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Diffstat (limited to 'Lib/tarfile.py')
| -rw-r--r-- | Lib/tarfile.py | 1927 |
1 files changed, 1927 insertions, 0 deletions
diff --git a/Lib/tarfile.py b/Lib/tarfile.py new file mode 100644 index 0000000..3e334be --- /dev/null +++ b/Lib/tarfile.py @@ -0,0 +1,1927 @@ +#!/usr/bin/env python +# -*- coding: iso-8859-1 -*- +#------------------------------------------------------------------- +# tarfile.py +#------------------------------------------------------------------- +# Copyright (C) 2002 Lars Gustäbel <lars@gustaebel.de> +# All rights reserved. +# +# Permission is hereby granted, free of charge, to any person +# obtaining a copy of this software and associated documentation +# files (the "Software"), to deal in the Software without +# restriction, including without limitation the rights to use, +# copy, modify, merge, publish, distribute, sublicense, and/or sell +# copies of the Software, and to permit persons to whom the +# Software is furnished to do so, subject to the following +# conditions: +# +# The above copyright notice and this permission notice shall be +# included in all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES +# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT +# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, +# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +# OTHER DEALINGS IN THE SOFTWARE. +# +"""Read from and write to tar format archives. +""" + +__version__ = "$Revision$" +# $Source$ + +version = "0.6.4" +__author__ = "Lars Gustäbel (lars@gustaebel.de)" +__date__ = "$Date$" +__cvsid__ = "$Id$" +__credits__ = "Gustavo Niemeyer, Niels Gustäbel, Richard Townsend." + +#--------- +# Imports +#--------- +import sys +import os +import shutil +import stat +import errno +import time +import struct + +try: + import grp, pwd +except ImportError: + grp = pwd = None + +# from tarfile import * +__all__ = ["TarFile", "TarInfo", "is_tarfile", "TarError"] + +#--------------------------------------------------------- +# tar constants +#--------------------------------------------------------- +NUL = "\0" # the null character +BLOCKSIZE = 512 # length of processing blocks +RECORDSIZE = BLOCKSIZE * 20 # length of records +MAGIC = "ustar" # magic tar string +VERSION = "00" # version number + +LENGTH_NAME = 100 # maximum length of a filename +LENGTH_LINK = 100 # maximum length of a linkname +LENGTH_PREFIX = 155 # maximum length of the prefix field +MAXSIZE_MEMBER = 077777777777L # maximum size of a file (11 octal digits) + +REGTYPE = "0" # regular file +AREGTYPE = "\0" # regular file +LNKTYPE = "1" # link (inside tarfile) +SYMTYPE = "2" # symbolic link +CHRTYPE = "3" # character special device +BLKTYPE = "4" # block special device +DIRTYPE = "5" # directory +FIFOTYPE = "6" # fifo special device +CONTTYPE = "7" # contiguous file + +GNUTYPE_LONGNAME = "L" # GNU tar extension for longnames +GNUTYPE_LONGLINK = "K" # GNU tar extension for longlink +GNUTYPE_SPARSE = "S" # GNU tar extension for sparse file + +#--------------------------------------------------------- +# tarfile constants +#--------------------------------------------------------- +SUPPORTED_TYPES = (REGTYPE, AREGTYPE, LNKTYPE, # file types that tarfile + SYMTYPE, DIRTYPE, FIFOTYPE, # can cope with. + CONTTYPE, CHRTYPE, BLKTYPE, + GNUTYPE_LONGNAME, GNUTYPE_LONGLINK, + GNUTYPE_SPARSE) + +REGULAR_TYPES = (REGTYPE, AREGTYPE, # file types that somehow + CONTTYPE, GNUTYPE_SPARSE) # represent regular files + +#--------------------------------------------------------- +# Bits used in the mode field, values in octal. +#--------------------------------------------------------- +S_IFLNK = 0120000 # symbolic link +S_IFREG = 0100000 # regular file +S_IFBLK = 0060000 # block device +S_IFDIR = 0040000 # directory +S_IFCHR = 0020000 # character device +S_IFIFO = 0010000 # fifo + +TSUID = 04000 # set UID on execution +TSGID = 02000 # set GID on execution +TSVTX = 01000 # reserved + +TUREAD = 0400 # read by owner +TUWRITE = 0200 # write by owner +TUEXEC = 0100 # execute/search by owner +TGREAD = 0040 # read by group +TGWRITE = 0020 # write by group +TGEXEC = 0010 # execute/search by group +TOREAD = 0004 # read by other +TOWRITE = 0002 # write by other +TOEXEC = 0001 # execute/search by other + +#--------------------------------------------------------- +# Some useful functions +#--------------------------------------------------------- +def nts(s): + """Convert a null-terminated string buffer to a python string. + """ + return s.split(NUL, 1)[0] + +def calc_chksum(buf): + """Calculate the checksum for a member's header. It's a simple addition + of all bytes, treating the chksum field as if filled with spaces. + buf is a 512 byte long string buffer which holds the header. + """ + chk = 256 # chksum field is treated as blanks, + # so the initial value is 8 * ord(" ") + for c in buf[:148]: chk += ord(c) # sum up all bytes before chksum + for c in buf[156:]: chk += ord(c) # sum up all bytes after chksum + return chk + +def copyfileobj(src, dst, length=None): + """Copy length bytes from fileobj src to fileobj dst. + If length is None, copy the entire content. + """ + if length == 0: + return + if length is None: + shutil.copyfileobj(src, dst) + return + + BUFSIZE = 16 * 1024 + blocks, remainder = divmod(length, BUFSIZE) + for b in xrange(blocks): + buf = src.read(BUFSIZE) + if len(buf) < BUFSIZE: + raise IOError, "end of file reached" + dst.write(buf) + + if remainder != 0: + buf = src.read(remainder) + if len(buf) < remainder: + raise IOError, "end of file reached" + dst.write(buf) + return + +filemode_table = ( + (S_IFLNK, "l", + S_IFREG, "-", + S_IFBLK, "b", + S_IFDIR, "d", + S_IFCHR, "c", + S_IFIFO, "p"), + (TUREAD, "r"), + (TUWRITE, "w"), + (TUEXEC, "x", TSUID, "S", TUEXEC|TSUID, "s"), + (TGREAD, "r"), + (TGWRITE, "w"), + (TGEXEC, "x", TSGID, "S", TGEXEC|TSGID, "s"), + (TOREAD, "r"), + (TOWRITE, "w"), + (TOEXEC, "x", TSVTX, "T", TOEXEC|TSVTX, "t")) + +def filemode(mode): + """Convert a file's mode to a string of the form + -rwxrwxrwx. + Used by TarFile.list() + """ + s = "" + for t in filemode_table: + while True: + if mode & t[0] == t[0]: + s += t[1] + elif len(t) > 2: + t = t[2:] + continue + else: + s += "-" + break + return s + +if os.sep != "/": + normpath = lambda path: os.path.normpath(path).replace(os.sep, "/") +else: + normpath = os.path.normpath + +class TarError(Exception): + """Base exception.""" + pass +class ExtractError(TarError): + """General exception for extract errors.""" + pass +class ReadError(TarError): + """Exception for unreadble tar archives.""" + pass +class CompressionError(TarError): + """Exception for unavailable