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fuse: impl_b: Add impl_b to the contrib directory.

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This commit is contained in:
nejucomo 2008-06-06 22:22:36 -07:00
parent e538651947
commit 2fa5785960
18 changed files with 2948 additions and 0 deletions
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84
contrib/fuse/impl_b/pyfuse/OrderedDict.py Normal file
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from UserDict import DictMixin
DELETED = object()
class OrderedDict(DictMixin):
def __init__(self, *args, **kwds):
self.clear()
self.update(*args, **kwds)
def clear(self):
self._keys = []
self._content = {} # {key: (index, value)}
self._deleted = 0
def copy(self):
return OrderedDict(self)
def __iter__(self):
for key in self._keys:
if key is not DELETED:
yield key
def keys(self):
return [key for key in self._keys if key is not DELETED]
def popitem(self):
while 1:
try:
k = self._keys.pop()
except IndexError:
raise KeyError, 'OrderedDict is empty'
if k is not DELETED:
return k, self._content.pop(k)[1]
def __getitem__(self, key):
index, value = self._content[key]
return value
def __setitem__(self, key, value):
try:
index, oldvalue = self._content[key]
except KeyError:
index = len(self._keys)
self._keys.append(key)
self._content[key] = index, value
def __delitem__(self, key):
index, oldvalue = self._content.pop(key)
self._keys[index] = DELETED
if self._deleted <= len(self._content):
self._deleted += 1
else:
# compress
newkeys = []
for k in self._keys:
if k is not DELETED:
i, value = self._content[k]
self._content[k] = len(newkeys), value
newkeys.append(k)
self._keys = newkeys
self._deleted = 0
def __len__(self):
return len(self._content)
def __repr__(self):
res = ['%r: %r' % (key, self._content[key][1]) for key in self]
return 'OrderedDict(%s)' % (', '.join(res),)
def __cmp__(self, other):
if not isinstance(other, OrderedDict):
return NotImplemented
keys = self.keys()
r = cmp(keys, other.keys())
if r:
return r
for k in keys:
r = cmp(self[k], other[k])
if r:
return r
return 0

0
contrib/fuse/impl_b/pyfuse/__init__.py Normal file
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281
contrib/fuse/impl_b/pyfuse/cachefs.py Normal file
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import os, stat, py, select
import inspect
from objectfs import ObjectFs
BLOCKSIZE = 8192
def remote_runner(BLOCKSIZE):
import sys, select, os, struct
stream = None
while True:
while stream is not None:
iwtd, owtd, ewtd = select.select([0], [1], [])
if iwtd:
break
pos = stream.tell()
data = stream.read(BLOCKSIZE)
res = ('R', path, pos, len(data))
sys.stdout.write('%r\n%s' % (res, data))
if len(data) < BLOCKSIZE:
stream = None
stream = None
msg = eval(sys.stdin.readline())
if msg[0] == 'L':
path = msg[1]
names = os.listdir(path)
res = []
for name in names:
try:
st = os.stat(os.path.join(path, name))
except OSError:
continue
res.append((name, st.st_mode, st.st_size))
res = msg + (res,)
sys.stdout.write('%s\n' % (res,))
elif msg[0] == 'R':
path, pos = msg[1:]
f = open(path, 'rb')
f.seek(pos)
data = f.read(BLOCKSIZE)
res = msg + (len(data),)
sys.stdout.write('%r\n%s' % (res, data))
elif msg[0] == 'S':
path, pos = msg[1:]
stream = open(path, 'rb')
stream.seek(pos)
#elif msg[0] == 'C':
# stream = None
class CacheFs(ObjectFs):
MOUNT_OPTIONS = {'max_read': BLOCKSIZE}
def __init__(self, localdir, remotehost, remotedir):
src = inspect.getsource(remote_runner)
src += '\n\nremote_runner(%d)\n' % BLOCKSIZE
remotecmd = 'python -u -c "exec input()"'
cmdline = [remotehost, remotecmd]
# XXX Unix style quoting
for i in range(len(cmdline)):
cmdline[i] = "'" + cmdline[i].replace("'", "'\\''") + "'"
cmd = 'ssh -C'
cmdline.insert(0, cmd)
child_in, child_out = os.popen2(' '.join(cmdline), bufsize=0)
child_in.write('%r\n' % (src,))
control = Controller(child_in, child_out)
ObjectFs.__init__(self, CacheDir(localdir, remotedir, control))
class Controller:
def __init__(self, child_in, child_out):
self.child_in = child_in
self.child_out = child_out
self.cache = {}
self.streaming = None
def next_answer(self):
answer = eval(self.child_out.readline())
#print 'A', answer
if answer[0] == 'R':
remotefn, pos, length = answer[1:]
data = self.child_out.read(length)
self.cache[remotefn, pos] = data
return answer
def wait_answer(self, query):
self.streaming = None
#print 'Q', query
self.child_in.write('%r\n' % (query,))
while True:
answer = self.next_answer()
if answer[:len(query)] == query:
return answer[len(query):]
def listdir(self, remotedir):
query = ('L', remotedir)
res, = self.wait_answer(query)
return res
def wait_for_block(self, remotefn, pos):
key = remotefn, pos
while key not in self.cache:
self.next_answer()
return self.cache[key]
def peek_for_block(self, remotefn, pos):
key = remotefn, pos
while key not in self.cache:
iwtd, owtd, ewtd = select.select([self.child_out], [], [], 0)
if not iwtd:
return None
self.next_answer()
return self.cache[key]
def cached_block(self, remotefn, pos):
key = remotefn, pos
return self.cache.get(key)
def start_streaming(self, remotefn, pos):
if remotefn != self.streaming:
while (remotefn, pos) in self.cache:
pos += BLOCKSIZE
query = ('S', remotefn, pos)
#print 'Q', query
self.child_in.write('%r\n' % (query,))
self.streaming = remotefn
def read_blocks(self, remotefn, poslist):
lst = ['%r\n' % (('R', remotefn, pos),)
for pos in poslist if (remotefn, pos) not in self.cache]
if lst:
self.streaming = None
#print 'Q', '+ '.join(lst)
self.child_in.write(''.join(lst))
def clear_cache(self, remotefn):
for key in self.cache.keys():
if key[0] == remotefn:
del self.cache[key]
class CacheDir:
def __init__(self, localdir, remotedir, control, size=0):
self.localdir = localdir
self.remotedir = remotedir
self.control = control
self.entries = None
def listdir(self):
if self.entries is None:
self.entries = []
for name, st_mode, st_size in self.control.listdir(self.remotedir):
if stat.S_ISDIR(st_mode):
cls = CacheDir
else:
cls = CacheFile
obj = cls(os.path.join(self.localdir, name),
os.path.join(self.remotedir, name),
self.control,
st_size)
self.entries.append((name, obj))
return self.entries
class CacheFile:
def __init__(self, localfn, remotefn, control, size):
self.localfn = localfn
self.remotefn = remotefn
self.control = control
self.st_size = size
def size(self):
return self.st_size
def read(self):
try:
st = os.stat(self.localfn)
except OSError:
pass
else:
if st.st_size == self.st_size: # fully cached
return open(self.localfn, 'rb')
os.unlink(self.localfn)
lpath = py.path.local(self.partial())
lpath.ensure(file=1)
f = open(self.partial(), 'r+b')
return DumpFile(self, f)
def partial(self):
return self.localfn + '.partial~'
def complete(self):
try:
os.rename(self.partial(), self.localfn)
except OSError:
pass
class DumpFile:
def __init__(self, cf, f):
self.cf = cf
self.f = f
self.pos = 0
def seek(self, npos):
self.pos = npos
def read(self, count):
control = self.cf.control
self.f.seek(self.pos)
buffer = self.f.read(count)
self.pos += len(buffer)
count -= len(buffer)
self.f.seek(0, 2)
curend = self.f.tell()
if count > 0:
while self.pos > curend:
curend &= -BLOCKSIZE
data = control.peek_for_block(self.cf.remotefn, curend)
if data is None:
break
self.f.seek(curend)
self.f.write(data)
curend += len(data)
if len(data) < BLOCKSIZE:
break
start = max(self.pos, curend) & (-BLOCKSIZE)
end = (self.pos + count + BLOCKSIZE-1) & (-BLOCKSIZE)
poslist = range(start, end, BLOCKSIZE)
if self.pos <= curend:
control.start_streaming(self.cf.remotefn, start)
self.f.seek(start)
for p in poslist:
data = control.wait_for_block(self.cf.remotefn, p)
assert self.f.tell() == p
self.f.write(data)
if len(data) < BLOCKSIZE:
break
curend = self.f.tell()
while curend < self.cf.st_size:
curend &= -BLOCKSIZE
data = control.cached_block(self.cf.remotefn, curend)
if data is None:
break
assert self.f.tell() == curend
self.f.write(data)
curend += len(data)
else:
self.cf.complete()
control.clear_cache(self.cf.remotefn)
self.f.seek(self.pos)
buffer += self.f.read(count)
else:
control.read_blocks(self.cf.remotefn, poslist)
result = []
for p in poslist:
data = control.wait_for_block(self.cf.remotefn, p)
result.append(data)
if len(data) < BLOCKSIZE:
break
data = ''.join(result)
buffer += data[self.pos-start:self.pos-start+count]
else:
if self.pos + 60000 > curend:
curend &= -BLOCKSIZE
control.start_streaming(self.cf.remotefn, curend)
return buffer

