#!/usr/bin/python
# -*- coding: utf-8 -*-
##############################################################################
#
# Copyright (c) 2009 Nexedi SARL and Contributors. All Rights Reserved.
#                    Łukasz Nowak <luke@nexedi.com>
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsability of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# garantees and support are strongly adviced to contract a Free Software
# Service Company
#
# 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
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
##############################################################################

# Allows to shrink ZODB at given TID
# Needs Base64 encoded TID, which can be obtained by dump_tid.py

from base64 import decodestring
import sys
from ZODB.FileStorage import FileStorage


def main():
  filename = sys.argv[1]
  tid = decodestring(sys.argv[2])

  fs = FileStorage(filename, create=False, read_only=True, stop=tid)
  pos = fs.getSize()
  fs.close()

  print 'Will cut %s at position %s...' % (filename, pos)
  f = file(filename,'a').truncate(pos)

if __name__ == '__main__':
  assert len(sys.argv) == 3, 'Requires exactly 2 argument: <filename> <Base 64 tid>'
  sys.exit(main())
