Source code for fsspec.fuse

import argparse
import logging
import os
import stat
import threading
import time
from errno import EIO, ENOENT

from fuse import FUSE, FuseOSError, LoggingMixIn, Operations

from fsspec import __version__
from fsspec.core import url_to_fs

logger = logging.getLogger("fsspec.fuse")

class FUSEr(Operations):
    def __init__(self, fs, path, ready_file=False):
        self.fs = fs
        self.cache = {}
        self.root = path.rstrip("/") + "/"
        self.counter = 0"Starting FUSE at %s", path)
        self._ready_file = ready_file

    def getattr(self, path, fh=None):
        logger.debug("getattr %s", path)
        if self._ready_file and path in ["/.fuse_ready", ".fuse_ready"]:
            return {"type": "file", "st_size": 5}

        path = "".join([self.root, path.lstrip("/")]).rstrip("/")
            info =
        except FileNotFoundError:
            raise FuseOSError(ENOENT)

        data = {"st_uid": info.get("uid", 1000), "st_gid": info.get("gid", 1000)}
        perm = info.get("mode", 0o777)

        if info["type"] != "file":
            data["st_mode"] = stat.S_IFDIR | perm
            data["st_size"] = 0
            data["st_blksize"] = 0
            data["st_mode"] = stat.S_IFREG | perm
            data["st_size"] = info["size"]
            data["st_blksize"] = 5 * 2**20
            data["st_nlink"] = 1
        data["st_atime"] = info["atime"] if "atime" in info else time.time()
        data["st_ctime"] = info["ctime"] if "ctime" in info else time.time()
        data["st_mtime"] = info["mtime"] if "mtime" in info else time.time()
        return data

    def readdir(self, path, fh):
        logger.debug("readdir %s", path)
        path = "".join([self.root, path.lstrip("/")])
        files =, False)
        files = [os.path.basename(f.rstrip("/")) for f in files]
        return [".", ".."] + files

    def mkdir(self, path, mode):
        path = "".join([self.root, path.lstrip("/")])
        return 0

    def rmdir(self, path):
        path = "".join([self.root, path.lstrip("/")])
        return 0

    def read(self, path, size, offset, fh):
        logger.debug("read %s", (path, size, offset))
        if self._ready_file and path in ["/.fuse_ready", ".fuse_ready"]:
            # status indicator
            return b"ready"

        f = self.cache[fh]
        out =
        return out

    def write(self, path, data, offset, fh):
        logger.debug("write %s", (path, offset))
        f = self.cache[fh]
        return len(data)

    def create(self, path, flags, fi=None):
        logger.debug("create %s", (path, flags))
        fn = "".join([self.root, path.lstrip("/")])
        self.fs.touch(fn)  # OS will want to get attributes immediately
        f =, "wb")
        self.cache[self.counter] = f
        self.counter += 1
        return self.counter - 1

    def open(self, path, flags):
        logger.debug("open %s", (path, flags))
        fn = "".join([self.root, path.lstrip("/")])
        if flags % 2 == 0:
            # read
            mode = "rb"
            # write/create
            mode = "wb"
        self.cache[self.counter] =, mode)
        self.counter += 1
        return self.counter - 1

    def truncate(self, path, length, fh=None):
        fn = "".join([self.root, path.lstrip("/")])
        if length != 0:
            raise NotImplementedError
        # maybe should be no-op since open with write sets size to zero anyway

    def unlink(self, path):
        fn = "".join([self.root, path.lstrip("/")])
            self.fs.rm(fn, False)
        except (OSError, FileNotFoundError):
            raise FuseOSError(EIO)

    def release(self, path, fh):
            if fh in self.cache:
                f = self.cache[fh]
        except Exception as e:
        return 0

    def chmod(self, path, mode):
        if hasattr(self.fs, "chmod"):
            path = "".join([self.root, path.lstrip("/")])
            return self.fs.chmod(path, mode)
        raise NotImplementedError

