on_truncate Event

Fires when the OS needs to truncate (set the size of) a file.


class FUSETruncateEventParams(object):
  def path() -> str: ...
  def file_context() -> int: ...
  def size() -> int: ...
  def result() -> int: ...
  def result(value) -> None: ...

# In class FUSE:
def on_truncate() -> Callable[[FUSETruncateEventParams], None]: ...
def on_truncate(event_hook: Callable[[FUSETruncateEventParams], None]) -> None: ...


This event fires when the OS wants to set the size of the file, identified by either Path or FileContext.

The Size parameter contains the new file size. If the new size is larger than the old size, the added space is expected to be filled with null bytes ('\0').

The ResultCode parameter will always be 0 when the event is fired. If the event cannot be handled in a "successful" manner for some reason (e.g., a resource isn't available, security checks failed, etc.), set it to a negative error code value (e.g. -ENOENT to indicate that the file does not exist) to report an appropriate error. Please refer to the Error Reporting and Handling topic for more information.

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CBFS FUSE 2020 Python Edition - Version 20.0 [Build 7836]