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contrib/fuse/impl_b/pyfuse/greenhandler.py Normal file
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import sys, os, Queue, atexit
dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
dir = os.path.join(dir, 'pypeers')
if dir not in sys.path:
sys.path.append(dir)
del dir
from greensock import *
import threadchannel
def _read_from_kernel(handler):
while True:
msg = read(handler.fd, handler.MAX_READ)
if not msg:
print >> sys.stderr, "out-kernel connexion closed"
break
autogreenlet(handler.handle_message, msg)
def add_handler(handler):
autogreenlet(_read_from_kernel, handler)
atexit.register(handler.close)
# ____________________________________________________________
THREAD_QUEUE = None
def thread_runner(n):
while True:
#print 'thread runner %d waiting' % n
operation, answer = THREAD_QUEUE.get()
#print 'thread_runner %d: %r' % (n, operation)
try:
res = True, operation()
except Exception:
res = False, sys.exc_info()
#print 'thread_runner %d: got %d bytes' % (n, len(res or ''))
answer.send(res)
def start_bkgnd_thread():
global THREAD_QUEUE, THREAD_LOCK
import thread
threadchannel.startup()
THREAD_LOCK = thread.allocate_lock()
THREAD_QUEUE = Queue.Queue()
for i in range(4):
thread.start_new_thread(thread_runner, (i,))
def wget(*args, **kwds):
from wget import wget
def operation():
kwds['unlock'] = THREAD_LOCK
THREAD_LOCK.acquire()
try:
return wget(*args, **kwds)
finally:
THREAD_LOCK.release()
if THREAD_QUEUE is None:
start_bkgnd_thread()
answer = threadchannel.ThreadChannel()
THREAD_QUEUE.put((operation, answer))
ok, res = answer.receive()
if not ok:
typ, value, tb = res
raise typ, value, tb
#print 'wget returns %d bytes' % (len(res or ''),)
return res

377
contrib/fuse/impl_b/pyfuse/handler.py Normal file
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from kernel import *
import os, errno, sys, stat
def fuse_mount(mountpoint, opts=None):
if not isinstance(mountpoint, str):
raise TypeError
if opts is not None and not isinstance(opts, str):
raise TypeError
import dl
fuse = dl.open('libfuse.so')
if fuse.sym('fuse_mount_compat22'):
fnname = 'fuse_mount_compat22'
else:
fnname = 'fuse_mount' # older versions of libfuse.so
return fuse.call(fnname, mountpoint, opts)
class Handler(object):
__system = os.system
mountpoint = fd = None
__in_header_size = fuse_in_header.calcsize()
__out_header_size = fuse_out_header.calcsize()
MAX_READ = FUSE_MAX_IN
def __init__(self, mountpoint, filesystem, logfile='STDERR', **opts1):
opts = getattr(filesystem, 'MOUNT_OPTIONS', {}).copy()
opts.update(opts1)
if opts:
opts = opts.items()
opts.sort()
opts = ' '.join(['%s=%s' % item for item in opts])
else:
opts = None
fd = fuse_mount(mountpoint, opts)
if fd < 0:
raise IOError("mount failed")
self.fd = fd
if logfile == 'STDERR':
logfile = sys.stderr
self.logfile = logfile
if self.logfile:
print >> self.logfile, '* mounted at', mountpoint
self.mountpoint = mountpoint
self.filesystem = filesystem
self.handles = {}
self.nexth = 1
def __del__(self):
if self.fd is not None:
os.close(self.fd)
self.fd = None
if self.mountpoint:
cmd = "fusermount -u '%s'" % self.mountpoint.replace("'", r"'\''")
self.mountpoint = None
if self.logfile:
print >> self.logfile, '*', cmd
self.__system(cmd)
close = __del__
def loop_forever(self):
while True:
msg = os.read(self.fd, FUSE_MAX_IN)
if not msg:
raise EOFError("out-kernel connection closed")
self.handle_message(msg)
def handle_message(self, msg):
headersize = self.__in_header_size
req = fuse_in_header(msg[:headersize])
assert req.len == len(msg)
name = req.opcode
try:
try:
name = fuse_opcode2name[req.opcode]
meth = getattr(self, name)
except (IndexError, AttributeError):
raise NotImplementedError
#if self.logfile:
# print >> self.logfile, '%s(%d)' % (name, req.nodeid)
reply = meth(req, msg[headersize:])
#if self.logfile:
# print >> self.logfile, ' >>', repr(reply)
except NotImplementedError:
if self.logfile:
print >> self.logfile, '%s: not implemented' % (name,)
self.send_reply(req, err=errno.ENOSYS)
except EnvironmentError, e:
if self.logfile:
print >> self.logfile, '%s: %s' % (name, e)
self.send_reply(req, err = e.errno or errno.ESTALE)
except NoReply:
pass
else:
self.send_reply(req, reply)
def send_reply(self, req, reply=None, err=0):
assert 0 <= err < 1000
if reply is None:
reply = ''
elif not isinstance(reply, str):
reply = reply.pack()
f = fuse_out_header(unique = req.unique,
error = -err,
len = self.__out_header_size + len(reply))
data = f.pack() + reply
while data:
count = os.write(self.fd, data)
if not count:
raise EOFError("in-kernel connection closed")
data = data[count:]
def notsupp_or_ro(self):
if hasattr(self.filesystem, "modified"):
raise IOError(errno.ENOSYS, "not supported")
else:
raise IOError(errno.EROFS, "read-only file system")
# ____________________________________________________________
def FUSE_INIT(self, req, msg):
msg = fuse_init_in_out(msg[:8])
if self.logfile:
print >> self.logfile, 'INIT: %d.%d' % (msg.major, msg.minor)
return fuse_init_in_out(major = FUSE_KERNEL_VERSION,
minor = FUSE_KERNEL_MINOR_VERSION)
def FUSE_GETATTR(self, req, msg):
node = self.filesystem.getnode(req.nodeid)
attr, valid = self.filesystem.getattr(node)
return fuse_attr_out(attr_valid = valid,
attr = attr)
def FUSE_SETATTR(self, req, msg):
if not hasattr(self.filesystem, 'setattr'):
self.notsupp_or_ro()
msg = fuse_setattr_in(msg)
if msg.valid & FATTR_MODE: mode = msg.attr.mode & 0777
else: mode = None
if msg.valid & FATTR_UID: uid = msg.attr.uid
else: uid = None
if msg.valid & FATTR_GID: gid = msg.attr.gid
else: gid = None
if msg.valid & FATTR_SIZE: size = msg.attr.size
else: size = None
if msg.valid & FATTR_ATIME: atime = msg.attr.atime
else: atime = None
if msg.valid & FATTR_MTIME: mtime = msg.attr.mtime
else: mtime = None
node = self.filesystem.getnode(req.nodeid)
self.filesystem.setattr(node, mode, uid, gid,
size, atime, mtime)
attr, valid = self.filesystem.getattr(node)
return fuse_attr_out(attr_valid = valid,
attr = attr)
def FUSE_RELEASE(self, req, msg):
msg = fuse_release_in(msg, truncate=True)
try:
del self.handles[msg.fh]
except KeyError:
raise IOError(errno.EBADF, msg.fh)
FUSE_RELEASEDIR = FUSE_RELEASE
def FUSE_OPENDIR(self, req, msg):
#msg = fuse_open_in(msg)
node = self.filesystem.getnode(req.nodeid)
attr, valid = self.filesystem.getattr(node)
if mode2type(attr.mode) != TYPE_DIR:
raise IOError(errno.ENOTDIR, node)
fh = self.nexth
self.nexth += 1
self.handles[fh] = True, '', node
return fuse_open_out(fh = fh)
def FUSE_READDIR(self, req, msg):
msg = fuse_read_in(msg)
try:
isdir, data, node = self.handles[msg.fh]
if not isdir:
raise KeyError # not a dir handle
except KeyError:
raise IOError(errno.EBADF, msg.fh)
if msg.offset == 0:
# start or rewind
d_entries = []
off = 0
for name, type in self.filesystem.listdir(node):
off += fuse_dirent.calcsize(len(name))
d_entry = fuse_dirent(ino = INVALID_INO,
off = off,
type = type,
name = name)
d_entries.append(d_entry)
data = ''.join([d.pack() for d in d_entries])
self.handles[msg.fh] = True, data, node
return data[msg.offset:msg.offset+msg.size]
def replyentry(self, (subnodeid, valid1)):
subnode = self.filesystem.getnode(subnodeid)
attr, valid2 = self.filesystem.getattr(subnode)
return fuse_entry_out(nodeid = subnodeid,
entry_valid = valid1,
attr_valid = valid2,
attr = attr)
def FUSE_LOOKUP(self, req, msg):
filename = c2pystr(msg)
dirnode = self.filesystem.getnode(req.nodeid)
return self.replyentry(self.filesystem.lookup(dirnode, filename))
def FUSE_OPEN(self, req, msg, mask=os.O_RDONLY|os.O_WRONLY|os.O_RDWR):
msg = fuse_open_in(msg)
node = self.filesystem.getnode(req.nodeid)
attr, valid = self.filesystem.getattr(node)
if mode2type(attr.mode) != TYPE_REG:
raise IOError(errno.EPERM, node)
f = self.filesystem.open(node, msg.flags & mask)
if isinstance(f, tuple):
f, open_flags = f
else:
open_flags = 0
fh = self.nexth
self.nexth += 1
self.handles[fh] = False, f, node
return fuse_open_out(fh = fh, open_flags = open_flags)
def FUSE_READ(self, req, msg):
msg = fuse_read_in(msg)
try:
isdir, f, node = self.handles[msg.fh]
if isdir:
raise KeyError
except KeyError:
raise IOError(errno.EBADF, msg.fh)
f.seek(msg.offset)
return f.read(msg.size)
def FUSE_WRITE(self, req, msg):
if not hasattr(self.filesystem, 'modified'):
raise IOError(errno.EROFS, "read-only file system")
msg, data = fuse_write_in.from_head(msg)
try:
isdir, f, node = self.handles[msg.fh]
if isdir:
raise KeyError
except KeyError:
raise IOError(errno.EBADF, msg.fh)
f.seek(msg.offset)
f.write(data)
self.filesystem.modified(node)
return fuse_write_out(size = len(data))
def FUSE_MKNOD(self, req, msg):
if not hasattr(self.filesystem, 'mknod'):
self.notsupp_or_ro()
msg, filename = fuse_mknod_in.from_param(msg)
node = self.filesystem.getnode(req.nodeid)
return self.replyentry(self.filesystem.mknod(node, filename, msg.mode))
def FUSE_MKDIR(self, req, msg):
if not hasattr(self.filesystem, 'mkdir'):
self.notsupp_or_ro()
msg, filename = fuse_mkdir_in.from_param(msg)
node = self.filesystem.getnode(req.nodeid)
return self.replyentry(self.filesystem.mkdir(node, filename, msg.mode))
def FUSE_SYMLINK(self, req, msg):
if not hasattr(self.filesystem, 'symlink'):
self.notsupp_or_ro()
linkname, target = c2pystr2(msg)
node = self.filesystem.getnode(req.nodeid)
return self.replyentry(self.filesystem.symlink(node, linkname, target))
#def FUSE_LINK(self, req, msg):
# ...
def FUSE_UNLINK(self, req, msg):
if not hasattr(self.filesystem, 'unlink'):
self.notsupp_or_ro()
filename = c2pystr(msg)
node = self.filesystem.getnode(req.nodeid)
self.filesystem.unlink(node, filename)
def FUSE_RMDIR(self, req, msg):
if not hasattr(self.filesystem, 'rmdir'):
self.notsupp_or_ro()
dirname = c2pystr(msg)
node = self.filesystem.getnode(req.nodeid)
self.filesystem.rmdir(node, dirname)
def FUSE_FORGET(self, req, msg):
if hasattr(self.filesystem, 'forget'):
self.filesystem.forget(req.nodeid)
raise NoReply
def FUSE_READLINK(self, req, msg):
if not hasattr(self.filesystem, 'readlink'):
raise IOError(errno.ENOSYS, "readlink not supported")
node = self.filesystem.getnode(req.nodeid)
target = self.filesystem.readlink(node)
return target
def FUSE_RENAME(self, req, msg):
if not hasattr(self.filesystem, 'rename'):
self.notsupp_or_ro()
msg, oldname, newname = fuse_rename_in.from_param2(msg)
oldnode = self.filesystem.getnode(req.nodeid)
newnode = self.filesystem.getnode(msg.newdir)
self.filesystem.rename(oldnode, oldname, newnode, newname)
def getxattrs(self, nodeid):
if not hasattr(self.filesystem, 'getxattrs'):
raise IOError(errno.ENOSYS, "xattrs not supported")
node = self.filesystem.getnode(nodeid)
return self.filesystem.getxattrs(node)
def FUSE_LISTXATTR(self, req, msg):
names = self.getxattrs(req.nodeid).keys()
names = ['user.' + name for name in names]
totalsize = 0
for name in names:
totalsize += len(name)+1
msg = fuse_getxattr_in(msg)
if msg.size > 0:
if msg.size < totalsize:
raise IOError(errno.ERANGE, "buffer too small")
names.append('')
return '\x00'.join(names)
else:
return fuse_getxattr_out(size=totalsize)
def FUSE_GETXATTR(self, req, msg):
xattrs = self.getxattrs(req.nodeid)
msg, name = fuse_getxattr_in.from_param(msg)
if not name.startswith('user.'): # ENODATA == ENOATTR
raise IOError(errno.ENODATA, "only supports 'user.' xattrs, "
"got %r" % (name,))
name = name[5:]
try:
value = xattrs[name]
except KeyError:
raise IOError(errno.ENODATA, "no such xattr") # == ENOATTR
value = str(value)
if msg.size > 0:
if msg.size < len(value):
raise IOError(errno.ERANGE, "buffer too small")
return value
else:
return fuse_getxattr_out(size=len(value))
def FUSE_SETXATTR(self, req, msg):
xattrs = self.getxattrs(req.nodeid)
msg, name, value = fuse_setxattr_in.from_param_head(msg)
assert len(value) == msg.size
# XXX msg.flags ignored
if not name.startswith('user.'): # ENODATA == ENOATTR
raise IOError(errno.ENODATA, "only supports 'user.' xattrs")
name = name[5:]
try:
xattrs[name] = value
except KeyError:
raise IOError(errno.ENODATA, "cannot set xattr") # == ENOATTR
def FUSE_REMOVEXATTR(self, req, msg):
xattrs = self.getxattrs(req.nodeid)
name = c2pystr(msg)
if not name.startswith('user.'): # ENODATA == ENOATTR
raise IOError(errno.ENODATA, "only supports 'user.' xattrs")
name = name[5:]
try:
del xattrs[name]
except KeyError:
raise IOError(errno.ENODATA, "cannot delete xattr") # == ENOATTR
class NoReply(Exception):
pass

