• avonlady

    Hi,

    I saw somewhat similar discussion here, but not exactly the same.

    On my jailbroken iPhone, I had setup a complete build environment incl. clang, iOS SDK, Python Dev files, etc. One of the nice things this allows me to do is to compile Python modules that rely on C code. As an example I chose greenlet, which was listed as one of the blacklisted modules in StaSH, exactly because of the C dependency.

    When I run it in a Python installation outside of Pythonista, all works well:

    iPhone-5s:/private/var/mobile/Containers/Shared/AppGroup/appid/Pythonista3/Documents root# uname -a
    Darwin iPhone-5s 18.7.0 Darwin Kernel Version 18.7.0: Mon Aug 19 22:24:08 PDT 2019; root:xnu-4903.272.1~1/RELEASE_ARM64_S5L8960X iPhone6,2 arm64 N53AP Darwin
    iPhone-5s:/private/var/mobile/Containers/Shared/AppGroup/appid/Pythonista3/Documents root# file ./site-packages-3/greenlet.so
    ./site-packages-3/greenlet.so: Mach-O 64-bit arm64 bundle, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL>
    iPhone-5s:/private/var/mobile/Containers/Shared/AppGroup/appid/Pythonista3/Documents root# python3
    Python 3.7.3 (default, May  8 2019, 14:19:08) 
    [Clang 10.0.1 (clang-1001.0.46.4)] on darwin
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import greenlet
    >>> dir(greenlet)
    ['GREENLET_USE_CONTEXT_VARS', 'GREENLET_USE_GC', 'GREENLET_USE_TRACING', 'GreenletExit', '_C_API', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', '__version__', 'error', 'getcurrent', 'gettrace', 'greenlet', 'settrace']
    >>> dir(greenlet.greenlet)
    ['GreenletExit', '__bool__', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '_stack_saved', 'dead', 'error', 'getcurrent', 'gettrace', 'gr_frame', 'parent', 'run', 'settrace', 'switch', 'throw']
    

    However, I am not able to call the same module from within Pythonista. I have the greenlet.so file in my site-packages-3 folder, alongside my other non-C modules that work just fine, but when I call import greenlet, all I get is ModuleNotFoundError: No module named 'greenlet' error.

    Since I am doing this experiment on a jailbroken iPhone, I don't think code signing is at fault here, but I even tried signing the .so with my Developer Certificate, which did not help.

    So, my question: Is Pythonista hardcoded to ignore any .so modules and to look for .pyc and .py only? Do you have any other idea I could try to force Pythonista to load an arm64-compiled C module?

    posted in Pythonista read more

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