Post on rm -rf rickrolling
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layout: post
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title: "How to rickroll people that try to run \"rm -rf\" on your system"
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date: 2016-07-28 16:00:00 +0200
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categories: linux
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---
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**WARNING: The method showed here could not prevent the actual execution of "rm -rf" if the "UNIX vandal" is clever enough. Proceed at your own risk, and make backups!**
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I like Rick Astley late 80's songs, and you can see them here in my Spotify:
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I like rickrolling people myself too, especially if they're trying to delete my entire `/home` directory or, even worse, `/`. Since I learned how to use the `alias` built-in, I wanted a way to prevent that random people tinkering with my laptop (that I may forgot to lock) could delete potentially important stuff, just for fun or boredom.
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The method that I'll show will lock any `rm` command runned in both recursive and force mode, so `rm -rf`, `rm -f -r` and `rm -r --force` are all blocked, even if they are launched by `sudo`. I'm going to alias the rm command in `/etc/profile` `/etc/bash.bashrc` and in `/etc/zsh/zshrc` (I'm a zsh user) so that the rickroll will be possible from all users, even root and the ones with a brand new `bashrc` or `zshrc`. Here is the code I appended to those files:
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{% highlight bash %}
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alias rm=/bin/rmAlias
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alias sudo='sudo ' # this enables aliases in sudo, see http://askubuntu.com/questions/22037/aliases-not-available-when-using-sudo
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{% endhighlight %}
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Since `alias` is not able to control the flags of the aliases (see [here](http://apple.stackexchange.com/questions/50963/how-do-i-add-a-flag-to-an-alias)), we're going to redirect each call of `rm` to `/bin/rmAlias`, that would run the command if it's safe. I didn't use a function because it's a bit tricky to make that work with `sudo`. So, let's see the code I put in `rmAlias`:
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{% highlight bash %}
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#! /bin/bash
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# Rickroll whoever tries to desert this system, even root.
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# To achieve this, set the appropriate aliases even in /etc/profile and similars.
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# Video played when rickrolling
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ROLLVIDEO=/opt/anti-rm/serious-video.mkv # it's just Never Gonna Give You Up on my system, but be free to customize this!
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rickroll(){
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echo "Never gonna desert this system..."
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xdg-open $ROLLVIDEO 2>&1 &
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exit 0
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}
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while getopts ":rf-" opt; do
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# Prevent '--force' to be detected as -r and -f
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if [ "$opt" = "-" ]; then
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OPTIND=$OPTIND+1
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continue
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fi
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if [ "$opt" = "r" ] || [ "$opt" = "f" ]; then
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if [ "$tmp" = "" ]; then
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tmp=$opt
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continue
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elif [ "$tmp" != "$opt" ]; then
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rickroll
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fi
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fi
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done
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for var in "$@"
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do
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if [[ "$var" = "--force" && "$tmp" = "r" ]]; then
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rickroll
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fi
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done
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# If it's safe, just run rm
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/bin/rm "$@"
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exit $?
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{% endhighlight %}
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It may look messy to a UNIX guy more experienced than me, but it works. The `getopts` built-in sees if both the `-r` and the `-f` flags are used and, if so, it starts `rickroll()`, which opens with `xdg-open` that amazing clip from RickAstleyVEVO. From line 30 and below, the script checks if the `--force` flag is used instead of `-f`.
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Give execute permissions to the script we've just created:
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{% highlight bash %}
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# chmod +x /bin/rmAlias
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{% endhighlight %}
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Restart your shell, and enjoy. If you want to test safely, I suggest trying to run `rm -rf` with no folders or one nonexistant, since this script stop even these commands.
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If you want even more security, you can rename this script to `/bin/rm` and move the original one in some other place, getting rid of all the aliases. I prefer the solution above because it's tidier: you haven't to move anything. In fact, this could be just an AUR package...
