What is a subproject commit?

Question

I\'m trying to add the Laravel files to a Github repo.

I ran

$ git clone https://github.com/laravel/laravel.git

The files show up fine loca

Answer 1

A submodule commit is a gitlink, special entry recorded in the index, created when you add a submodule to your repo;

It records the SHA1 currently referenced by the parent repo.

A git submodule update --init is enough to populate the laravel subdirectory in your repo.

Once it is filled, note that your submodule repo is in a detached HEAD mode.

As shown here, when switching branches in the parent repo, your submodule gitlink will change accordingly, but your submodule content won't change until you make again a git submodule update (after the git checkout)