{"id":7405,"library":"memory-tempfile","title":"Memory Tempfile","description":"memory-tempfile (version 2.2.3) is a Python library that provides helper functions to identify and utilize paths on Linux-based operating systems where RAM-based temporary files can be created. It extends Python's standard `tempfile` module to prioritize memory-backed filesystems like `tmpfs` or `ramfs` for temporary storage, aiming to improve performance by avoiding disk I/O. The project has a stable, albeit infrequent, release history with the current version released in 2019.","status":"active","version":"2.2.3","language":"en","source_language":"en","source_url":"https://github.com/mbello/memory-tempfile","tags":["tempfile","linux","memory","ram","filesystem","performance"],"install":[{"cmd":"pip install memory-tempfile","lang":"bash","label":"Install with pip"}],"dependencies":[],"imports":[{"symbol":"MemoryTempfile","correct":"from memory_tempfile import MemoryTempfile"}],"quickstart":{"code":"from memory_tempfile import MemoryTempfile\nimport os\n\ntempfile_manager = MemoryTempfile()\n\n# Create a temporary file in a memory-backed filesystem\nwith tempfile_manager.TemporaryFile(mode='w+t') as tf:\n    tf.write('Hello from memory tempfile!')\n    tf.seek(0)\n    content = tf.read()\n    print(f\"Read from temp file: {content}\")\n\n# Create a temporary directory in a memory-backed filesystem\nwith tempfile_manager.TemporaryDirectory() as td:\n    print(f\"Temporary directory created at: {td}\")\n    # You can create files inside this directory\n    file_path = os.path.join(td, 'my_data.txt')\n    with open(file_path, 'w') as f:\n        f.write('Data in temp directory.')\n    print(f\"File created in temp directory: {file_path}\")\n# Directory and its contents are automatically removed when exiting the 'with' block","lang":"python","description":"This example demonstrates how to create a temporary file and a temporary directory using `MemoryTempfile`, which will attempt to use a RAM-based filesystem. The resources are automatically cleaned up using context managers."},"warnings":[{"fix":"Ensure deployment on Linux systems. If cross-platform memory-backed temporary storage is needed, consider alternative solutions or platform-specific logic.","message":"The `memory-tempfile` library is currently designed and tested for Linux-only environments. Its core functionality relies on identifying and using specific Linux-based RAM filesystems (e.g., tmpfs, ramfs).","severity":"gotcha","affected_versions":"All versions"},{"fix":"Set `fallback=True` to allow falling back to the default system temporary directory, or provide a specific fallback path (e.g., `fallback='/path/to/disk/temp'`). Check `MemoryTempfile().tempdir` before creating files if `fallback=False` is critical.","message":"If no suitable memory-based filesystem path (like tmpfs or ramfs) is found, and the `fallback` argument to `MemoryTempfile` constructor is set to `False`, a `RuntimeError` will be raised.","severity":"breaking","affected_versions":"All versions"},{"fix":"Account for `{uid}` replacement in path expectations, especially if constructing paths manually or validating them. The resolved path can be accessed via `tempfile_manager.tempdir`.","message":"Paths containing the string `{uid}` (e.g., `/run/user/{uid}`) are automatically replaced by the current user's ID by the library. This behavior is intentional but developers should be aware of this dynamic path resolution.","severity":"gotcha","affected_versions":"All versions"}],"env_vars":null,"last_verified":"2026-04-16T00:00:00.000Z","next_check":"2026-07-15T00:00:00.000Z","problems":[{"fix":"Initialize `MemoryTempfile` with `fallback=True` to allow it to use the system's default temporary directory if a memory-based one isn't available: `tempfile_manager = MemoryTempfile(fallback=True)`. Alternatively, provide a specific fallback path: `tempfile_manager = MemoryTempfile(fallback='/var/tmp')`.","cause":"This error occurs when `memory-tempfile` cannot locate an existing and accessible memory-backed filesystem (like tmpfs or ramfs) to use for temporary files, and the `fallback` option was explicitly set to `False`.","error":"RuntimeError: No suitable memory-based tempdir found"},{"fix":"Verify the permissions of the identified temporary directory (e.g., `/run/user/<your_uid>`, `/dev/shm`) for the user running the Python process. If using custom `preferred_paths` or `additional_paths`, ensure those directories are writable. As a workaround, consider using the `fallback=True` option or specifying a known writable directory via `dir` argument to `TemporaryFile` or `TemporaryDirectory`.","cause":"Despite being a memory-based path, underlying filesystem permissions can still prevent the user from creating or writing files. This could be due to incorrect user permissions or restrictive system configurations.","error":"Permission denied: '/run/user/1000/...' (or similar path)"},{"fix":"Monitor the usage of your memory-based temporary filesystems (e.g., `df -h /dev/shm` on Linux). Ensure proper cleanup of temporary files, especially when not using context managers. If large files are expected, increase the size limit of the tmpfs mount (usually done via `/etc/fstab`) or consider `fallback=True`.","cause":"Even though `memory-tempfile` uses RAM-based filesystems, these filesystems typically have a configured size limit. If too many or too large temporary files are created, this limit can be exhausted, leading to 'no space left' errors.","error":"IOError: [Errno 28] No space left on device"}]}