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<p>WARNING: this</p>
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@ -0,0 +1,8 @@
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<hr />
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<p>layout: post
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title: “How to rickroll people that run “rm -rf” on your system”
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date: 2016-07-28 18:00:00 +0200
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categories: linux
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—-</p>
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<p>WARNING: this</p>
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@ -6,10 +6,86 @@
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</description>
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<link>http://praticamentetilde.github.io/</link>
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<atom:link href="http://praticamentetilde.github.io/feed.xml" rel="self" type="application/rss+xml"/>
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<pubDate>Tue, 12 Jul 2016 20:21:14 +0200</pubDate>
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<lastBuildDate>Tue, 12 Jul 2016 20:21:14 +0200</lastBuildDate>
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<pubDate>Thu, 28 Jul 2016 15:51:30 +0200</pubDate>
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<lastBuildDate>Thu, 28 Jul 2016 15:51:30 +0200</lastBuildDate>
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<generator>Jekyll v3.1.6</generator>
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<item>
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<title>How to rickroll people that try to run "rm -rf" on your system</title>
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<description><p><strong>WARNING: The method showed here could not prevent the actual execution of “rm -rf” if the “UNIX vandal” is clever enough. Proceed at your own risk, and make backups!</strong></p>
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|
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<p>I like Rick Astley late 80’s songs, and you can see them here in my Spotify:</p>
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<p><img src="https://dl.dropboxusercontent.com/s/t9vywa4yjotxv0o/Screenshot_20160728_154506.png?dl=0" alt="dQw4w9WgXcQ" /></p>
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<p>I like rickrolling people myself too, especially if they’re trying to delete my entire <code class="highlighter-rouge">/home</code> directory or, even worse, <code class="highlighter-rouge">/</code>. Since I learned how to use the <code class="highlighter-rouge">alias</code> built-in, I wanted a way to prevent that random people tinkering with my laptop (that I may forgot to lock) could delete potentially important stuff, just for fun or boredom.</p>
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<p>The method that I’ll show will lock any <code class="highlighter-rouge">rm</code> command runned in both recursive and force mode, so <code class="highlighter-rouge">rm -rf</code>, <code class="highlighter-rouge">rm -f -r</code> and <code class="highlighter-rouge">rm -r --force</code> are all blocked, even if they are launched by <code class="highlighter-rouge">sudo</code>. I’m going to alias the rm command in <code class="highlighter-rouge">/etc/profile</code> <code class="highlighter-rouge">/etc/bash.bashrc</code> and in <code class="highlighter-rouge">/etc/zsh/zshrc</code> (I’m a zsh user) so that the rickroll will be possible from all users, even root and the ones with a brand new <code class="highlighter-rouge">bashrc</code> or <code class="highlighter-rouge">zshrc</code>. Here is the code I appended to those files:</p>
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<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="nb">alias </span><span class="nv">rm</span><span class="o">=</span>/bin/rmAlias
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<span class="nb">alias </span><span class="nv">sudo</span><span class="o">=</span><span class="s1">'sudo '</span> <span class="c"># this enables aliases in sudo, see http://askubuntu.com/questions/22037/aliases-not-available-when-using-sudo</span></code></pre></figure>
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<p>Since <code class="highlighter-rouge">alias</code> is not able to control flags of the aliases (see <a href="http://apple.stackexchange.com/questions/50963/how-do-i-add-a-flag-to-an-alias">here</a>), we’re going to redirect each call of <code class="highlighter-rouge">rm</code> to <code class="highlighter-rouge">/bin/rmAlias</code>, that would run the command if it’s safe. I didn’t use a function because it’s a bit tricky to make that work with <code class="highlighter-rouge">sudo</code>. So, let’s see the code I put in <code class="highlighter-rouge">rmAlias</code>:</p>
