How to traverse and modify nodes in included source?

[Konstantin Molchanov]

Hi! I’m trying to develop an extension for including rst sources from git
repos. Including the source itself is trivial, but I need to adjust the
image paths in order to keep them visible in the final doc.

To do that, I need to parse the included source, traverse through its
nodes, find all `image` nodes, and modify their content.

Any suggestions on how to do that?

Here’s the question on Stackoverflow, so if you know the answer, you could
get some karma:
https://stackoverflow.com/questions/44546652/how-do-i-traverse-and-modify-nodes-in-included-source