Replace unzip usage with Python's zipfile

[FFY00]

Would it be possible to replace the unzip usage with Python's zipfile? I see no reason to have an external dependency such as this.

auditwheel/auditwheel/tools.py

Line 43 in 8fc14ac

subprocess.check_output(['unzip', '-o', '-d', out_dir, zip_fname])

[lkollar]

According to the comment above, unzip is used to work around an issue where permissions are not correctly preserved. If we can ensure the behaviour is preserved, we can replace it with ZipFile, but it won't be a trivial change probably.

Alternatively, once pypa/wheel#357 is landed and wheel will have a public API, we might be able to use that and drop the code dealing with ZIP files.

[FFY00]

Sure, although you can still access the permissions in zipfile.ZipInfo IIRC. You can use infolist to set the permissions after the extraction, should be a pretty straight forward patch.

The reason I am asking this is because unzip is a custom external program. It is not part of any operating system. Some Linux distributions might include it by default, but definitely not all, it might also be missing.