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<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="c">#! /bin/bash</span>
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<span class="c"># Rickroll whoever tries to desert this system, even root.</span>
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<span class="c"># To achieve this, set the appropriate aliases even in /etc/profile and similars.</span>
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<span class="c"># Video played when rickrolling</span>
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<span class="nv">ROLLVIDEO</span><span class="o">=</span>/opt/anti-rm/serious-video.mkv <span class="c"># it's just Never Gonna Give You Up on my system, but be free to customize this!</span>
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rickroll<span class="o">(){</span>
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<span class="nb">echo</span> <span class="s2">"Never gonna desert this system..."</span>
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xdg-open <span class="nv">$ROLLVIDEO</span> 2&gt;&amp;1 &amp;
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<span class="nb">exit </span>0
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<span class="o">}</span>
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<span class="k">while </span><span class="nb">getopts</span> <span class="s2">":rf-"</span> opt; <span class="k">do</span>
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<span class="c"># Prevent '--force' to be detected as -r and -f</span>
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<span class="k">if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"-"</span> <span class="o">]</span>; <span class="k">then
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</span><span class="nv">OPTIND</span><span class="o">=</span><span class="nv">$OPTIND</span>+1
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<span class="k">continue
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fi
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if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"r"</span> <span class="o">]</span> <span class="o">||</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"f"</span> <span class="o">]</span>; <span class="k">then
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if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">""</span> <span class="o">]</span>; <span class="k">then
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</span><span class="nv">tmp</span><span class="o">=</span><span class="nv">$opt</span>
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<span class="k">continue
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elif</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> !<span class="o">=</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">]</span>; <span class="k">then
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</span>rickroll
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<span class="k">fi
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fi
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done
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for </span>var <span class="k">in</span> <span class="s2">"</span><span class="nv">$@</span><span class="s2">"</span>
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<span class="k">do
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if</span> <span class="o">[[</span> <span class="s2">"</span><span class="nv">$var</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"--force"</span> <span class="o">&amp;&amp;</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"r"</span> <span class="o">]]</span>; <span class="k">then
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</span>rickroll
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<span class="k">fi
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done</span>
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<span class="c"># If it's safe, just run rm</span>
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/bin/rm <span class="s2">"</span><span class="nv">$@</span><span class="s2">"</span>
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<span class="nb">exit</span> <span class="nv">$?</span></code></pre></figure>
