mirror of
https://github.com/openSUSE/osc.git
synced 2024-11-10 14:56:14 +01:00
1933da5bcc
Using os.getcwd() in combination with a subsequent .encode() is error
prone:
marcus@linux:~> mkdir illegal_utf-8_encoding_$'\xff'_dir
marcus@linux:~> cd illegal_utf-8_encoding_$'\xff'_dir/
marcus@linux:~/illegal_utf-8_encoding_ÿ_dir> python3
Python 3.8.6 (default, Nov 09 2020, 12:09:06) [GCC] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.getcwd().encode()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'utf-8' codec can't encode character '\udcff' in position 36: surrogates not allowed
>>>
Hence, use os.getcwdb(), which returns a bytes, instead of
os.getcwd().encode().
Fixes: commit 36f7b8ffe9 ("Fix a
potential TypeError in CpioRead.copyin and CpioRead.copyin_file")
258 lines
8.1 KiB
Python
258 lines
8.1 KiB
Python
# Copyright 2009 Marcus Huewe <suse-tux@gmx.de>
|
|
#
|
|
# This program is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU General Public License version 2
|
|
# as published by the Free Software Foundation;
|
|
#
|
|
# 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 Street, Fifth Floor, Boston, MA 02110-1301, USA
|
|
|
|
from __future__ import print_function
|
|
|
|
import mmap
|
|
import os
|
|
import stat
|
|
import struct
|
|
import sys
|
|
|
|
# workaround for python24
|
|
if not hasattr(os, 'SEEK_SET'):
|
|
os.SEEK_SET = 0
|
|
|
|
# format implementation is based on src/copyin.c and src/util.c (see cpio sources)
|
|
|
|
class CpioError(Exception):
|
|
"""base class for all cpio related errors"""
|
|
def __init__(self, fn, msg):
|
|
Exception.__init__(self)
|
|
self.file = fn
|
|
self.msg = msg
|
|
def __str__(self):
|
|
return '%s: %s' % (self.file, self.msg)
|
|
|
|
class CpioHdr:
|
|
"""
|
|
Represents a cpio header ("New" portable format and CRC format).
|
|
"""
|
|
def __init__(self, mgc, ino, mode, uid, gid, nlink, mtime, filesize,
|
|
dev_maj, dev_min, rdev_maj, rdev_min, namesize, checksum,
|
|
off=-1, filename=b''):
|
|
"""
|
|
All passed parameters are hexadecimal strings (not NUL terminated) except
|
|
off and filename. They will be converted into normal ints.
|
|
"""
|
|
self.ino = ino
|
|
self.mode = mode
|
|
self.uid = uid
|
|
self.gid = gid
|
|
self.nlink = nlink
|
|
self.mtime = mtime
|
|
# 0 indicates FIFO or dir
|
|
self.filesize = filesize
|
|
self.dev_maj = dev_maj
|
|
self.dev_min = dev_min
|
|
# only needed for special block/char files
|
|
self.rdev_maj = rdev_maj
|
|
self.rdev_min = rdev_min
|
|
# length of filename (inluding terminating NUL)
|
|
self.namesize = namesize
|
|
# != 0 indicates CRC format (which we do not support atm)
|
|
self.checksum = checksum
|
|
for k, v in self.__dict__.items():
|
|
self.__dict__[k] = int(v, 16)
|
|
self.filename = filename
|
|
# data starts at dataoff and ends at dataoff+filesize
|
|
self.dataoff = off
|
|
|
|
def __str__(self):
|
|
return "%s %s %s %s" % (self.filename, self.filesize, self.namesize, self.dataoff)
|
|
|
|
class CpioRead:
|
|
"""
|
|
Represents a cpio archive.
|
|
Supported formats:
|
|
* ascii SVR4 no CRC also called "new_ascii"
|
|
"""
|
|
|
|
# supported formats - use name -> mgc mapping to increase readabilty
|
|
sfmt = {
|
|
'newascii': b'070701',
|
|
}
|
|
|
|
# header format
|
|
hdr_fmt = '6s8s8s8s8s8s8s8s8s8s8s8s8s8s'
|
|
hdr_len = 110
|
|
|
|
def __init__(self, filename):
|
|
self.filename = filename
|
|
self.format = -1
|
|
self.__file = None
|
|
self._init_datastructs()
|
|
|
|
def __del__(self):
|
|
if self.__file:
|
|
self.__file.close()
|
|
|
|
def __iter__(self):
|
|
for h in self.hdrs:
|
|
yield h
|
|
|
|
def _init_datastructs(self):
|
|
self.hdrs = []
|
|
|
|
def _calc_padding(self, off):
|
|
"""
|
|
skip some bytes after a header or a file.
|
|
based on 'static void tape_skip_padding()' in copyin.c.
