Git Submodule How-To

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To add a submodule, first move to the container directory, and type this.

git submodule add http://...

To sync the submodule working tree files to current branch'es current commit, type this.

git submodule update

To remove a submodule, move to the container directory and type this.

git submodule deinit ./your_submodule...
git rm ./your_submodule...

Don't forget to rm the submodule directory. Otherwise the submodule will become a wondering zombie, and it's far harder to treat.