[Distutils] virtual-python.py, sys.prefix, and Mac
ronaldoussoren at mac.com
Sun Sep 16 21:49:23 CEST 2007
On 16 Sep, 2007, at 21:44, Ian Bicking wrote:
> Ronald Oussoren wrote:
>> On 15 Sep, 2007, at 18:09, Ian Bicking wrote:
>>> Hi all. I'm kind of giving up on workingenv, and have started
>>> from virtual-python as a basis instead
>>> So the basic technique here is to copy the executable into
>>> /ENV/bin/python, and then sys.prefix will be '/ENV'. The standard
>>> Python installed on a Mac doesn't seem to do this -- the prefix
>>> regardless. (Custom built Python's on Mac work like normal.)
>> All framework builds behave as you describe, Modules/getpath.c
>> special-cases calculation of sys.prefix for framework builds of
>> Python (the prefix is inside the framework regardless of where the
>> executable is).
> Is there any way to effect that calculation? I.e., in a normal
> build that calculation is based on the location of the executable,
> so virtualenv moves the executable to effect that.
Move the framework.
>>> Does anyone know a way to get the normal effect on this Mac Python?
>> You could copy the framework into the virtual python environment
>> and rewrite linker commands in the python command-line executable
>> to use that version of the framework.
> That sounds like the similar situation to the standard library on
> other posix systems, which I've avoided copying. To do that, I put
> a text file in that points to the original stdlib location, and in
> site.py I add that in (I only copy the portions of the stdlib that
> are needed when site.py is loaded -- os, re, etc). So the same
> thing should be possible with the framework, and that's not too much
> of a problem.
> I don't have any idea how to figure out the linker commands to
> change the Python command-line executable...? I don't even have the
> vocabulary to begin figuring that out, I'm afraid. Can you give an
macholib (which is on PyPI) can do that. I'm not aware of a command-
line tool that can do the same thing.
> Ian Bicking : ianb at colorstudy.com : http://blog.ianbicking.org
> : Write code, do good : http://topp.openplans.org/careers
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