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FSProxy.py
"""File System Proxy. Provide an OS-neutral view on a file system, locally or remotely. The functionality is geared towards implementing some sort of rdist-like utility between a Mac and a UNIX system. The module defines three classes: FSProxyLocal -- used for local access FSProxyServer -- used on the server side of remote access FSProxyClient -- used on the client side of remote access The remote classes are instantiated with an IP address and an optional verbosity flag. """ import server import client import md5 import os import fnmatch from stat import * import time import fnmatch maxnamelen = 255 skipnames = (os.curdir, os.pardir) class FSProxyLocal: def __init__(self): self._dirstack = [] self._ignore = ['*.pyc'] + self._readignore() def _close(self): while self._dirstack: self.back() def _readignore(self): file = self._hide('ignore') try: f = open(file) except IOError: file = self._hide('synctree.ignorefiles') try: f = open(file) except IOError: return [] ignore = [] while 1: line = f.readline() if not line: break if line[-1] == '\n': line = line[:-1] ignore.append(line) f.close() return ignore def _hidden(self, name): return name[0] == '.' def _hide(self, name): return '.%s' % name def visible(self, name): if len(name) > maxnamelen: return 0 if name[-1] == '~': return 0 if name in skipnames: return 0 if self._hidden(name): return 0 head, tail = os.path.split(name) if head or not tail: return 0 if os.path.islink(name): return 0 if '\0' in open(name, 'rb').read(512): return 0 for ign in self._ignore: if fnmatch.fnmatch(name, ign): return 0 return 1 def check(self, name): if not self.visible(name): raise os.error, "protected name %s" % repr(name) def checkfile(self, name): self.check(name) if not os.path.isfile(name): raise os.error, "not a plain file %s" % repr(name) def pwd(self): return os.getcwd() def cd(self, name): self.check(name) save = os.getcwd(), self._ignore os.chdir(name) self._dirstack.append(save) self._ignore = self._ignore + self._readignore() def back(self): if not self._dirstack: raise os.error, "empty directory stack" dir, ignore = self._dirstack[-1] os.chdir(dir) del self._dirstack[-1] self._ignore = ignore def _filter(self, files, pat = None): if pat: def keep(name, pat = pat): return fnmatch.fnmatch(name, pat) files = filter(keep, files) files = filter(self.visible, files) files.sort() return files def list(self, pat = None): files = os.listdir(os.curdir) return self._filter(files, pat) def listfiles(self, pat = None): files = os.listdir(os.curdir) files = filter(os.path.isfile, files) return self._filter(files, pat) def listsubdirs(self, pat = None): files = os.listdir(os.curdir) files = filter(os.path.isdir, files) return self._filter(files, pat) def exists(self, name): return self.visible(name) and os.path.exists(name) def isdir(self, name): return self.visible(name) and os.path.isdir(name) def islink(self, name): return self.visible(name) and os.path.islink(name) def isfile(self, name): return self.visible(name) and os.path.isfile(name) def sum(self, name): self.checkfile(name) BUFFERSIZE = 1024*8 f = open(name) sum = md5.new() while 1: buffer = f.read(BUFFERSIZE) if not buffer: break sum.update(buffer) return sum.digest() def size(self, name): self.checkfile(name) return os.stat(name)[ST_SIZE] def mtime(self, name): self.checkfile(name) return time.localtime(os.stat(name)[ST_MTIME]) def stat(self, name): self.checkfile(name) size = os.stat(name)[ST_SIZE] mtime = time.localtime(os.stat(name)[ST_MTIME]) return size, mtime def info(self, name): sum = self.sum(name) size = os.stat(name)[ST_SIZE] mtime = time.localtime(os.stat(name)[ST_MTIME]) return sum, size, mtime def _list(self, function, list): if list is None: list = self.listfiles() res = [] for name in list: try: res.append((name, function(name))) except (os.error, IOError): res.append((name, None)) return res def sumlist(self, list = None): return self._list(self.sum, list) def statlist(self, list = None): return self._list(self.stat, list) def mtimelist(self, list = None): return self._list(self.mtime, list) def sizelist(self, list = None): return self._list(self.size, list) def infolist(self, list = None): return self._list(self.info, list) def _dict(self, function, list): if list is None: list = self.listfiles() dict = {} for name in list: try: dict[name] = function(name) except (os.error, IOError): pass return dict def sumdict(self, list = None): return self.dict(self.sum, list) def sizedict(self, list = None): return self.dict(self.size, list) def mtimedict(self, list = None): return self.dict(self.mtime, list) def statdict(self, list = None): return self.dict(self.stat, list) def infodict(self, list = None): return self._dict(self.info, list) def read(self, name, offset = 0, length = -1): self.checkfile(name) f = open(name) f.seek(offset) if length == 0: data = '' elif length < 0: data = f.read() else: data = f.read(length) f.close() return data def create(self, name): self.check(name) if os.path.exists(name): self.checkfile(name) bname = name + '~' try: os.unlink(bname) except os.error: pass os.rename(name, bname) f = open(name, 'w') f.close() def write(self, name, data, offset = 0): self.checkfile(name) f = open(name, 'r+') f.seek(offset) f.write(data) f.close() def mkdir(self, name): self.check(name) os.mkdir(name, 0777) def rmdir(self, name): self.check(name) os.rmdir(name) class FSProxyServer(FSProxyLocal, server.Server): def __init__(self, address, verbose = server.VERBOSE): FSProxyLocal.__init__(self) server.Server.__init__(self, address, verbose) def _close(self): server.Server._close(self) FSProxyLocal._close(self) def _serve(self): server.Server._serve(self) # Retreat into start directory while self._dirstack: self.back() class FSProxyClient(client.Client): def __init__(self, address, verbose = client.VERBOSE): client.Client.__init__(self, address, verbose) def test(): import string import sys if sys.argv[1:]: port = string.atoi(sys.argv[1]) else: port = 4127 proxy = FSProxyServer(('', port)) proxy._serverloop() if __name__ == '__main__': test()
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