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<p>It may look messy to a UNIX guy more experienced than me, but it works. The <code class="highlighter-rouge">getopts</code> built-in sees if both the <code class="highlighter-rouge">-r</code> and the <code class="highlighter-rouge">-f</code> flags are used and, if so, it starts <code class="highlighter-rouge">rickroll()</code>, which opens with <code class="highlighter-rouge">xdg-open</code> that amazing clip from RickAstleyVEVO. From line 30 and below, the script checks if the <code class="highlighter-rouge">--force</code> flag is used instead of <code class="highlighter-rouge">-f</code>.</p>
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<p>Give execute permissions to the script we’ve just created:</p>
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<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="c"># chmod +x /bin/rmAlias</span></code></pre></figure>
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<p>Restart your shell, and enjoy. If you want to test safely, I suggest trying to run <code class="highlighter-rouge">rm -rf</code> with no folders or one nonexistant, since this script stop even these commands.</p>
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<p>If you want even more security, you can rename this script to <code class="highlighter-rouge">/bin/rm</code> and move the original one in some other place, getting rid of all the aliases. I prefer the solution above because it’s tidier: you haven’t to move anything. In fact, this could be just an AUR package…</p>
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</description>
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<pubDate>Thu, 28 Jul 2016 16:00:00 +0200</pubDate>
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<link>http://praticamentetilde.github.io/linux/2016/07/28/how-to-rickroll-people-launching-rm-rf-on-your-system.html</link>
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<guid isPermaLink="true">http://praticamentetilde.github.io/linux/2016/07/28/how-to-rickroll-people-launching-rm-rf-on-your-system.html</guid>
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<category>linux</category>
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</item>
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<item>
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<title>Installing Gentoo on a Lenovo ThinkPad X60s</title>
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<description><p>My only laptop is a <a href="http://www.thinkwiki.org/wiki/Category:X60s">IBM/Lenovo ThinkPad X60s</a>, a top line “ultrabook” from 2006 that features:</p>
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<span class="post-meta">Jul 28, 2016</span>
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<h2>
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<a class="post-link" href="/linux/2016/07/28/how-to-rickroll-people-launching-rm-rf-on-your-system.html">How to rickroll people that try to run "rm -rf" on your system</a>
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</h2>
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</li>
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<li>
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<span class="post-meta">Jul 12, 2016</span>
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<title>How to rickroll people that try to run "rm -rf" on your system</title>
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<meta name="description" content="WARNING: The method showed here could not prevent the actual execution of “rm -rf” if the “UNIX vandal” is clever enough. Proceed at your own risk, and make ...">
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<h1 class="post-title" itemprop="name headline">How to rickroll people that try to run "rm -rf" on your system</h1>
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<p class="post-meta"><time datetime="2016-07-12T13:00:00+02:00" itemprop="datePublished">Jul 12, 2016</time></p>
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<div class="post-content" itemprop="articleBody">
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<p><strong>WARNING: The method showed here could not prevent the actual execution of “rm -rf” if the “UNIX vandal” is clever enough. Proceed at your own risk, and make backups!</strong></p>
|
||||
|
||||
<p>I like Rick Astley late 80’s songs, and you can see them here in my Spotify:</p>
|
||||
|
||||
<p><img src="https://dl.dropboxusercontent.com/s/t9vywa4yjotxv0o/Screenshot_20160728_154506.png?dl=0" alt="dQw4w9WgXcQ" /></p>
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|
||||
<p>I like rickrolling people myself too, especially if they’re trying to delete my entire <code class="highlighter-rouge">/home</code> directory or, even worse, <code class="highlighter-rouge">/</code>. Since I learned how to use the <code class="highlighter-rouge">alias</code> built-in, I wanted a way to prevent that random people tinkering with my laptop (that I may forgot to lock) could delete potentially important stuff, just for fun or boredom.</p>
