Rob Nelson added the comment:
The code referenced in the previous comment only hits for tarfiles built from
Streams.
The same (incorrect) code exists in the gzip.py library as well, and hits the
more common usecase of building a tar.gz from a set of files on disk.
def _write_gzip_header(self, compresslevel):
self.fileobj.write(b'\037\213') # magic header
self.fileobj.write(b'\010') # compression method
try:
# RFC 1952 requires the FNAME field to be Latin-1. Do not
# include filenames that cannot be represented that way.
fname = os.path.basename(self.name)
if not isinstance(fname, bytes):
fname = fname.encode('latin-1')
if fname.endswith(b'.gz'):
fname = fname[:-3]
This effects decompressing the file with 7zip, who respects the FNAME value,
and thus attempts to create a new file with the same name as the file its
currently decompressing. Or if you extract to another directory, it creates a
tar file that is named "foo.tgz", which is confusing to users who are expecting
a tar.
You can very easily reproduce this:
import tarfile
f = tarfile.open("test.tgz", mode="w:gz")
f.close()
and then "extract" the file with 7zip
--
nosy: +veaviticus
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