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How does overlay works

Hi, I recently came across a post that mentioned that we should never try to edit stuff in ros/fuerte/stacks, the correct way should be through overlay instead. This means I have been doing stuff the wrong way all along. I have been making changes to launch files in erratic_robot, which is located in stack.

I would like to know how does overlay works, the wiki page states that"The overlay now includes all packages that were installed in /opt/ros/fuerte." But it is not the case for me, my overlay (fuerte workspace) only contain a sandbox, turtlebot which i installed and some setup files.

In addition, when I installed a package (eg.erratic_robot), where should it be located? For me, the erratic_robot appears in ros/fuerte/stacks.

I appreciate your help, thank you.

How does overlay worksdo overlays work?

Hi, I recently came across a post that mentioned that we should never try to edit stuff in ros/fuerte/stacks, the correct way should be through overlay instead. This means I have been doing stuff the wrong way all along. I have been making changes to launch files in erratic_robot, which is located in stack.

I would like to know how does overlay works, the wiki page states that"The overlay now includes all packages that were installed in /opt/ros/fuerte." But it is not the case for me, my overlay (fuerte workspace) only contain a sandbox, turtlebot which i installed and some setup files.

In addition, when I installed a package (eg.erratic_robot), where should it be located? For me, the erratic_robot appears in ros/fuerte/stacks.

I appreciate your help, thank you.