|
||||
|
||||
<p>The method that I’ll show will lock any <code class="highlighter-rouge">rm</code> command runned in both recursive and force mode, so <code class="highlighter-rouge">rm -rf</code>, <code class="highlighter-rouge">rm -f -r</code> and <code class="highlighter-rouge">rm -r --force</code> are all blocked, even if they are launched by <code class="highlighter-rouge">sudo</code>. I’m going to alias the rm command in <code class="highlighter-rouge">/etc/profile</code> <code class="highlighter-rouge">/etc/bash.bashrc</code> and in <code class="highlighter-rouge">/etc/zsh/zshrc</code> (I’m a zsh user) so that the rickroll will be possible from all users, even root and the ones with a brand new <code class="highlighter-rouge">bashrc</code> or <code class="highlighter-rouge">zshrc</code>. Here is the code I appended to those files:</p>
|
||||
|
||||
<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="nb">alias </span><span class="nv">rm</span><span class="o">=</span>/bin/rmAlias
|
||||
<span class="nb">alias </span><span class="nv">sudo</span><span class="o">=</span><span class="s1">'sudo '</span> <span class="c"># this enables aliases in sudo, see http://askubuntu.com/questions/22037/aliases-not-available-when-using-sudo</span></code></pre></figure>
|
||||
|
||||
<p>Since <code class="highlighter-rouge">alias</code> is not able to control flags of the aliases (see <a href="http://apple.stackexchange.com/questions/50963/how-do-i-add-a-flag-to-an-alias">here</a>), we’re going to redirect each call of <code class="highlighter-rouge">rm</code> to <code class="highlighter-rouge">/bin/rmAlias</code>, that would run the command if it’s safe. I didn’t use a function because it’s a bit tricky to make that work with <code class="highlighter-rouge">sudo</code>. So, let’s see the code I put in <code class="highlighter-rouge">rmAlias</code>:</p>
|
||||
|
||||
<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="c">#! /bin/bash</span>
|
||||
<span class="c"># Rickroll whoever tries to desert this system, even root.</span>
|
||||
<span class="c"># To achieve this, set the appropriate aliases even in /etc/profile and similars.</span>
|
||||
|
||||
<span class="c"># Video played when rickrolling</span>
|
||||
<span class="nv">ROLLVIDEO</span><span class="o">=</span>/opt/anti-rm/serious-video.mkv <span class="c"># it's just Never Gonna Give You Up on my system, but be free to customize this!</span>
|
||||
|
||||
rickroll<span class="o">(){</span>
|
||||
<span class="nb">echo</span> <span class="s2">"Never gonna desert this system..."</span>
|
||||
xdg-open <span class="nv">$ROLLVIDEO</span> 2>&1 &
|
||||
<span class="nb">exit </span>0
|
||||
<span class="o">}</span>
|
||||
|
||||
<span class="k">while </span><span class="nb">getopts</span> <span class="s2">":rf-"</span> opt; <span class="k">do</span>
|
||||
<span class="c"># Prevent '--force' to be detected as -r and -f</span>
|
||||
<span class="k">if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"-"</span> <span class="o">]</span>; <span class="k">then
|
||||
</span><span class="nv">OPTIND</span><span class="o">=</span><span class="nv">$OPTIND</span>+1
|
||||
<span class="k">continue
|
||||
fi
|
||||
if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"r"</span> <span class="o">]</span> <span class="o">||</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"f"</span> <span class="o">]</span>; <span class="k">then
|
||||
if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">""</span> <span class="o">]</span>; <span class="k">then
|
||||
</span><span class="nv">tmp</span><span class="o">=</span><span class="nv">$opt</span>
|
||||
<span class="k">continue
|
||||
elif</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> !<span class="o">=</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">]</span>; <span class="k">then
|
||||
</span>rickroll
|
||||
<span class="k">fi
|
||||
fi
|
||||
done
|
||||
|
||||
for </span>var <span class="k">in</span> <span class="s2">"</span><span class="nv">$@</span><span class="s2">"</span>
|
||||
<span class="k">do
|
||||
if</span> <span class="o">[[</span> <span class="s2">"</span><span class="nv">$var</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"--force"</span> <span class="o">&&</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"r"</span> <span class="o">]]</span>; <span class="k">then
|
||||
</span>rickroll
|
||||
<span class="k">fi
|
||||
done</span>
|
||||
|
||||
<span class="c"># If it's safe, just run rm</span>
|
||||