compression methods.""" + pass +class StreamError(TarError): + """Exception for unsupported operations on stream-like TarFiles.""" + pass + +#--------------------------- +# internal stream interface +#--------------------------- +class _LowLevelFile: + """Low-level file object. Supports reading and writing. + It is used instead of a regular file object for streaming + access. + """ + + def __init__(self, name, mode): + mode = { + "r": os.O_RDONLY, + "w": os.O_WRONLY | os.O_CREAT | os.O_TRUNC, + }[mode] + if hasattr(os, "O_BINARY"): + mode |= os.O_BINARY + self.fd = os.open(name, mode) + + def close(self): + os.close(self.fd) + + def read(self, size): + return os.read(self.fd, size) + + def write(self, s): + os.write(self.fd, s) + +class _Stream: + """Class that serves as an adapter between TarFile and + a stream-like object. The stream-like object only + needs to have a read() or write() method and is accessed + blockwise. Use of gzip or bzip2 compression is possible. + A stream-like object could be for example: sys.stdin, + sys.stdout, a socket, a tape device etc. + + _Stream is intended to be used only internally. + """ + + def __init__(self, name, mode, type, fileobj, bufsize): + """Construct a _Stream object. + """ + self._extfileobj = True + if fileobj is None: + fileobj = _LowLevelFile(name, mode) + self._extfileobj = False + + self.name = name or "" + self.mode = mode + self.type = type + self.fileobj = fileobj + self.bufsize = bufsize + self.buf = "" + self.pos = 0L + self.closed = False + + if type == "gz": + try: + import zlib + except ImportError: + raise CompressionError, "zlib module is not available" + self.zlib = zlib + self.crc = zlib.crc32("") + if mode == "r": + self._init_read_gz() + else: + self._init_write_gz() + + if type == "bz2": + try: + import bz2 + except ImportError: + raise CompressionError, "bz2 module is not available" + if mode == "r": + self.dbuf = "" + self.cmp = bz2.BZ2Decompressor() + else: + self.cmp = bz2.BZ2Compressor() + + def __del__(self): + if not self.closed: + self.close() + + def _init_write_gz(self): + """Initialize for writing with gzip compression. + """ + self.cmp = self.zlib.compressobj(9, self.zlib.DEFLATED, + -self.zlib.MAX_WBITS, + self.zlib.DEF_MEM_LEVEL, + 0) + timestamp = struct.pack("<L", long(time.time())) + self.__write("\037\213\010\010%s\002\377" % timestamp) + if self.name.endswith(".gz"): + self.name = self.name[:-3] + self.__write(self.name + NUL) + + def write(self, s): + """Write string s to the stream. + """ + if self.type == "gz": + self.crc = self.zlib.crc32(s, self.crc) + self.pos += len(s) + if self.type != "tar": + s = self.cmp.compress(s) + self.__write(s) + + def __write(self, s): + """Write string s to the stream if a whole new block + is ready to be written. + """ + self.buf += s + while len(self.buf) > self.bufsize: + self.fileobj.write(self.buf[:self.bufsize]) + self.buf = self.buf[self.bufsize:] + + def close(self): + """Close the _Stream object. No operation should be + done on it afterwards. + """ + if self.closed: + return + + if self.mode == "w" and self.buf: + if self.type != "tar": + self.buf += self.cmp.flush() + self.fileobj.write(self.buf) + self.buf = "" + if self.type == "gz": + self.fileobj.write(struct.pack("<l", self.crc)) + self.fileobj.write(struct.pack("<L", self.pos)) + + if not self._extfileobj: + self.fileobj.close() + + self.closed = True + + def _init_read_gz(self): + """Initialize for reading a gzip compressed fileobj. + """ + self.cmp = self.zlib.decompressobj(-self.zlib.MAX_WBITS) + self.dbuf = "" + + # taken from gzip.GzipFile with some alterations + if self.__read(2) != "\037\213": + raise ReadError, "not a gzip file" + if self.__read(1) != "\010": + raise CompressionError, "unsupported compression method" + + flag = ord(self.__read(1)) + self.__read(6) + + if flag & 4: + xlen = ord(self.__read(1)) + 256 * ord(self.__read(1)) + self.read(xlen) + if flag & 8: + while True: + s = self.__read(1) + if not s or s == NUL: + break + if flag & 16: + while True: + s = self.__read(1) + if not s or s == NUL: + break + if flag & 2: + self.__read(2) + + def tell(self): + """Return the stream's file pointer position. + """ + return self.pos + + def seek(self, pos=0): + """Set the stream's file pointer to pos. Negative seeking + is forbidden. + """ + if pos - self.pos >= 0: + blocks, remainder = divmod(pos - self.pos, self.bufsize) + for i in xrange(blocks): + self.read(self.bufsize) + self.read(remainder) + else: + raise StreamError, "seeking backwards is not allowed" + return self.pos + + def read(self, size=None): + """Return the next size number of bytes from the stream. + If size is not defined, return all bytes of the stream + up to EOF. + """ + if size is None: + t = [] + while True: + buf = self._read(self.bufsize) + if not buf: + break + t.append(buf) + buf = "".join(t) + else: + buf = self._read(size) + self.pos += len(buf) + return buf + + def _read(self, size): + """Return size bytes from the stream. + """ + if self.type == "tar": + return self.__read(size) + + c = len(self.dbuf) + t = [self.dbuf] + while c < size: + buf = self.__read(self.bufsize) + if not buf: + break + buf = self.cmp.decompress(buf) + t.append(buf) + c += len(buf) + t = "".join(t) + self.dbuf = t[size:] + return t[:size] + + def __read(self, size): + """Return size bytes from stream. If internal buffer is empty, + read another block from the stream. + """ + c = len(self.buf) + t = [self.buf] + while c < size: + buf = self.fileobj.read(self.bufsize) + if not buf: + break + t.append(buf) + c += len(buf) + t = "".join(t) + self.buf = t[size:] + return t[:size] +# class _Stream + +#------------------------ +# Extraction file object +#------------------------ +class ExFileObject(object): + """File-like object for reading an archive member. + Is returned by TarFile.extractfile(). Support for + sparse files included. + """ + + def __init__(self, tarfile, tarinfo): + self.fileobj = tarfile.fileobj + self.name = tarinfo.name + self.mode = "r" + self.closed = False + self.offset = tarinfo.offset_data + self.size = tarinfo.size + self.pos = 0L + self.linebuffer = "" + if tarinfo.issparse(): + self.sparse = tarinfo.sparse + self.read = self._readsparse + else: + self.read = self._readnormal + + def __read(self, size): + """Overloadable read method. + """ + return self.fileobj.read(size) + + def readline(self, size=-1): + """Read a line with approx. size. If size is negative, + read a whole line. readline() and read() must not + be mixed up (!). + """ + if size < 0: + size = sys.maxint + + nl = self.linebuffer.find("\n") + if nl >= 0: + nl = min(nl, size) + else: + size -= len(self.linebuffer) + while nl < 0: + buf = self.read(min(size, 100)) + if not buf: + break + self.linebuffer += buf + size -= len(buf) + if size <= 0: + break + nl = self.linebuffer.find("\n") + if nl == -1: + s = self.linebuffer + self.linebuffer = "" + return s + buf = self.linebuffer[:nl] + self.linebuffer = self.linebuffer[nl + 1:] + while buf[-1:] == "\r": + buf = buf[:-1] + return buf + "\n" + + def readlines(self): + """Return a list with all (following) lines. + """ + result = [] + while True: + line = self.readline() + if not line: break + result.append(line) + return result + + def _readnormal(self, size=None): + """Read operation for regular files. + """ + if self.closed: + raise ValueError, "file is closed" + self.fileobj.seek(self.offset + self.pos) + bytesleft = self.size - self.pos + if size is None: + bytestoread = bytesleft + else: + bytestoread = min(size, bytesleft) + self.pos += bytestoread + return self.