mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-15 20:19:23 +00:00
62 lines
1.7 KiB
Python
62 lines
1.7 KiB
Python
from trezorio import fatfs, sdcard
|
|
|
|
if False:
|
|
from typing import Any, Callable, Optional, TypeVar
|
|
|
|
T = TypeVar("T", bound=Callable)
|
|
|
|
|
|
class FilesystemWrapper:
|
|
_INSTANCE = None # type: Optional[FilesystemWrapper]
|
|
|
|
def __init__(self, mounted: bool) -> None:
|
|
self.mounted = mounted
|
|
self.counter = 0
|
|
|
|
@classmethod
|
|
def get_instance(cls, mounted: bool = True) -> "FilesystemWrapper":
|
|
if cls._INSTANCE is None:
|
|
cls._INSTANCE = cls(mounted=mounted)
|
|
if cls._INSTANCE.mounted is not mounted:
|
|
raise RuntimeError # cannot request mounted and non-mounted instance at the same time
|
|
return cls._INSTANCE
|
|
|
|
def _deinit_instance(self) -> None:
|
|
fatfs.unmount()
|
|
sdcard.power_off()
|
|
FilesystemWrapper._INSTANCE = None
|
|
|
|
def __enter__(self) -> None:
|
|
try:
|
|
if self.counter <= 0:
|
|
self.counter = 0
|
|
sdcard.power_on()
|
|
if self.mounted:
|
|
fatfs.mount()
|
|
self.counter += 1
|
|
except Exception:
|
|
self._deinit_instance()
|
|
raise
|
|
|
|
def __exit__(self, exc_type: Any, exc_val: Any, tb: Any) -> None:
|
|
self.counter -= 1
|
|
if self.counter <= 0:
|
|
self.counter = 0
|
|
self._deinit_instance()
|
|
|
|
|
|
def filesystem(mounted: bool = True) -> FilesystemWrapper:
|
|
return FilesystemWrapper.get_instance(mounted=mounted)
|
|
|
|
|
|
def with_filesystem(func: T) -> T:
|
|
def wrapped_func(*args, **kwargs) -> Any: # type: ignore
|
|
with filesystem():
|
|
return func(*args, **kwargs)
|
|
|
|
return wrapped_func # type: ignore
|
|
|
|
|
|
is_present = sdcard.is_present
|
|
capacity = sdcard.capacity
|