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# -*- coding: utf-8 -*-
# aptfs -- FUSE filesystem for APT source repositories
# Copyright (C) 2008 Chris Lamb <chris@chris-lamb.co.uk>
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
import os
import fcntl
from AptFs import util
class AptFsFile(object):
def __init__(self, path, flags, *mode):
self.file = os.fdopen(os.open(path, flags, *mode), util.flag2mode(flags))
self.fd = self.file.fileno()
def read(self, length, offset):
self.file.seek(offset)
return self.file.read(length)
def write(self, buf, offset):
self.file.seek(offset)
self.file.write(buf)
return len(buf)
def release(self, flags):
self.file.close()
def _fflush(self):
if 'w' in self.file.mode or 'a' in self.file.mode:
self.file.flush()
def fsync(self, isfsyncfile):
self._fflush()
if isfsyncfile and hasattr(os, 'fdatasync'):
os.fdatasync(self.fd)
else:
os.fsync(self.fd)
def flush(self):
self._fflush()
return os.close(os.dup(self.fd))
def fgetattr(self):
return os.fstat(self.fd)
def ftruncate(self, len):
self.file.truncate(len)
def lock(self, cmd, owner, **kw):
# Convert fcntl-ish lock parameters to Python's weird
# lockf(3)/flock(2) medley locking API...
op = { fcntl.F_UNLCK : fcntl.LOCK_UN,
fcntl.F_RDLCK : fcntl.LOCK_SH,
fcntl.F_WRLCK : fcntl.LOCK_EX }[kw['l_type']]
if cmd == fcntl.F_GETLK:
return -EOPNOTSUPP
elif cmd == fcntl.F_SETLK:
if op != fcntl.LOCK_UN:
op |= fcntl.LOCK_NB
elif cmd == fcntl.F_SETLKW:
pass
else:
return -EINVAL
fcntl.lockf(self.fd, op, kw['l_start'], kw['l_len'])
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