Is it possible to have rosdep set-up a ubuntu ppa on your system as part of dependency validation?

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This is currently not possible, but it's a feature we hope to add (or would help implementing)

What is the status of this wish? As maintainer of ROS packages, this would be very helpful!

As an alternative, I am considering the following two lines:

add-apt-repository ppa:user/ppa-name

apt-get install package

Although I do not know what happens with add-apt-repository if it is already present, hopefully nothing.