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import os, re, urlparse
from handler import Handler
from objectfs import ObjectFs
class Root:
def __init__(self):
self.entries = {'gg': GoogleRoot()}
def listdir(self):
return self.entries.keys()
def join(self, hostname):
if hostname in self.entries:
return self.entries[hostname]
if '.' not in hostname:
raise KeyError
result = HtmlNode('http://%s/' % (hostname,))
self.entries[hostname] = result
return result
class UrlNode:
data = None
def __init__(self, url):
self.url = url
def getdata(self):
if self.data is None:
print self.url
g = os.popen("lynx -source %r" % (self.url,), 'r')
self.data = g.read()
g.close()
return self.data
class HtmlNode(UrlNode):
r_links = re.compile(r'<a\s[^>]*href="([^"]+)"[^>]*>(.*?)</a>',
re.IGNORECASE | re.DOTALL)
r_images = re.compile(r'<img\s[^>]*src="([^"]+[.]jpg)"', re.IGNORECASE)
def format(self, text, index,
TRANSTBL = ''.join([(32<=c<127 and c!=ord('/'))
and chr(c) or '_'
for c in range(256)])):
return text.translate(TRANSTBL)
def listdir(self):
data = self.getdata()
seen = {}
def uniquename(name):
name = self.format(name, len(seen))
if name == '' or name.startswith('.'):
name = '_' + name
basename = name
i = 1
while name in seen:
i += 1
name = '%s_%d' % (basename, i)
seen[name] = True
return name
for link, text in self.r_links.findall(data):
url = urlparse.urljoin(self.url, link)
yield uniquename(text), HtmlNode(url)
for link in self.r_images.findall(data):
text = os.path.basename(link)
url = urlparse.urljoin(self.url, link)
yield uniquename(text), RawNode(url)
yield '.source', RawNode(self.url)
class RawNode(UrlNode):
def read(self):
return self.getdata()
def size(self):
if self.data:
return len(self.data)
else:
return None
class GoogleRoot:
def join(self, query):
return GoogleSearch(query)
class GoogleSearch(HtmlNode):
r_links = re.compile(r'<a\sclass=l\s[^>]*href="([^"]+)"[^>]*>(.*?)</a>',
re.IGNORECASE | re.DOTALL)
def __init__(self, query):
self.url = 'http://www.google.com/search?q=' + query
def format(self, text, index):
text = text.replace('<b>', '').replace('</b>', '')
text = HtmlNode.format(self, text, index)
return '%d. %s' % (index, text)
if __name__ == '__main__':
root = Root()
handler = Handler('/home/arigo/mnt', ObjectFs(root))
handler.loop_forever()

