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version-control.html
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<!DOCTYPE html><html lang="en-GB"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=next] 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
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slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1">
<h1>Version control with <code>git</code></h1>
<p><img src="Git-Logo-2Color.png" alt="" /></p>
<h5>Denis Schluppeck, 2019-03-01</h5>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2">
<h2>Why version control?</h2>
<p>Lots of good reasons - but the main ones<sup><a href="#myfootnote1">1</a></sup> are:</p>
<ul>
<li>a complete <strong>history of changes</strong> (which means you can <em>undo</em>)</li>
<li><strong>branches</strong> (you can try new stuff out without breaking things)</li>
<li>you can trace who did what when, <strong>tag</strong> versions of your manuscript / code
<ul>
<li>submitted, published</li>
<li>v1.0, feature-release</li>
</ul>
</li>
</ul>
<br />
<hr />
<p><a name="myfootnote1"><sup>1</sup></a> see e.g. <a href="https://www.atlassian.com/git/tutorials/what-is-version-control#benefits-of-version-control">"What is version control"</a></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3">
<h2>Imagine a typical project (code / notes)</h2>
<center>
<figure>
<img src="https://git-scm.com/book/en/v2/images/deltas.png" alt="my alt text" />
<hr />
<figcaption>How material changes over time... </figcaption>
</figure>
</center>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4">
<h2>Why <code>git</code>?</h2>
<p>There are many <em>version control systems</em> (VCS). But <code>git</code> comes with some advantages:</p>
<ul>
<li>it's <strong>distributed</strong> (full version history in your local copy)</li>
<li>corollary: you can work with it anywhere <img class="emoji" draggable="false" alt="✈️" src="https://twemoji.maxcdn.com/2/svg/2708.svg" data-marp-twemoji=""/> or <img class="emoji" draggable="false" alt="🚋" src="https://twemoji.maxcdn.com/2/svg/1f68b.svg" data-marp-twemoji=""/> (no need for network connection)</li>
<li>it's widely used<sup>1</sup></li>
</ul>
<br />
<hr />
<p><a name="myfootnote1"><sup>1</sup></a> see e.g. <a href="https://en.wikipedia.org/wiki/Git">"Wikipedia / git"</a></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5">
<h2><code>git</code> does snapshots</h2>
<ul>
<li>think of this as snapshots</li>
<li>what's the state of each file now?</li>
</ul>
<br />
<center>
<figure>
<img src="https://git-scm.com/book/en/v2/images/snapshots.png" alt="my alt text" />
</figure>
</center>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6">
<h2>How are things tagged?</h2>
<center>
<figure>
<img src="Fingerprint_picture.svg" alt="fingerprint" height="400p" />
</figure>
</center>
<hr />
<tiny>
<a name="myfootnote1"><sup>2</sup></a> [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0)
</tiny>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7">
<h2>How are things tagged?</h2>
<ul>
<li>each <strong>file</strong> has a unique <em>fingerprint</em> (<code>shasum</code>)</li>
<li>if the file changes, the <em>fingerprint</em> changes, too!</li>
<li><code>sha</code> = secure hash algorithm</li>
<li><code>sha</code> turns text/data into a 40 digit hexadecimal number</li>
</ul>
<br />
<hr />
<p>hexadecimal numbers?</p>
<pre>
0...9 10 11 12 13 14 15 # decimal
0...9 a b c d e f # hexadecimal
0 1 10 11 100 101 ... 111 # binary
</pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8">
<h2><code>shasum</code> of a file</h2>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>shasum Introduction.md
<span class="hljs-comment"># b5acbb35abd2511a4c05e48ef58f8990f139793a Introduction.md</span>
</span></span></foreignObject></svg></code></pre>
<br />
<p><strong>tiny change, e.g. add a space?!</strong> and calculate SHA again:</p>
<br />
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>shasum Introduction.md
<span class="hljs-comment"># 502bbcb5ab4f0d8127396675dd7d17d7d8b55b0a Introduction.md</span>
</span></span></foreignObject></svg></code></pre>
<p>... completely different.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9">
<h2>How are things tagged (2)?</h2>
<p>A similar trick works for a list of directory contents (the "tree")</p>
<p><img class="emoji" draggable="false" alt="➡️" src="https://twemoji.maxcdn.com/2/svg/27a1.svg" data-marp-twemoji=""/> <strong>tree hash</strong></p>
<br />
<pre><code class="language-code"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>.
