459 lines
15 KiB
Python
Executable file
459 lines
15 KiB
Python
Executable file
#!/usr/bin/python -u
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#!/usr/bin/env python
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# Copyright (C) 2001 Jeff Epler <jepler@unpythonic.dhs.org>
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# Copyright (C) 2006 Csaba Henk <csaba.henk@creo.hu>
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#
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# This program can be distributed under the terms of the GNU LGPL.
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# See the file COPYING.
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#
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import os, sys
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from errno import *
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from stat import *
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import fcntl
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# pull in some spaghetti to make this stuff work without fuse-py being installed
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try:
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import _find_fuse_parts
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except ImportError:
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pass
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import fuse
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from fuse import Fuse
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# JS - Snapshotnamehandling, get the current user and so on
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import getpass
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import socket
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from time import strptime, strftime
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from datetime import datetime,date,time,timedelta
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#from mksnapshotconfig import *
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from mkbackup.mkbackup_btrfs_config import *
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DEBUG = False
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if not hasattr(fuse, '__version__'):
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raise RuntimeError, \
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"your fuse-py doesn't know of fuse.__version__, probably it's too old."
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fuse.fuse_python_api = (0, 2)
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fuse.feature_assert('stateful_files', 'has_init')
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def flag2mode(flags):
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md = {os.O_RDONLY: 'r', os.O_WRONLY: 'w', os.O_RDWR: 'w+'}
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m = md[flags & (os.O_RDONLY | os.O_WRONLY | os.O_RDWR)]
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if flags | os.O_APPEND:
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m = m.replace('w', 'a', 1)
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return m
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class Xmp(Fuse):
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def __init__(self, *args, **kw):
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Fuse.__init__(self, *args, **kw)
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if DEBUG:
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for i in args: print "ARG: "+i
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for i in kw: print "KW: "+i
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#get hostname
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# die auskommentierte if-Funktion liefert hostname.localdomain.
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# if socket.gethostname().find('.')>=0:
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# hostname=socket.gethostname()
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# else:
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# hostname=socket.gethostbyaddr(socket.gethostname())[0]
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#socket.gethostname() liefert nur "hostname" ohne .localdomain
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hostname=socket.gethostname()
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# do stuff to set up your filesystem here, if you want
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#import thread
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#thread.start_new_thread(self.mythread, ())
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CONFIG=Config()
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self.root=CONFIG.getStorePath('SNP').encode()
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self.local=CONFIG.getStorePath('SNP').encode()
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self.extern=CONFIG.getStorePath('BKP').encode()
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self.snapshots={}
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self.direntries=[]
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Xmp.realpath=""
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self.USER=getpass.getuser()
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if os.getuid() == 0:
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self.uroot = True
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else:
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self.uroot = False
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try:
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self.HOME=os.environ['HOME']
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except:
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self.HOME = None
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self.uroot = True
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# JS - some helpers
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def translate(self,subvolname,location='loc'):
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n = len(subvolname.split('.'))
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ac = ""
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sn = subvolname.split('.')[0]+'.'
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if n == 1:
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#return subvolname+'--'+location
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return 'CURRENT--'+location
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elif n == 2:
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return subvolname+'--'+location
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elif n == 3:
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try:
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sndt = datetime.strptime(subvolname.split('.')[1],"%Y-%m-%d_%H:%M:%S") #snapshot-timestamp
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except:
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return subvolname+'--'+location
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action = subvolname.split('.')[2]
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if self.uroot:
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ac='-'+action
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else:
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sn = ''
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if action == 'manually':
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ac="-"+action
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elif action == 'aptupgrade':
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ac="-"+action
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else:
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ac=""
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snd = datetime.date(sndt) #snapshot-date
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if snd == datetime.date(datetime.now()):
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#today
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dts = sn+'heute_%H-%M-%S'
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elif snd == datetime.date(datetime.now()-timedelta(days=1)):
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#yesterday
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dts = sn+'gestern_%H-%M-%S'
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# elif snd == datetime.date(datetime.now()-timedelta(days=2)):
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# #day before yesterday
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# dts = 'vorgestern %H-%M-%S'
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else:
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#any day else
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dts = sn+'%Y.%m.%d_%H-%M-%S'
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if self.uroot:
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return datetime.strftime(sndt,dts)+ac+'--'+location
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else:
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return datetime.strftime(sndt,dts)+'--'+location+ac
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else:
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return subvolname+'--'+location
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def __lsnapshots(self):
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if DEBUG: print "ls snapshots"
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self.snapshots.clear()
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for location in self.BDIRS.iterkeys():
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if DEBUG == True: print 'Scan location '+location+': '+self.BDIRS[location]
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try:
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dirents = os.listdir(self.BDIRS[location])
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except:
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continue
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if self.uroot:
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for entry in dirents:
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if os.path.exists(self.BDIRS[location]+'/'+entry) \
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and not os.path.islink(self.BDIRS[location]+'/'+entry):
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self.snapshots[self.translate(entry,location=location)] \
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= [self.BDIRS[location], '/'+entry+'/', location]
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else:
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for entry in dirents:
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if os.path.exists(self.BDIRS[location]+'/'+entry+self.HOME) \
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and not os.path.islink(self.BDIRS[location]+'/'+entry):
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self.snapshots[self.translate(entry,location=location)] \
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= [self.BDIRS[location], '/'+entry+self.HOME+'/', location]
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def __realpath(self,path):
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ss = path.split('/')[1]
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#sv = './'+'/'.join(path.split('/')[2:])
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sv = '/'.join(path.split('/')[2:])
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if path == "/" and (self.root in self.BDIRS.values()):
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return self.root
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elif ss in self.snapshots:
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self.root = self.snapshots[ss][0]
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Xmp.realpath = self.snapshots[ss][0]+self.snapshots[ss][1]
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return self.snapshots[ss][0]+self.snapshots[ss][1]+sv
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else:
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self.root = self.BDIRS['loc']
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Xmp.realpath = self.root + path
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return Xmp.realpath
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def __lsdir(self,path):#
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if DEBUG: print "ls dir"
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ss = path.split('/')[1]
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subdir = '/'+'/'.join(path.split('/')[2:])
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dirents = ['.', '..']
