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#
# Copyright (C) 2008 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import bz2
import stat
import tarfile
import zlib
import StringIO
from import_ext import ImportExternal
from error import ImportError
class ImportTar(ImportExternal):
"""Streams a (optionally compressed) tar file from the network
directly into a Project's Git repository.
"""
@classmethod
def CanAccept(cls, url):
"""Can this importer read and unpack the data stored at url?
"""
if url.endswith('.tar.gz') or url.endswith('.tgz'):
return True
if url.endswith('.tar.bz2'):
return True
if url.endswith('.tar'):
return True
return False
def _UnpackFiles(self):
url_fd, url = self._OpenUrl()
try:
if url.endswith('.tar.gz') or url.endswith('.tgz'):
tar_fd = _Gzip(url_fd)
elif url.endswith('.tar.bz2'):
tar_fd = _Bzip2(url_fd)
elif url.endswith('.tar'):
tar_fd = _Raw(url_fd)
else:
raise ImportError('non-tar file extension: %s' % url)
try:
tar = tarfile.TarFile(name = url,
mode = 'r',
fileobj = tar_fd)
try:
for entry in tar:
mode = entry.mode
if (mode & 0170000) == 0:
if entry.isdir():
mode |= stat.S_IFDIR
elif entry.isfile() or entry.islnk(): # hard links as files
mode |= stat.S_IFREG
elif entry.issym():
mode |= stat.S_IFLNK
if stat.S_ISLNK(mode): # symlink
data_fd = StringIO.StringIO(entry.linkname)
data_sz = len(entry.linkname)
elif stat.S_ISDIR(mode): # directory
data_fd = StringIO.StringIO('')
data_sz = 0
else:
data_fd = tar.extractfile(entry)
data_sz = entry.size
self._UnpackOneFile(mode, data_sz, entry.name, data_fd)
finally:
tar.close()
finally:
tar_fd.close()
finally:
url_fd.close()
class _DecompressStream(object):
"""file like object to decompress a tar stream
"""
def __init__(self, fd):
self._fd = fd
self._pos = 0
self._buf = None
def tell(self):
return self._pos
def seek(self, offset):
d = offset - self._pos
if d > 0:
self.read(d)
elif d == 0:
pass
else:
raise NotImplementedError, 'seek backwards'
def close(self):
self._fd = None
def read(self, size = -1):
if not self._fd:
raise EOFError, 'Reached EOF'
r = []
try:
if size >= 0:
self._ReadChunk(r, size)
else:
while True:
self._ReadChunk(r, 2048)
except EOFError:
pass
if len(r) == 1:
r = r[0]
else:
r = ''.join(r)
self._pos += len(r)
return r
def _ReadChunk(self, r, size):
b = self._buf
try:
while size > 0:
if b is None or len(b) == 0:
b = self._Decompress(self._fd.read(2048))
continue
use = min(size, len(b))
r.append(b[:use])
b = b[use:]
size -= use
finally:
self._buf = b
def _Decompress(self, b):
raise NotImplementedError, '_Decompress'
class _Raw(_DecompressStream):
"""file like object for an uncompressed stream
"""
def __init__(self, fd):
_DecompressStream.__init__(self, fd)
def _Decompress(self, b):
return b
class _Bzip2(_DecompressStream):
"""file like object to decompress a .bz2 stream
"""
def __init__(self, fd):
_DecompressStream.__init__(self, fd)
self._bz = bz2.BZ2Decompressor()
def _Decompress(self, b):
return self._bz.decompress(b)
_FHCRC, _FEXTRA, _FNAME, _FCOMMENT = 2, 4, 8, 16
class _Gzip(_DecompressStream):
"""file like object to decompress a .gz stream
"""
def __init__(self, fd):
_DecompressStream.__init__(self, fd)
self._z = zlib.decompressobj(-zlib.MAX_WBITS)
magic = fd.read(2)
if magic != '\037\213':
raise IOError, 'Not a gzipped file'
method = ord(fd.read(1))
if method != 8:
raise IOError, 'Unknown compression method'
flag = ord(fd.read(1))
fd.read(6)
if flag & _FEXTRA:
xlen = ord(fd.read(1))
xlen += 256 * ord(fd.read(1))
fd.read(xlen)
if flag & _FNAME:
while fd.read(1) != '\0':
pass
if flag & _FCOMMENT:
while fd.read(1) != '\0':
pass
if flag & _FHCRC:
fd.read(2)
def _Decompress(self, b):
return self._z.decompress(b)
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