Specifically give a better error message for setlabel on RO fs

1 files changed, 3 insertions, 0 deletions

diff --git a/extmod/vfs_fat.c b/extmod/vfs_fat.c
index 66d3136eb..81ca1e23d 100644
--- a/extmod/vfs_fat.c
+++ b/extmod/vfs_fat.c
@@ -335,6 +335,9 @@ static mp_obj_t vfs_fat_setlabel(mp_obj_t self_in, mp_obj_t label_in) {
     const char *label_str = mp_obj_str_get_str(label_in);
     FRESULT res = f_setlabel(&self->fatfs, label_str);
     if (res != FR_OK) {
+        if(res == FR_WRITE_PROTECTED) {
+            mp_raise_msg(&mp_type_OSError, "Read-only filesystem");
+        }
         mp_raise_OSError(fresult_to_errno_table[res]);
     }
     return mp_const_none;