/usr/lib/python2.7/dist-packages/wikipediafs/metadir.py is in wikipediafs 0.4-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# WikipediaFS
# Copyright (C) 2005 - 2007 Mathieu Blondel
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import os, stat, errno, time
from cStringIO import StringIO
import fuse
from fuse import Fuse
from logger import LOGGER
# This setting is optional, but it ensures that this class will keep
# working after a future API revision
fuse.fuse_python_api = (0, 2)
class MetaDir(Fuse):
"""
MetaDir allows to associate one directory with one class.
Therefore each directory can define its own behaviour in its own class.
It creates a higher level API so that we do not have do deal with
inodes and other low level data structures.
It takes care of editor files which can be a pain to deal with otherwise.
"""
class Stat(fuse.Stat):
def __init__(self):
self.st_mode = 0
self.st_ino = 0
self.st_dev = 0
self.st_nlink = 0
self.st_uid = int(os.getuid())
self.st_gid = int(os.getgid())
self.st_size = 0
self.st_atime = 0
self.st_mtime = 0
self.st_ctime = 0
READ = 0
WRITE = 1
def __init__(self, *arr, **dic):
Fuse.__init__(self, *arr, **dic)
self.dirs = {}
self.open_mode = None
# hold files used by the filesystem
# valid files should be removed from it as soon as they are "released"
# editor files should be kept
# (they will be deleted by the editors with unlink)
self.files = {}
def set_dir(self, path, directory):
self.dirs[path] = directory
def set_root(self, directory):
self.set_dir('/', directory)
def get_dir(self, path):
# Selects fs object on which we will call is_file, is_directory,
# contents, etc
dirname = os.path.dirname(path)
if path == '/' and not self.dirs.has_key('/'):
raise Exception("At least the root class must be defined")
elif self.dirs.has_key(dirname):
return self.dirs[dirname]
else:
return self.get_dir(dirname)
def get_file_buf(self, path):
if not self.files.has_key(path):
self.files[path] = StringIO()
return self.files[path]
def remove_file_buf(self, path):
if self.files.has_key(path):
self.files.pop(path)
def has_file_buf(self, path):
if self.files.has_key(path):
return True
else:
return False
def is_valid_file(self, path):
name = os.path.basename(path)
if len(name) > 0:
if name[0] == ".":# hidden file
return False
elif name[-4:] == ".swp": # vi swap file
return False
elif name[-1] == "~": # swap file too
return False
elif name[0] == "#" or name[0:2] == "s." or \
name[0:2] == "p.": # emacs
return False
else:
return True
else:
return True
def getattr(self, path):
LOGGER.debug("getattr %s" % path)
d = self.get_dir(path)
st = MetaDir.Stat()
if self.files.has_key(path):
st.st_mode = stat.S_IFREG | 0666
st.st_nlink = 1
st.st_size = 0
elif not self.is_valid_file(path):
return -errno.ENOENT # No such file or directory
elif d.is_directory(path):
st.st_mode = stat.S_IFDIR | d.mode(path)
st.st_nlink = 2
elif d.is_file(path):
st.st_mode = stat.S_IFREG | d.mode(path)
st.st_nlink = 1
st.st_size = d.size(path)
st.st_mtime = d.mtime(path)
else:
return -errno.ENOENT # No such file or directory
return st
def readdir(self, path, offset):
LOGGER.debug("readdir %s %d" % (path, offset))
if path == "/":
d = self.get_dir(path)
else:
d = self.get_dir(path + "/")
dirs = d.contents(path)
if dirs is None:
dirs = []
for e in ('.', '..'):
if dirs.count(e) == 0:
dirs.append(e)
for r in dirs:
yield fuse.Direntry(r)
def mknod(self, path, mode, dev):
# Creates a filesystem node
LOGGER.debug("mknod %s %d %s" % (path, mode, dev))
def create(self, path, mode, dev):
# create is called to write a file that does not exist yet
LOGGER.debug("create %s %d %d" % (path, mode, dev))
if self.is_valid_file(path):
d = self.get_dir(path)
# We also need to check if it is a valid file for the fs
if dir(d).count("is_valid_file") == 1 and not d.is_valid_file(path):
return -errno.EACCES # Permission denied
else:
return -errno.EACCES # Permission denied
self.get_file_buf(path)
def truncate(self, path, size):
# Truncate is called just before open when a file is to be written
# in order to make it empty
LOGGER.debug("truncate %s %d" % (path, size))
buf = self.get_file_buf(path)
if self.is_valid_file(path):
d = self.get_dir(path)
txt = d.read_file(path)
buf.write(txt)
buf.truncate(size)
def open(self, path, flags):
LOGGER.debug("open %s %d" % (path, flags))
if not self.files.has_key(path):
if self.is_valid_file(path):
buf = self.get_file_buf(path)
d = self.get_dir(path)
txt = d.read_file(path)
buf.write(txt)
def read(self, path, size, offset):
LOGGER.debug("read %s %d %d" % (path, size, offset))
self.open_mode = self.READ
buf = self.get_file_buf(path)
buf.seek(offset)
return buf.read(size)
def write(self, path, txt, offset):
LOGGER.debug("write %s [...] %d" % (path, offset))
self.open_mode = self.WRITE
buf = self.get_file_buf(path)
buf.seek(offset)
buf.write(txt)
return len(txt)
def fsync(self, path, isfsyncfile = 0):
LOGGER.info("Fsync %s %s" % (path, isfsyncfile))
return self.flush (path, 0)
def flush(self, path, flags = 0):
