222,11 +222,12 @@ func (b *azureFileMounter) SetUpAt(dir string, fsGroup *int64) error {
 	} else {
 		os.MkdirAll(dir, 0700)
 		// parameters suggested by https://azure.microsoft.com/en-us/documentation/articles/storage-how-to-use-files-linux/
-		options := []string{fmt.Sprintf("vers=3.0,username=%s,password=%s,dir_mode=0700,file_mode=0700", accountName, accountKey)}
+		options := []string{fmt.Sprintf("vers=3.0,username=%s,password=%s", accountName, accountKey)}
 		if b.readOnly {
 			options = append(options, "ro")
 		}
 		mountOptions = volume.JoinMountOptions(b.mountOptions, options)
+		mountOptions = appendDefaultMountOptions(mountOptions)
 	}
 
 	err = b.mounter.Mount(source, dir, "cifs", mountOptions)

pkg/volume/azure_file/azure_file_test.go

@@ -17,9 +17,11 @@ limitations under the License.
 package azure_file
 
 import (
+	"fmt"
 	"io/ioutil"
 	"os"
 	"path"
+	"reflect"
 	"strings"
 	"testing"
 
@@ -358,3 +360,34 @@ func TestGetSecretNameAndNamespaceForPV(t *testing.T) {
 	}
 
 }
+
+func TestAppendDefaultMountOptions(t *testing.T) {
+	tests := []struct {
+		options  []string
+		expected []string
+	}{
+		{
+			options:  []string{"dir_mode=0777"},
+			expected: []string{"dir_mode=0777", fmt.Sprintf("%s=%s", fileModeName, defaultFileMode)},
+		},
+		{
+			options:  []string{"file_mode=0777"},
+			expected: []string{"file_mode=0777", fmt.Sprintf("%s=%s", dirModeName, defaultDirMode)},
+		},
+		{
+			options:  []string{""},
+			expected: []string{"", fmt.Sprintf("%s=%s", fileModeName, defaultFileMode), fmt.Sprintf("%s=%s", dirModeName, defaultDirMode)},
+		},
+		{
+			options:  []string{"file_mode=0777", "dir_mode=0777"},
+			expected: []string{"file_mode=0777", "dir_mode=0777"},
+		},
+	}
+
+	for _, test := range tests {
+		result := appendDefaultMountOptions(test.options)
+		if !reflect.DeepEqual(result, test.expected) {
+			t.Errorf("input: %q, appendDefaultMountOptions result: %q, expected: %q", test.options, result, test.expected)
+		}
+	}
+}

pkg/volume/azure_file/azure_util.go

@@ -18,6 +18,7 @@ package azure_file
 
 import (
 	"fmt"
+	"strings"
 
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
@@ -25,6 +26,13 @@ import (
 	"k8s.io/kubernetes/pkg/volume"
 )
 
+const (
+	fileModeName    = "file_mode"
+	dirModeName     = "dir_mode"
+	defaultFileMode = "700"
+	defaultDirMode  = "700"
+)
+
 // Abstract interface to azure file operations.
 type azureUtil interface {
 	GetAzureCredentials(host volume.VolumeHost, nameSpace, secretName string) (string, string, error)
@@ -84,3 +92,29 @@ func (s *azureSvc) SetAzureCredentials(host volume.VolumeHost, nameSpace, accoun
 	}
 	return secretName, err
 }
+
+// check whether mountOptions contains file_mode and dir_mode, if not, append default mode
+func appendDefaultMountOptions(mountOptions []string) []string {
+	fileModeFlag := false
+	dirModeFlag := false
+
+	for _, mountOption := range mountOptions {
+		if strings.HasPrefix(mountOption, fileModeName) {
+			fileModeFlag = true
+		}
+		if strings.HasPrefix(mountOption, dirModeName) {
+			dirModeFlag = true
+		}
+	}
+
+	allMountOptions := mountOptions
+	if !fileModeFlag {
+		allMountOptions = append(allMountOptions, fmt.Sprintf("%s=%s", fileModeName, defaultFileMode))
+	}
+
+	if !dirModeFlag {
+		allMountOptions = append(allMountOptions, fmt.Sprintf("%s=%s", dirModeName, defaultDirMode))
+	}
+
+	return allMountOptions
+}