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#if path == "/" and (self.root.strip('/') == self.BDIRS['loc'].strip('/') or self.root == self.BDIRS['ext'].strip('/')):
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if path == "/" and (self.root in self.BDIRS.values()):
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self.root = self.BDIRS['loc']
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dirents.extend(self.snapshots.keys())
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elif ss in self.snapshots or path == "./":
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dirents.extend(os.listdir(self.__realpath(path)))
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else:
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self.root = self.BDIRS['loc']
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dirents.extend(os.listdir(path))
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return dirents
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# def mythread(self):
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#
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# """
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# The beauty of the FUSE python implementation is that with the python interp
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# running in foreground, you can have threads
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# """
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# print "mythread: started"
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# while 1:
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# time.sleep(120)
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# print "mythread: ticking"
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def getattr(self, path):
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return os.lstat(self.__realpath(path))
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if path == "/" and (self.root in self.BDIRS.values()):
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return os.lstat(self.root)
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else:
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return os.lstat(self.__realpath(path))
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def readlink(self, path):
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return os.readlink(self.__realpath(path))
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def readdir(self, path, offset):
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if path == "/" and (self.root in self.BDIRS.values()):
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if DEBUG: print path
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pass
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if path == "/":
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self.__lsnapshots()
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for e in self.__lsdir(path):
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yield fuse.Direntry(e)
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def unlink(self, path):
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return -EROFS
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#os.unlink("." + path)
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def rmdir(self, path):
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return -EROFS
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#os.rmdir("." + path)
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def symlink(self, path, path1):
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return -EROFS
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#os.symlink(path, "." + path1)
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def rename(self, path, path1):
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return -EROFS
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#os.rename("." + path, "." + path1)
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def link(self, path, path1):
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return -EROFS
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#os.link("." + path, "." + path1)
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def chmod(self, path, mode):
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return -EROFS
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#os.chmod("." + path, mode)
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def chown(self, path, user, group):
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return -EROFS
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#os.chown("." + path, user, group)
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def truncate(self, path, len):
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return -EROFS
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#f = open("." + path, "a")
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#f.truncate(len)
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#f.close()
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def mknod(self, path, mode, dev):
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return -EROFS
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#os.mknod("." + path, mode, dev)
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def mkdir(self, path, mode):
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return -EROFS
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#os.mkdir("." + path, mode)
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def utime(self, path, times):
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os.utime(self.__realpath(path), times)
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# The following utimens method would do the same as the above utime method.
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# We can't make it better though as the Python stdlib doesn't know of
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# subsecond preciseness in acces/modify times.
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#
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# def utimens(self, path, ts_acc, ts_mod):
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# os.utime("." + path, (ts_acc.tv_sec, ts_mod.tv_sec))
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def access(self, path, mode):
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if DEBUG: print "access " + path + '||'+str(mode)
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if not os.access(self.__realpath(path), mode):
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return -EACCES
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# This is how we could add stub extended attribute handlers...
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# (We can't have ones which aptly delegate requests to the underlying fs
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# because Python lacks a standard xattr interface.)
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#
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# def getxattr(self, path, name, size):
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# val = name.swapcase() + '@' + path
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# if size == 0:
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# # We are asked for size of the value.
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# return len(val)
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# return val
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#
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# def listxattr(self, path, size):
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# # We use the "user" namespace to please XFS utils
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# aa = ["user." + a for a in ("foo", "bar")]
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# if size == 0:
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# # We are asked for size of the attr list, ie. joint size of attrs
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# # plus null separators.
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# return len("".join(aa)) + len(aa)
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# return aa
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def statfs(self):
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"""
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Should return an object with statvfs attributes (f_bsize, f_frsize...).
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Eg., the return value of os.statvfs() is such a thing (since py 2.2).
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If you are not reusing an existing statvfs object, start with
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fuse.StatVFS(), and define the attributes.
