On Thu, Mar 28, 2013 at 9:09 AM, Brett Cannon <br...@python.org> wrote:
> > > > On Thu, Mar 28, 2013 at 10:44 AM, Thomas Heller <thel...@ctypes.org>wrote: > >> Am 27.03.2013 20:38, schrieb Vinay Sajip: >> >> This quote is here to stop GMane complaining that I'm top-posting. >>>> Ignore. >>>> >>> >>> I've already posted this to distutils-sig, but thought that it might be >>> of >>> interest to readers here as it relates to importing C extensions ... >>> >>> zipimport is great, but there can be issues importing software that >>> contains >>> C extensions. But the new wheel format (PEP 427) may give us a better >>> way of >>> importing zip files containing C extensions. Since wheels are .zip >>> files, they >>> can sometimes be used to provide functionality without needing to be >>> installed. >>> But whereas .zip files contain no convention for indicating >>> compatibility with >>> a particular Python, wheels do contain this compatibility information. >>> Thus, it >>> is possible to check if a wheel can be directly imported from, and the >>> wheel >>> support in distlib allows you to take advantage of this using the >>> mount() and >>> unmount() methods. When you mount a wheel, its absolute path name is >>> added to >>> sys.path, allowing the Python code in it to be imported. (A >>> DistlibException is >>> raised if the wheel isn't compatible with the Python which calls the >>> mount() >>> method.) >>> >> >> The zip-file itself could support importing compiled extensions when it >> contains a python-wrapper module that unpacks the .so/.dll file somewhere, >> and finally calls imp.load_dynamic() to import it and replace itself. > > > Which must be done carefully to prevent a security issue. It shouldn't be > unzipped anywhere but into a directory only writable by the process. > > Once http://sourceware.org/bugzilla/show_bug.cgi?id=11767 is implemented and available in libc, no extraction of .so's should be needed (they will likely need to be stored uncompressed in the .zip file for that though).
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