8.5 Using Git Submodules to Track External Repositories
Sometimes you need to track multiple repositories as if they’re all in the same repository. This might be because of a dependency on some third-party library or possibly because your in-house project has been divided into multiple projects to help make them more manageable.
Git allows you to track external repositories through what it
calls submodules. These allow you to store
a repository within another repository while keeping the
two histories completely independent. Those coming from a
Subversion background might recognize these as
svn:externals.
Adding a New Submodule
Let’s demonstrate this behavior. First we need to create a new repository that will house our submodule repository. ...
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