mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-04 13:38:28 +00:00
81 lines
2.0 KiB
Python
81 lines
2.0 KiB
Python
try:
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from trezorio import fatfs, sdcard
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HAVE_SDCARD = True
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is_present = sdcard.is_present
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capacity = sdcard.capacity
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except Exception:
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HAVE_SDCARD = False
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def is_present() -> bool:
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return False
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def capacity() -> int:
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return 0
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from typing import Any, Callable, TypeVar
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from typing_extensions import ParamSpec
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P = ParamSpec("P")
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R = TypeVar("R")
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class FilesystemWrapper:
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_INSTANCE: "FilesystemWrapper | None" = None
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def __init__(self, mounted: bool) -> None:
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if not HAVE_SDCARD:
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raise RuntimeError
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self.mounted = mounted
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self.counter = 0
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@classmethod
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def get_instance(cls, mounted: bool = True) -> "FilesystemWrapper":
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if cls._INSTANCE is None:
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cls._INSTANCE = cls(mounted=mounted)
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if cls._INSTANCE.mounted is not mounted:
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raise RuntimeError # cannot request mounted and non-mounted instance at the same time
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return cls._INSTANCE
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def _deinit_instance(self) -> None:
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fatfs.unmount()
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sdcard.power_off()
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FilesystemWrapper._INSTANCE = None
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def __enter__(self) -> None:
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try:
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if self.counter <= 0:
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self.counter = 0
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sdcard.power_on()
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if self.mounted:
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fatfs.mount()
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self.counter += 1
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except Exception:
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self._deinit_instance()
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raise
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def __exit__(self, exc_type: Any, exc_val: Any, tb: Any) -> None:
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self.counter -= 1
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if self.counter <= 0:
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self.counter = 0
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self._deinit_instance()
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def filesystem(mounted: bool = True) -> FilesystemWrapper:
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return FilesystemWrapper.get_instance(mounted=mounted)
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def with_filesystem(func: Callable[P, R]) -> Callable[P, R]:
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def wrapped_func(*args: P.args, **kwargs: P.kwargs) -> R:
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with filesystem():
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return func(*args, **kwargs)
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return wrapped_func
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