using catkin for workspace dependency introspection.

gistfile1.sh

WORKSPACE=`pwd`
distro_url=https://raw.github.com/willowgarage/rosdistro/master/fuerte.yaml
curl -s $distro_url > distro.yaml

deburls=$(python -c "import yaml; print '\n'.join([x['url'] for x in yaml.load(open('distro.yaml'))])")
cd $WORKSPACE

for x in $deburls
do
    dirname=$(basename ${x%.git})
    if [ -e $dirname/.git ]
    then
	(cd $dirname && git checkout master && git pull)
    else
	git clone $x $dirname
    fi
done

cd $WORKSPACE
. /home/erublee/catkin_wet/build/setup.sh
erublee@dri$ catkin-topological-order 
catkin
rospkg
rospack
ros
genmsg
roscpp_core
gencpp
genpy
langs
std_msgs
common_msgs
actionlib
ros_comm
swig-wx
rx
erublee@dri$ catkin-topological-order --top langs --action upstream
genpy
genmsg
catkin
gencpp
erublee@dri$ catkin-topological-order --top langs --action downstream
std_msgs
common_msgs