/bin/rm <span class="s2">"</span><span class="nv">$@</span><span class="s2">"</span>
|
||||
<span class="nb">exit</span> <span class="nv">$?</span></code></pre></figure>
|
||||
|
||||
<p>It may look messy to a UNIX guy more experienced than me, but it works. The <code class="highlighter-rouge">getopts</code> built-in sees if both the <code class="highlighter-rouge">-r</code> and the <code class="highlighter-rouge">-f</code> flags are used and, if so, it starts <code class="highlighter-rouge">rickroll()</code>, which opens with <code class="highlighter-rouge">xdg-open</code> that amazing clip from RickAstleyVEVO. From line 30 and below, the script checks if the <code class="highlighter-rouge">--force</code> flag is used instead of <code class="highlighter-rouge">-f</code>.</p>
|
||||
|
||||
<p>Give execute permissions to the script we’ve just created:</p>
|
||||
|
||||
<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="c"># chmod +x /bin/rmAlias</span></code></pre></figure>
|
||||
|
||||
<p>Restart your shell, and enjoy. If you want to test safely, I suggest trying to run <code class="highlighter-rouge">rm -rf</code> with no folders or one nonexistant, since this script stop even these commands.</p>
|
||||
|
||||
<p>If you want even more security, you can rename this script to <code class="highlighter-rouge">/bin/rm</code> and move the original one in some other place, getting rid of all the aliases. I prefer the solution above because it’s tidier: you haven’t to move anything. In fact, this could be just an AUR package…</p>
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<h1 class="post-title" itemprop="name headline">How to rickroll people that try to run "rm -rf" on your system</h1>
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<p class="post-meta"><time datetime="2016-07-28T16:00:00+02:00" itemprop="datePublished">Jul 28, 2016</time></p>
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<div class="post-content" itemprop="articleBody">
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||||
<p><strong>WARNING: The method showed here could not prevent the actual execution of “rm -rf” if the “UNIX vandal” is clever enough. Proceed at your own risk, and make backups!</strong></p>
|
||||
|
||||
<p>I like Rick Astley late 80’s songs, and you can see them here in my Spotify:</p>
|
||||
|
||||
<p><img src="https://dl.dropboxusercontent.com/s/t9vywa4yjotxv0o/Screenshot_20160728_154506.png?dl=0" alt="dQw4w9WgXcQ" /></p>
|
||||
|
||||
<p>I like rickrolling people myself too, especially if they’re trying to delete my entire <code class="highlighter-rouge">/home</code> directory or, even worse, <code class="highlighter-rouge">/</code>. Since I learned how to use the <code class="highlighter-rouge">alias</code> built-in, I wanted a way to prevent that random people tinkering with my laptop (that I may forgot to lock) could delete potentially important stuff, just for fun or boredom.</p>
|
||||
|
||||
<p>The method that I’ll show will lock any <code class="highlighter-rouge">rm</code> command runned in both recursive and force mode, so <code class="highlighter-rouge">rm -rf</code>, <code class="highlighter-rouge">rm -f -r</code> and <code class="highlighter-rouge">rm -r --force</code> are all blocked, even if they are launched by <code class="highlighter-rouge">sudo</code>. I’m going to alias the rm command in <code class="highlighter-rouge">/etc/profile</code> <code class="highlighter-rouge">/etc/bash.bashrc</code> and in <code class="highlighter-rouge">/etc/zsh/zshrc</code> (I’m a zsh user) so that the rickroll will be possible from all users, even root and the ones with a brand new <code class="highlighter-rouge">bashrc</code> or <code class="highlighter-rouge">zshrc</code>. Here is the code I appended to those files:</p>
|
||||
|
||||
<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="nb">alias </span><span class="nv">rm</span><span class="o">=</span>/bin/rmAlias
|
||||
<span class="nb">alias </span><span class="nv">sudo</span><span class="o">=</span><span class="s1">'sudo '</span> <span class="c"># this enables aliases in sudo, see http://askubuntu.com/questions/22037/aliases-not-available-when-using-sudo</span></code></pre></figure>
|
||||
|
||||
<p>Since <code class="highlighter-rouge">alias</code> is not able to control flags of the aliases (see <a href="http://apple.stackexchange.com/questions/50963/how-do-i-add-a-flag-to-an-alias">here</a>), we’re going to redirect each call of <code class="highlighter-rouge">rm</code> to <code class="highlighter-rouge">/bin/rmAlias</code>, that would run the command if it’s safe. I didn’t use a function because it’s a bit tricky to make that work with <code class="highlighter-rouge">sudo</code>. So, let’s see the code I put in <code class="highlighter-rouge">rmAlias</code>:</p>
