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copied!<p>Have you looked into <a href="http://book.git-scm.com/5_submodules.html" rel="nofollow noreferrer">git submodules</a>?</p> <p>I use them for this task. We have a repository of helper classes. However, whenever we make additions & improvements, we want those improvements to be cascaded to all of our projects -- so, we set up that helper repository as a submodule in each project repository.</p> <p>Try the following command from within your repository's root directory:</p> <pre><code>git submodule add ssh://url/to/external/library.git local/path </code></pre> <p>This should do the following steps (taken verbatim from the URL above):</p> <blockquote> <ul> <li>Clones the submodule under the current directory and by default checks out the master branch.</li> <li>Adds the submodule's clone path to the <code>.gitmodules</code> file and adds this file to the index, ready to be committed.</li> <li>Adds the submodule's current commit ID to the index, ready to be committed.</li> </ul> </blockquote> <p>You can then use the</p> <pre><code>git submodule update </code></pre> <p>command to keep things up-to-date.</p> <p>Also, as a side note, if you are doing what I am (e.g. making direct changes to the submodule repository), you need to go to the submodule's root repository directory and commit those changes FIRST before committing the super-project. This is because git keeps track of the versions of the submodules (smart), so if you commit the superproject first, you'll be storing a reference to changes that haven't been committed on the submodule repository. Anyone who tries to clone your superproject will get an error. </p>

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