How to extract a subproject

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data-toc-headings="h1,h2,h3,h4,h5,h6"></ul> </div> </section>  <div class="container"> <header class="major special"> <h1>How to extract a subproject</h1> </header> </div>   <section id="page" class="main style1"> <div class="container"> <div class="box alt"></div> <div id="content" class="page-content"> <p>Sometimes, a piece of functionality is developed as part of one project, but grows so much as to warrant becoming its own, separate project.</p> <p>This tutorial describes how to split part of a Git repository into its own dedicated Git repository, preserving only the history relevant to the subproject being extracted.</p> <h2 id="extract-the-revision-history">Extract the revision history</h2> <ol> <li> <p>Use Git鈥檚 <em>filter-branch</em> feature to extract the Git history of only the subproject:</p> <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>git filter-branch <span class="nt">-f</span> <span class="nt">--prune-empty</span> <span class="nt">--subdirectory-filter</span> <subdir> </code></pre></div> </div> <p>Where <code class="language-plaintext highlighter-rouge"><subdir></code> is the folder containing the subproject鈥檚 source code.</p> </li> </ol> <h2 id="update-the-maven-build">Update the Maven build</h2> <p>Assuming you are using <a href="/develop/maven">Maven</a> to build the subproject:</p> <ol> <li> <p>Add an <em><scm></em> section to the <em>pom.xml</em> to reflect the new remote repository鈥檚 URL (see <a href="https://github.com/scijava/jep/commit/b76f4a1df830c090fc96ab99bb145dd67e8e69ce">example</a>):</p> <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>vi pom.xml git commit <span class="nt">-m</span> <span class="s1">'Add SCM location'</span> pom.xml </code></pre></div> </div> </li> <li> <p>Replace the old <em><parent></em> with a new one, such as <a href="https://github.com/scijava/pom-scijava">pom-scijava</a>, <a href="https://github.com/imagej/pom-imagej">pom-imagej</a> or <a href="https://github.com/fiji/pom-fiji">pom-fiji</a> (see <a href="https://github.com/scijava/jep/commit/336c0a46fad855508aaa905a9f82e5d88136df91">example</a>)鈥攐r remove the <em><parent></em> altogether.</p> </li> <li> <p>Add a <em><developers></em> section to the <em>pom.xml</em> to indicate the project developers (see <a href="https://github.com/fiji/plugins/trackmate/commit/f0c2cf6cca3e198ba5b9283a71fc564f41c642d5">example</a>). You can also add <em><contributors></em> if desired and relevant.</p> </li> <li> <p>Make sure the project still builds:</p> <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>mvn clean package </code></pre></div> </div> </li> <li> <p>Add (or adjust) the <em>.gitignore</em> file (see <a href="https://github.com/fiji/spimreconstruction/commit/cf95dcc06b31c0044b58213c12f886027a5eb3ba">example</a>).</p> </li> </ol> <h2 id="push-the-changes">Push the changes</h2> <ol> <li> <p>Make sure that all your changes look good:</p> <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>git status git diff </code></pre></div> </div> <p>This is good advice in general: check <code class="language-plaintext highlighter-rouge">git status</code> and <code class="language-plaintext highlighter-rouge">git diff</code> <em>every time</em> before you commit, to prevent making a fool out of yourself.</p> </li> <li> <p>Commit everything, mentioning the commit of the parent project from which history was rewritten (see <a href="https://github.com/scijava/jep/commit/660930836860c6f67ecb53d091eb1730ecb68c80">example</a>):</p> <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>git add <span class="nb">.</span> <span class="o">&&</span> git commit <span class="nt">-s</span> </code></pre></div> </div> </li> <li> <p>Create a new repository somewhere for the new project鈥攚e recommend <a href="/develop/github">GitHub</a>.</p> </li> <li> <p>Connect your repository with the remote one:</p> <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>git remote set-url origin git@github.com:my-org/my-new-project </code></pre></div> </div> <p>Where <em>git@github.com:my-org/my-new-project</em> is the remote URL for the new project鈥檚 dedicated repository.</p> </li> <li> <p>Push the resultant history to the project鈥檚 new repository:</p> <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>git push <span class="nt">-u</span> origin master </code></pre></div> </div> </li> </ol> <h2 id="change-any-online-resources">Change any online resources</h2> <ol> <li>Edit the relevant web page(s) to reflect the new Git repository location</li> <li>Update any other known links to the project</li> </ol> </div> </div> </section>  <section id="footer"> <ul class="icons"> <li><a href="https://forum.image.sc/tag/imagej" class="icon alt"><img src="/media/icons/image-sc.png" width="24" style="vertical-align: middle; margin-top: -10px"><span class="label">Forum</span></a></li> <li><a href="https://twitter.com/hashtag/ImageJ" class="icon brands alt fa-twitter"><span class="label">Twitter</span></a></li> <li><a href="https://github.com/imagej" class="icon brands alt fa-github"><span class="label">GitHub</span></a></li> </ul> <ul class="copyright"> <li>Design: <a href="http://html5up.net">HTML5 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How to extract a subproject