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# Copyright (C) 2009, Aleksey Lim
#
# 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""Simplify tarfile module usage"""
import os
import time
import tarfile
import cStringIO
import zipfile
import tempfile
import shutil
class TarballError(Exception):
"""Base Tarball exception."""
pass
class BadDataTypeError(TarballError):
"""Exception for unsupported data type in read/write methods."""
pass
class Tarball:
"""
Wrap standart tarfile module to simplify read/write operations.
In read mode Tarball can load zip files as well.
Write usage:
# create Tarball object
# to see all supported modes use
# http://docs.python.org/library/tarfile.html#tarfile.open
tar = Tarball(tarfile, 'w')
# write string to file in tarball
tar.write('name within tarball', 'string to write')
# save and close tarball file
tar.close()
Read usage:
# create Tarball object
tar = Tarball(tarfile)
# read content of file in tarball to string
str_content = tar.read('name within tarball')
"""
def __init__(self, name=None, mode='r', mtime=None):
if not mode.startswith('r') or tarfile.is_tarfile(name):
self.__tar = tarfile.TarFile(name=name, mode=mode)
else:
# convert for tar
if not zipfile.is_zipfile(name):
raise tarfile.ReadError()
try:
tmp_dir = tempfile.mkdtemp()
tmp_fd, tmp_name = tempfile.mkstemp()
tmp_fo = os.fdopen(tmp_fd, 'w')
zip = zipfile.ZipFile(name)
zip.extractall(tmp_dir)
tar = tarfile.TarFile(fileobj=tmp_fo, mode='w')
tar.add(tmp_dir, arcname='')
tar.close()
self.__tar = tarfile.TarFile(name=tmp_name, mode=mode)
finally:
tmp_fo.close()
os.unlink(tmp_name)
shutil.rmtree(tmp_dir)
if mtime:
self.mtime = mtime
else:
self.mtime = time.time()
def close(self):
"""Save(if 'r' mode was given) and close tarball file."""
self.__tar.close()
def getnames(self):
"""Return names of members sorted by creation order."""
return self.__tar.getnames()
def read(self, arcname):
"""Returns sring with content of given file from tarball."""
file_o = self.__tar.extractfile(arcname.encode('utf8'))
if not file_o:
return None
out = file_o.read()
file_o.close()
return out
def write(self, arcname, data, mode=0644):
"""
Stores given object to file in tarball.
Raises BadDataTypeError exception If data type isn't supported.
"""
info = tarfile.TarInfo(arcname.encode('utf8'))
info.mode = mode
info.mtime = self.mtime
info.size = len(data)
self.__tar.addfile(info, cStringIO.StringIO(data))
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