[mod_python] mod_python: How-to Resolve Python Version conflicts

Eeswar Kameswara Rao eeswar at pbsystems.com
Sat Apr 18 04:06:33 EDT 2009


Currently how things look on my system
--------------------------------------------------
SRC/MAKEFILE

CC=gcc
AR=ar
APXS=/usr/sbin/apxs
MKDEP=@MKDEP@

# requires flex 2.5.31 for reentrant support
LEX=/usr/bin/flex
INCLUDES=-I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5
LIBS=-lm  -framework  Python    -ldl
LDFLAGS= -Wl,-framework,Python  -u _PyMac_Error -framework Python   -Wl,-F/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5 -arch i386
OPT=
CFLAGS=$(OPT) $(INCLUDES) -arch i386
CPPFLAGS = -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5 -DNDEBUG -DMACOSX -DENABLE_DTRACE
srcdir=.

SRCS=   mod_python.c _apachemodule.c requestobject.c tableobject.c util.c \
                serverobject.c connobject.c filterobject.c hlist.c \
                hlistobject.c finfoobject.c

all:    dso

psp_parser.c: psp_parser.l
        @rm -f psp_parser.c
        $(LEX) -R -opsp_parser.c --header-file=include/psp_flex.h psp_parser.l

dso:    mod_python.so
        @echo dso > .install

mod_python.so: $(SRCS)
        @echo
        @echo 'Compiling for DSO.'
        @echo
        $(APXS) $(INCLUDES) -c -Wc,"-arch i386" $(SRCS) $(LDFLAGS) $(LIBS)
        @rm -f mod_python.so
        @ln -s .libs/mod_python.so mod_python.so
clean:
        rm -rf $(OBJS) core libpython.a mod_python.so *~ .libs *.o *.slo *.lo *.la

distclean: clean
        rm -f Makefile .depend .install

# this is a hack to help avoid a gcc/solaris problem
# python uses assert() which needs _eprintf(). See
# SOLARIS_HACKS above
_eprintf.o:
        ar -x `gcc -print-libgcc-file-name` _eprintf.o
_floatdidf.o:
        ar -x `gcc -print-libgcc-file-name` _floatdidf.o
_muldi3.o:
        ar -x `gcc -print-libgcc-file-name` _muldi3.o

# DO NOT DELETE THIS LINE


Symlink 'Current' status
--------------------------------------------
#####Initally

0 drwxr-xr-x   9 root  wheel  306 Oct 14  2008 2.3
0 drwxr-xr-x  11 root  wheel  374 Mar 13 15:06 2.5
8 lrwxrwxrwx   1 root  wheel    3 Oct 14  2008 Current -> 2.3

##MeanWhile to Configure mod_python
drwxr-xr-x   9 root  wheel  306 Oct 14  2008 2.3
drwxrwxrwx  11 root  wheel  374 Mar 13 15:06 2.5
lrwxr-xr-x   1 root  wheel    3 Apr 18 11:36 Current -> 2.5
lrwxrwxrwx   1 root  wheel    3 Oct 14  2008 Current_bak_18_APR -> 2.3

##After creating mod_python Reset back to 2.3. So, Finally
0 drwxr-xr-x   9 root  wheel  306 Oct 14  2008 2.3
0 drwxr-xr-x  11 root  wheel  374 Mar 13 15:06 2.5
8 lrwxrwxrwx   1 root  wheel    3 Oct 14  2008 Current -> 2.3
8 lrwxr-xr-x   1 root  wheel    3 Apr 18 11:36 Current2.5 -> 2.5


Regards,
Eeswar


________________________________________
From: Eeswar Kameswara Rao
Sent: Saturday, April 18, 2009 1:35 PM
To: Graham Dumpleton
Cc: mod_python at modpython.org
Subject: RE: [mod_python] mod_python: How-to Resolve Python Version conflicts

Thank you Graham for the immediate  response.

Sorry I could not reply immediately.
I have actually figured the solution and fell asleep (work in a different time zone).

I missed to mention the following facts: -
1. I have two different users for each of the Python versions
2. One user runs on Python 2.5.1 and another user on Python 2.3.5
3. I run Mac OSX 10.5.6 with latest updates
4. For each of the users the default python PATHS are setup so that each gets his/her own version of python at command prompt


Changes I made to make Python 2.5 and 2.3 co-exist without interfering with each other
------------------------------------------------------------------------------------------------------------
1. I modified the symlink /System/Library/Frameworks/Python/Versions/Current  point to 2.5
2. Then redid the following
./configure --with-ptyhon=/usr/bin/python2.5
Modified the paths in Makefile to point to Python2.5
Added '-arch i386' options wherever required in the Makefile
make && sudo make install
www:src Tool$ otool -L mod_python.so
> mod_python.so:
>        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.3)
>        /System/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.1)
>        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
> www:src Tool$ file mod_python.so
> mod_python.so: Mach-O bundle i386

I have reset the symlink Current to 2.3.

