Whenever I use submodules in git find myself doing
git submodule init
git submodule update
What's the logic in two commands when you basicly do those commands every time?
git submodule init initializes the machinery, whereas git submodule update pulls in new changes for the submodules. If you're adding a submodule, there's nothing to update yet, so you only need to run git submodule init to initialize the repo. (It creates a .gitmodules file, as well as some stuff in .git/ for tracking submodules.)