# Did we succeed?
success = True
# Called to close the file
LOGGER.debug("flush %s %x" % (path, flags))
if self.open_mode == self.WRITE and self.is_valid_file(path):
# for valid files
buf = self.get_file_buf(path)
d = self.get_dir(path)
success = d.write_to(path, buf.getvalue())
LOGGER.debug("flush: success: %d\n" % (success));
if success == False:
LOGGER.debug("flush: Returning\n" % (-errno.EIO));
return -errno.EIO
return None
def release(self, path, flags):
# Called to close the file
LOGGER.debug("release %s %x" % (path, flags))
# Release can not return errors, but try anyhow because we have no other choices.
# XXX: Is the flush called reliably enough to do this there?
if self.open_mode == self.WRITE and self.is_valid_file(path):
# for valid files
buf = self.get_file_buf(path)
d = self.get_dir(path)
success = d.write_to(path, buf.getvalue())
LOGGER.debug("release: success: %d\n" % (success));
if self.is_valid_file(path):
self.remove_file_buf(path) # Do not keep buffer in memory...
self.open_mode = None
return None
def mkdir(self, path, mode):
LOGGER.debug("mkdir %s %x" % (path, mode))
d = self.get_dir(path)
if dir(d).count("mkdir") == 0:
return -errno.EACCES # Permission denied
else:
res = d.mkdir(path)
if res != True:
return -errno.EACCES # Permission denied
def unlink(self, path):
LOGGER.debug("unlink %s" % path)
d = self.get_dir(path)
self.remove_file_buf(path)
if self.is_valid_file(path):
if dir(d).count("unlink") == 0:
return -errno.EACCES # Permission denied
else:
res = d.unlink(path)
if res != True:
return -errno.EACCES # Permission denied
def rmdir(self, path):
LOGGER.debug("rmdir %s" % path)
d = self.get_dir(path)
if dir(d).count("rmdir") == 0:
return -errno.EACCES # Permission denied
else:
res = d.rmdir(path)
if res != True:
return -errno.EACCES # Permission denied
def rename(self, path, path1):
# Rename is handled by copying and deleting files...
LOGGER.debug("rename %s %s" % (path, path1))
d = self.get_dir(path)
if self.is_valid_file(path) and d.is_file(path):
if not self.is_valid_file(path1):
# from a valid file to an editor file
buf = self.get_file_buf(path1)
buf.write(d.read_file(path))
# TODO : remove path ?
else:
# from a valid file to a valid file
# if rename is defined
# TODO : with unlink method defined in fs
pass
elif not self.is_valid_file(path):
if self.is_valid_file(path1) and d.is_file(path1):
# from an editor file to a valid file
buf = self.get_file_buf(path)
ret = d.write_to(path1, buf.getvalue())
self.open_mode = None
self.remove_file_buf(path)
if ret == False:
return -errno.EIO
elif not self.is_valid_file(path):
# from an editor file to an editor file
# TODO
pass
def utime(self, path, times):
LOGGER.debug("utime %s %s" % (path, times))
d = self.get_dir(path)
if dir(d).count("utime") == 0:
return -errno.ENOSYS # Not implemented
else:
return d.utime(path, times)
def chmod(self, path, mode):
LOGGER.debug("chmod %s %s" % (path,mode))
return None
def chown(self, path, user, group):
LOGGER.debug("chown %s %s %s" % (path,user,group))
return None
if __name__ == "__main__":
class Hello:
def __init__(self):
self.hello_file_content = "Hello world, MetaDir powa !"
def contents(self, path):
if path == '/':
return ['hello_dir', 'hello_file']
else:
return []
def is_directory(self, path):
if path == '/hello_dir' or path == '/':
return True
else:
return False
def is_file(self, path):
if path == '/hello_file':
return True
else:
return False
def size(self, path):
if path == '/hello_file':
return len(self.hello_file_content)
else:
return 0
def mode(self, path):
return 0755
def read_file(self, path):
if path == '/hello_file':
return self.hello_file_content
else:
return None
def write_to(self, path, txt):
if path == '/hello_file':
self.hello_file_content = txt
class TestFS(MetaDir):
def __init__(self, *arr, **dic):
MetaDir.__init__(self, *arr, **dic)
self.set_root(Hello())
fs = TestFS()
print fs.getattr('/')
print fs.readdir('/', 0)
print fs.getattr('/hello_file')
fs.open('/hello_file', 32768)
print fs.read('/hello_file', 100, 0)
fs.release('/hello_file', 32768)
fs.open('/hello_file', 32768)
fs.write('/hello_file', 'New string', 0)
fs.release('/hello_file', 32768)
fs.open('/hello_file', 32768)
print fs.read('/hello_file', 100, 0)
fs.release('/hello_file', 32768)
print fs.mkdir('/new_dir', 32768)
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