Note
-------
1. Looks like the symlink '/System/Library/Frameworks/Python/Versions/Current ' plays a very important role up to creating the mod_python.so.
2. Now I am able to run the python web-apps from any login irrespective of which python version access is provided to

INFERENCES (please validate these)
---------------------------------------------------------
1. Web-based python does not include command-prompt based python
2. All python web-apps refer only to mod_python
3. Command prompt Python refers to the PATH variable in the Shell's ENV variables whereas mod_python refers to its own internal path settings for python version (which probably got create during the 'Configure and Make')
3. Mod-python uses the python settings provided during the "./configure --with-python=" and the settings provided in the python paths of Makefile
4. Specifying Architecture is an important component for creating a workable mod_python


Regards,
Eeswar
________________________________________
From: Graham Dumpleton [graham.dumpleton at gmail.com]
Sent: Saturday, April 18, 2009 3:45 AM
To: Eeswar Kameswara Rao
Cc: mod_python at modpython.org
Subject: Re: [mod_python] mod_python: How-to Resolve Python Version conflicts

You may well have screwed up your operating system Python
installation. You should never install separate Python versions under
/System/Library as that is reserved for operating system supplied
packages. You should also never change /usr/bin/python to put at some
other version because if operating system functions are dependent on
the version that was there previously, you will cause those bits of
the operating system to fail.

Since your operating system is now in such an unknown state of
functioning, there isn't probably much point trying to pursue why you
have problems.

Next time install the alternate Python under /Library or better still
/usr/local and don't stuff with /usr/bin/python. Then as per
instructions for mod_python, use the --with-python option to configure
script to say which version of Python you want to use rather than
trying to hand edit things as you likely aren't changing everything
that would need to be different when different Python version used.

