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How to manage a submodule that has submodules
Create
Use the standard way of creating a submodule and adding it to .gitsubmodules.
In the next bit, the recursive part comes.
Update
We need to --recursive to include submodules. And --init in case they were not initialized.
$ git submodule update --init --recursive
Going further to update each submodule in there. From SO.
$ git submodule update --init --recursive
$ git submodule foreach --recursive git fetch
$ git submodule foreach git merge origin master