__read(bytestoread) + + def _readsparse(self, size=None): + """Read operation for sparse files. + """ + if self.closed: + raise ValueError, "file is closed" + + if size is None: + size = self.size - self.pos + + data = [] + while size > 0: + buf = self._readsparsesection(size) + if not buf: + break + size -= len(buf) + data.append(buf) + return "".join(data) + + def _readsparsesection(self, size): + """Read a single section of a sparse file. + """ + section = self.sparse.find(self.pos) + + if section is None: + return "" + + toread = min(size, section.offset + section.size - self.pos) + if isinstance(section, _data): + realpos = section.realpos + self.pos - section.offset + self.pos += toread + self.fileobj.seek(self.offset + realpos) + return self.__read(toread) + else: + self.pos += toread + return NUL * toread + + def tell(self): + """Return the current file position. + """ + return self.pos + + def seek(self, pos, whence=0): + """Seek to a position in the file. + """ + self.linebuffer = "" + if whence == 0: + self.pos = min(max(pos, 0), self.size) + if whence == 1: + if pos < 0: + self.pos = max(self.pos + pos, 0) + else: + self.pos = min(self.pos + pos, self.size) + if whence == 2: + self.pos = max(min(self.size + pos, self.size), 0) + + def close(self): + """Close the file object. + """ + self.closed = True +#class ExFileObject + +#------------------ +# Exported Classes +#------------------ +class TarInfo(object): + """Informational class which holds the details about an + archive member given by a tar header block. + TarInfo objects are returned by TarFile.getmember(), + TarFile.getmembers() and TarFile.gettarinfo() and are + usually created internally. + """ + + def __init__(self, name=""): + """Construct a TarInfo object. name is the optional name + of the member. + """ + + self.name = name # member name (dirnames must end with '/') + self.mode = 0666 # file permissions + self.uid = 0 # user id + self.gid = 0 # group id + self.size = 0 # file size + self.mtime = 0 # modification time + self.chksum = 0 # header checksum + self.type = REGTYPE # member type + self.linkname = "" # link name + self.uname = "user" # user name + self.gname = "group" # group name + self.devmajor = 0 #- + self.devminor = 0 #-for use with CHRTYPE and BLKTYPE + self.prefix = "" # prefix to filename or holding information + # about sparse files + + self.offset = 0 # the tar header starts here + self.offset_data = 0 # the file's data starts here + + def __repr__(self): + return "<%s %r at %#x>" % (self.__class__.__name__,self.name,id(self)) + + def frombuf(cls, buf): + """Construct a TarInfo object from a 512 byte string buffer. + """ + tarinfo = cls() + tarinfo.name = nts(buf[0:100]) + tarinfo.mode = int(buf[100:108], 8) + tarinfo.uid = int(buf[108:116],8) + tarinfo.gid = int(buf[116:124],8) + tarinfo.size = long(buf[124:136], 8) + tarinfo.mtime = long(buf[136:148], 8) + tarinfo.chksum = int(buf[148:156], 8) + tarinfo.type = buf[156:157] + tarinfo.linkname = nts(buf[157:257]) + tarinfo.uname = nts(buf[265:297]) + tarinfo.gname = nts(buf[297:329]) + try: + tarinfo.devmajor = int(buf[329:337], 8) + tarinfo.devminor = int(buf[337:345], 8) + except ValueError: + tarinfo.devmajor = tarinfo.devmajor = 0 + + # The prefix field is used for filenames > 100 in + # the POSIX standard. + # name = prefix + "/" + name + prefix = buf[345:500] + while prefix and prefix[-1] == NUL: + prefix = prefix[:-1] + if len(prefix.split(NUL)) == 1: + tarinfo.prefix = prefix + tarinfo.name = normpath(os.path.join(tarinfo.prefix, tarinfo.name)) + else: + tarinfo.prefix = buf[345:500] + + # Directory names should have a '/' at the end. + if tarinfo.isdir() and tarinfo.name[-1:] != "/": + tarinfo.name += "/" + return tarinfo + + frombuf = classmethod(frombuf) + + def tobuf(self): + """Return a tar header block as a 512 byte string. + """ + name = self.name + + # The following code was contributed by Detlef Lannert. + parts = [] + for value, fieldsize in ( + (name, 100), + ("%07o" % (self.mode & 07777), 8), + ("%07o" % self.uid, 8), + ("%07o" % self.gid, 8), + ("%011o" % self.size, 12), + ("%011o" % self.mtime, 12), + (" ", 8), + (self.type, 1), + (self.linkname, 100), + (MAGIC, 6), + (VERSION, 2), + (self.uname, 32), + (self.gname, 32), + ("%07o" % self.devmajor, 8), + ("%07o" % self.devminor, 8), + (self.prefix, 155) + ): + l = len(value) + parts.append(value + (fieldsize - l) * NUL) + + buf = "".join(parts) + chksum = calc_chksum(buf) + buf = buf[:148] + "%06o\0" % chksum + buf[155:] + buf += (BLOCKSIZE - len(buf)) * NUL + self.buf = buf + return buf + + def isreg(self): + return self.type in REGULAR_TYPES + def isfile(self): + return self.isreg() + def isdir(self): + return self.type == DIRTYPE + def issym(self): + return self.type == SYMTYPE + def islnk(self): + return self.type == LNKTYPE + def ischr(self): + return self.type == CHRTYPE + def isblk(self): + return self.type == BLKTYPE + def isfifo(self): + return self.type == FIFOTYPE + def issparse(self): + return self.type == GNUTYPE_SPARSE + def isdev(self): + return self.type in (CHRTYPE, BLKTYPE, FIFOTYPE) +# class TarInfo + +class TarFile(object): + """The TarFile Class provides an interface to tar archives. + """ + + debug = 0 # May be set from 0 (no msgs) to 3 (all msgs) + + dereference = False # If true, add content of linked file to the + # tar file, else the link. + + ignore_zeros = False # If true, skips empty or invalid blocks and + # continues processing. + + errorlevel = 0 # If 0, fatal errors only appear in debug + # messages (if debug >= 0). If > 0, errors + # are passed to the caller as exceptions. + + posix = True # If True, generates POSIX.1-1990-compliant + # archives (no GNU extensions!) + + fileobject = ExFileObject + + def __init__(self, name=None, mode="r", fileobj=None): + """Open an (uncompressed) tar archive `name'. `mode' is either 'r' to + read from an existing archive, 'a' to append data to an existing + file or 'w' to create a new file overwriting an existing one. `mode' + defaults to 'r'. + If `fileobj' is given, it is used for reading or writing data. If it + can be determined, `mode' is overridden by `fileobj's mode. + `fileobj' is not closed, when TarFile is closed. + """ + self.name = name + + if len(mode) > 1 or mode not in "raw": + raise ValueError, "mode must be 'r', 'a' or 'w'" + self._mode = mode + self.mode = {"r": "rb", "a": "r+b", "w": "wb"}[mode] + + if not fileobj: + fileobj = file(self.name, self.mode) + self._extfileobj = False + else: + if self.name is None and hasattr(fileobj, "name"): + self.name = fileobj.name + if hasattr(fileobj, "mode"): + self.mode = fileobj.mode + self._extfileobj = True + self.fileobj = fileobj + + # Init datastructures + self.closed = False + self.members = [] # list of members as TarInfo objects + self.membernames = [] # names of members + self.chunks = [0] # chunk cache + self._loaded = False # flag if all members have been read + self.offset = 0L # current position in the archive file + self.inodes = {} # dictionary caching the inodes of + # archive members already added + + if self._mode == "r": + self.firstmember = None + self.firstmember = self.next() + + if self._mode == "a": + # Move to the end of the archive, + # before the first empty block. + self.firstmember = None + while True: + try: + tarinfo = self.next() + except ReadError: + self.fileobj.seek(0) + break + if tarinfo is None: + self.fileobj.seek(- BLOCKSIZE, 1) + break + + if self._mode in "aw": + self._loaded = True + + #-------------------------------------------------------------------------- + # Below are the classmethods which act as alternate constructors to the + # TarFile class. The open() method is the only one that is needed for + # public use; it is the "super"-constructor and is able to select an + # adequate "sub"-constructor for a particular compression using the mapping + # from OPEN_METH. + # + # This concept allows one to subclass TarFile without losing the comfort of + # the super-constructor. A sub-constructor is registered and made available + # by adding it to the mapping in OPEN_METH. + + def open(cls, name=None, mode="r", fileobj=None, bufsize=20*512): + """Open a tar archive for reading, writing or appending. Return + an appropriate TarFile class. + + mode: + 'r' open for reading with transparent compression + 'r:' open for reading exclusively uncompressed + 'r:gz' open for reading with gzip compression + 'r:bz2' open for reading with bzip2 compression + 'a' or 'a:' open for appending + 'w' or 'w:' open for writing without compression + 'w:gz' open for writing with gzip compression + 'w:bz2' open for writing with bzip2 compression + 'r|' open an uncompressed stream of tar blocks for reading + 'r|gz' open a gzip compressed stream of tar blocks + 'r|bz2' open a bzip2 compressed stream of tar blocks + 'w|' open an uncompressed stream for writing + 'w|gz' open a gzip compressed stream for writing + 'w|bz2' open a bzip2 compressed stream for writing + """ + + if not name and not fileobj: + raise ValueError, "nothing to open" + + if ":" in mode: + filemode, comptype = mode.split(":", 1) + filemode = filemode or "r" + comptype = comptype or "tar" + + # Select the *open() function according to + # given compression. + if comptype in cls.OPEN_METH: + func = getattr(cls, cls.OPEN_METH[comptype]) + else: + raise CompressionError, "unknown compression type %r" % comptype + return func(name, filemode, fileobj) + + elif "|" in mode: + filemode, comptype = mode.split("|", 1) + filemode = filemode or "r" + comptype = comptype or "tar" + + if filemode not in "rw": + raise ValueError, "mode must be 'r' or 'w'" + + t = cls(name, filemode, + _Stream(name, filemode, comptype, fileobj, bufsize)) + t._extfileobj = False + return t + + elif mode == "r": + # Find out which *open() is appropriate for opening the file. + for comptype in cls.OPEN_METH: + func = getattr(cls, cls.OPEN_METH[comptype]) + try: + return func(name, "r", fileobj) + except (ReadError, CompressionError): + continue + raise ReadError, "file could not be opened successfully" + + elif mode in "aw": + return cls.taropen(name, mode, fileobj) + + raise ValueError, "undiscernible mode" + + open = classmethod(open) + + def taropen(cls, name, mode="r", fileobj=None): + """Open uncompressed tar archive name for reading or writing. + """ + if len(mode) > 1 or mode not in "raw": + raise ValueError, "mode must be 'r', 'a' or 'w'" + return cls(name, mode, fileobj) + + taropen = classmethod(taropen) + + def gzopen(cls, name, mode="r", fileobj=None, compresslevel=9): + """Open gzip compressed tar archive name for reading or writing. + Appending is not allowed. + """ + if len(mode) > 1 or mode not in "rw": + raise ValueError, "mode must be 'r' or 'w'" + + try: + import gzip + except ImportError: + raise CompressionError, "gzip module is not available" + + pre, ext = os.path.splitext(name) + pre = os.path.basename(pre) + if ext == ".tgz": + ext = ".tar" + if ext == ".gz": + ext = "" + tarname = pre + ext + + if fileobj is None: + fileobj = file(name, mode + "b") + + if mode != "r": + name = tarname + + try: + t = cls.taropen(tarname, mode, + gzip.GzipFile(name, mode, compresslevel, fileobj) + ) + except IOError: + raise ReadError, "not a gzip file" + t._extfileobj = False + return t + + gzopen = classmethod(gzopen) + + def bz2open(cls, name, mode="r", fileobj=None, compresslevel=9): + """Open bzip2 compressed tar archive name for reading or writing. + Appending is not allowed. + """ + if len(mode) > 1 or mode not in "rw": + raise ValueError, "mode must be 'r' or 'w'." + + try: + import bz2 + except ImportError: + raise CompressionError, "bz2 module is not available" + + pre, ext = os.path.splitext(name) + pre = os.path.basename(pre) + if ext == ".tbz2": + ext = ".tar" + if ext == ".bz2": + ext = "" + tarname = pre + ext + + if fileobj is not None: + raise ValueError, "no support for external file objects" + + try: + t = cls.taropen(tarname, mode, bz2.BZ2File(name, mode, compresslevel=compresslevel)) + except IOError: + raise ReadError, "not a bzip2 file" + t._extfileobj = False + return t + + bz2open = classmethod(bz2open) + + # All *open() methods are registered here. + OPEN_METH = { + "tar": "taropen", # uncompressed tar + "gz": "gzopen", # gzip compressed tar + "bz2": "bz2open" # bzip2 compressed tar + } + + #-------------------------------------------------------------------------- + # The public methods which