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# File name: backup.py
# Date: 2008/03/14
# Author: Martin Sivak <msivak at redhet dot com>
#
# Copyright (C) Red Hat 2008
#
# 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
# in a file called COPYING along with this program; if not, write to
# the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
# 02139, USA.
from errors import NotImplemented
import os
import shutil
import hashlib
import weakref
import cPickle as pickle
class BackupException(Exception):
pass
class BackupStoreInterface(object):
class Backup:
def __init__(self, id):
raise NotImplemented()
def backupPath(self, path, name = None):
raise NotImplemented()
def backupValue(self, value, name):
raise NotImplemented()
def restoreName(self, name, path = None):
raise NotImplemented()
def restorePath(self, path, name = None):
raise NotImplemented()
def restoreValue(self, name):
raise NotImplemented()
def delete(self, name):
raise NotImplemented()
def cleanup(self):
raise NotImplemented()
def exists(self, name = None, path = None):
raise NotImplemented()
def __init__(self):
raise NotImplemented()
def getBackup(self, id):
raise NotImplemented()
def closeBackup(self, id):
raise NotImplemented()
def __del__(self):
raise NotImplemented()
class FileBackupStore(BackupStoreInterface):
_singleton = None
class Backup(BackupStoreInterface.Backup):
def __init__(self, id, path):
self._id = id
self._path = path
self._data = {} # name -> (stored as, origin)
self._origin = {} # origin -> name
os.makedirs(self._path)
def backupPath(self, path, name = None):
if name is None:
name = path
if self._origin.has_key(path):
raise BackupException("Path %s already in the backup store %s!" % (path,self._id))
if self._data.has_key(name):
raise BackupException("Named backup %s already in the backup store %s!" % (name,self._id))
stored = hashlib.sha224(name).hexdigest()
if os.path.isdir(path):
shutil.copytree(path, os.path.join(self._path, stored), symlinks = True)
else:
shutil.copy2(path, os.path.join(self._path, stored))
self._origin[path] = name
self._data[name] = (stored, path)
return True
def backupValue(self, value, name):
if self._data.has_key(name):
raise BackupException("Named backup %s already in the backup store %s!" % (name,self._id))
stored = hashlib.sha224(name).hexdigest()
f = open(os.path.join(self._path, stored), "wb")
pickle.dump(value, f, pickle.HIGHEST_PROTOCOL)
f.close()
self._data[name] = (stored, None)
return True
def restoreValue(self, name):
stored, origin = self._data[name]
if origin is not None:
raise BackupException("Named backup %s is not a value object!" % (name,))
f = open(os.path.join(self._path, stored), "rb")
val = pickle.load(f)
f.close()
return val
def restoreName(self, name, path = None):
stored, origin = self._data[name]
if origin is None:
raise BackupException("Named backup %s is not a filesystem object!" % (name,))
assert self._origin[name]==origin
if path is None:
path = origin
if os.path.exists(path):
if os.path.isdir(path):
shutil.rmtree(path)
else:
os.unlink(path)
stored = os.path.join(self._path, stored)
if os.path.isdir(stored):
shutil.copytree(stored, path, symlinks = True)
else:
shutil.copy2(stored, path)
return True
def restorePath(self, path, name = None):
assert self._data[self._origin[path]][1]==path
if name is None:
name = self._origin[path]
return self.restoreName(name, path)
def delete(self, name):
stored, origin = self._data[name]
stored = os.path.join(self._path, stored)
if os.path.isdir(stored):
shutil.rmtree(stored)
else:
os.unlink(stored)
del self._data[name]
if origin is not None:
del self._origin[origin]
return True
def cleanup(self):
for name,(stored,origin) in self._data.iteritems():
self.delete(name)
os.rmdir(self._path)
def exists(self, name=None, path=None):
if name == None and path == None:
raise BackupException("Cannot call the exists method with both the arguments equal to None")
if name != None and path != None:
try:
if self._data[name] == path:
return True
else:
return False
except KeyError:
return False
if name != None and self._data.has_key(name):
return True
if path != None and self._origin.has_key(path):
return True
return False
def __init__(self, path):
if self.__class__._singleton:
raise BackupException("BackupStore with %s type can have only one instance" % (self.__name__,))
assert self.__class__._singleton==None
self._path = path
self._backups = {}
if os.path.isdir(self._path):
raise BackupException("Backupdir %s already exists. Erase dir or change backup dir." % self._path)
else:
os.makedirs(self._path)
self.__class__._singleton = weakref.proxy(self)
print("Backup system initialized")
def getBackup(self, id):
if not self._backups.has_key(id):
self._backups[id] = self.Backup(id, self._path+"/"+id+"/")
return self._backups[id]
def closeBackup(self, id):
if not self._backups.has_key(id):
raise BackupException("Backup with id %s does not exist" % (id,))
self._backups[id].cleanup()
del self._backups[id]
def __del__(self):
if self.__class__._singleton is None:
return
for id,backup in self._backups.iteritems():
backup.cleanup()
os.rmdir(self._path)
print("Backup closed")
@classmethod
def get(cls, path):
if cls._singleton:
return cls._singleton
else:
return cls(path)
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