rosws init fails when /opt/ros is a symbolic link

[moesenle]

In our case, /opt/ros is a symbolic link pointing to /work/ros on a different partition. Calling rosws init fails with the following error:

lohr@atbeetz15:~/rosws$ /usr/bin/rosws init . /opt/ros/fuerte/
Using ROS_ROOT: /work/ros/fuerte/
Writing /usr/wiss/lohr/rosws/.rosinstall
(Over-)Writing setup.sh, setup.bash, and setup.zsh in /usr/wiss/lohr/rosws
ERROR in rosinstall: Multiple ros stacks found in config set(['/opt/ros/fuerte/share/ros', '/work/ros/fuerte/share/ros']), Please elimate all but one.
They come from the following sources: {'/opt/ros/fuerte/setup.sh': '/opt/ros/fuerte/share/ros', '/work/ros/fuerte/share/ros': '/work/ros/fuerte/share/ros'}

My guess is that the expansion of links is inconsistent, i.e. sometimes the absoulte path and sometimes the path including the link is used.