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git-internals.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>git internals</title>
<meta name="author" content="Piotr Jasiun">
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<div class="slides">
<section>
<section>
<h1>git internals</h1>
<p>Created by <a href="mailto:piotr@jasiun.pl">Piotr Jasiun</a></p>
</section>
<section>
<blockquote>
<p>"First, if it isn’t yet clear, Git is fundamentally a content-addressable filesystem with a VCS user interface written on top of it."</p>
</blockquote>
<footer><cite><a href="http://git-scm.com/book/en/Git-Internals">Pro Git</a></cite></footer>
</section>
</section>
<section>
<div class="column">
<h2>Porcelain</h2>
<ul>
<li>git commit</li>
<li>git checkout</li>
<li>git add</li>
<li>git merge</li>
<li>git reset</li>
<li>git stash</li>
<li>git pull</li>
<li>git rebase</li>
<li>...</li>
</ul>
</div>
<div class="column">
<h2>Plumbing</h2>
<ul>
<li>git hash-object</li>
<li>git cat-file</li>
<li>git write-tree</li>
<li>git mktree</li>
<li>git update-index</li>
<li>git commit-tree</li>
<li>git symbolic-ref</li>
<li>git rev-parse</li>
<li>...</li>
</ul>
</div>
</section>
<section>
<h2>.git</h2>
<ul>
<li>branches/<span class="fragment" data-fragment-index="1"> - not used</span></li>
<li>config</li>
<li>description<span class="fragment" data-fragment-index="2"> - only used by the GitWeb program</span></li>
<li><span class="fragment highlight-current-red" data-fragment-index="5">HEAD</span></li>
<li>hooks/<span class="fragment" data-fragment-index="3"> - client- or server-side hook scripts</span></li>
<li><span class="fragment highlight-current-red" data-fragment-index="5">index</span></li>
<li><span class="fragment highlight-current-red" data-fragment-index="5">objects/</span></li>
<li><span class="fragment highlight-current-red" data-fragment-index="5">refs/</span></li>
<li>info/<span class="fragment" data-fragment-index="4"> - global exclude file that you don’t want to track in a .gitignore file</span></li>
</lu>
</section>
<section>
<h2>Git Objects: Blob and Tree</h2>
<p><img src="./images/git-internals/tree-blob.png"></p>
</section>
<section>
<h2>Git Objects: Commit</h2>
<p><img src="./images/git-internals/commit-tree-blob-details.png"></p>
</section>
<section>
<h2>Git Objects: Commit</h2>
<p><img src="./images/git-internals/commit-tree-blob.jpg"></p>
</section>
<section>
<section>
<h2>References</h2>
<p><img src="./images/git-internals/refs-commit-tree-blob.png"></p>
<ul class="fragment">
<li>HEAD, branches (local and remote) and tags are files with commits hashes,</li>
<li>annotated tags are obeject (like commit or blob),</li>
<li>HEAD could be a reference to the branch:
<pre><code>ref: refs/heads/master</code></pre>
</li>
</ul>
</section>
<section>
<h2>Remotes</h2>
<pre><code class="ini">
[remote "origin"]
url = git@github.com:schacon/simplegit-progit.git
fetch = +refs/heads/*:refs/remotes/origin/*
</code></pre>
</section>
</section>
<section>
<h2>Packfiles</h2>
<ul>
<li>git gc - garbage collection,</li>
<li>.idx and .pack files,</li>
<li>one snapshots and diffs,</li>
<li>repacking,</li>
<li>smaller than SVN.</li>
</ul>
</section>
<section>
<h2>Summary</h2>
<ul>
<li>whole repo is it the .git directory,</li>
<li>git works like a filesystem or NoSQL database,</li>
<li>every commit contains files, not diffs,</li>
<li>HEAD, branches and tags are references to commits,</li>
<li>if you need you can become a plumber.</li>
</ul>
</section>
<section>
<section>
<p><img src="./images/git-internals/thats-all-folks.jpg"></p>
</section>
<section>
<h2>Links</h2>
<ul>
<li><a href="http://git-scm.com/book/en/Git-Internals">Pro Git - Git Internals</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git.html">git commands</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git-hash-object.html">git hash-object</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git-cat-file.html">git cat-file</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git-write-tree.html">git write-tree</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git-update-index.html">git update-index</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git-commit-tree.html">git commit-tree</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git-mktree.html">git mktree</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git-symbolic-ref.html">git symbolic-ref</a></li>
<li><a href="https://www.kernel.org/pub/software/scm/git/docs/git-rev-parse.html">git rev-parse</a></li>
<li><a href="http://alblue.bandlem.com/2011/08/git-tip-of-week-trees.html">git trees article</a></li>
<li><a href="http://stackoverflow.com/questions/5772192/git-how-can-i-reconcile-detached-head-with-master-origin">detached HEAD</a></li>
</ul>
</section>
</section>
</div>
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