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@Tobias-Fischer I am continuing here.
The remaining problem is about the graph sorting.
Basically we have a subset of packages that need to be migrated. However, if we only topologically sort the packages that need to be migrated then we don't end up with the proper sorting. We need to sort the entire graph and then use that to find the right order to build the packages in.
For that we could use either the repodata.json or the rosdistro data. I think I'd like to use the repodata.json info for now, and see if that works out.