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
logger.info("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("/")
try:
info = self.fs.info(path)
except FileNotFoundError as exc:
raise FuseOSError(ENOENT) from exc
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
else:
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 = self.fs.ls(path, False)
files = [os.path.basename(f.rstrip("/")) for f in files]
return [".", ".."] + files
def mkdir(self, path, mode):
path = "".join([self.root, path.lstrip("/")])
self.fs.mkdir(path)
return 0
def rmdir(self, path):
path = "".join([self.root, path.lstrip("/")])
self.fs.rmdir(path)
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]
f.seek(offset)
out = f.read(size)
return out
def write(self, path, data, offset, fh):
logger.debug("write %s", (path, offset))
f = self.cache[fh]
f.seek(offset)
f.write(data)
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 = self.fs.open(fn, "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"
else:
# write/create
mode = "wb"
self.cache[self.counter] = self.fs.open(fn, 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
self.fs.touch(fn)
def unlink(self, path):
fn = "".join([self.root, path.lstrip("/")])
try:
self.fs.rm(fn, False)
except (OSError, FileNotFoundError) as exc:
raise FuseOSError(EIO) from exc
def release(self, path, fh):
try:
if fh in self.cache:
f = self.cache[fh]
f.close()
self.cache.pop(fh)
except Exception as e:
print(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
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://data.zip' \\
/ /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::ftp://ftp1.at.proftpd.org' \\
/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:])