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from struct import pack, unpack, calcsize
import stat
class Struct(object):
__slots__ = []
def __init__(self, data=None, truncate=False, **fields):
if data is not None:
if truncate:
data = data[:self.calcsize()]
self.unpack(data)
for key, value in fields.items():
setattr(self, key, value)
def unpack(self, data):
data = unpack(self.__types__, data)
for key, value in zip(self.__slots__, data):
setattr(self, key, value)
def pack(self):
return pack(self.__types__, *[getattr(self, k, 0)
for k in self.__slots__])
def calcsize(cls):
return calcsize(cls.__types__)
calcsize = classmethod(calcsize)
def __repr__(self):
result = ['%s=%r' % (name, getattr(self, name, None))
for name in self.__slots__]
return '<%s %s>' % (self.__class__.__name__, ', '.join(result))
def from_param(cls, msg):
limit = cls.calcsize()
zero = msg.find('\x00', limit)
assert zero >= 0
return cls(msg[:limit]), msg[limit:zero]
from_param = classmethod(from_param)
def from_param2(cls, msg):
limit = cls.calcsize()
zero1 = msg.find('\x00', limit)
assert zero1 >= 0
zero2 = msg.find('\x00', zero1+1)
assert zero2 >= 0
return cls(msg[:limit]), msg[limit:zero1], msg[zero1+1:zero2]
from_param2 = classmethod(from_param2)
def from_head(cls, msg):
limit = cls.calcsize()
return cls(msg[:limit]), msg[limit:]
from_head = classmethod(from_head)
def from_param_head(cls, msg):
limit = cls.calcsize()
zero = msg.find('\x00', limit)
assert zero >= 0
return cls(msg[:limit]), msg[limit:zero], msg[zero+1:]
from_param_head = classmethod(from_param_head)
class StructWithAttr(Struct):
def unpack(self, data):
limit = -fuse_attr.calcsize()
super(StructWithAttr, self).unpack(data[:limit])
self.attr = fuse_attr(data[limit:])
def pack(self):
return super(StructWithAttr, self).pack() + self.attr.pack()
def calcsize(cls):
return super(StructWithAttr, cls).calcsize() + fuse_attr.calcsize()
calcsize = classmethod(calcsize)
def _mkstruct(name, c, base=Struct):
typ2code = {
'__u32': 'I',
'__s32': 'i',
'__u64': 'Q',
'__s64': 'q'}
slots = []
types = ['=']
for line in c.split('\n'):
line = line.strip()
if line:
line, tail = line.split(';', 1)
typ, nam = line.split()
slots.append(nam)
types.append(typ2code[typ])
cls = type(name, (base,), {'__slots__': slots,
'__types__': ''.join(types)})
globals()[name] = cls
class timeval(object):
def __init__(self, attr1, attr2):
self.sec = attr1
self.nsec = attr2
def __get__(self, obj, typ=None):
if obj is None:
return self
else:
return (getattr(obj, self.sec) +
getattr(obj, self.nsec) * 0.000000001)
def __set__(self, obj, val):
val = int(val * 1000000000)
sec, nsec = divmod(val, 1000000000)
setattr(obj, self.sec, sec)
setattr(obj, self.nsec, nsec)
def __delete__(self, obj):
delattr(obj, self.sec)
delattr(obj, self.nsec)
def _mktimeval(cls, attr1, attr2):
assert attr1.startswith('_')
assert attr2.startswith('_')
tv = timeval(attr1, attr2)
setattr(cls, attr1[1:], tv)
INVALID_INO = 0xFFFFFFFFFFFFFFFF
def mode2type(mode):
return (mode & 0170000) >> 12
TYPE_REG = mode2type(stat.S_IFREG)
TYPE_DIR = mode2type(stat.S_IFDIR)
TYPE_LNK = mode2type(stat.S_IFLNK)
def c2pystr(s):
n = s.find('\x00')
assert n >= 0
return s[:n]
def c2pystr2(s):
first = c2pystr(s)
second = c2pystr(s[len(first)+1:])
return first, second
# ____________________________________________________________
# Version number of this interface
FUSE_KERNEL_VERSION = 7
# Minor version number of this interface
FUSE_KERNEL_MINOR_VERSION = 2
# The node ID of the root inode
FUSE_ROOT_ID = 1
# The major number of the fuse character device
FUSE_MAJOR = 10
# The minor number of the fuse character device
FUSE_MINOR = 229
# Make sure all structures are padded to 64bit boundary, so 32bit
# userspace works under 64bit kernels
_mkstruct('fuse_attr', '''
__u64 ino;
__u64 size;
__u64 blocks;
__u64 _atime;
__u64 _mtime;
__u64 _ctime;
__u32 _atimensec;
__u32 _mtimensec;
__u32 _ctimensec;
__u32 mode;
__u32 nlink;
__u32 uid;
__u32 gid;
__u32 rdev;
''')
_mktimeval(fuse_attr, '_atime', '_atimensec')
_mktimeval(fuse_attr, '_mtime', '_mtimensec')
_mktimeval(fuse_attr, '_ctime', '_ctimensec')
_mkstruct('fuse_kstatfs', '''
__u64 blocks;
__u64 bfree;
__u64 bavail;
__u64 files;
__u64 ffree;
__u32 bsize;
__u32 namelen;
''')
FATTR_MODE = 1 << 0
FATTR_UID = 1 << 1
FATTR_GID = 1 << 2
FATTR_SIZE = 1 << 3
FATTR_ATIME = 1 << 4
FATTR_MTIME = 1 << 5
#
# Flags returned by the OPEN request
#
# FOPEN_DIRECT_IO: bypass page cache for this open file
# FOPEN_KEEP_CACHE: don't invalidate the data cache on open
#
FOPEN_DIRECT_IO = 1 << 0
FOPEN_KEEP_CACHE = 1 << 1
fuse_opcode = {
'FUSE_LOOKUP' : 1,
'FUSE_FORGET' : 2, # no reply
'FUSE_GETATTR' : 3,
'FUSE_SETATTR' : 4,
'FUSE_READLINK' : 5,
'FUSE_SYMLINK' : 6,
'FUSE_MKNOD' : 8,
'FUSE_MKDIR' : 9,
'FUSE_UNLINK' : 10,
'FUSE_RMDIR' : 11,
'FUSE_RENAME' : 12,
'FUSE_LINK' : 13,
'FUSE_OPEN' : 14,
'FUSE_READ' : 15,
'FUSE_WRITE' : 16,
'FUSE_STATFS' : 17,
'FUSE_RELEASE' : 18,
'FUSE_FSYNC' : 20,
'FUSE_SETXATTR' : 21,
'FUSE_GETXATTR' : 22,
'FUSE_LISTXATTR' : 23,
'FUSE_REMOVEXATTR' : 24,
'FUSE_FLUSH' : 25,
'FUSE_INIT' : 26,
'FUSE_OPENDIR' : 27,
'FUSE_READDIR' : 28,
'FUSE_RELEASEDIR' : 29,
'FUSE_FSYNCDIR' : 30,
}
fuse_opcode2name = []
def setup():
for key, value in fuse_opcode.items():
fuse_opcode2name.extend([None] * (value+1 - len(fuse_opcode2name)))
fuse_opcode2name[value] = key
setup()
del setup
# Conservative buffer size for the client
FUSE_MAX_IN = 8192
FUSE_NAME_MAX = 1024
FUSE_SYMLINK_MAX = 4096
FUSE_XATTR_SIZE_MAX = 4096
_mkstruct('fuse_entry_out', """
__u64 nodeid; /* Inode ID */
__u64 generation; /* Inode generation: nodeid:gen must \
be unique for the fs's lifetime */
__u64 _entry_valid; /* Cache timeout for the name */
__u64 _attr_valid; /* Cache timeout for the attributes */
__u32 _entry_valid_nsec;
__u32 _attr_valid_nsec;
""", base=StructWithAttr)
_mktimeval(fuse_entry_out, '_entry_valid', '_entry_valid_nsec')
_mktimeval(fuse_entry_out, '_attr_valid', '_attr_valid_nsec')
_mkstruct('fuse_forget_in', '''
__u64 nlookup;
''')
_mkstruct('fuse_attr_out', '''
__u64 _attr_valid; /* Cache timeout for the attributes */
__u32 _attr_valid_nsec;
__u32 dummy;
''', base=StructWithAttr)
_mktimeval(fuse_attr_out, '_attr_valid', '_attr_valid_nsec')
_mkstruct('fuse_mknod_in', '''
__u32 mode;
__u32 rdev;
''')
_mkstruct('fuse_mkdir_in', '''
__u32 mode;
__u32 padding;
''')
_mkstruct('fuse_rename_in', '''
__u64 newdir;
''')
_mkstruct('fuse_link_in', '''
__u64 oldnodeid;
''')
_mkstruct('fuse_setattr_in', '''
__u32 valid;
__u32 padding;
''', base=StructWithAttr)
_mkstruct('fuse_open_in', '''
__u32 flags;
__u32 padding;
''')
_mkstruct('fuse_open_out', '''
__u64 fh;
__u32 open_flags;
__u32 padding;
''')
_mkstruct('fuse_release_in', '''
__u64 fh;
__u32 flags;
__u32 padding;
''')
_mkstruct('fuse_flush_in', '''
__u64 fh;
__u32 flush_flags;
__u32 padding;
''')
_mkstruct('fuse_read_in', '''
__u64 fh;
__u64 offset;
__u32 size;
__u32 padding;
''')
_mkstruct('fuse_write_in', '''
__u64 fh;
__u64 offset;
__u32 size;
__u32 write_flags;
''')
_mkstruct('fuse_write_out', '''
__u32 size;
__u32 padding;
''')
fuse_statfs_out = fuse_kstatfs
_mkstruct('fuse_fsync_in', '''
__u64 fh;
__u32 fsync_flags;
__u32 padding;
''')
_mkstruct('fuse_setxattr_in', '''
__u32 size;
__u32 flags;
''')
_mkstruct('fuse_getxattr_in', '''
__u32 size;
__u32 padding;
''')
_mkstruct('fuse_getxattr_out', '''
__u32 size;
__u32 padding;
''')
_mkstruct('fuse_init_in_out', '''
__u32 major;
__u32 minor;
''')
_mkstruct('fuse_in_header', '''
__u32 len;
__u32 opcode;
__u64 unique;
__u64 nodeid;
__u32 uid;
__u32 gid;
__u32 pid;
__u32 padding;
''')
_mkstruct('fuse_out_header', '''
__u32 len;
__s32 error;
__u64 unique;
''')
class fuse_dirent(Struct):
__slots__ = ['ino', 'off', 'type', 'name']
def unpack(self, data):
self.ino, self.off, namelen, self.type = struct.unpack('QQII',
data[:24])
self.name = data[24:24+namelen]
assert len(self.name) == namelen
def pack(self):
namelen = len(self.name)
return pack('QQII%ds' % ((namelen+7)&~7,),
self.ino, getattr(self, 'off', 0), namelen,
self.type, self.name)
def calcsize(cls, namelen):
return 24 + ((namelen+7)&~7)
calcsize = classmethod(calcsize)

