Remove NotSupported error redundant with NotImplemented (#5074)

cmd/api-errors.go

@@ -114,7 +114,6 @@ const (
 	ErrInvalidQueryParams
 	ErrBucketAlreadyOwnedByYou
 	ErrInvalidDuration
-	ErrNotSupported
 	ErrBucketAlreadyExists
 	ErrMetadataTooLarge
 	ErrUnsupportedMetadata
@@ -748,8 +747,6 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		apiErr = ErrEntityTooLarge
 	case ObjectTooSmall:
 		apiErr = ErrEntityTooSmall
-	case NotSupported:
-		apiErr = ErrNotSupported
 	case NotImplemented:
 		apiErr = ErrNotImplemented
 	case PolicyNotFound:

cmd/api-errors_test.go

@@ -103,10 +103,6 @@ func TestAPIErrCode(t *testing.T) {
 			StorageFull{},
 			ErrStorageFull,
 		},
-		{
-			NotSupported{},
-			ErrNotSupported,
-		},
 		{
 			NotImplemented{},
 			ErrNotImplemented,

cmd/gateway-gcs.go

@@ -825,11 +825,6 @@ func (l *gcsGateway) ListMultipartUploads(bucket string, prefix string, keyMarke
 	}, nil
 }
 
-// CopyObjectPart - copy part of object to other bucket and object
-func (l *gcsGateway) CopyObjectPart(srcBucket string, srcObject string, destBucket string, destObject string, uploadID string, partID int, startOffset int64, length int64) (info PartInfo, err error) {
-	return PartInfo{}, traceError(NotSupported{})
-}
-
 // Checks if minio.sys.tmp/multipart/v1/<upload-id>/gcs.json exists, returns
 // an object layer compatible error upon any error.
 func (l *gcsGateway) checkUploadIDExists(bucket string, key string, uploadID string) error {

cmd/object-api-errors.go

@@ -366,13 +366,6 @@ func (e NotImplemented) Error() string {
 	return "Not Implemented"
 }
 
-// NotSupported If a feature is not supported
-type NotSupported struct{}
-
-func (e NotSupported) Error() string {
-	return "Not Supported"
-}
-
 // PolicyNesting - policy nesting conflict.
 type PolicyNesting struct{}