TarFile provides: + + def close(self): + """Close the TarFile. In write-mode, two finishing zero blocks are + appended to the archive. + """ + if self.closed: + return + + if self._mode in "aw": + self.fileobj.write(NUL * (BLOCKSIZE * 2)) + self.offset += (BLOCKSIZE * 2) + # fill up the end with zero-blocks + # (like option -b20 for tar does) + blocks, remainder = divmod(self.offset, RECORDSIZE) + if remainder > 0: + self.fileobj.write(NUL * (RECORDSIZE - remainder)) + + if not self._extfileobj: + self.fileobj.close() + self.closed = True + + def getmember(self, name): + """Return a TarInfo object for member `name'. If `name' can not be + found in the archive, KeyError is raised. If a member occurs more + than once in the archive, its last occurence is assumed to be the + most up-to-date version. + """ + self._check() + if name not in self.membernames and not self._loaded: + self._load() + if name not in self.membernames: + raise KeyError, "filename %r not found" % name + return self._getmember(name) + + def getmembers(self): + """Return the members of the archive as a list of TarInfo objects. The + list has the same order as the members in the archive. + """ + self._check() + if not self._loaded: # if we want to obtain a list of + self._load() # all members, we first have to + # scan the whole archive. + return self.members + + def getnames(self): + """Return the members of the archive as a list of their names. It has + the same order as the list returned by getmembers(). + """ + self._check() + if not self._loaded: + self._load() + return self.membernames + + def gettarinfo(self, name=None, arcname=None, fileobj=None): + """Create a TarInfo object for either the file `name' or the file + object `fileobj' (using os.fstat on its file descriptor). You can + modify some of the TarInfo's attributes before you add it using + addfile(). If given, `arcname' specifies an alternative name for the + file in the archive. + """ + self._check("aw") + + # When fileobj is given, replace name by + # fileobj's real name. + if fileobj is not None: + name = fileobj.name + + # Building the name of the member in the archive. + # Backward slashes are converted to forward slashes, + # Absolute paths are turned to relative paths. + if arcname is None: + arcname = name + arcname = normpath(arcname) + drv, arcname = os.path.splitdrive(arcname) + while arcname[0:1] == "/": + arcname = arcname[1:] + + # Now, fill the TarInfo object with + # information specific for the file. + tarinfo = TarInfo() + + # Use os.stat or os.lstat, depending on platform + # and if symlinks shall be resolved. + if fileobj is None: + if hasattr(os, "lstat") and not self.dereference: + statres = os.lstat(name) + else: + statres = os.stat(name) + else: + statres = os.fstat(fileobj.fileno()) + linkname = "" + + stmd = statres.st_mode + if stat.S_ISREG(stmd): + inode = (statres.st_ino, statres.st_dev) + if inode in self.inodes and not self.dereference: + # Is it a hardlink to an already + # archived file? + type = LNKTYPE + linkname = self.inodes[inode] + else: + # The inode is added only if its valid. + # For win32 it is always 0. + type = REGTYPE + if inode[0]: + self.inodes[inode] = arcname + elif stat.S_ISDIR(stmd): + type = DIRTYPE + if arcname[-1:] != "/": + arcname += "/" + elif stat.S_ISFIFO(stmd): + type = FIFOTYPE + elif stat.S_ISLNK(stmd): + type = SYMTYPE + linkname = os.readlink(name) + elif stat.S_ISCHR(stmd): + type = CHRTYPE + elif stat.S_ISBLK(stmd): + type = BLKTYPE + else: + return None + + # Fill the TarInfo object with all + # information we can get. + tarinfo.name = arcname + tarinfo.mode = stmd + tarinfo.uid = statres.st_uid + tarinfo.gid = statres.st_gid + tarinfo.size = statres.st_size + tarinfo.mtime = statres.st_mtime + tarinfo.type = type + tarinfo.linkname = linkname + if pwd: + try: + tarinfo.uname = pwd.getpwuid(tarinfo.uid)[0] + except KeyError: + pass + if grp: + try: + tarinfo.gname = grp.getgrgid(tarinfo.gid)[0] + except KeyError: + pass + + if type in (CHRTYPE, BLKTYPE): + if hasattr(os, "major") and hasattr(os, "minor"): + tarinfo.devmajor = os.major(statres.st_rdev) + tarinfo.devminor = os.minor(statres.st_rdev) + return tarinfo + + def list(self, verbose=True): + """Print a table of contents to sys.stdout. If `verbose' is False, only + the names of the members are printed. If it is True, an `ls -l'-like + output is produced. + """ + self._check() + + for tarinfo in self: + if verbose: + print filemode(tarinfo.mode), + print "%s/%s" % (tarinfo.uname or tarinfo.uid, + tarinfo.gname or tarinfo.gid), + if tarinfo.ischr() or tarinfo.isblk(): + print "%10s" % ("%d,%d" \ + % (tarinfo.devmajor, tarinfo.devminor)), + else: + print "%10d" % tarinfo.size, + print "%d-%02d-%02d %02d:%02d:%02d" \ + % time.localtime(tarinfo.mtime)[:6], + + print tarinfo.name, + + if verbose: + if tarinfo.issym(): + print "->", tarinfo.linkname, + if tarinfo.islnk(): + print "link to", tarinfo.linkname, + print + + def add(self, name, arcname=None, recursive=True): + """Add the file `name' to the archive. `name' may be any type of file + (directory, fifo, symbolic link, etc.). If given, `arcname' + specifies an alternative name for the file in the archive. + Directories are added recursively by default. This can be avoided by + setting `recursive' to False. + """ + self._check("aw") + + if arcname is None: + arcname = name + + # Skip if somebody tries to archive the archive... + if self.name is not None \ + and os.path.abspath(name) == os.path.abspath(self.name): + self._dbg(2, "tarfile: Skipped %r" % name) + return + + # Special case: The user wants to add the current + # working directory. + if name == ".": + if recursive: + if arcname == ".": + arcname = "" + for f in os.listdir("."): + self.add(f, os.path.join(arcname, f)) + return + + self._dbg(1, name) + + # Create a TarInfo object from the file. + tarinfo = self.gettarinfo(name, arcname) + + if tarinfo is None: + self._dbg(1, "tarfile: Unsupported type %r" % name) + return + + # Append the tar header and data to the archive. + if tarinfo.isreg(): + f = file(name, "rb") + self.addfile(tarinfo, f) + f.close() + + if tarinfo.type in (LNKTYPE, SYMTYPE, FIFOTYPE, CHRTYPE, BLKTYPE): + tarinfo.size = 0L + self.addfile(tarinfo) + + if tarinfo.isdir(): + self.addfile(tarinfo) + if recursive: + for f in os.listdir(name): + self.add(os.path.join(name, f), os.path.join(arcname, f)) + + def addfile(self, tarinfo, fileobj=None): + """Add the TarInfo object `tarinfo' to the archive. If `fileobj' is + given, tarinfo.size bytes are read from it and added to the archive. + You can create TarInfo objects using gettarinfo(). + On Windows platforms, `fileobj' should always