Issue with temporary files on Windows: `PermissionError: [Errno 13] Permission denied`

[vdmitriyev]

What happens:

• Issue with temporary files on Windows: PermissionError: [Errno 13] Permission denied

Why it happens:

The PermissionError: [Errno 13] Permission denied when dealing with tempfile.NamedTemporaryFile in Pythoncode snippet is a common issue, especially on Windows, and it boils down to how file handles and permissions are managed. Basically it means, this temporary file cannot be used by any other processes/functions, until is will be closed. Thus, before calling copy_to_runtime the file MUST be closed and then MANUALLY deleted upon finish.

Code hotfix (must be applied in session_base.py):

def _run_code() -> ConsoleOutput:
	import tempfile
	import uuid
	from pathlib import Path

	self.install(libraries)
	try:
		with tempfile.NamedTemporaryFile(
			delete=False, # Set delete=False so we can access it after the 'with' block
			suffix=f".{self.language_handler.file_extension}",
			mode="w", # Open in text mode for writing strings directly
			encoding="utf-8"
			) as code_file:
				code_file.write(code)
				temp_file_path = code_file.name # Store the name before the file is closed
		
		code_dest_file = Path(self.config.workdir) / f"{uuid.uuid4().hex}.{self.language_handler.file_extension}"
		self.copy_to_runtime(temp_file_path, str(code_dest_file))

		commands = self.language_handler.get_execution_commands(str(code_dest_file))
		return self.execute_commands(
			commands,
			workdir=self.config.workdir,
		)
	finally:
		# Clean up the temporary file if it was created
		if temp_file_path and Path(temp_file_path).exists():
			import os
			os.remove(temp_file_path)

P.S. I could also prepare a PR with the fix, here is just an issue for others to know that problem exists

[github-actions]

A GitHub issue highlights a common problem on Windows involving tempfile.NamedTemporaryFile in Python, where attempts to use temporary files may result in a PermissionError: [Errno 13] Permission denied. This occurs because, on Windows, temporary files created with NamedTemporaryFile cannot be accessed by other processes while still open. To address this, the file must be explicitly closed and manually deleted afterward. A proposed fix modifies the file-handling logic to use delete=False, ensuring the file remains accessible after the with block, and includes cleanup to safely remove the temporary file afterward. The user offers to submit a pull request with the fix but has shared this issue to raise awareness in the meantime.

[vndee]

Hey @vdmitriyev, it is great if you could help me with the PR.

[vdmitriyev]

Create a PR here - #80

[vdmitriyev]

@vndee sorry, I messed up a bit formatting of other code as well. I hope it is still fine.