├── analysis
├── stimulusCode
│ └── stims
│ ├── houses
│ ├── normal
│ ├── objects
│ └── scrambled
└── unix-intro
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10">
<h2>How are things tagged (3)? - <code>commit</code></h2>
<ul>
<li>information about files (aka <strong>blobs</strong>), their relationship to each other (the <strong>tree</strong>), the previous state (<strong>parent</strong>) and a message make up a <code>commit</code></li>
</ul>
<br />
<small>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git cat-file -p HEAD
tree 80fc45cae348efbdbbb652642cf4c22e1ddaaf80
parent b2b3a018fa2569bc5aa54b0b744145f6758bcba7
author Denis Schluppeck <[email protected]> 1517238320 +0000
committer Denis Schluppeck <[email protected]> 1517238320 +0000
fixes http to https
</span></span></foreignObject></svg></code></pre>
</small>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11">
<h2>Workflow</h2>
<center>
<figure>
<img src="https://git-scm.com/images/about/[email protected]" alt="my alt text" />
<figcaption>Files </figcaption>
</figure>
</center>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12">
<h2>Let's try it</h2>
<ul>
<li>make a directory, <code>cd</code> into it</li>
<li>initialize repo</li>
</ul>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>mkdir <span class="hljs-built_in">test</span> && <span class="hljs-built_in">cd</span> <span class="hljs-built_in">test</span>
git init
</span></span></foreignObject></svg></code></pre>
<ul>
<li>make a text file <code>test.txt</code></li>
<li>write something into it and save it</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13">
<h2>Let's try it (2)</h2>
<ul>
<li>add to staging area</li>
<li>... and try to commit with a message (<code>-m</code>)</li>
</ul>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git add test.txt
git commit -m <span class="hljs-string">'my first commit'</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14">
<h2>Warnings?</h2>
<ul>
<li>you'll see some warning messages</li>
<li>for (only this first time), set up your <code>user.name</code> and <code>user.email</code></li>
</ul>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git config --global user.name <span class="hljs-string">"First Last"</span> <span class="hljs-comment"># your name</span>
git config --global user.email <span class="hljs-string">"[email protected]"</span> <span class="hljs-comment"># your email</span>
</span></span></foreignObject></svg></code></pre>
<ul>
<li>This info is stored on your machine in a little file, which you can inspect</li>
</ul>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>more ~/.gitconfig
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15">
<h2>Now complete the commit</h2>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git status <span class="hljs-comment"># read what's there</span>
git commit -m <span class="hljs-string">'my first commit'</span>
git status <span class="hljs-comment"># read what's there NOW</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16">
<h2>If you want this on github</h2>
<p>Currently the repository is local to the machine you are working on, if you want to share with your friends and colleagues on <code>github.com</code>, follow instructions at:</p>
<p><a href="https://help.github.com/en/articles/adding-an-existing-project-to-github-using-the-command-line">https://help.github.com/en/articles/adding-an-existing-project-to-github-using-the-command-line</a></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17">
<h2>Notes</h2>
<ul>
<li>
<p>Illustrations linked from <a href="https://git-scm.com/book/en/v2/">https://git-scm.com/book/en/v2/</a> - Creative Commons license <a href="https://creativecommons.org/licenses/by-nc-sa/3.0/">CC BY-NC-SA 3.0</a></p>
</li>
<li>
<p>Details on <code>shasum</code> (available as a UNIX command):</p>
</li>
</ul>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>man shasum <span class="hljs-comment"># or</span>
info shasum
</span></span></foreignObject></svg></code></pre>
</section>
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