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from kernel import *
from handler import Handler
import stat, time, os, weakref, errno
from cStringIO import StringIO
class MemoryFS(object):
INFINITE = 86400.0
class Dir(object):
type = TYPE_DIR
def __init__(self, attr):
self.attr = attr
self.contents = {} # { 'filename': Dir()/File()/SymLink() }
class File(object):
type = TYPE_REG
def __init__(self, attr):
self.attr = attr
self.data = StringIO()
class SymLink(object):
type = TYPE_LNK
def __init__(self, attr, target):
self.attr = attr
self.target = target
def __init__(self, root=None):
self.uid = os.getuid()
self.gid = os.getgid()
self.umask = os.umask(0); os.umask(self.umask)
self.root = root or self.Dir(self.newattr(stat.S_IFDIR))
self.root.id = FUSE_ROOT_ID
self.nodes = weakref.WeakValueDictionary()
self.nodes[FUSE_ROOT_ID] = self.root
self.nextid = FUSE_ROOT_ID + 1
def newattr(self, s, ino=None, mode=0666):
now = time.time()
attr = fuse_attr(size = 0,
mode = s | (mode & ~self.umask),
nlink = 1, # even on dirs! this confuses 'find' in
# a good way :-)
atime = now,
mtime = now,
ctime = now,
uid = self.uid,
gid = self.gid)
if ino is None:
ino = id(attr)
if ino < 0:
ino = ~ino
attr.ino = ino
return attr
def getnode(self, id):
return self.nodes[id]
def modified(self, node):
node.attr.mtime = node.attr.atime = time.time()
if isinstance(node, self.File):
node.data.seek(0, 2)
node.attr.size = node.data.tell()
def getattr(self, node):
return node.attr, self.INFINITE
def setattr(self, node, mode, uid, gid, size, atime, mtime):
if mode is not None:
node.attr.mode = (node.attr.mode & ~0777) | (mode & 0777)
if uid is not None:
node.attr.uid = uid
if gid is not None:
node.attr.gid = gid
if size is not None:
assert isinstance(node, self.File)
node.data.seek(0, 2)
oldsize = node.data.tell()
if size < oldsize:
node.data.seek(size)
node.data.truncate()
self.modified(node)
elif size > oldsize:
node.data.write('\x00' * (size - oldsize))
self.modified(node)
if atime is not None:
node.attr.atime = atime
if mtime is not None:
node.attr.mtime = mtime
def listdir(self, node):
assert isinstance(node, self.Dir)
for name, subobj in node.contents.items():
yield name, subobj.type
def lookup(self, dirnode, filename):
try:
return dirnode.contents[filename].id, self.INFINITE
except KeyError:
raise IOError(errno.ENOENT, filename)
def open(self, filenode, flags):
return filenode.data
def newnodeid(self, newnode):
id = self.nextid
self.nextid += 1
newnode.id = id
self.nodes[id] = newnode
return id
def mknod(self, dirnode, filename, mode):
node = self.File(self.newattr(stat.S_IFREG, mode=mode))
dirnode.contents[filename] = node
return self.newnodeid(node), self.INFINITE
def mkdir(self, dirnode, subdirname, mode):
node = self.Dir(self.newattr(stat.S_IFDIR, mode=mode))
dirnode.contents[subdirname] = node
return self.newnodeid(node), self.INFINITE
def symlink(self, dirnode, linkname, target):
node = self.SymLink(self.newattr(stat.S_IFLNK), target)
dirnode.contents[linkname] = node
return self.newnodeid(node), self.INFINITE
def unlink(self, dirnode, filename):
del dirnode.contents[filename]
rmdir = unlink
def readlink(self, symlinknode):
return symlinknode.target
def rename(self, olddirnode, oldname, newdirnode, newname):
node = olddirnode.contents[oldname]
newdirnode.contents[newname] = node
del olddirnode.contents[oldname]
def getxattrs(self, node):
try:
return node.xattrs
except AttributeError:
node.xattrs = {}
return node.xattrs
if __name__ == '__main__':
import sys
mountpoint = sys.argv[1]
memoryfs = MemoryFS()
handler = Handler(mountpoint, memoryfs)
handler.loop_forever()

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"""
For reading and caching from slow file system (e.g. DVDs or network).
python mirrorfs.py <sourcedir> <cachedir> <mountpoint>
Makes <mountpoint> show a read-only copy of the files in <sourcedir>,
caching all data ever read in the <cachedir> to avoid reading it
twice. This script also features optimistic read-ahead: once a
file is accessed, and as long as no other file is accessed, the
whole file is read and cached as fast as the <sourcedir> will
provide it.
You have to clean up <cachedir> manually before mounting a modified
or different <sourcedir>.
"""
import sys, os, posixpath, stat
try:
__file__
except NameError:
__file__ = sys.argv[0]
this_dir = os.path.dirname(os.path.abspath(__file__))
# ____________________________________________________________
sys.path.append(os.path.dirname(this_dir))
from blockfs import valuetree
from handler import Handler
import greenhandler, greensock
from objectfs import ObjectFs
BLOCKSIZE = 65536
class MirrorFS(ObjectFs):
rawfd = None
def __init__(self, srcdir, cachedir):
self.srcdir = srcdir
self.cachedir = cachedir
self.table = valuetree.ValueTree(os.path.join(cachedir, 'table'), 'q')
if '' not in self.table:
self.initial_read_dir('')
self.table[''] = -1,
try:
self.rawfile = open(os.path.join(cachedir, 'raw'), 'r+b')
except IOError:
self.rawfile = open(os.path.join(cachedir, 'raw'), 'w+b')
ObjectFs.__init__(self, DirNode(self, ''))
self.readahead_at = None
greenhandler.autogreenlet(self.readahead)
def close(self):
self.table.close()
def readahead(self):
while True:
greensock.sleep(0.001)
while not self.readahead_at:
greensock.sleep(1)
path, blocknum = self.readahead_at
self.readahead_at = None
try:
self.readblock(path, blocknum, really=False)
except EOFError:
pass
def initial_read_dir(self, path):
print 'Reading initial directory structure...', path
dirname = os.path.join(self.srcdir, path)
for name in os.listdir(dirname):
filename = os.path.join(dirname, name)
st = os.stat(filename)
if stat.S_ISDIR(st.st_mode):
self.initial_read_dir(posixpath.join(path, name))
q = -1
else:
q = st.st_size
self.table[posixpath.join(path, name)] = q,
def __getitem__(self, key):
self.tablelock.acquire()
try:
return self.table[key]
finally:
self.tablelock.release()
def readblock(self, path, blocknum, really=True):
s = '%s/%d' % (path, blocknum)
try:
q, = self.table[s]
except KeyError:
print s
self.readahead_at = None
f = open(os.path.join(self.srcdir, path), 'rb')
f.seek(blocknum * BLOCKSIZE)
data = f.read(BLOCKSIZE)
f.close()
if not data:
q = -2
else:
data += '\x00' * (BLOCKSIZE - len(data))
self.rawfile.seek(0, 2)
q = self.rawfile.tell()
self.rawfile.write(data)
self.table[s] = q,
if q == -2:
raise EOFError
else:
if q == -2:
raise EOFError
if really:
self.rawfile.seek(q, 0)
data = self.rawfile.read(BLOCKSIZE)
else:
data = None
if self.readahead_at is None:
self.readahead_at = path, blocknum + 1
return data
class Node(object):
def __init__(self, mfs, path):
self.mfs = mfs
self.path = path
class DirNode(Node):
def join(self, name):
path = posixpath.join(self.path, name)
q, = self.mfs.table[path]
if q == -1:
return DirNode(self.mfs, path)
else:
return FileNode(self.mfs, path)
def listdir(self):
result = []
for key, value in self.mfs.table.iteritemsfrom(self.path):
if not key.startswith(self.path):
break
tail = key[len(self.path):].lstrip('/')
if tail and '/' not in tail:
result.append(tail)
return result
class FileNode(Node):
def size(self):
q, = self.mfs.table[self.path]
return q
def read(self):
return FileStream(self.mfs, self.path)
class FileStream(object):
def __init__(self, mfs, path):
self.mfs = mfs
self.path = path
self.pos = 0
self.size, = self.mfs.table[path]
def seek(self, p):
self.pos = p
def read(self, count):
result = []
end = min(self.pos + count, self.size)
while self.pos < end:
blocknum, offset = divmod(self.pos, BLOCKSIZE)
data = self.mfs.readblock(self.path, blocknum)
data = data[offset:]
data = data[:end - self.pos]
assert len(data) > 0
result.append(data)
self.pos += len(data)
return ''.join(result)
# ____________________________________________________________
if __name__ == '__main__':
import sys
srcdir, cachedir, mountpoint = sys.argv[1:]
mirrorfs = MirrorFS(srcdir, cachedir)
try:
handler = Handler(mountpoint, mirrorfs)
greenhandler.add_handler(handler)
greenhandler.mainloop()
finally:
mirrorfs.close()

