[Pyobjc-dev] py2app alias builds broken on Snow Leopard

[James R E. <Jam...@lr...>]

Hi folks,

I haven't seen anything relating to this on the list, but it appears  
that the version of py2app that ships with Snow Leopard makes broken  
alias builds.  The problems appears to be with the way it symlinks to  
the python interpreter.  On 10.6, it links to /usr/bin/python, whereas  
in 10.5 it would symlink to the /System Python.framework version (see  
below).  The result is that when __boot__.py builds the sys.path, it's  
sys.exec_prefix is /usr, so the proper site-packages (including  
PyObjC!) don't get included.  See transcript below for more info.

I've attached two patches (one for SVN trunk; one for the py2app that  
ships with Snow Leopard) that work for me.  They modify the py2app  
build_alias_executable() method to symlink to sys.prefix/bin/python  
(if it exists) instead of sys.executable.  This works for me, and I  
think it should normally be the correct behavior, but I'm not 100%  
convinced of that.  Ronald: do you agree?

See the transcript below for an illustration of the problem.

Cheers!
James


### Differences in built applications between 10.6 (above) and 10.5  
(below)

lri11-245:~/Projects/LRI/Scotty/Viewer/dist/Scotty.app/Contents/MacOS  
$ ll
total 216
-rwxr-xr-x  1 eaganj  eaganj  103292 Jul  1 08:26:26 2009 Scotty*
lrwx------  1 eaganj  eaganj      15 Nov  2 10:34:05 2009 python@ -> / 
usr/bin/python

lri11-245:~/Projects/LRI/ScottySVNSucks/Viewer/dist/Scotty.app/ 
Contents/MacOS $ ll
total 176
-rwxr-xr-x  1 eaganj  eaganj  83840 Sep 24 06:50:46 2007 Scotty*
lrwx------  1 eaganj  eaganj     99 Jul 27 15:00:42 2009 python@ -> / 
System/Library/Frameworks/Python.framework/Versions/2.5/Resources/ 
Python.app/Contents/MacOS/Python



### Differences in running python via symlink:

# First with python found on PATH
lri11-245:~ $ which python
/usr/bin/python
lri11-245:~ $ python
Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> import sys; sys.executable
'/usr/bin/python'
 >>> sys.prefix
'/System/Library/Frameworks/Python.framework/Versions/2.6'


# Now with Python via symlink
lri11-245:~ $ ln -s /usr/bin/python symlink-python
lri11-245:~ $ ./symlink-python
Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> import sys; sys.executable
'/Users/eaganj/symlink-python'
 >>> sys.prefix
'/usr'
 >>> # The prefixes are different depending on how the same python  
exec is invoked!

# Note that /usr/bin/python is not a symlink
lri11-245:~ $ ll /usr/bin/python*
-rwxr-xr-x  2 root  wheel  86000 Jul  8 08:57:10 2009 /usr/bin/python*
-rwxr-xr-x  5 root  wheel    925 Jul  8 08:57:08 2009 /usr/bin/python- 
config*
lrwxr-xr-x  1 root  wheel     75 Aug 29 14:00:38 2009 /usr/bin/ 
python2.5@ -> ../../System/Library/Frameworks/Python.framework/ 
Versions/2.5/bin/python2.5
lrwxr-xr-x  1 root  wheel     82 Aug 29 14:00:38 2009 /usr/bin/ 
python2.5-config@ -> ../../System/Library/Frameworks/Python.framework/ 
Versions/2.5/bin/python2.5-config
lrwxr-xr-x  1 root  wheel     75 Aug 29 14:00:38 2009 /usr/bin/ 
python2.6@ -> ../../System/Library/Frameworks/Python.framework/ 
Versions/2.6/bin/python2.6
lrwxr-xr-x  1 root  wheel     82 Aug 29 14:00:38 2009 /usr/bin/ 
python2.6-config@ -> ../../System/Library/Frameworks/Python.framework/ 
Versions/2.6/bin/python2.6-config
-rwxr-xr-x  2 root  wheel  86000 Jul  8 08:57:10 2009 /usr/bin/pythonw*
lrwxr-xr-x  1 root  wheel     76 Aug 29 14:00:38 2009 /usr/bin/ 
pythonw2.5@ -> ../../System/Library/Frameworks/Python.framework/ 
Versions/2.5/bin/pythonw2.5
lrwxr-xr-x  1 root  wheel     76 Aug 29 14:00:38 2009 /usr/bin/ 
pythonw2.6@ -> ../../System/Library/Frameworks/Python.framework/ 
Versions/2.6/bin/pythonw2.6

# And that /usr/bin/python is apparently some kind of a wrapper  
program (sizes are different)
lri11-245:~ $ ll /System/Library/Frameworks/Python.framework/Versions/ 
2.6/bin/python2.6
-rwxr-xr-x  1 root  wheel  50720 Jul  8 08:56:58 2009 /System/Library/ 
Frameworks/Python.framework/Versions/2.6/bin/python2.6*


Patch for SVN trunk (made from py2app/trunk):