It appears this has been addressed earlier on this list, but it does not address a permanent solution for OSX. It appears as though there is a built-in easy_install for OSX in /usr/bin/easy_install, that places rosinstall in the native OSX python installation, which is not what we want because ros may have some python2.5 dependencies. 

Is there a way not to use easy_install? Or use the Macports version of easy_install? Possibly download the older shell script directly instead?

My current work around is to call the Macport's version of easy_install directly and then execute the rosinstall script directly.
-chris

On Sep 3, 2010, at 1:38 PM, Chris Mansley wrote:

> All,
>  I am trying to install ROS under OSX, but I am having some problems with the python version. I followed the instructions from the installation for OSX and I now have python 2.5 as the default, but when I try to use easy_install to get rosinstall, it seems to place rosinstall in the 2.6 directories and when I run rosinstall it searches for yaml in the 2.6 directories. Here is my output:
> 
> cmansley-macbook:~ cmansley$ which python
> /opt/local/bin/python
> cmansley-macbook:~ cmansley$ python --version
> Python 2.5.5
> cmansley-macbook:~ cmansley$ sudo easy_install -U rosinstall
> Password:
> Searching for rosinstall
> Reading http://pypi.python.org/simple/rosinstall/
> Reading http://www.ros.org/wiki/rosinstall
> Best match: rosinstall 0.5.6
> Downloading http://pypi.python.org/packages/source/r/rosinstall/rosinstall-0.5.6.tar.gz#md5=00556d75f290b1ef67bd22fd720de4ee
> Processing rosinstall-0.5.6.tar.gz
> Running rosinstall-0.5.6/setup.py -q bdist_egg --dist-dir /tmp/easy_install-0gR4EY/rosinstall-0.5.6/egg-dist-tmp-N1xgJv
> zip_safe flag not set; analyzing archive contents...
> Adding rosinstall 0.5.6 to easy-install.pth file
> Installing rosinstall script to /usr/local/bin
> 
> Installed /Library/Python/2.6/site-packages/rosinstall-0.5.6-py2.6.egg
> Processing dependencies for rosinstall
> Finished processing dependencies for rosinstall
> cmansley-macbook:~ cmansley$ rosinstall ~/ros http://ros.org/rosinstalls/cturtle_base.rosinstall
> Traceback (most recent call last):
>  File "/usr/local/bin/rosinstall", line 5, in <module>
>    pkg_resources.run_script('rosinstall==0.5.6', 'rosinstall')
>  File "/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/pkg_resources.py", line 442, in run_script
>    self.require(requires)[0].run_script(script_name, ns)
>  File "/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/pkg_resources.py", line 1167, in run_script
>    exec script_code in namespace, namespace
>  File "/Library/Python/2.6/site-packages/rosinstall-0.5.6-py2.6.egg/EGG-INFO/scripts/rosinstall", line 23, in <module>
> 
> ImportError: No module named yaml
> cmansley-macbook:~ cmansley$ sudo port install py25-yaml
> --->  Computing dependencies for py25-yaml
> --->  Cleaning py25-yaml
> cmansley-macbook:~ cmansley$ rosinstall ~/ros http://ros.org/rosinstalls/cturtle_base.rosinstall
> Traceback (most recent call last):
>  File "/usr/local/bin/rosinstall", line 5, in <module>
>    pkg_resources.run_script('rosinstall==0.5.6', 'rosinstall')
>  File "/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/pkg_resources.py", line 442, in run_script
>    self.require(requires)[0].run_script(script_name, ns)
>  File "/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/pkg_resources.py", line 1167, in run_script
>    exec script_code in namespace, namespace
>  File "/Library/Python/2.6/site-packages/rosinstall-0.5.6-py2.6.egg/EGG-INFO/scripts/rosinstall", line 23, in <module>
> 
> ImportError: No module named yaml
> cmansley-macbook:~ cmansley$ 
>