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from kernel import *
import stat, errno, os, time
from cStringIO import StringIO
from OrderedDict import OrderedDict
class ObjectFs:
"""A simple read-only file system based on Python objects.
Interface of Directory objects:
* join(name) returns a file or subdirectory object
* listdir() returns a list of names, or a list of (name, object)
join() is optional if listdir() returns a list of (name, object).
Alternatively, Directory objects can be plain dictionaries {name: object}.
Interface of File objects:
* size() returns the size
* read() returns the data
Alternatively, File objects can be plain strings.
Interface of SymLink objects:
* readlink() returns the symlink's target, as a string
"""
INFINITE = 86400.0
USE_DIR_CACHE = True
def __init__(self, rootnode):
self.nodes = {FUSE_ROOT_ID: rootnode}
if self.USE_DIR_CACHE:
self.dircache = {}
self.starttime = time.time()
self.uid = os.getuid()
self.gid = os.getgid()
self.umask = os.umask(0); os.umask(self.umask)
def newattr(self, s, ino, mode=0666):
if ino < 0:
ino = ~ino
return fuse_attr(ino = ino,
size = 0,
mode = s | (mode & ~self.umask),
nlink = 1, # even on dirs! this confuses 'find' in
# a good way :-)
atime = self.starttime,
mtime = self.starttime,
ctime = self.starttime,
uid = self.uid,
gid = self.gid)
def getnode(self, nodeid):
try:
return self.nodes[nodeid]
except KeyError:
raise IOError(errno.ESTALE, nodeid)
def getattr(self, node):
timeout = self.INFINITE
if isinstance(node, str):
attr = self.newattr(stat.S_IFREG, id(node))
attr.size = len(node)
elif hasattr(node, 'readlink'):
target = node.readlink()
attr = self.newattr(stat.S_IFLNK, id(node))
attr.size = len(target)
attr.mode |= 0777
elif hasattr(node, 'size'):
sz = node.size()
attr = self.newattr(stat.S_IFREG, id(node))
if sz is None:
timeout = 0
else:
attr.size = sz
else:
attr = self.newattr(stat.S_IFDIR, id(node), mode=0777)
#print 'getattr(%s) -> %s, %s' % (node, attr, timeout)
return attr, timeout
def getentries(self, node):
if isinstance(node, dict):
return node
try:
if not self.USE_DIR_CACHE:
raise KeyError
return self.dircache[node]
except KeyError:
entries = OrderedDict()
if hasattr(node, 'listdir'):
for name in node.listdir():
if isinstance(name, tuple):
name, subnode = name
else:
subnode = None
entries[name] = subnode
if self.USE_DIR_CACHE:
self.dircache[node] = entries
return entries
def listdir(self, node):
entries = self.getentries(node)
for name, subnode in entries.items():
if subnode is None:
subnode = node.join(name)
self.nodes[uid(subnode)] = subnode
entries[name] = subnode
if isinstance(subnode, str):
yield name, TYPE_REG
elif hasattr(subnode, 'readlink'):
yield name, TYPE_LNK
elif hasattr(subnode, 'size'):
yield name, TYPE_REG
else:
yield name, TYPE_DIR
def lookup(self, node, name):
entries = self.getentries(node)
try:
subnode = entries.get(name)
if subnode is None:
if hasattr(node, 'join'):
subnode = node.join(name)
entries[name] = subnode
else:
raise KeyError
except KeyError:
raise IOError(errno.ENOENT, name)
else:
return self.reply(subnode)
def reply(self, node):
res = uid(node)
self.nodes[res] = node
return res, self.INFINITE
def open(self, node, mode):
if not isinstance(node, str):
node = node.read()
if not hasattr(node, 'read'):
node = StringIO(node)
return node
def readlink(self, node):
return node.readlink()
def getxattrs(self, node):
return getattr(node, '__dict__', {})
# ____________________________________________________________
import struct
try:
HUGEVAL = 256 ** struct.calcsize('P')
except struct.error:
HUGEVAL = 0
def fixid(result):
if result < 0:
result += HUGEVAL
return result
def uid(obj):
"""
Return the id of an object as an unsigned number so that its hex
representation makes sense
"""
return fixid(id(obj))
class SymLink(object):
def __init__(self, target):
self.target = target
def readlink(self):
return self.target

63
contrib/fuse/impl_b/pyfuse/pairtype.py Normal file
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"""
Two magic tricks for classes:
class X:
__metaclass__ = extendabletype
...
# in some other file...
class __extend__(X):
... # and here you can add new methods and class attributes to X
Mostly useful together with the second trick, which lets you build
methods whose 'self' is a pair of objects instead of just one:
class __extend__(pairtype(X, Y)):
attribute = 42
def method((x, y), other, arguments):
...
pair(x, y).attribute
pair(x, y).method(other, arguments)
This finds methods and class attributes based on the actual
class of both objects that go into the pair(), with the usual
rules of method/attribute overriding in (pairs of) subclasses.
For more information, see test_pairtype.
"""
class extendabletype(type):
"""A type with a syntax trick: 'class __extend__(t)' actually extends
the definition of 't' instead of creating a new subclass."""
def __new__(cls, name, bases, dict):
if name == '__extend__':
for cls in bases:
for key, value in dict.items():
if key == '__module__':
continue
# XXX do we need to provide something more for pickling?
setattr(cls, key, value)
return None
else:
return super(extendabletype, cls).__new__(cls, name, bases, dict)
def pair(a, b):
"""Return a pair object."""
tp = pairtype(a.__class__, b.__class__)
return tp((a, b)) # tp is a subclass of tuple
pairtypecache = {}
def pairtype(cls1, cls2):
"""type(pair(a,b)) is pairtype(a.__class__, b.__class__)."""
try:
pair = pairtypecache[cls1, cls2]
except KeyError:
name = 'pairtype(%s, %s)' % (cls1.__name__, cls2.__name__)
bases1 = [pairtype(base1, cls2) for base1 in cls1.__bases__]
bases2 = [pairtype(cls1, base2) for base2 in cls2.__bases__]
bases = tuple(bases1 + bases2) or (tuple,) # 'tuple': ultimate base
pair = pairtypecache[cls1, cls2] = extendabletype(name, bases, {})
return pair

92
contrib/fuse/impl_b/pyfuse/pathfs.py Normal file
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from kernel import *
import errno, posixpath, os
class PathFs(object):
"""Base class for a read-write FUSE file system interface
whose underlying content is best accessed with '/'-separated
string paths.
"""
uid = os.getuid()
gid = os.getgid()
umask = os.umask(0); os.umask(umask)
timeout = 86400.0
def __init__(self, root=''):
self._paths = {FUSE_ROOT_ID: root}
self._path2id = {root: FUSE_ROOT_ID}
self._nextid = FUSE_ROOT_ID + 1
def getnode(self, nodeid):
try:
return self._paths[nodeid]
except KeyError:
raise IOError(errno.ESTALE, nodeid)
def forget(self, nodeid):
try:
p = self._paths.pop(nodeid)
del self._path2id[p]
except KeyError:
pass
def cachepath(self, path):
if path in self._path2id:
return self._path2id[path]
id = self._nextid
self._nextid += 1
self._paths[id] = path
self._path2id[path] = id
return id
def mkattr(self, path, size, st_kind, mode, time):
attr = fuse_attr(ino = self._path2id[path],
size = size,
mode = st_kind | (mode & ~self.umask),
nlink = 1, # even on dirs! this confuses 'find' in
# a good way :-)
atime = time,
mtime = time,
ctime = time,
uid = self.uid,
gid = self.gid)
return attr, self.timeout
def lookup(self, path, name):
npath = posixpath.join(path, name)
if not self.check_path(npath):
raise IOError(errno.ENOENT, name)
return self.cachepath(npath), self.timeout
def mknod(self, path, name, mode):
npath = posixpath.join(path, name)
self.mknod_path(npath, mode)
return self.cachepath(npath), self.timeout
def mkdir(self, path, name, mode):
npath = posixpath.join(path, name)
self.mkdir_path(npath, mode)
return self.cachepath(npath), self.timeout
def unlink(self, path, name):
npath = posixpath.join(path, name)
self.unlink_path(npath)
def rmdir(self, path, name):
npath = posixpath.join(path, name)
self.rmdir_path(npath)
def rename(self, oldpath, oldname, newpath, newname):
noldpath = posixpath.join(oldpath, oldname)
nnewpath = posixpath.join(newpath, newname)
if not self.rename_path(noldpath, nnewpath):
raise IOError(errno.ENOENT, oldname)
# fix all paths in the cache
N = len(noldpath)
for id, path in self._paths.items():
if path.startswith(noldpath):
if len(path) == N or path[N] == '/':
del self._path2id[path]
path = nnewpath + path[N:]
self._paths[id] = path
self._path2id[path] = id

181
contrib/fuse/impl_b/pyfuse/pysvnfs.py Normal file
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from kernel import *
import errno, posixpath, weakref
from time import time as now
from stat import S_IFDIR, S_IFREG, S_IFMT
from cStringIO import StringIO
from handler import Handler
from pathfs import PathFs
from pysvn.ra_filesystem import SvnRepositoryFilesystem
import pysvn.date
class SvnFS(PathFs):
def __init__(self, svnurl, root=''):
super(SvnFS, self).__init__(root)
self.svnurl = svnurl
self.openfiles = weakref.WeakValueDictionary()
self.creationtimes = {}
self.do_open()
def do_open(self, rev='HEAD'):
self.fs = SvnRepositoryFilesystem(svnurl, rev)
def do_commit(self, msg):
rev = self.fs.commit(msg)
if rev is None:
print '* no changes.'
else:
print '* checked in revision %d.' % (rev,)
self.do_open()
def do_status(self, path=''):
print '* status'
result = []
if path and not path.endswith('/'):
path += '/'
for delta in self.fs._compute_deltas():
if delta.path.startswith(path):
if delta.oldrev is None:
c = 'A'
elif delta.newrev is None:
c = 'D'
else:
c = 'M'
result.append(' %s %s\n' % (c, delta.path[len(path):]))
return ''.join(result)
def getattr(self, path):
stat = self.fs.stat(path)
if stat['svn:entry:kind'] == 'dir':
s = S_IFDIR
mode = 0777
else:
s = S_IFREG
mode = 0666
try:
time = pysvn.date.decode(stat['svn:entry:committed-date'])
except KeyError:
try:
time = self.creationtimes[path]
except KeyError:
time = self.creationtimes[path] = now()
return self.mkattr(path,
size = stat.get('svn:entry:size', 0),
st_kind = s,
mode = mode,
time = time)
def setattr(self, path, mode, uid, gid, size, atime, mtime):
if size is not None:
data = self.fs.read(path)
if size < len(data):
self.fs.write(path, data[:size])
elif size > len(data):
self.fs.write(path, data + '\x00' * (size - len(data)))
def listdir(self, path):
for name in self.fs.listdir(path):
kind = self.fs.check_path(posixpath.join(path, name))
if kind == 'dir':
yield name, TYPE_DIR
else:
yield name, TYPE_REG
def check_path(self, path):
kind = self.fs.check_path(path)
return kind is not None
def open(self, path, mode):
try:
of = self.openfiles[path]
except KeyError:
of = self.openfiles[path] = OpenFile(self.fs.read(path))
return of, FOPEN_KEEP_CACHE
def modified(self, path):
try:
of = self.openfiles[path]
except KeyError:
pass
else:
self.fs.write(path, of.f.getvalue())
def mknod_path(self, path, mode):
self.fs.add(path)
def mkdir_path(self, path, mode):
self.fs.mkdir(path)
def unlink_path(self, path):
self.fs.unlink(path)
def rmdir_path(self, path):
self.fs.rmdir(path)
def rename_path(self, oldpath, newpath):
kind = self.fs.check_path(oldpath)
if kind is None:
return False
self.fs.move(oldpath, newpath, kind)
return True
def getxattrs(self, path):
return XAttrs(self, path)
class OpenFile:
def __init__(self, data=''):
self.f = StringIO()
self.f.write(data)
self.f.seek(0)
def seek(self, pos):
self.f.seek(pos)
def read(self, sz):
return self.f.read(sz)
def write(self, buf):
self.f.write(buf)
class XAttrs:
def __init__(self, svnfs, path):
self.svnfs = svnfs
self.path = path
def keys(self):
return []
def __getitem__(self, key):
if key == 'status':
return self.svnfs.do_status(self.path)
raise KeyError(key)
def __setitem__(self, key, value):
if key == 'commit' and self.path == '':
self.svnfs.do_commit(value)
elif key == 'update' and self.path == '':
if self.svnfs.fs.modified():
raise IOError(errno.EPERM, "there are local changes")
if value == '':
rev = 'HEAD'
else:
try:
rev = int(value)
except ValueError:
raise IOError(errno.EPERM, "invalid revision number")
self.svnfs.do_open(rev)
else:
raise KeyError(key)
def __delitem__(self, key):
raise KeyError(key)
if __name__ == '__main__':
import sys
svnurl, mountpoint = sys.argv[1:]
handler = Handler(mountpoint, SvnFS(svnurl))
handler.loop_forever()

