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Add VfsFat.readonly property for getting current state 

Previously the only other way of determining whether the Vfs has been mounted
read-write or read-only appears to be to attempt a write operation and detect a
possible OSError.

It wasn't possible for the user code to keep track of the state of the state
since the boot VM has to decide whether to (re)mount read-write or read-only,
but can't (easily) pass this information on to the runtime VM.
This commit is contained in:
s-ol 2022-12-08 14:30:09 +01:00
parent 295f7b490f
commit 99b8564e8f
2 changed files with 17 additions and 0 deletions
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13
extmod/vfs_fat.c
View File

@ -429,6 +429,18 @@ STATIC mp_obj_t vfs_fat_utime(mp_obj_t vfs_in, mp_obj_t path_in, mp_obj_t times_
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(fat_vfs_utime_obj, vfs_fat_utime);
STATIC mp_obj_t vfs_fat_getreadonly(mp_obj_t self_in) {
fs_user_mount_t *self = MP_OBJ_TO_PTR(self_in);
return mp_obj_new_bool(!filesystem_is_writable_by_python(self));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(fat_vfs_getreadonly_obj, vfs_fat_getreadonly);
STATIC const mp_obj_property_t fat_vfs_readonly_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&fat_vfs_getreadonly_obj,
MP_ROM_NONE,
MP_ROM_NONE},
};
#if MICROPY_FATFS_USE_LABEL
STATIC mp_obj_t vfs_fat_getlabel(mp_obj_t self_in) {
fs_user_mount_t *self = MP_OBJ_TO_PTR(self_in);
@ -481,6 +493,7 @@ STATIC const mp_rom_map_elem_t fat_vfs_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_mount), MP_ROM_PTR(&vfs_fat_mount_obj) },
{ MP_ROM_QSTR(MP_QSTR_umount), MP_ROM_PTR(&fat_vfs_umount_obj) },
{ MP_ROM_QSTR(MP_QSTR_utime), MP_ROM_PTR(&fat_vfs_utime_obj) },
{ MP_ROM_QSTR(MP_QSTR_readonly), MP_ROM_PTR(&fat_vfs_readonly_obj) },
#if MICROPY_FATFS_USE_LABEL
{ MP_ROM_QSTR(MP_QSTR_label), MP_ROM_PTR(&fat_vfs_label_obj) },
#endif

4
shared-bindings/storage/__init__.c
View File

@ -258,6 +258,10 @@ STATIC const mp_rom_map_elem_t storage_module_globals_table[] = {
//| this property can only be set when the device is writable by the
//| microcontroller."""
//| ...
//| readonly: bool
//| """``True`` when the device is mounted as readonly by the microcontroller.
//| This property cannot be changed, use `storage.remount` instead."""
//| ...
//|
//| def mkfs(self) -> None:
//| """Format the block device, deleting any data that may have been there"""