tarfile

I want to append a file to the tar file. For example, the files in test.tar.gz are a.png, b.png, c.png . I have a new png file named a.png , I want to append to a.png to test.tar.gz and cover the old file a.png in test.tar.gz . My code: import tarfile a = tarfile.open('test.tar.gz', 'w:gz') a.add('a.png') a.close() then, all the files in test.tar.gz disappeard but a.png , if I change my code to this: import tarfile a = tarfile.open('test.tar.gz', 'a:')# or a:gz a.add('a.png') a.close() the program is crashed, error log: Traceback (most recent call last): File "<stdin>", line 1, in <module>

I'm trying to process the contents of a tarfile using multiprocessing.Pool . I'm able to successfully use the ThreadPool implementation within the multiprocessing module, but would like to be able to use processes instead of threads as it would possibly be faster and eliminate some changes made for Matplotlib to handle the multithreaded environment. I'm getting an error that I suspect is related to processes not sharing address space, but I'm not sure how to fix it: Traceback (most recent call last): File "test_tarfile.py", line 32, in <module> test_multiproc() File "test_tarfile.py", line 24,

I would like to read some files from a tarball and save it to a new tarball. This is the code I wrote. archive = 'dum/2164/archive.tar' # Read input data. input_tar = tarfile.open(archive, 'r|') tarinfo = input_tar.next() input_tar.close() # Write output file. output_tar = tarfile.open('foo.tar', 'w|') output_tar.addfile(tarinfo) output_tar.close() Unfortunately, the output tarball is no good: $ tar tf foo.tar ./1QZP_A--2JED_A--not_reformatted.dat.bz2 tar: Truncated input file (needed 1548288 bytes, only 1545728 available) tar: Error exit delayed from previous errors. Any clue how to read and

I have a file, which I can decompress under linux using the following command: unxz < file.xz > file.txt How can I do the same using python? If I use python3 and the tarfile module and do the following: import sys import tarfile try: with tarfile.open('temp.xz', 'r:xz') as t: t.extract() except Exception as e: print("Error:", e.strerror) I get the exception: ReadError('invalid header',) . So apparently it expects some file- or directory information which is not present in the xz file. So how can I decompress a file without header information? The tarfile module is only for... err... tar files.

I'm trying to extract user-submitted zip and tar files to a directory. The documentation for zipfile's extractall method (similarly with tarfile's extractall ) states that it's possible for paths to be absolute or contain .. paths that go outside the destination path. Instead, I could use extract myself, like this: some_path = '/destination/path' some_zip = '/some/file.zip' zipf = zipfile.ZipFile(some_zip, mode='r') for subfile in zipf.namelist(): zipf.extract(subfile, some_path) Is this safe? Is it possible for a file in the archive to wind up outside of some_path in this case? If so, what