Graham

2009/4/18 Eeswar Kameswara Rao <eeswar at pbsystems.com>:
> Hello All,
>
> I am new to this list. I am having trouble to access the archives.
>
> Here is my problem. PLEASE HELP.
>
> ISSUE
> ---------
> 1. After I do "make && sudo make install" I get a mod_python.so in the src and .libs directories
> 2. When I do a 'otool -L ./mod_python.so'  it reports
> www:src Tool$ otool -L mod_python.so
> mod_python.so:
>        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.3)
>        /System/Library/Frameworks/Python.framework/Versions/2.3/Python (compatibility version 2.3.0, current version 2.3.5)
>        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
>
> SCENARIO
> ---------------
> 1. H/W - Intel Core2Duo MacBook laptop
> 2. I have two versions of Python i.e. 2.3 and 2.5.1
> 3. Python 2.3 path is /System/Library/Frameworks/Python.framework/Versions/2.3/
> 4. Python2.3 executable is in /usr/local/sbin
> 5. Python2.5 path is /System/Library/Frameworks/Python.framework/Versions/2.5/
> 6. Python2.5 Executable is in /usr/bin
> 7. Apache version 2.0 is enabled in 32-bit mode (reconfigured the apache plist for 32-bit)
> 8. Ran .sudo ./configure --with-python=/usr/bin/python2.5
> 9. Added to Makefile with library path pointing to Python2.5 in LDFLAGS
> 10. Added to Makefile '-arch i386' to LDFLAGS, CFLAGS and under mod_python.so
> 11. After doing a "make && sudo make install" I get a mod_python.so built with Python2.3 framework (????)
>
> I want this mod_python to be Python2.5 compliant ONLY.
>
> So all my Python web apps crash. Error_logs report version conflicts.
>
> Below is the listing from "make && sudo make install'
>
> www:mod_python-3.3.1 Tool$ make && sudo make install
>
> Compiling for DSO.
>
> /usr/sbin/apxs -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5 -c -Wc,"-arch i386" mod_python.c _apachemodule.c requestobject.c tableobject.c util.c serverobject.c connobject.c filterobject.c hlist.c hlistobject.c finfoobject.c -Wl,-framework,Python  -u _PyMac_Error -framework Python   -Wl,-F/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5 -arch i386   -lm  -framework  Python    -ldl
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o mod_python.lo mod_python.c && touch mod_python.slo
> mod_python.c: In function 'python_init':
> mod_python.c:826: warning: initialization from incompatible pointer type
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o _apachemodule.lo _apachemodule.c && touch _apachemodule.slo
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o requestobject.lo requestobject.c && touch requestobject.slo
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o tableobject.lo tableobject.c && touch tableobject.slo
> tableobject.c:329: warning: initialization from incompatible pointer type
> tableobject.c:1092: warning: initialization from incompatible pointer type
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o util.lo util.c && touch util.slo
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o serverobject.lo serverobject.c && touch serverobject.slo
> serverobject.c:387: warning: initialization from incompatible pointer type
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o connobject.lo connobject.c && touch connobject.slo
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o filterobject.lo filterobject.c && touch filterobject.slo
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o hlist.lo hlist.c && touch hlist.slo
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o hlistobject.lo hlistobject.c && touch hlistobject.slo
> /usr/share/apr-1/build-1/libtool --silent --mode=compile gcc    -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp  -I/usr/include/apache2  -I/usr/include/apr-1   -I/usr/include/apr-1  -arch i386 -I/Users/Tool/mod_python-3.3.1/src/include -I/usr/include/apache2 -I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5  -c -o finfoobject.lo finfoobject.c && touch finfoobject.slo
> finfoobject.c:278: warning: 'intargfunc' is deprecated
> finfoobject.c:278: warning: initialization from incompatible pointer type
> /usr/share/apr-1/build-1/libtool --silent --mode=link gcc -o mod_python.la  -rpath /usr/libexec/apache2 -module -avoid-version    finfoobject.lo hlistobject.lo hlist.lo filterobject.lo connobject.lo serverobject.lo util.lo tableobject.lo requestobject.lo _apachemodule.lo mod_python.lo -Wl,-framework,Python -u _PyMac_Error -framework Python -Wl,-F/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5 -arch i386 -lm -framework Python -ldl
> make[2]: `psp_parser.c' is up to date.
> /usr/bin/python2.5 setup.py build
> running build
> running build_py
> running build_ext
>
> Now su and make install
>  (or, if you only want to perform a partial install,
>   you can use make install_dso and make install_py_lib)
>
> Password:
> make[3]: `psp_parser.c' is up to date.
> /usr/bin/python2.5 setup.py build
> running build
> running build_py
> running build_ext
>
> Now su and make install
>  (or, if you only want to perform a partial install,
>   you can use make install_dso and make install_py_lib)
>
>
> Performing DSO installation.
>
> /usr/bin/install -c -d /usr/libexec/apache2
> /usr/bin/install -c src/mod_python.so /usr/libexec/apache2
>
> Now don't forget to edit your main config and add
>    LoadModule python_module /usr/libexec/apache2/mod_python.so
> and if your configuration uses ClearModuleList, then also
>    AddModule mod_python.c
>
> cd dist && make install_py_lib
> make[3]: `psp_parser.c' is up to date.
> if test -z "" ; then \
>                /usr/bin/python2.5 setup.py install --optimize 2 --force ; \
>        else \
>                /usr/bin/python2.5 setup.py install --optimize 2 --force --root  ; \
>        fi
> running install
> running build
> running build_py
> running build_ext
> running install_lib
> copying build/lib.macosx-10.5-i386-2.5/mod_python/__init__.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/_psp.so -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/apache.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/cache.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/cgihandler.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/Cookie.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/importer.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/psp.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/publisher.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/python22.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/Session.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/testhandler.py -> /Library/Python/2.5/site-packages/mod_python
> copying build/lib.macosx-10.5-i386-2.5/mod_python/util.py -> /Library/Python/2.5/site-packages/mod_python
> byte-compiling /Library/Python/2.5/site-packages/mod_python/__init__.py to __init__.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/apache.py to apache.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/cache.py to cache.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/cgihandler.py to cgihandler.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/Cookie.py to Cookie.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/importer.py to importer.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/psp.py to psp.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/publisher.py to publisher.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/python22.py to python22.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/Session.py to Session.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/testhandler.py to testhandler.pyc
> byte-compiling /Library/Python/2.5/site-packages/mod_python/util.py to util.pyc
> writing byte-compilation script '/tmp/tmpG6QrK-.py'
> /System/Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python -OO /tmp/tmpG6QrK-.py
> removing /tmp/tmpG6QrK-.py
> running install_egg_info
> Removing /Library/Python/2.5/site-packages/mod_python-3.3.1-py2.5.egg-info
> Writing /Library/Python/2.5/site-packages/mod_python-3.3.1-py2.5.egg-info
> www:mod_python-3.3.1 Tool$ cd src
> www:src Tool$ ls
> Makefile                connobject.lo           hlist.lo                mod_python.slo          serverobject.o
> Makefile.in             connobject.o            hlist.o                 mod_python.so           serverobject.slo
> Makefile.txt            connobject.slo          hlist.slo               mod_python.vcproj       tableobject.c
> Makefile_bak            filterobject.c          hlistobject.c           psp_parser.c            tableobject.lo
> Makefile_bak_16MAR      filterobject.lo         hlistobject.lo          psp_parser.l            tableobject.o
> Version.rc              filterobject.o          hlistobject.o           psp_string.c            tableobject.slo
> _apachemodule.c         filterobject.slo        hlistobject.slo         requestobject.c         util.c
> _apachemodule.lo        finfoobject.c           include                 requestobject.lo        util.lo
> _apachemodule.o         finfoobject.lo          mod_python.c            requestobject.o         util.o
> _apachemodule.slo       finfoobject.o           mod_python.la           requestobject.slo       util.slo
> _pspmodule.c            finfoobject.slo         mod_python.lo           serverobject.c
> connobject.c            hlist.c                 mod_python.o            serverobject.lo
> www:src Tool$ otool -L mod_python.so
> mod_python.so:
>        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.3)
>        /System/Library/Frameworks/Python.framework/Versions/2.3/Python (compatibility version 2.3.0, current version 2.3.5)
>        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
> www:src Tool$ file mod_python.so
> mod_python.so: Mach-O bundle i386
>
>
> PLEASE HELP.
>
> Thanks and Regards,
> Eeswar
>
>
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