be opened with mode + 'rb' to avoid irritation about the file size. + """ + self._check("aw") + + tarinfo.name = normpath(tarinfo.name) + if tarinfo.isdir(): + # directories should end with '/' + tarinfo.name += "/" + + if tarinfo.linkname: + tarinfo.linkname = normpath(tarinfo.linkname) + + if tarinfo.size > MAXSIZE_MEMBER: + raise ValueError, "file is too large (>8GB)" + + if len(tarinfo.linkname) > LENGTH_LINK: + if self.posix: + raise ValueError, "linkname is too long (>%d)" \ + % (LENGTH_LINK) + else: + self._create_gnulong(tarinfo.linkname, GNUTYPE_LONGLINK) + tarinfo.linkname = tarinfo.linkname[:LENGTH_LINK -1] + self._dbg(2, "tarfile: Created GNU tar extension LONGLINK") + + if len(tarinfo.name) > LENGTH_NAME: + if self.posix: + prefix = tarinfo.name[:LENGTH_PREFIX + 1] + while prefix and prefix[-1] != "/": + prefix = prefix[:-1] + + name = tarinfo.name[len(prefix):] + prefix = prefix[:-1] + + if not prefix or len(name) > LENGTH_NAME: + raise ValueError, "name is too long (>%d)" \ + % (LENGTH_NAME) + + tarinfo.name = name + tarinfo.prefix = prefix + else: + self._create_gnulong(tarinfo.name, GNUTYPE_LONGNAME) + tarinfo.name = tarinfo.name[:LENGTH_NAME - 1] + self._dbg(2, "tarfile: Created GNU tar extension LONGNAME") + + self.fileobj.write(tarinfo.tobuf()) + self.offset += BLOCKSIZE + + # If there's data to follow, append it. + if fileobj is not None: + copyfileobj(fileobj, self.fileobj, tarinfo.size) + blocks, remainder = divmod(tarinfo.size, BLOCKSIZE) + if remainder > 0: + self.fileobj.write(NUL * (BLOCKSIZE - remainder)) + blocks += 1 + self.offset += blocks * BLOCKSIZE + + self.members.append(tarinfo) + self.membernames.append(tarinfo.name) + self.chunks.append(self.offset) + + def extract(self, member, path=""): + """Extract a member from the archive to the current working directory, + using its full name. Its file information is extracted as accurately + as possible. `member' may be a filename or a TarInfo object. You can + specify a different directory using `path'. + """ + self._check("r") + + if isinstance(member, TarInfo): + tarinfo = member + else: + tarinfo = self.getmember(member) + + try: + self._extract_member(tarinfo, os.path.join(path, tarinfo.name)) + except EnvironmentError, e: + if self.errorlevel > 0: + raise + else: + if e.filename is None: + self._dbg(1, "tarfile: %s" % e.strerror) + else: + self._dbg(1, "tarfile: %s %r" % (e.strerror, e.filename)) + except ExtractError, e: + if self.errorlevel > 1: + raise + else: + self._dbg(1, "tarfile: %s" % e) + + def extractfile(self, member): + """Extract a member from the archive as a file object. `member' may be + a filename or a TarInfo object. If `member' is a regular file, a + file-like object is returned. If `member' is a link, a file-like + object is constructed from the link's target. If `member' is none of + the above, None is returned. + The file-like object is read-only and provides the following + methods: read(), readline(), readlines(), seek() and tell() + """ + self._check("r") + + if isinstance(member, TarInfo): + tarinfo = member + else: + tarinfo = self.getmember(member) + + if tarinfo.isreg(): + return self.fileobject(self, tarinfo) + + elif tarinfo.type not in SUPPORTED_TYPES: + # If a member's type is unknown, it is treated as a + # regular file. + return self.fileobject(self, tarinfo) + + elif tarinfo.islnk() or tarinfo.issym(): + if isinstance(self.fileobj, _Stream): + # A small but ugly workaround for the case that someone tries + # to extract a (sym)link as a file-object from a non-seekable + # stream of tar blocks. + raise StreamError, "cannot extract (sym)link as file object" + else: + # A (sym)link's file object is it's target's file object. + return self.extractfile(self._getmember(tarinfo.linkname, + tarinfo)) + else: + # If there's no data associated with the member (directory, chrdev, + # blkdev, etc.), return None instead of a file object. + return None + + def _extract_member(self, tarinfo, targetpath): + """Extract the TarInfo object tarinfo to a physical + file called targetpath. + """ + # Fetch the TarInfo object for the given name + # and build the destination pathname, replacing + # forward slashes to platform specific separators. + if targetpath[-1:] == "/": + targetpath = targetpath[:-1] + targetpath = os.path.normpath(targetpath) + + # Create all upper directories. + upperdirs = os.path.dirname(targetpath) + if upperdirs and not os.path.exists(upperdirs): + ti = TarInfo() + ti.name = upperdirs + ti.type = DIRTYPE + ti.mode = 0777 + ti.mtime = tarinfo.mtime + ti.uid = tarinfo.uid + ti.gid = tarinfo.gid + ti.uname = tarinfo.uname + ti.gname = tarinfo.gname + try: + self._extract_member(ti, ti.name) + except: + pass + + if tarinfo.islnk() or tarinfo.issym(): + self._dbg(1, "%s -> %s" % (tarinfo.name, tarinfo.linkname)) + else: + self._dbg(1, tarinfo.name) + + if tarinfo.isreg(): + self.makefile(tarinfo, targetpath) + elif tarinfo.isdir(): + self.makedir(tarinfo, targetpath) + elif tarinfo.isfifo(): + self.makefifo(tarinfo, targetpath) + elif tarinfo.ischr() or tarinfo.isblk(): + self.makedev(tarinfo, targetpath) + elif tarinfo.islnk() or tarinfo.issym(): + self.makelink(tarinfo, targetpath) + elif tarinfo.type not in SUPPORTED_TYPES: + self.makeunknown(tarinfo, targetpath) + else: + self.makefile(tarinfo, targetpath) + + self.chown(tarinfo, targetpath) + if not tarinfo.issym(): + self.chmod(tarinfo, targetpath) + self.utime(tarinfo, targetpath) + + #-------------------------------------------------------------------------- + # Below are the different file methods. They are called via + # _extract_member() when extract() is called. They can be replaced in a + # subclass to implement other functionality. + + def makedir(self, tarinfo, targetpath): + """Make a directory called targetpath. + """ + try: + os.mkdir(targetpath) + except EnvironmentError, e: + if e.errno != errno.EEXIST: + raise + + def makefile(self, tarinfo, targetpath): + """Make a file called targetpath. + """ + source = self.extractfile(tarinfo) + target = file(targetpath, "wb") + copyfileobj(source, target) + source.close() + target.close() + + def makeunknown(self, tarinfo, targetpath): + """Make a file from a TarInfo object with an unknown type + at targetpath. + """ + self.makefile(tarinfo, targetpath) + self._dbg(1, "tarfile: Unknown file type %r, " \ + "extracted as regular file." % tarinfo.type) + + def makefifo(self, tarinfo, targetpath): + """Make a fifo called targetpath. + """ + if hasattr(os, "mkfifo"): + os.mkfifo(targetpath) + else: + raise ExtractError, "fifo not supported by system" + + def makedev(self, tarinfo, targetpath): + """Make a character or block device called