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mitogen/examples/mitogen-fuse.py

249 lines
6.7 KiB
Python

#!/usr/bin/env python
#
# pip install fusepy
#
# This implementation could improve a /lot/, but the core library is missing
# some functionality (#213) to make that easy. Additionally it needs a set of
# Python bindings for FUSE that stupidly require use of a thread pool.
from __future__ import absolute_import, division
from __future__ import unicode_literals
import errno
import logging
import threading
import sys
import time
import fuse
import mitogen.master
import mitogen.utils
import __main__
import posix
import os
LOG = logging.getLogger(__name__)
def to_text(p):
"""
On 3.x, fusepy returns paths as bytes.
"""
if isinstance(p, bytes):
return p.decode('utf-8')
return p
def errno_wrap(modname, func, *args):
try:
return getattr(globals()[modname], func)(*args), None
except (IOError, OSError):
e = sys.exc_info()[1]
if e.args[0] == errno.ENOENT:
LOG.error('%r(**%r): %s', func, args, e)
else:
LOG.exception('While running %r(**%r)', func, args)
return None, to_text(errno.errorcode[e.args[0]])
def errno_call(context, func, *args):
result, errname = context.call(
errno_wrap,
func.__module__,
func.__name__,
*args
)
if errname:
raise fuse.FuseOSError(getattr(errno, errname))
return result
def _create(path, mode):
fd = os.open(path, os.O_WRONLY)
try:
os.fchmod(fd, mode)
finally:
os.close(fd)
def _stat(path):
st = os.lstat(path)
keys = ('st_atime', 'st_gid', 'st_mode', 'st_mtime', 'st_size', 'st_uid')
dct = dict((key, getattr(st, key)) for key in keys)
dct['has_contents'] = os.path.exists(os.path.join(path, 'Contents'))
return dct
def _listdir(path):
return [
(name, _stat(os.path.join(path, name)), 0)
for name in os.listdir(path)
]
def _read(path, size, offset):
fd = os.open(path, os.O_RDONLY)
try:
os.lseek(fd, offset, os.SEEK_SET)
return os.read(fd, size)
finally:
os.close(fd)
def _truncate(path, length):
fd = os.open(path, os.O_RDWR)
try:
os.truncate(fd, length)
finally:
os.close(fd)
def _write(path, data, offset):
fd = os.open(path, os.O_RDWR)
try:
os.lseek(fd, offset, os.SEEK_SET)
return os.write(fd, data)
finally:
os.close(fd)
def _evil_name(path):
if not (os.path.basename(path).startswith('._') or
path.endswith('.DS_Store')):
return
raise fuse.FuseOSError(errno.ENOENT)
def _chroot(path):
os.chroot(path)
class Operations(fuse.Operations): # fuse.LoggingMixIn,
def __init__(self, host, path='.'):
self.host = host
self.root = path
self.ready = threading.Event()
def init(self, path):
self.broker = mitogen.master.Broker(install_watcher=False)
self.router = mitogen.master.Router(self.broker)
self.host = self.router.ssh(hostname=self.host)
self._context = self.router.sudo(via=self.host)
#self._context.call(_chroot , '/home/dmw')
self._stat_cache = {}
self.ready.set()
def destroy(self, path):
self.broker.shutdown()
@property
def context(self):
self.ready.wait()
return self._context
def chmod(self, path, mode):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, os.chmod, path, mode)
def chown(self, path, uid, gid):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, os.chown, path, uid, gid)
def create(self, path, mode):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, _create, path, mode) or 0
def getattr(self, path, fh=None):
_evil_name(path)
if path in self._stat_cache:
now = time.time()
then, st = self._stat_cache[path]
if now < (then + 2.0):
return st
basedir = os.path.dirname(path)
if path.endswith('/Contents') and basedir in self._stat_cache:
now = time.time()
then, st = self._stat_cache[basedir]
if now < (then + 2.0) and not st['has_contents']:
raise fuse.FuseOSError(errno.ENOENT)
return errno_call(self._context, _stat, path)
def mkdir(self, path, mode):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, os.mkdir, path, mode)
def read(self, path, size, offset, fh):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, _read, path, size, offset)
def readdir(self, path, fh):
_evil_name(path)
lst = errno_call(self._context, _listdir, path)
now = time.time()
for name, stat, _ in lst:
self._stat_cache[os.path.join(path, name)] = (now, stat)
return lst
def readlink(self, path):
_evil_name(path)
return errno_call(self._context, os.readlink, path)
def rename(self, old, new):
old = old.decode(self.encoding)
new = new.decode(self.encoding)
return errno_call(self._context, os.rename, old, new)
# TODO return self.sftp.rename(old, self.root + new)
def rmdir(self, path):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, os.rmdir, path)
def symlink(self, target, source):
target = target.decode(self.encoding)
source = source.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, os.symlink, source, target)
def truncate(self, path, length, fh=None):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, _truncate, path, length)
def unlink(self, path):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, os.unlink, path)
def utimens(self, path, times=None):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, os.utime, path, times)
def write(self, path, data, offset, fh):
path = path.decode(self.encoding)
_evil_name(path)
return errno_call(self._context, _write, path, data, offset)
@mitogen.main(log_level='DEBUG')
def main(router):
if len(sys.argv) != 3:
print('usage: %s <host> <mountpoint>' % sys.argv[0])
sys.exit(1)
blerp = fuse.FUSE(
operations=Operations(sys.argv[1]),
mountpoint=sys.argv[2],
foreground=True,
volname='%s (Mitogen)' % (sys.argv[1],),
)