142
contrib/fuse/impl_b/pyfuse/r_svnfs.py Normal file
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"""
A read-only svn fs showing all the revisions in subdirectories.
"""
from objectfs import ObjectFs, SymLink
from handler import Handler
from pysvn.ra import connect
from pysvn.date import decode
import errno, posixpath, time
#USE_SYMLINKS = 0 # they are wrong if the original file had another path
# use getfattr -d filename to see the node's attributes, which include
# information like the revision at which the file was last modified
class Root:
def __init__(self, svnurl):
self.svnurl = svnurl
self.ra = connect(svnurl)
self.head = self.ra.get_latest_rev()
def listdir(self):
for rev in range(1, self.head+1):
yield str(rev)
yield 'HEAD'
def join(self, name):
try:
rev = int(name)
except ValueError:
if name == 'HEAD':
return SymLink(str(self.head))
else:
raise KeyError(name)
return TopLevelDir(self.ra, rev, rev, '')
class Node:
def __init__(self, ra, rev, last_changed_rev, path):
self.ra = ra
self.rev = rev
self.last_changed_rev = last_changed_rev
self.path = path
def __repr__(self):
return '<%s %d/%s>' % (self.__class__.__name__, self.rev, self.path)
class Dir(Node):
def listdir(self):
rev, props, entries = self.ra.get_dir(self.path, self.rev,
want_props = False)
for key, stats in entries.items():
yield key, getnode(self.ra, self.rev,
posixpath.join(self.path, key), stats)
class File(Node):
def __init__(self, ra, rev, last_changed_rev, path, size):
Node.__init__(self, ra, rev, last_changed_rev, path)
self.filesize = size
def size(self):
return self.filesize
def read(self):
checksum, rev, props, data = self.ra.get_file(self.path, self.rev,
want_props = False)
return data
class TopLevelDir(Dir):
def listdir(self):
for item in Dir.listdir(self):
yield item
yield 'svn:log', Log(self.ra, self.rev)
class Log:
def __init__(self, ra, rev):
self.ra = ra
self.rev = rev
def getlogentry(self):
try:
return self.logentry
except AttributeError:
logentries = self.ra.log('', startrev=self.rev, endrev=self.rev)
try:
[self.logentry] = logentries
except ValueError:
self.logentry = None
return self.logentry
def size(self):
return len(self.read())
def read(self):
logentry = self.getlogentry()
if logentry is None:
return 'r%d | (no change here)\n' % (self.rev,)
datetuple = time.gmtime(decode(logentry.date))
date = time.strftime("%c", datetuple)
return 'r%d | %s | %s\n\n%s' % (self.rev,
logentry.author,
date,
logentry.message)
if 0:
pass
##if USE_SYMLINKS:
## def getnode(ra, rev, path, stats):
## committed_rev = stats['svn:entry:committed-rev']
## if committed_rev == rev:
## kind = stats['svn:entry:kind']
## if kind == 'file':
## return File(ra, rev, path, stats['svn:entry:size'])
## elif kind == 'dir':
## return Dir(ra, rev, path)
## else:
## raise IOError(errno.EINVAL, "kind %r" % (kind,))
## else:
## depth = path.count('/')
## return SymLink('../' * depth + '../%d/%s' % (committed_rev, path))
else:
def getnode(ra, rev, path, stats):
last_changed_rev = stats['svn:entry:committed-rev']
kind = stats['svn:entry:kind']
if kind == 'file':
return File(ra, rev, last_changed_rev, path,
stats['svn:entry:size'])
elif kind == 'dir':
return Dir(ra, rev, last_changed_rev, path)
else:
raise IOError(errno.EINVAL, "kind %r" % (kind,))
if __name__ == '__main__':
import sys
svnurl, mountpoint = sys.argv[1:]
handler = Handler(mountpoint, ObjectFs(Root(svnurl)))
handler.loop_forever()

305
contrib/fuse/impl_b/pyfuse/rwobjectfs.py Normal file
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from kernel import *
import stat, errno, os, time
from cStringIO import StringIO
from OrderedDict import OrderedDict
INFINITE = 86400.0
class Wrapper(object):
def __init__(self, obj):
self.obj = obj
def getuid(self):
return uid(self.obj)
def __hash__(self):
return hash(self.obj)
def __eq__(self, other):
return self.obj == other
def __ne__(self, other):
return self.obj != other
class BaseDir(object):
def join(self, name):
"Return a file or subdirectory object"
for item in self.listdir():
if isinstance(item, tuple):
subname, subnode = item
if subname == name:
return subnode
raise KeyError(name)
def listdir(self):
"Return a list of names, or a list of (name, object)"
raise NotImplementedError
def create(self, name):
"Create a file"
raise NotImplementedError
def mkdir(self, name):
"Create a subdirectory"
raise NotImplementedError
def symlink(self, name, target):
"Create a symbolic link"
raise NotImplementedError
def unlink(self, name):
"Remove a file or subdirectory."
raise NotImplementedError
def rename(self, newname, olddirnode, oldname):
"Move another node into this directory."
raise NotImplementedError
def getuid(self):
return uid(self)
def getattr(self, fs):
return fs.newattr(stat.S_IFDIR, self.getuid(), mode=0777), INFINITE
def setattr(self, **kwds):
pass
def getentries(self):
entries = OrderedDict()
for name in self.listdir():
if isinstance(name, tuple):
name, subnode = name
else:
subnode = None
entries[name] = subnode
return entries
class BaseFile(object):
def size(self):
"Return the size of the file, or None if not known yet"
f = self.open()
if isinstance(f, str):
return len(f)
f.seek(0, 2)
return f.tell()
def open(self):
"Return the content as a string or a file-like object"
raise NotImplementedError
def getuid(self):
return uid(self)
def getattr(self, fs):
sz = self.size()
attr = fs.newattr(stat.S_IFREG, self.getuid())
if sz is None:
timeout = 0
else:
attr.size = sz
timeout = INFINITE
return attr, timeout
def setattr(self, size, **kwds):
f = self.open()
if self.size() == size:
return
if isinstance(f, str):
raise IOError(errno.EPERM)
f.seek(size)
f.truncate()
class BaseSymLink(object):
def readlink(self):
"Return the symlink's target, as a string"
raise NotImplementedError
def getuid(self):
return uid(self)
def getattr(self, fs):
target = self.readlink()
attr = fs.newattr(stat.S_IFLNK, self.getuid())
attr.size = len(target)
attr.mode |= 0777
return attr, INFINITE
def setattr(self, **kwds):
pass
# ____________________________________________________________
class Dir(BaseDir):
def __init__(self, **contents):
self.contents = contents
def listdir(self):
return self.contents.items()
def join(self, name):
return self.contents[name]
def create(self, fs, name):
node = fs.File()
self.contents[name] = node
return node
def mkdir(self, fs, name):
node = fs.Dir()
self.contents[name] = node
return node
def symlink(self, fs, name, target):
node = fs.SymLink(target)
self.contents[name] = node
return node
def unlink(self, name):
del self.contents[name]
def rename(self, newname, olddirnode, oldname):
oldnode = olddirnode.join(oldname)
olddirnode.unlink(oldname)
self.contents[newname] = oldnode
class File(BaseFile):
def __init__(self):
self.data = StringIO()
def size(self):
self.data.seek(0, 2)
return self.data.tell()
def open(self):
return self.data
class SymLink(BaseFile):
def __init__(self, target):
self.target = target
def readlink(self):
return self.target
# ____________________________________________________________
class RWObjectFs(object):
"""A simple read-write file system based on Python objects."""
UID = os.getuid()
GID = os.getgid()
UMASK = os.umask(0); os.umask(UMASK)
Dir = Dir
File = File
SymLink = SymLink
def __init__(self, rootnode):
self.nodes = {FUSE_ROOT_ID: rootnode}
self.starttime = time.time()
def newattr(self, s, ino, mode=0666):
return fuse_attr(ino = ino,
size = 0,
mode = s | (mode & ~self.UMASK),
nlink = 1, # even on dirs! this confuses 'find' in
# a good way :-)
atime = self.starttime,
mtime = self.starttime,
ctime = self.starttime,
uid = self.UID,
gid = self.GID)
def getnode(self, nodeid):
try:
return self.nodes[nodeid]
except KeyError:
raise IOError(errno.ESTALE, nodeid)
def getattr(self, node):
return node.getattr(self)
def setattr(self, node, mode, uid, gid, size, atime, mtime):
node.setattr(mode=mode, uid=uid, gid=gid, size=size,
atime=atime, mtime=mtime)
def listdir(self, node):
entries = node.getentries()
for name, subnode in entries.items():
if subnode is None:
subnode = node.join(name)
self.nodes[uid(subnode)] = subnode
entries[name] = subnode
if isinstance(subnode, str):
yield name, TYPE_REG
elif hasattr(subnode, 'readlink'):
yield name, TYPE_LNK
elif hasattr(subnode, 'size'):
yield name, TYPE_REG
else:
yield name, TYPE_DIR
def lookup(self, node, name):
try:
subnode = node.join(name)
except KeyError:
raise IOError(errno.ENOENT, name)
else:
res = uid(subnode)
self.nodes[res] = subnode
return res, INFINITE
def mknod(self, dirnode, filename, mode):
node = dirnode.create(filename)
return self.newnodeid(node), INFINITE
def mkdir(self, dirnode, subdirname, mode):
node = dirnode.mkdir(subdirname)
return self.newnodeid(node), INFINITE
def symlink(self, dirnode, linkname, target):
node = dirnode.symlink(linkname, target)
return self.newnodeid(node), INFINITE
def unlink(self, dirnode, filename):
try:
dirnode.unlink(filename)
except KeyError:
raise IOError(errno.ENOENT, filename)
rmdir = unlink
def open(self, node, mode):
f = node.open()
if isinstance(f, str):
f = StringIO(f)
return f
def readlink(self, node):
return node.readlink()
def rename(self, olddirnode, oldname, newdirnode, newname):
try:
newdirnode.rename(newname, olddirnode, oldname)
except KeyError:
raise IOError(errno.ENOENT, oldname)
def getxattrs(self, node):
return getattr(node, '__dict__', {})
# ____________________________________________________________
import struct
try:
HUGEVAL = 256 ** struct.calcsize('P')
except struct.error:
HUGEVAL = 0
def fixid(result):
if result < 0:
result += HUGEVAL
return result
def uid(obj):
"""
Return the id of an object as an unsigned number so that its hex
representation makes sense
"""
return fixid(id(obj))

