chore: combine case insensitive key/value setting in parameters

pkg/smb/controllerserver.go

@@ -110,7 +110,7 @@ func (d *Driver) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest)
 		if err = os.Mkdir(internalVolumePath, 0777); err != nil && !os.IsExist(err) {
 			return nil, status.Errorf(codes.Internal, "failed to make subdirectory: %v", err.Error())
 		}
-		parameters[subDirField] = smbVol.subDir
+		setKeyValueInMap(parameters, subDirField, smbVol.subDir)
 	} else {
 		klog.V(2).Infof("CreateVolume(%s) does not create subdirectory", name)
 	}

pkg/smb/smb.go

@@ -141,3 +141,18 @@ func hasGuestMountOptions(options []string) bool {
 	}
 	return false
 }
+
+// setKeyValueInMap set key/value pair in map
+// key in the map is case insensitive, if key already exists, overwrite existing value
+func setKeyValueInMap(m map[string]string, key, value string) {
+	if m == nil {
+		return
+	}
+	for k := range m {
+		if strings.EqualFold(k, key) {
+			m[k] = value
+			return
+		}
+	}
+	m[key] = value
+}

pkg/smb/smb_test.go

@@ -20,6 +20,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"reflect"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -175,3 +176,57 @@ func TestHasGuestMountOptions(t *testing.T) {
 		}
 	}
 }
+
+func TestSetKeyValueInMap(t *testing.T) {
+	tests := []struct {
+		desc     string
+		m        map[string]string
+		key      string
+		value    string
+		expected map[string]string
+	}{
+		{
+			desc:  "nil map",
+			key:   "key",
+			value: "value",
+		},
+		{
+			desc:     "empty map",
+			m:        map[string]string{},
+			key:      "key",
+			value:    "value",
+			expected: map[string]string{"key": "value"},
+		},
+		{
+			desc:  "non-empty map",
+			m:     map[string]string{"k": "v"},
+			key:   "key",
+			value: "value",
+			expected: map[string]string{
+				"k":   "v",
+				"key": "value",
+			},
+		},
+		{
+			desc:     "same key already exists",
+			m:        map[string]string{"subDir": "value2"},
+			key:      "subDir",
+			value:    "value",
+			expected: map[string]string{"subDir": "value"},
+		},
+		{
+			desc:     "case insentive key already exists",
+			m:        map[string]string{"subDir": "value2"},
+			key:      "subdir",
+			value:    "value",
+			expected: map[string]string{"subDir": "value"},
+		},
+	}
+
+	for _, test := range tests {
+		setKeyValueInMap(test.m, test.key, test.value)
+		if !reflect.DeepEqual(test.m, test.expected) {
+			t.Errorf("test[%s]: unexpected output: %v, expected result: %v", test.desc, test.m, test.expected)
+		}
+	}
+}