[docs] def run( fs, path, mount_point, foreground=True, threads=False, ready_file=False, ops_class=FUSEr, ): """Mount stuff in a local directory This uses fusepy to make it appear as if a given path on an fsspec instance is in fact resident within the local file-system. This requires that fusepy by installed, and that FUSE be available on the system (typically requiring a package to be installed with apt, yum, brew, etc.). Parameters ---------- fs: file-system instance From one of the compatible implementations path: str Location on that file-system to regard as the root directory to mount. Note that you typically should include the terminating "/" character. mount_point: str An empty directory on the local file-system where the contents of the remote path will appear. foreground: bool Whether or not calling this function will block. Operation will typically be more stable if True. threads: bool Whether or not to create threads when responding to file operations within the mounter directory. Operation will typically be more stable if False. ready_file: bool Whether the FUSE process is ready. The ``.fuse_ready`` file will exist in the ``mount_point`` directory if True. Debugging purpose. ops_class: FUSEr or Subclass of FUSEr To override the default behavior of FUSEr. For Example, logging to file. """ func = lambda: FUSE( ops_class(fs, path, ready_file=ready_file), mount_point, nothreads=not threads, foreground=foreground, ) if not foreground: th = threading.Thread(target=func) th.daemon = True th.start() return th else: # pragma: no cover try: func() except KeyboardInterrupt: pass
def main(args): """Mount filesystem from chained URL to MOUNT_POINT. Examples: python3 -m fsspec.fuse memory /usr/share /tmp/mem python3 -m fsspec.fuse local /tmp/source /tmp/local \\ -l /tmp/fsspecfuse.log You can also mount chained-URLs and use special settings: python3 -m fsspec.fuse 'filecache::zip::file://' \\ / /tmp/zip \\ -o 'filecache-cache_storage=/tmp/simplecache' You can specify the type of the setting by using `[int]` or `[bool]`, (`true`, `yes`, `1` represents the Boolean value `True`): python3 -m fsspec.fuse 'simplecache::' \\ /historic/packages/RPMS /tmp/ftp \\ -o 'simplecache-cache_storage=/tmp/simplecache' \\ -o 'simplecache-check_files=false[bool]' \\ -o 'ftp-listings_expiry_time=60[int]' \\ -o 'ftp-username=anonymous' \\ -o 'ftp-password=xieyanbo' """ class RawDescriptionArgumentParser(argparse.ArgumentParser): def format_help(self): usage = super().format_help() parts = usage.split("\n\n") parts[1] = self.description.rstrip() return "\n\n".join(parts) parser = RawDescriptionArgumentParser(prog="fsspec.fuse", description=main.__doc__) parser.add_argument("--version", action="version", version=__version__) parser.add_argument("url", type=str, help="fs url") parser.add_argument("source_path", type=str, help="source directory in fs") parser.add_argument("mount_point", type=str, help="local directory") parser.add_argument( "-o", "--option", action="append", help="Any options of protocol included in the chained URL", ) parser.add_argument( "-l", "--log-file", type=str, help="Logging FUSE debug info (Default: '')" ) parser.add_argument( "-f", "--foreground", action="store_false", help="Running in foreground or not (Default: False)", ) parser.add_argument( "-t", "--threads", action="store_false", help="Running with threads support (Default: False)", ) parser.add_argument( "-r", "--ready-file", action="store_false", help="The `.fuse_ready` file will exist after FUSE is ready. " "(Debugging purpose, Default: False)", ) args = parser.parse_args(args) kwargs = {} for item in args.option or []: key, sep, value = item.partition("=") if not sep: parser.error(message=f"Wrong option: {item!r}") val = value.lower() if val.endswith("[int]"): value = int(value[: -len("[int]")]) elif val.endswith("[bool]"): value = val[: -len("[bool]")] in ["1", "yes", "true"] if "-" in key: fs_name, setting_name = key.split("-", 1) if fs_name in kwargs: kwargs[fs_name][setting_name] = value else: kwargs[fs_name] = {setting_name: value} else: kwargs[key] = value if args.log_file: logging.basicConfig( level=logging.DEBUG, filename=args.log_file, format="%(asctime)s %(message)s", ) class LoggingFUSEr(FUSEr, LoggingMixIn): pass fuser = LoggingFUSEr else: fuser = FUSEr fs, url_path = url_to_fs(args.url, **kwargs) logger.debug("Mounting %s to %s", url_path, str(args.mount_point)) run( fs, args.source_path, args.mount_point, foreground=args.foreground, threads=args.threads, ready_file=args.ready_file, ops_class=fuser, ) if __name__ == "__main__": import sys main(sys.argv[1:])