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#!/usr/bin/env python
from collections import defaultdict
from errno import ENOENT, EROFS
from stat import S_IFMT, S_IMODE, S_IFDIR, S_IFREG
from sys import argv, exit
from time import time
from fusell import FUSELL
class Memory(FUSELL):
def create_ino(self):
self.ino += 1
return self.ino
def init(self, userdata, conn):
self.ino = 1
self.attr = defaultdict(dict)
self.data = defaultdict(str)
self.parent = {}
self.children = defaultdict(dict)
self.attr[1] = {'st_ino': 1, 'st_mode': S_IFDIR | 0777, 'st_nlink': 2}
self.parent[1] = 1
forget = None
def getattr(self, req, ino, fi):
print 'getattr:', ino
attr = self.attr[ino]
if attr:
self.reply_attr(req, attr, 1.0)
else:
self.reply_err(req, ENOENT)
def lookup(self, req, parent, name):
print 'lookup:', parent, name
children = self.children[parent]
ino = children.get(name, 0)
attr = self.attr[ino]
if attr:
entry = {'ino': ino, 'attr': attr, 'atttr_timeout': 1.0, 'entry_timeout': 1.0}
self.reply_entry(req, entry)
else:
self.reply_err(req, ENOENT)
def mkdir(self, req, parent, name, mode):
print 'mkdir:', parent, name
ino = self.create_ino()
ctx = self.req_ctx(req)
now = time()
attr = {
'st_ino': ino,
'st_mode': S_IFDIR | mode,
'st_nlink': 2,
'st_uid': ctx['uid'],
'st_gid': ctx['gid'],
'st_atime': now,
'st_mtime': now,
'st_ctime': now}
self.attr[ino] = attr
self.attr[parent]['st_nlink'] += 1
self.parent[ino] = parent
self.children[parent][name] = ino
entry = {'ino': ino, 'attr': attr, 'atttr_timeout': 1.0, 'entry_timeout': 1.0}
self.reply_entry(req, entry)
def mknod(self, req, parent, name, mode, rdev):
print 'mknod:', parent, name
ino = self.create_ino()
ctx = self.req_ctx(req)
now = time()
attr = {
'st_ino': ino,
'st_mode': mode,
'st_nlink': 1,
'st_uid': ctx['uid'],
'st_gid': ctx['gid'],
'st_rdev': rdev,
'st_atime': now,
'st_mtime': now,
'st_ctime': now}
self.attr[ino] = attr
self.attr[parent]['st_nlink'] += 1
self.children[parent][name] = ino
entry = {'ino': ino, 'attr': attr, 'atttr_timeout': 1.0, 'entry_timeout': 1.0}
self.reply_entry(req, entry)
def open(self, req, ino, fi):
print 'open:', ino
self.reply_open(req, fi)
def read(self, req, ino, size, off, fi):
print 'read:', ino, size, off
buf = self.data[ino][off:(off + size)]
self.reply_buf(req, buf)
def readdir(self, req, ino, size, off, fi):
print 'readdir:', ino
parent = self.parent[ino]
entries = [('.', {'st_ino': ino, 'st_mode': S_IFDIR}),
('..', {'st_ino': parent, 'st_mode': S_IFDIR})]
for name, child in self.children[ino].items():
entries.append((name, self.attr[child]))
self.reply_readdir(req, size, off, entries)
def rename(self, req, parent, name, newparent, newname):
print 'rename:', parent, name, newparent, newname
ino = self.children[parent].pop(name)
self.children[newparent][newname] = ino
self.parent[ino] = newparent
self.reply_err(req, 0)
def setattr(self, req, ino, attr, to_set, fi):
print 'setattr:', ino, to_set
a = self.attr[ino]
for key in to_set:
if key == 'st_mode':
# Keep the old file type bit fields
a['st_mode'] = S_IFMT(a['st_mode']) | S_IMODE(attr['st_mode'])
else:
a[key] = attr[key]
self.attr[ino] = a
self.reply_attr(req, a, 1.0)
def write(self, req, ino, buf, off, fi):
print 'write:', ino, off, len(buf)
self.data[ino] = self.data[ino][:off] + buf
self.attr[ino]['st_size'] = len(self.data[ino])
self.reply_write(req, len(buf))
if __name__ == '__main__':
if len(argv) != 2:
print 'usage: %s <mountpoint>' % argv[0]
exit(1)
fuse = Memory(argv[1])
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