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Well, rosdep init puts a file in /etc/ros/rosdep/, if this is "outside of the ROS environment" for you. rosdep update fetches the new rosdep definition files and stores them somewhere too.

Other than that, rosdep does nothing as long as you don't do a rosdep install <PKG>. This will then install the required dependencies that are specified in the package. This can be other releases ROS packaged or third party packages as debian pkgs or from any other package manager, e.g. pip.

Well, rosdep init puts a file in /etc/ros/rosdep/, if this is "outside of the ROS environment" for you. rosdep update fetches the new rosdep definition files and stores them somewhere too.

Other than that, rosdep does nothing as long as you don't do a rosdep install <PKG>. This will then install the required dependencies that are specified in the package. This can be other releases released ROS packaged or third party packages as debian pkgs or from any other package manager, e.g. pip.

Well, rosdep init puts a file in /etc/ros/rosdep/, if this is "outside of the ROS environment" for you. rosdep update fetches the new rosdep definition files and stores them somewhere too.

Other than that, rosdep does nothing as long as you don't do a rosdep install <PKG>. This will then install the required dependencies that are specified in the package. This can be other released ROS packaged packages or third party packages as debian pkgs or from any other package manager, e.g. pip.