targetpath. + """ + if not hasattr(os, "mknod") or not hasattr(os, "makedev"): + raise ExtractError, "special devices not supported by system" + + mode = tarinfo.mode + if tarinfo.isblk(): + mode |= stat.S_IFBLK + else: + mode |= stat.S_IFCHR + + os.mknod(targetpath, mode, + os.makedev(tarinfo.devmajor, tarinfo.devminor)) + + def makelink(self, tarinfo, targetpath): + """Make a (symbolic) link called targetpath. If it cannot be created + (platform limitation), we try to make a copy of the referenced file + instead of a link. + """ + linkpath = tarinfo.linkname + try: + if tarinfo.issym(): + os.symlink(linkpath, targetpath) + else: + os.link(linkpath, targetpath) + except AttributeError: + if tarinfo.issym(): + linkpath = os.path.join(os.path.dirname(tarinfo.name), + linkpath) + linkpath = normpath(linkpath) + + try: + self._extract_member(self.getmember(linkpath), targetpath) + except (EnvironmentError, KeyError), e: + linkpath = os.path.normpath(linkpath) + try: + shutil.copy2(linkpath, targetpath) + except EnvironmentError, e: + raise IOError, "link could not be created" + + def chown(self, tarinfo, targetpath): + """Set owner of targetpath according to tarinfo. + """ + if pwd and hasattr(os, "geteuid") and os.geteuid() == 0: + # We have to be root to do so. + try: + g = grp.getgrnam(tarinfo.gname)[2] + except KeyError: + try: + g = grp.getgrgid(tarinfo.gid)[2] + except KeyError: + g = os.getgid() + try: + u = pwd.getpwnam(tarinfo.uname)[2] + except KeyError: + try: + u = pwd.getpwuid(tarinfo.uid)[2] + except KeyError: + u = os.getuid() + try: + if tarinfo.issym() and hasattr(os, "lchown"): + os.lchown(targetpath, u, g) + else: + os.chown(targetpath, u, g) + except EnvironmentError, e: + raise ExtractError, "could not change owner" + + def chmod(self, tarinfo, targetpath): + """Set file permissions of targetpath according to tarinfo. + """ + try: + os.chmod(targetpath, tarinfo.mode) + except EnvironmentError, e: + raise ExtractError, "could not change mode" + + def utime(self, tarinfo, targetpath): + """Set modification time of targetpath according to tarinfo. + """ + if sys.platform == "win32" and tarinfo.isdir(): + # According to msdn.microsoft.com, it is an error (EACCES) + # to use utime() on directories. + return + try: + os.utime(targetpath, (tarinfo.mtime, tarinfo.mtime)) + except EnvironmentError, e: + raise ExtractError, "could not change modification time" + + #-------------------------------------------------------------------------- + + def next(self): + """Return the next member of the archive as a TarInfo object, when + TarFile is opened for reading. Return None if there is no more + available. + """ + self._check("ra") + if self.firstmember is not None: + m = self.firstmember + self.firstmember = None + return m + + # Read the next block. + self.fileobj.seek(self.chunks[-1]) + while True: + buf = self.fileobj.read(BLOCKSIZE) + if not buf: + return None + try: + tarinfo = TarInfo.frombuf(buf) + except ValueError: + if self.ignore_zeros: + if buf.count(NUL) == BLOCKSIZE: + adj = "empty" + else: + adj = "invalid" + self._dbg(2, "0x%X: %s block" % (self.offset, adj)) + self.offset += BLOCKSIZE + continue + else: + # Block is empty or unreadable. + if self.chunks[-1] == 0: + # If the first block is invalid. That does not + # look like a tar archive we can handle. + raise ReadError,"empty, unreadable or compressed file" + return None + break + + # We shouldn't rely on this checksum, because some tar programs + # calculate it differently and it is merely validating the + # header block. We could just as well skip this part, which would + # have a slight effect on performance... + if tarinfo.chksum != calc_chksum(buf): + self._dbg(1, "tarfile: Bad Checksum %r" % tarinfo.name) + + # Set the TarInfo object's offset to the current position of the + # TarFile and set self.offset to the position where the data blocks + # should begin. + tarinfo.offset = self.offset + self.offset += BLOCKSIZE + + # Check if the TarInfo object has a typeflag for which a callback + # method is registered in the TYPE_METH. If so, then call it. + if tarinfo.type in self.TYPE_METH: + tarinfo = self.TYPE_METH[tarinfo.type](self, tarinfo) + else: + tarinfo.offset_data = self.offset + if tarinfo.isreg() or tarinfo.type not in SUPPORTED_TYPES: + # Skip the following data blocks. + self.offset += self._block(tarinfo.size) + + if tarinfo.isreg() and tarinfo.name[:-1] == "/": + # some old tar programs don't know DIRTYPE + tarinfo.type = DIRTYPE + + self.members.append(tarinfo) + self.membernames.append(tarinfo.name) + self.chunks.append(self.offset) + return tarinfo + + #-------------------------------------------------------------------------- + # Below are some methods which are called for special typeflags in the + # next() method, e.g. for unwrapping GNU longname/longlink blocks. They + # are registered in TYPE_METH below. You can register your own methods + # with this mapping. + # A registered method is called with a TarInfo object as only argument. + # + # During its execution the method MUST perform the following tasks: + # 1. set tarinfo.offset_data to the position where the data blocks begin, + # if there is data to follow. + # 2. set self.offset to the position where the next member's header will + # begin. + # 3. return a valid TarInfo object. + + def proc_gnulong(self, tarinfo): + """Evaluate the blocks that hold a GNU longname + or longlink member. + """ + buf = "" + name = None + linkname = None + count = tarinfo.size + while count > 0: + block = self.fileobj.read(BLOCKSIZE) + buf += block + self.offset += BLOCKSIZE + count -= BLOCKSIZE + + if tarinfo.type == GNUTYPE_LONGNAME: + name = nts(buf) + if tarinfo.type == GNUTYPE_LONGLINK: + linkname = nts(buf) + + buf = self.fileobj.read(BLOCKSIZE) + + tarinfo = TarInfo.frombuf(buf) + tarinfo.offset = self.offset + self.offset += BLOCKSIZE + tarinfo.offset_data = self.offset + tarinfo.name = name or tarinfo.name + tarinfo.linkname = linkname or tarinfo.linkname + + if tarinfo.isreg() or tarinfo.type not in SUPPORTED_TYPES: + # Skip the following data blocks. + self.offset += self._block(tarinfo.size) + return tarinfo + + def proc_sparse(self, tarinfo): + """Analyze a GNU sparse header plus extra headers. + """ + buf = tarinfo.tobuf() + sp = _ringbuffer() + pos = 386 + lastpos = 0L + realpos = 0L + # There are 4 possible sparse structs in the + # first header. + for i in xrange(4): + try: + offset = int(buf[pos:pos + 12], 8) + numbytes = int(buf[pos + 12:pos + 24], 8) + except ValueError: + break + if offset > lastpos: + sp.append(_hole(lastpos, offset - lastpos)) + sp.append(_data(offset, numbytes, realpos)) + realpos += numbytes + lastpos = offset + numbytes + pos += 24 + + isextended = ord(buf[482]) + origsize = int(buf[483:495], 8) + + # If the isextended flag is given, + # there are extra headers to process. + while isextended == 1: + buf = self.fileobj.read(BLOCKSIZE) + self.offset += BLOCKSIZE + pos = 0 + for i in xrange(21): + try: + offset = int(buf[pos:pos + 12], 8) + numbytes = int(buf[pos + 12:pos + 24], 8) + except ValueError: + break + if offset > lastpos: + sp.append(_hole(lastpos, offset - lastpos)) + sp.append(_data(offset, numbytes, realpos)) + realpos += numbytes + lastpos = offset + numbytes + pos += 24 + isextended = ord(buf[504]) + + if lastpos < origsize: + sp.append(_hole(lastpos, origsize - lastpos)) + + tarinfo.sparse = sp + + tarinfo.offset_data = self.offset + self.offset += self._block(tarinfo.size) + tarinfo.size = origsize + return tarinfo + + # The type mapping for the next() method. The keys are single character + # strings, the typeflag. The values are methods which are called when + # next() encounters such a typeflag. + TYPE_METH = { + GNUTYPE_LONGNAME: proc_gnulong, + GNUTYPE_LONGLINK: proc_gnulong, + GNUTYPE_SPARSE: proc_sparse + } + + #-------------------------------------------------------------------------- + # Little helper methods: + + def _block(self, count): + """Round up a byte count by BLOCKSIZE and return it, + e.g. _block(834) => 1024. + """ + blocks, remainder = divmod(count, BLOCKSIZE) + if remainder: + blocks += 1 + return blocks * BLOCKSIZE + + def _getmember(self, name, tarinfo=None): + """Find an archive member by name from bottom to top. + If tarinfo is given, it is used as the starting point. + """ + if tarinfo is None: + end = len(self.members) + else: + end = self.members.index(tarinfo) + + for i in xrange(end - 1, -1, -1): + if name == self.membernames[i]: + return self.members[i] + + def _load(self): + """Read through the entire archive file and look for readable + members. + """ + while True: + tarinfo = self.next() + if tarinfo is None: + break + self._loaded = True + + def _check(self, mode=None): + """Check if TarFile is still open, and if the operation's mode + corresponds to TarFile's mode. + """ + if self.closed: + raise IOError, "%s is closed" % self.__class__.__name__ + if mode is not None and self._mode not in mode: + raise IOError, "bad operation for mode %r" % self._mode + + def __iter__(self): + """Provide an iterator object. + """ + if self._loaded: + return iter(self.members) + else: + return TarIter(self) + + def _create_gnulong(self, name, type): + """Write a GNU longname/longlink member to the TarFile. + It consists of an extended tar header, with the length + of the longname as size, followed by data blocks, + which contain the longname as a null terminated string. + """ + tarinfo = TarInfo() + tarinfo.name = "././@LongLink" + tarinfo.type = type + tarinfo.mode = 0 + tarinfo.size = len(name) + + # write extended header + self.fileobj.write(tarinfo.tobuf()) + # write name blocks + self.fileobj.write(name) + blocks, remainder = divmod(tarinfo.size, BLOCKSIZE) + if remainder > 0: + self.fileobj.write(NUL * (BLOCKSIZE - remainder)) + blocks += 1 + self.offset += blocks * BLOCKSIZE + + def _dbg(self, level, msg): + """Write debugging output to sys.stderr. + """ + if level <= self.debug: + print >> sys.stderr, msg +# class TarFile + +class TarIter: + """Iterator Class. + + for tarinfo in TarFile(...): + suite... + """ + + def __init__(self, tarfile): + """Construct a TarIter object. + """ + self.tarfile = tarfile + def __iter__(self): + """Return iterator object. + """ + return self + def next(self): + """Return the next item using TarFile's next() method. + When all members have been read, set TarFile as _loaded. + """ + tarinfo = self.tarfile.next() + if not tarinfo: + self.tarfile._loaded = True + raise StopIteration + return tarinfo + +# Helper classes for sparse file support +class _section: + """Base class for _data and _hole. + """ + def __init__(self, offset, size): + self.offset = offset + self.size = size + def __contains__(self, offset): + return self.offset <= offset < self.offset + self.size + +class _data(_section): + """Represent a data section in a sparse file. + """ + def __init__(self, offset, size, realpos): + _section.__init__(self, offset, size) + self.realpos = realpos + +class _hole(_section): + """Represent a hole section in a sparse file. + """ + pass + +class _ringbuffer(list): + """Ringbuffer class which increases performance + over a regular list. + """ + def __init__(self): + self.idx = 0 + def find(self, offset): + idx = self.idx + while True: + item = self[idx] + if offset in item: + break + idx += 1 + if idx == len(self): + idx = 0 + if idx == self.idx: + # End of File + return None + self.idx = idx + return item + +#--------------------------------------------- +# zipfile compatible TarFile class +#--------------------------------------------- +TAR_PLAIN = 0 # zipfile.ZIP_STORED +TAR_GZIPPED = 8 # zipfile.ZIP_DEFLATED +class TarFileCompat: + """TarFile class compatible with standard module zipfile's + ZipFile class. + """ + def __init__(self, file, mode="r", compression=TAR_PLAIN): + if compression == TAR_PLAIN: + self.tarfile = TarFile.taropen(file, mode) + elif compression == TAR_GZIPPED: + self.tarfile = TarFile.gzopen(file, mode) + else: + raise ValueError, "unknown compression constant" + if mode[0:1] == "r": + members = self.tarfile.getmembers() + for i in xrange(len(members)): + m = members[i] + m.filename = m.name + m.file_size = m.size + m.date_time = time.gmtime(m.mtime)[:6] + def namelist(self): + return map(lambda m: m.name, self.infolist()) + def infolist(self): + return filter(lambda m: m.type in REGULAR_TYPES, + self.tarfile.getmembers()) + def printdir(self): + self.tarfile.list() + def testzip(self): + return + def getinfo(self, name): + return self.tarfile.getmember(name) + def read(self, name): + return self.tarfile.extractfile(self.tarfile.getmember(name)).read() + def write(self, filename, arcname=None, compress_type=None): + self.tarfile.add(filename, arcname) + def writestr(self, zinfo, bytes): + import StringIO + import calendar + zinfo.name = zinfo.filename + zinfo.size = zinfo.file_size + zinfo.mtime = calendar.timegm(zinfo.date_time) + self.tarfile.addfile(zinfo, StringIO.StringIO(bytes)) + def close(self): + self.tarfile.close() +#class TarFileCompat + +#-------------------- +# exported functions +#-------------------- +def is_tarfile(name): + """Return True if name points to a tar archive that we + are able to handle, else return False. + """ + try: + t = open(name) + t.close() + return True + except TarError: + return False + +open = TarFile.open |