|
||||
|
||||
<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="c">#! /bin/bash</span>
|
||||
<span class="c"># Rickroll whoever tries to desert this system, even root.</span>
|
||||
<span class="c"># To achieve this, set the appropriate aliases even in /etc/profile and similars.</span>
|
||||
|
||||
<span class="c"># Video played when rickrolling</span>
|
||||
<span class="nv">ROLLVIDEO</span><span class="o">=</span>/opt/anti-rm/serious-video.mkv <span class="c"># it's just Never Gonna Give You Up on my system, but be free to customize this!</span>
|
||||
|
||||
rickroll<span class="o">(){</span>
|
||||
<span class="nb">echo</span> <span class="s2">"Never gonna desert this system..."</span>
|
||||
xdg-open <span class="nv">$ROLLVIDEO</span> 2>&1 &
|
||||
<span class="nb">exit </span>0
|
||||
<span class="o">}</span>
|
||||
|
||||
<span class="k">while </span><span class="nb">getopts</span> <span class="s2">":rf-"</span> opt; <span class="k">do</span>
|
||||
<span class="c"># Prevent '--force' to be detected as -r and -f</span>
|
||||
<span class="k">if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"-"</span> <span class="o">]</span>; <span class="k">then
|
||||
</span><span class="nv">OPTIND</span><span class="o">=</span><span class="nv">$OPTIND</span>+1
|
||||
<span class="k">continue
|
||||
fi
|
||||
if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"r"</span> <span class="o">]</span> <span class="o">||</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"f"</span> <span class="o">]</span>; <span class="k">then
|
||||
if</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">""</span> <span class="o">]</span>; <span class="k">then
|
||||
</span><span class="nv">tmp</span><span class="o">=</span><span class="nv">$opt</span>
|
||||
<span class="k">continue
|
||||
elif</span> <span class="o">[</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> !<span class="o">=</span> <span class="s2">"</span><span class="nv">$opt</span><span class="s2">"</span> <span class="o">]</span>; <span class="k">then
|
||||
</span>rickroll
|
||||
<span class="k">fi
|
||||
fi
|
||||
done
|
||||
|
||||
for </span>var <span class="k">in</span> <span class="s2">"</span><span class="nv">$@</span><span class="s2">"</span>
|
||||
<span class="k">do
|
||||
if</span> <span class="o">[[</span> <span class="s2">"</span><span class="nv">$var</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"--force"</span> <span class="o">&&</span> <span class="s2">"</span><span class="nv">$tmp</span><span class="s2">"</span> <span class="o">=</span> <span class="s2">"r"</span> <span class="o">]]</span>; <span class="k">then
|
||||
</span>rickroll
|
||||
<span class="k">fi
|
||||
done</span>
|
||||
|
||||
<span class="c"># If it's safe, just run rm</span>
|
||||
/bin/rm <span class="s2">"</span><span class="nv">$@</span><span class="s2">"</span>
|
||||
<span class="nb">exit</span> <span class="nv">$?</span></code></pre></figure>
|
||||
|
||||
<p>It may look messy to a UNIX guy more experienced than me, but it works. The <code class="highlighter-rouge">getopts</code> built-in sees if both the <code class="highlighter-rouge">-r</code> and the <code class="highlighter-rouge">-f</code> flags are used and, if so, it starts <code class="highlighter-rouge">rickroll()</code>, which opens with <code class="highlighter-rouge">xdg-open</code> that amazing clip from RickAstleyVEVO. From line 30 and below, the script checks if the <code class="highlighter-rouge">--force</code> flag is used instead of <code class="highlighter-rouge">-f</code>.</p>
|
||||
|
||||
<p>Give execute permissions to the script we’ve just created:</p>
|
||||
|
||||
<figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="c"># chmod +x /bin/rmAlias</span></code></pre></figure>
|
||||
|
||||
<p>Restart your shell, and enjoy. If you want to test safely, I suggest trying to run <code class="highlighter-rouge">rm -rf</code> with no folders or one nonexistant, since this script stop even these commands.</p>
|
||||
|
||||
<p>If you want even more security, you can rename this script to <code class="highlighter-rouge">/bin/rm</code> and move the original one in some other place, getting rid of all the aliases. I prefer the solution above because it’s tidier: you haven’t to move anything. In fact, this could be just an AUR package…</p>
|
||||
|
||||
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|
||||
|
||||
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My <a href="http://www.burarco.it/">Archery club</a>.
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<p>Things which an Arch Linux user that also owns an recurve bow can write.
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