{"id":6650,"library":"fusepy","title":"fusepy (FUSE Python Bindings)","description":"fusepy provides simple ctypes bindings for the FUSE (Filesystem in Userspace) library, allowing users to implement filesystems entirely in Python. The current version is 3.0.1, primarily focused on Python 3 compatibility and maintenance, with releases occurring infrequently as needed.","status":"active","version":"3.0.1","language":"en","source_language":"en","source_url":"http://github.com/fusepy/fusepy","tags":["filesystem","FUSE","OS-bindings","ctypes","virtual-filesystem"],"install":[{"cmd":"pip install fusepy","lang":"bash","label":"Install fusepy"}],"dependencies":[],"imports":[{"note":"The package is `fusepy` but the installed module is `fuse`.","wrong":"from fusepy import FUSE","symbol":"FUSE","correct":"from fuse import FUSE"},{"note":"The package is `fusepy` but the installed module is `fuse`.","wrong":"from fusepy import Operations","symbol":"Operations","correct":"from fuse import Operations"},{"note":"The package is `fusepy` but the installed module is `fuse`.","wrong":"from fusepy import FuseOSError","symbol":"FuseOSError","correct":"from fuse import FuseOSError"}],"quickstart":{"code":"import os\nimport errno\nimport sys\nfrom stat import S_IFDIR, S_IFREG\nimport time\n\nfrom fuse import FUSE, FuseOSError, Operations\n\n# Define a simple in-memory filesystem\nclass HelloFS(Operations):\n    def __init__(self):\n        self.files = {\n            '/': {\n                'st_mode': (S_IFDIR | 0o755), 'st_nlink': 2, 'st_size': 0,\n                'st_ctime': time.time(), 'st_mtime': time.time(), 'st_atime': time.time()\n            },\n            '/hello.txt': {\n                'st_mode': (S_IFREG | 0o444), 'st_nlink': 1, 'st_size': 13,\n                'st_ctime': time.time(), 'st_mtime': time.time(), 'st_atime': time.time(),\n                'content': b\"Hello FUSE!\\n\"\n            }\n        }\n\n    def getattr(self, path, fh=None):\n        if path not in self.files:\n            raise FuseOSError(errno.ENOENT)\n        \n        # fusepy expects stat-like attributes directly\n        attrs = self.files[path]\n        return {\n            'st_mode': attrs['st_mode'],\n            'st_nlink': attrs['st_nlink'],\n            'st_size': attrs['st_size'],\n            'st_ctime': attrs['st_ctime'],\n            'st_mtime': attrs['st_mtime'],\n            'st_atime': attrs['st_atime'],\n        }\n\n    def readdir(self, path, fh):\n        dirents = ['.', '..']\n        if path == '/':\n            dirents.extend([f.lstrip('/') for f in self.files if f != '/'])\n        for r in dirents:\n            yield r\n\n    def open(self, path, flags):\n        if path not in self.files or 'content' not in self.files[path]:\n            raise FuseOSError(errno.ENOENT)\n        return 0 # FUSE expects a file handle, 0 is often used for in-memory FS\n\n    def read(self, path, size, offset, fh):\n        if path not in self.files or 'content' not in self.files[path]:\n            raise FuseOSError(errno.ENOENT)\n        content = self.files[path]['content']\n        return content[offset:offset + size]\n\nif __name__ == '__main__':\n    # !!! IMPORTANT: You MUST have FUSE development libraries installed on your OS !!!\n    # For Debian/Ubuntu: sudo apt-get install libfuse-dev\n    # For macOS with Homebrew: brew install fuse-t\n\n    # The mount point can be specified as a command-line argument.\n    # Example usage: python your_script.py /tmp/myfuse\n    # To unmount: `fusermount -u /tmp/myfuse` (Linux) or `umount /tmp/myfuse` (macOS/BSD)\n    \n    mount_point = sys.argv[1] if len(sys.argv) > 1 else '/tmp/myfuse_example'\n\n    if not os.path.exists(mount_point):\n        os.makedirs(mount_point)\n    \n    print(f\"Mounting filesystem at {mount_point}. Press Ctrl+C to unmount.\")\n    print(f\"To interact: ls {mount_point}, cat {mount_point}/hello.txt\")\n\n    # The FUSE daemon starts here.\n    # foreground=True keeps the process in the foreground, useful for debugging.\n    # ro=True makes the filesystem read-only.\n    FUSE(HelloFS(), mount_point, foreground=True, ro=True)\n","lang":"python","description":"This quickstart implements a basic, read-only filesystem with a single file '/hello.txt'. To run it, save the code and execute `python your_script.py /tmp/myfuse`. You'll need FUSE development libraries installed on your host system (e.g., `libfuse-dev` on Linux or `fuse-t` via Homebrew on macOS). Access the mounted filesystem with `ls /tmp/myfuse` or `cat /tmp/myfuse/hello.txt`. Press Ctrl+C to unmount, or use `fusermount -u /tmp/myfuse` (Linux) / `umount /tmp/myfuse` (macOS)."},"warnings":[{"fix":"Always use `from fuse import ...` for all classes and functions provided by this library.","message":"The PyPI package is named `fusepy`, but the module you import in your Python code is `fuse` (e.g., `from fuse import FUSE`). Importing from `fusepy` directly will fail.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Ensure your project is running on Python 3.x. For Python 2.x support, you would need to use an older fusepy version (e.g., 2.0.4), which is not recommended due to lack of maintenance.","message":"Starting with version 3.0.0, fusepy officially dropped support for Python 2.x. It is now exclusively compatible with Python 3.","severity":"breaking","affected_versions":">=3.0.0"},{"fix":"Install FUSE development libraries on your system. For Debian/Ubuntu: `sudo apt-get install libfuse-dev`. For macOS (with Homebrew): `brew install fuse-t`.","message":"fusepy is a binding to the FUSE system library, which must be installed on your operating system. Without it, `fusepy` cannot function.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Always unmount your filesystem. If running in the foreground, `Ctrl+C` typically works. Otherwise, use `fusermount -u /path/to/mount` (Linux) or `umount /path/to/mount` (macOS/BSD).","message":"Failing to explicitly unmount a FUSE filesystem can leave a stale mount point, potentially requiring a system reboot or manual cleanup of the mount directory.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Implement proper locking mechanisms (e.g., `threading.Lock`) within your `Operations` class methods if they access or modify shared data structures.","message":"FUSE operations can be concurrent, meaning multiple threads might call your `Operations` class methods simultaneously. Your filesystem implementation must handle thread safety if you modify shared state.","severity":"gotcha","affected_versions":"All versions"}],"env_vars":null,"last_verified":"2026-04-15T00:00:00.000Z","next_check":"2026-07-14T00:00:00.000Z","problems":[]}