Git submodules are a powerful way to use git as an external dependency management tool. It is basically a way to embed a repository into another. When you add a submodule in Git, the code of the submodule does not get added to the main repository (only certain information about the submodule does); instead, it simply adds a reference to the submodule. This is analogous to the soft link you may have created in your file system.
First, change the directory to the git repository that you want to add the submodule.
git submodule add <submodule_repo_path>
When you do,
you will see that a .gitmodules file has been added, along with the directory corresponding to your git submodule repository.
.gitmodules file contents would be look like:
[submodule "<submodule_name>"] path = <submodule_directory> url = <submodule_repo_path
Now you can,
these two and push it to your remote repo.
On the remote side, you should see a symlink from this repository to the submodule repository.
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