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To provide usable information (ie., you want sensible df(1)
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output, you are suggested to specify the following attributes:
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- f_bsize - preferred size of file blocks, in bytes
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- f_frsize - fundamental size of file blcoks, in bytes
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[if you have no idea, use the same as blocksize]
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- f_blocks - total number of blocks in the filesystem
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- f_bfree - number of free blocks
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- f_files - total number of file inodes
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- f_ffree - nunber of free file inodes
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"""
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return os.statvfs(".")
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def fsinit(self):
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if DEBUG: print "fsinit"
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self.BDIRS={'loc':'/'+self.local.strip('/'),'ext':'/'+self.extern.strip('/')}
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os.chdir('/'+self.local.strip('/'))
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self.__lsnapshots()
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class XmpFile(object):
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def __init__(self, path, flags, *mode):
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path = Xmp.realpath+'/'.join(path.split('/')[2:])
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self.fd = os.open(path, flags, *mode)
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self.file = os.fdopen(self.fd, flag2mode(flags))
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def read(self, length, offset):
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self.file.seek(offset)
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return self.file.read(length)
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def write(self, buf, offset):
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return -EROFS
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self.file.seek(offset)
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self.file.write(buf)
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return len(buf)
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def release(self, flags):
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self.file.close()
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def _fflush(self):
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if 'w' in self.file.mode or 'a' in self.file.mode:
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self.file.flush()
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def fsync(self, isfsyncfile):
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self._fflush()
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if isfsyncfile and hasattr(os, 'fdatasync'):
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os.fdatasync(self.fd)
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else:
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os.fsync(self.fd)
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def flush(self):
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self._fflush()
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# cf. xmp_flush() in fusexmp_fh.c
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os.close(os.dup(self.fd))
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def fgetattr(self):
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return os.fstat(self.fd)
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def ftruncate(self, len):
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return -EROFS
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#self.file.truncate(len)
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def lock(self, cmd, owner, **kw):
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#return -EROFS
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# The code here is much rather just a demonstration of the locking
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# API than something which actually was seen to be useful.
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# Advisory file locking is pretty messy in Unix, and the Python
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# interface to this doesn't make it better.
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# We can't do fcntl(2)/F_GETLK from Python in a platfrom independent
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# way. The following implementation *might* work under Linux.
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#
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# if cmd == fcntl.F_GETLK:
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# import struct
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#
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# lockdata = struct.pack('hhQQi', kw['l_type'], os.SEEK_SET,
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# kw['l_start'], kw['l_len'], kw['l_pid'])
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# ld2 = fcntl.fcntl(self.fd, fcntl.F_GETLK, lockdata)
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# flockfields = ('l_type', 'l_whence', 'l_start', 'l_len', 'l_pid')
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# uld2 = struct.unpack('hhQQi', ld2)
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# res = {}
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# for i in xrange(len(uld2)):
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# res[flockfields[i]] = uld2[i]
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#
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# return fuse.Flock(**res)
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# Convert fcntl-ish lock parameters to Python's weird
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# lockf(3)/flock(2) medley locking API...
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op = { fcntl.F_UNLCK : fcntl.LOCK_UN,
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fcntl.F_RDLCK : fcntl.LOCK_SH,
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fcntl.F_WRLCK : fcntl.LOCK_EX }[kw['l_type']]
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if cmd == fcntl.F_GETLK:
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return -EOPNOTSUPP
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elif cmd == fcntl.F_SETLK:
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if op != fcntl.LOCK_UN:
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op |= fcntl.LOCK_NB
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elif cmd == fcntl.F_SETLKW:
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pass
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else:
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return -EINVAL
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fcntl.lockf(self.fd, op, kw['l_start'], kw['l_len'])
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def main(self, *a, **kw):
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self.file_class = self.XmpFile
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return Fuse.main(self, *a, **kw)
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def main():
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usage = """
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Userspace nullfs-alike: mirror the filesystem tree from some point on.
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""" + Fuse.fusage
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server = Xmp(version="%prog " + fuse.__version__,
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usage=usage,
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dash_s_do='setsingle')
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server.parser.add_option(mountopt="root", metavar="PATH", default=server.local,
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help="mirror filesystem from under PATH [default: %default]")
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server.parser.add_option(mountopt="local", metavar="PATH", default=server.local,
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help="set path to filesystem from internal HDD/SSD under PATH [default: %default]")
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server.parser.add_option(mountopt="extern", metavar="PATH", default=server.extern,
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help="set path to filesystem from external HDD/SSD under PATH [default: %default]")
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server.parser.add_option(mountopt="uroot", metavar="BOOL", default=server.uroot,
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help="""use ist for mounting on /backup for root -
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whole snapshots! BOOL [default: %default]""")
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server.parse(values=server, errex=1)
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try:
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if server.fuse_args.mount_expected():
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os.chdir(server.local)
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except OSError:
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print >> sys.stderr, "can't enter root of underlying filesystem"
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sys.exit(1)
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server.main()
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if __name__ == '__main__':
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main()
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