42
contrib/fuse/impl_b/pyfuse/svnfs.py Normal file
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import py
from handler import Handler
from objectfs import ObjectFs
class SvnDir:
def __init__(self, path):
self.path = path
def listdir(self):
for p in self.path.listdir():
if p.check(dir=1):
cls = SvnDir
else:
cls = SvnFile
yield p.basename, cls(p)
class SvnFile:
data = None
def __init__(self, path):
self.path = path
def size(self):
if self.data is None:
return None
else:
return len(self.data)
def read(self):
if self.data is None:
self.data = self.path.read()
return self.data
if __name__ == '__main__':
import sys
svnurl, mountpoint = sys.argv[1:]
root = SvnDir(py.path.svnurl(svnurl))
handler = Handler(mountpoint, ObjectFs(root))
handler.loop_forever()

106
contrib/fuse/impl_b/pyfuse/tahoe.py Normal file
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"""
PyFuse client for the Tahoe distributed file system.
See http://allmydata.org/
"""
# Read-only for now.
# Portions copied from the file contrib/fuse/tahoe_fuse.py distributed
# with Tahoe 1.0.0.
import os, sys
from objectfs import ObjectFs
from handler import Handler
import simplejson
import urllib
### Config:
TahoeConfigDir = '~/.tahoe'
### Utilities for debug:
def log(msg, *args):
print msg % args
class TahoeConnection:
def __init__(self, confdir):
self.confdir = confdir
self._init_url()
def _init_url(self):
f = open(os.path.join(self.confdir, 'webport'), 'r')
contents = f.read()
f.close()
fields = contents.split(':')
proto, port = fields[:2]
assert proto == 'tcp'
port = int(port)
self.url = 'http://localhost:%d' % (port,)
def get_root(self):
# For now we just use the same default as the CLI:
rootdirfn = os.path.join(self.confdir, 'private', 'root_dir.cap')
f = open(rootdirfn, 'r')
cap = f.read().strip()
f.close()
return TahoeDir(self, canonicalize_cap(cap))
class TahoeNode:
def __init__(self, conn, uri):
self.conn = conn
self.uri = uri
def get_metadata(self):
f = self._open('?t=json')
json = f.read()
f.close()
return simplejson.loads(json)
def _open(self, postfix=''):
url = '%s/uri/%s%s' % (self.conn.url, self.uri, postfix)
log('*** Fetching: %r', url)
return urllib.urlopen(url)
class TahoeDir(TahoeNode):
def listdir(self):
flag, md = self.get_metadata()
assert flag == 'dirnode'
result = []
for name, (childflag, childmd) in md['children'].items():
if childflag == 'dirnode':
cls = TahoeDir
else:
cls = TahoeFile
result.append((str(name), cls(self.conn, childmd['ro_uri'])))
return result
class TahoeFile(TahoeNode):
def size(self):
rawsize = self.get_metadata()[1]['size']
return rawsize
def read(self):
return self._open().read()
def canonicalize_cap(cap):
cap = urllib.unquote(cap)
i = cap.find('URI:')
assert i != -1, 'A cap must contain "URI:...", but this does not: ' + cap
return cap[i:]
def main(mountpoint, basedir):
conn = TahoeConnection(basedir)
root = conn.get_root()
handler = Handler(mountpoint, ObjectFs(root))
handler.loop_forever()
if __name__ == '__main__':
[mountpoint] = sys.argv[1:]
basedir = os.path.expanduser(TahoeConfigDir)
main(mountpoint, basedir)

172
contrib/fuse/impl_b/pyfuse/test.py Normal file
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from handler import Handler
import stat, errno, os, time
from cStringIO import StringIO
from kernel import *
UID = os.getuid()
GID = os.getgid()
UMASK = os.umask(0); os.umask(UMASK)
INFINITE = 86400.0
class Node(object):
__slots__ = ['attr', 'data']
def __init__(self, attr, data=None):
self.attr = attr
self.data = data
def type(self):
return mode2type(self.attr.mode)
def modified(self):
self.attr.mtime = self.attr.atime = time.time()
t = self.type()
if t == TYPE_REG:
f = self.data
pos = f.tell()
f.seek(0, 2)
self.attr.size = f.tell()
f.seek(pos)
elif t == TYPE_DIR:
nsubdirs = 0
for nodeid in self.data.values():
nsubdirs += nodeid & 1
self.attr.nlink = 2 + nsubdirs
def newattr(s, mode=0666):
now = time.time()
return fuse_attr(ino = INVALID_INO,
size = 0,
mode = s | (mode & ~UMASK),
nlink = 1 + (s == stat.S_IFDIR),
atime = now,
mtime = now,
ctime = now,
uid = UID,
gid = GID)
# ____________________________________________________________
class Filesystem:
def __init__(self, rootnode):
self.nodes = {FUSE_ROOT_ID: rootnode}
self.nextid = 2
assert self.nextid > FUSE_ROOT_ID
def getnode(self, nodeid):
try:
return self.nodes[nodeid]
except KeyError:
raise IOError(errno.ESTALE, nodeid)
def forget(self, nodeid):
pass
def cachenode(self, node):
id = self.nextid
self.nextid += 2
if node.type() == TYPE_DIR:
id += 1
self.nodes[id] = node
return id
def getattr(self, node):
return node.attr, INFINITE
def setattr(self, node, mode=None, uid=None, gid=None,
size=None, atime=None, mtime=None):
if mode is not None: node.attr.mode = (node.attr.mode&~0777) | mode
if uid is not None: node.attr.uid = uid
if gid is not None: node.attr.gid = gid
if atime is not None: node.attr.atime = atime
if mtime is not None: node.attr.mtime = mtime
if size is not None and node.type() == TYPE_REG:
node.data.seek(size)
node.data.truncate()
def listdir(self, node):
for name, subnodeid in node.data.items():
subnode = self.nodes[subnodeid]
yield name, subnode.type()
def lookup(self, node, name):
try:
return node.data[name], INFINITE
except KeyError:
pass
if hasattr(node, 'findnode'):
try:
subnode = node.findnode(name)
except KeyError:
pass
else:
id = self.cachenode(subnode)
node.data[name] = id
return id, INFINITE
raise IOError(errno.ENOENT, name)
def open(self, node, mode):
return node.data
def mknod(self, node, name, mode):
subnode = Node(newattr(mode & 0170000, mode & 0777))
if subnode.type() == TYPE_REG:
subnode.data = StringIO()
else:
raise NotImplementedError
id = self.cachenode(subnode)
node.data[name] = id
node.modified()
return id, INFINITE
def mkdir(self, node, name, mode):
subnode = Node(newattr(stat.S_IFDIR, mode & 0777), {})
id = self.cachenode(subnode)
node.data[name] = id
node.modified()
return id, INFINITE
def symlink(self, node, linkname, target):
subnode = Node(newattr(stat.S_IFLNK, 0777), target)
id = self.cachenode(subnode)
node.data[linkname] = id
node.modified()
return id, INFINITE
def readlink(self, node):
assert node.type() == TYPE_LNK
return node.data
def unlink(self, node, name):
try:
del node.data[name]
except KeyError:
raise IOError(errno.ENOENT, name)
node.modified()
rmdir = unlink
def rename(self, oldnode, oldname, newnode, newname):
if newnode.type() != TYPE_DIR:
raise IOError(errno.ENOTDIR, newnode)
try:
nodeid = oldnode.data.pop(oldname)
except KeyError:
raise IOError(errno.ENOENT, oldname)
oldnode.modified()
newnode.data[newname] = nodeid
newnode.modified()
def modified(self, node):
node.modified()
# ____________________________________________________________
if __name__ == '__main__':
root = Node(newattr(stat.S_IFDIR), {})
handler = Handler('/home/arigo/mnt', Filesystem(root))
handler.loop_forever()