|
|
"""
|
|
if self._is_format('newascii'):
|
|
return (4 - (off % 4)) % 4
|
|
|
|
def _is_format(self, type):
|
|
return self.format == self.sfmt[type]
|
|
|
|
def _copyin_file(self, hdr, dest, fn):
|
|
"""saves file to disk"""
|
|
# TODO: investigate links (e.g. symbolic links are working)
|
|
# check if we have a regular file
|
|
if not stat.S_ISREG(stat.S_IFMT(hdr.mode)):
|
|
msg = '\'%s\' is no regular file - only regular files are supported atm' % hdr.filename
|
|
raise NotImplementedError(msg)
|
|
self.__file.seek(hdr.dataoff, os.SEEK_SET)
|
|
fn = os.path.join(dest, fn)
|
|
with open(fn, 'wb') as f:
|
|
f.write(self.__file.read(hdr.filesize))
|
|
os.chmod(fn, hdr.mode)
|
|
uid = hdr.uid
|
|
if uid != os.geteuid() or os.geteuid() != 1:
|
|
uid = -1
|
|
gid = hdr.gid
|
|
if not gid in os.getgroups() or os.getegid() != -1:
|
|
gid = -1
|
|
os.chown(fn, uid, gid)
|
|
|
|
def _get_hdr(self, fn):
|
|
for h in self.hdrs:
|
|
if h.filename == fn:
|
|
return h
|
|
return None
|
|
|
|
def read(self):
|
|
if not self.__file:
|
|
self.__file = open(self.filename, 'rb')
|
|
else:
|
|
self.__file.seek(0, os.SEEK_SET)
|
|
self._init_datastructs()
|
|
data = self.__file.read(6)
|
|
self.format = data
|
|
if not self.format in self.sfmt.values():
|
|
raise CpioError(self.filename, '\'%s\' is not a supported cpio format' % self.format)
|
|
pos = 0
|
|
while (len(data) != 0):
|
|
self.__file.seek(pos, os.SEEK_SET)
|
|
data = self.__file.read(self.hdr_len)
|
|
if not data:
|
|
break
|
|
pos += self.hdr_len
|
|
data = struct.unpack(self.hdr_fmt, data)
|
|
hdr = CpioHdr(*data)
|
|
hdr.filename = self.__file.read(hdr.namesize - 1)
|
|
if hdr.filename == b'TRAILER!!!':
|
|
break
|
|
pos += hdr.namesize
|
|
if self._is_format('newascii'):
|
|
pos += self._calc_padding(hdr.namesize + 110)
|
|
hdr.dataoff = pos
|
|
self.hdrs.append(hdr)
|
|
pos += hdr.filesize + self._calc_padding(hdr.filesize)
|
|
|
|
def copyin_file(self, filename, dest = None, new_fn = None):
|
|
"""
|
|
copies filename to dest.
|
|
If dest is None the file will be stored in $PWD/filename. If dest points
|
|
to a dir the file will be stored in dest/filename. In case new_fn is specified
|
|
the file will be stored as new_fn.
|
|
"""
|
|
hdr = self._get_hdr(filename)
|
|
if not hdr:
|
|
raise CpioError(filename, '\'%s\' does not exist in archive' % filename)
|
|
dest = dest or os.getcwdb()
|
|
fn = new_fn or filename
|
|
self._copyin_file(hdr, dest, fn)
|
|
|
|
def copyin(self, dest = None):
|
|
"""
|
|
extracts the cpio archive to dest.
|
|
If dest is None $PWD will be used.
|
|
"""
|
|
dest = dest or os.getcwdb()
|
|
for h in self.hdrs:
|
|
self._copyin_file(h, dest, h.filename)
|
|
|
|
class CpioWrite:
|
|
"""cpio archive small files in memory, using new style portable header format"""
|
|
|
|
def __init__(self):
|
|
self.cpio = bytearray()
|
|
|
|
def add(self, name=None, content=None, perms=0x1a4, type=0x8000):
|
|
namesize = len(name) + 1
|
|
if namesize % 2:
|
|
name += b'\0'
|
|
filesize = len(content)
|
|
mode = perms | type
|
|
|
|
c = bytearray()
|
|
c.extend(b'070701') # magic
|
|
c.extend(b'%08X' % 0) # inode
|
|
c.extend(b'%08X' % mode) # mode
|
|
c.extend(b'%08X' % 0) # uid
|
|
c.extend(b'%08X' % 0) # gid
|
|
c.extend(b'%08X' % 0) # nlink
|
|
c.extend(b'%08X' % 0) # mtime
|
|
c.extend(b'%08X' % filesize)
|
|
c.extend(b'%08X' % 0) # major
|
|
c.extend(b'%08X' % 0) # minor
|
|
c.extend(b'%08X' % 0) # rmajor
|
|
c.extend(b'%08X' % 0) # rminor
|
|
c.extend(b'%08X' % namesize)
|
|
c.extend(b'%08X' % 0) # checksum
|
|
|
|
c.extend(name + b'\0')
|
|
c.extend(b'\0' * (len(c) % 4))
|
|
|
|
c.extend(content)
|
|
|
|
if len(c) % 4:
|
|
c.extend(b'\0' * (4 - len(c) % 4))
|
|
|
|
self.cpio.extend(c)
|
|
|
|
def add_padding(self):
|
|
if len(self.cpio) % 512:
|
|
self.cpio.extend(b'\0' * (512 - len(self.cpio) % 512))
|
|
|
|
def get(self):
|
|
self.add(b'TRAILER!!!', b'')
|
|
self.add_padding()
|
|
return bytes(self.cpio)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
if len(sys.argv) != 2:
|
|
print('usage: %s /path/to/file.cpio' % sys.argv[0])
|
|
sys.exit(1)
|
|
# a potential user might want to pass a bytes instead of a str
|
|
# to make sure that the CpioError's file attribute is always a
|
|
# bytes
|
|
cpio = CpioRead(sys.argv[1])
|
|
cpio.read()
|
|
for hdr in cpio:
|
|
print(hdr)
|