#!/usr/bin/env python
from __future__ import with_statement
import os
import sys
import errno
from fuse import FUSE, FuseOSError, Operations
class Passthrough(Operations):
def __init__(self, root):
self.root = root
# Helpers
# =======
def _full_path(self, partial):
if partial.startswith("/"):
partial = partial[1:]
path = os.path.join(self.root, partial)
return path
# Filesystem methods
# ==================
def access(self, path, mode):
full_path = self._full_path(path)
if not os.access(full_path, mode):
raise FuseOSError(errno.EACCES)
def chmod(self, path, mode):
full_path = self._full_path(path)
return os.chmod(full_path, mode)
def chown(self, path, uid, gid):
full_path = self._full_path(path)
return os.chown(full_path, uid, gid)
def getattr(self, path, fh=None):
full_path = self._full_path(path)
st = os.lstat(full_path)
return dict((key, getattr(st, key)) for key in ('st_atime', 'st_ctime',
'st_gid', 'st_mode', 'st_mtime', 'st_nlink', 'st_size', 'st_uid'))
def readdir(self, path, fh):
full_path = self._full_path(path)
dirents = ['.', '..']
if os.path.isdir(full_path):
dirents.extend(os.listdir(full_path))
for r in dirents:
yield r
def readlink(self, path):
pathname = os.readlink(self._full_path(path))
if pathname.startswith("/"):
# Path name is absolute, sanitize it.
return os.path.relpath(pathname, self.root)
else:
return pathname
def mknod(self, path, mode, dev):
return os.mknod(self._full_path(path), mode, dev)
def rmdir(self, path):
full_path = self._full_path(path)
return os.rmdir(full_path)
def mkdir(self, path, mode):
return os.mkdir(self._full_path(path), mode)
def statfs(self, path):
full_path = self._full_path(path)
stv = os.statvfs(full_path)
return dict((key, getattr(stv, key)) for key in ('f_bavail', 'f_bfree',
'f_blocks', 'f_bsize', 'f_favail', 'f_ffree', 'f_files', 'f_flag',
'f_frsize', 'f_namemax'))
def unlink(self, path):
return os.unlink(self._full_path(path))
def symlink(self, target, name):
return os.symlink(self._full_path(target), self._full_path(name))
def rename(self, old, new):
return os.rename(self._full_path(old), self._full_path(new))
def link(self, target, name):
return os.link(self._full_path(target), self._full_path(name))
def utimens(self, path, times=None):
return os.utime(self._full_path(path), times)
# File methods
# ============
def open(self, path, flags):
full_path = self._full_path(path)
return os.open(full_path, flags)
def create(self, path, mode, fi=None):
full_path = self._full_path(path)
return os.open(full_path, os.O_WRONLY | os.O_CREAT, mode)
def read(self, path, length, offset, fh):
os.lseek(fh, offset, os.SEEK_SET)
return os.read(fh, length)
def write(self, path, buf, offset, fh):
os.lseek(fh, offset, os.SEEK_SET)
return os.write(fh, buf)
def truncate(self, path, length, fh=None):
full_path = self._full_path(path)
with open(full_path, 'r+') as f:
f.truncate(length)
def flush(self, path, fh):
return os.fsync(fh)
def release(self, path, fh):
return os.close(fh)
def fsync(self, path, fdatasync, fh):
return self.flush(path, fh)
def main(mountpoint, root):
FUSE(Passthrough(root), mountpoint, foreground=True)
if __name__ == '__main__':
main(sys.argv[2], sys.argv[1])
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如果你想作为一个脚本运行它，那么安装fusepy，放这个脚本到一个文件里（例如myfuse.py),然后运行python myfuse.py /your/dir /mnt/point。你将看到在/mnt/point下/your/dir中的所有文件能被操作，就像它们是在原始的文件系统。
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结语
总的来说,我没想到写一个文件系统是如此简单。现在剩下的就是在脚本中编写加密/解密功能和一些辅助方法。我的目标是这个脚本可以完整替代EncFS,特别是它具有更好的扩展性(它是用Python写)和旨在备份文件这样额外的特性。
如果你想继续关注这个脚本的开发,请订阅下面我的邮件列表,或在Twitter上跟帖。一如既往,非常欢迎反馈(理想的的方法是跟帖评论)。
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