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92919a66d2
The previous implementation used execv(2) to run the real interpreter, which means that you cannot use the arch(1) tool to select the architecture you want to use for a universal build because that only affects the python/pythonw wrapper and not the actual interpreter. The new version uses posix_spawnv with a number of OSX-specific options that ensure that the real interpreter is started using the same CPU architecture as the wrapper, and that means that 'arch -ppc python' now actually works. I've also changed the way that the wrapper looks for the framework: it is now linked to the framework rather than hardcoding the framework path. This should make it easier to provide pythonw support in tools like virtualenv.
75 lines
2.8 KiB
Python
75 lines
2.8 KiB
Python
"""
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Bootstrap script for IDLE as an application bundle.
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"""
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import sys, os
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# Change the current directory the user's home directory, that way we'll get
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# a more useful default location in the open/save dialogs.
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os.chdir(os.path.expanduser('~/Documents'))
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# Make sure sys.executable points to the python interpreter inside the
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# framework, instead of at the helper executable inside the application
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# bundle (the latter works, but doesn't allow access to the window server)
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#
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# .../IDLE.app/
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# Contents/
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# MacOS/
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# IDLE (a python script)
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# Python{-32} (symlink)
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# Resources/
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# idlemain.py (this module)
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# ...
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#
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# ../IDLE.app/Contents/MacOS/Python{-32} is symlinked to
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# ..Library/Frameworks/Python.framework/Versions/m.n
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# /Resources/Python.app/Contents/MacOS/Python{-32}
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# which is the Python interpreter executable
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#
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# The flow of control is as follows:
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# 1. IDLE.app is launched which starts python running the IDLE script
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# 2. IDLE script exports
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# PYTHONEXECUTABLE = .../IDLE.app/Contents/MacOS/Python{-32}
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# (the symlink to the framework python)
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# 3. IDLE script alters sys.argv and uses os.execve to replace itself with
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# idlemain.py running under the symlinked python.
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# This is the magic step.
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# 4. During interpreter initialization, because PYTHONEXECUTABLE is defined,
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# sys.executable may get set to an unuseful value.
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#
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# (Note that the IDLE script and the setting of PYTHONEXECUTABLE is
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# generated automatically by bundlebuilder in the Python 2.x build.
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# Also, IDLE invoked via command line, i.e. bin/idle, bypasses all of
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# this.)
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#
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# Now fix up the execution environment before importing idlelib.
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# Reset sys.executable to its normal value, the actual path of
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# the interpreter in the framework, by following the symlink
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# exported in PYTHONEXECUTABLE.
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pyex = os.environ['PYTHONEXECUTABLE']
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sys.executable = os.path.join(sys.prefix, 'bin', 'python%d.%d'%(sys.version_info[:2]))
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# Remove any sys.path entries for the Resources dir in the IDLE.app bundle.
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p = pyex.partition('.app')
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if p[2].startswith('/Contents/MacOS/Python'):
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sys.path = [value for value in sys.path if
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value.partition('.app') != (p[0], p[1], '/Contents/Resources')]
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# Unexport PYTHONEXECUTABLE so that the other Python processes started
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# by IDLE have a normal sys.executable.
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del os.environ['PYTHONEXECUTABLE']
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# Look for the -psn argument that the launcher adds and remove it, it will
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# only confuse the IDLE startup code.
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for idx, value in enumerate(sys.argv):
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if value.startswith('-psn_'):
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del sys.argv[idx]
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break
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# Now it is safe to import idlelib.
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from idlelib import macosxSupport
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macosxSupport._appbundle = True
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from idlelib.PyShell import main
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if __name__ == '__main__':
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main()
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