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<!doctype html><html lang=en-us dir=ltr><head><meta charset=utf-8><meta name=viewport content='width=device-width,initial-scale=1'><meta name=description content="Nix is a declarative package manager (and its main language) that allows for reproducible environments (i.e., files in a folder).\nOne of the cool things about nix is that you can use it to run a package without installing it permanently in your system. For instance, I recently needed the readelf utility and it wasn&rsquo;t installed in my system, so I ran:\n1 nix run 'nixpkgs#toybox' -- readelf -l /home/j/.local/share/uv/python/cpython-3.10.11-linux-x86_64-gnu/bin/python | grep interpreter That&rsquo;s it. No need to deal with dependencies, incompatibilities, or to uninstall the package once you no longer need it.\n"><title>NixOS and Home Manager</title><link rel=canonical href=https://balkian.com/p/nixos-and-home-manager/><link rel=stylesheet href=/scss/style.min.314a81d1fef50606da5df138ce819c12f9ed0c4f2487c1964bccb4c3cc737879.css><meta property='og:title' content="NixOS and Home Manager"><meta property='og:description' content="Nix is a declarative package manager (and its main language) that allows for reproducible environments (i.e., files in a folder).\nOne of the cool things about nix is that you can use it to run a package without installing it permanently in your system. For instance, I recently needed the readelf utility and it wasn&rsquo;t installed in my system, so I ran:\n1 nix run 'nixpkgs#toybox' -- readelf -l /home/j/.local/share/uv/python/cpython-3.10.11-linux-x86_64-gnu/bin/python | grep interpreter That&rsquo;s it. No need to deal with dependencies, incompatibilities, or to uninstall the package once you no longer need it.\n"><meta property='og:url' content='https://balkian.com/p/nixos-and-home-manager/'><meta property='og:site_name' content='J. Fernando Sánchez'><meta property='og:type' content='article'><meta property='article:section' content='Post'><meta property='article:published_time' content='2025-08-31T18:53:25+02:00'><meta property='article:modified_time' content='2025-08-31T18:53:25+02:00'><meta property='og:image' content='https://balkian.com/img/nixos.svg'><meta name=twitter:title content="NixOS and Home Manager"><meta name=twitter:description content="Nix is a declarative package manager (and its main language) that allows for reproducible environments (i.e., files in a folder).\nOne of the cool things about nix is that you can use it to run a package without installing it permanently in your system. For instance, I recently needed the readelf utility and it wasn&rsquo;t installed in my system, so I ran:\n1 nix run 'nixpkgs#toybox' -- readelf -l /home/j/.local/share/uv/python/cpython-3.10.11-linux-x86_64-gnu/bin/python | grep interpreter That&rsquo;s it. No need to deal with dependencies, incompatibilities, or to uninstall the package once you no longer need it.\n"><meta name=twitter:card content="summary_large_image"><meta name=twitter:image content='https://balkian.com/img/nixos.svg'><link rel="shortcut icon" href=/img/favicon.ico></head><body class=article-page><script>(function(){const e="StackColorScheme";localStorage.getItem(e)||localStorage.setItem(e,"auto")})()</script><script>(function(){const t="StackColorScheme",e=localStorage.getItem(t),n=window.matchMedia("(prefers-color-scheme: dark)").matches===!0;e=="dark"||e==="auto"&&n?document.documentElement.dataset.scheme="dark":document.documentElement.dataset.scheme="light"})()</script><div class="container main-container flex on-phone--column extended"><aside class="sidebar left-sidebar sticky"><button class="hamburger hamburger--spin" type=button id=toggle-menu aria-label="Toggle Menu">
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<span>Dark Mode</span></li></ol></li></ol></aside><aside class="sidebar right-sidebar sticky"><section class="widget archives"><div class=widget-icon><svg class="icon icon-tabler icon-tabler-hash" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><line x1="5" y1="9" x2="19" y2="9"/><line x1="5" y1="15" x2="19" y2="15"/><line x1="11" y1="4" x2="7" y2="20"/><line x1="17" y1="4" x2="13" y2="20"/></svg></div><h2 class="widget-title section-title">Table of contents</h2><div class=widget--toc><nav id=TableOfContents><ol><li><a href=#context>Context</a></li><li><a href=#nixos>NixOS</a></li><li><a href=#home-manager>Home-Manager</a><ol><li><a href=#running-on-nixos>Running on NixOS</a></li><li><a href=#on-other-systems>On other systems</a></li></ol></li><li><a href=#its-a-little-flakey>It&rsquo;s a little flakey</a></li></ol></nav></div></section></aside><main class="main full-width"><article class="has-image main-article"><header class=article-header><div class=article-image><a href=/p/nixos-and-home-manager/><img src=/img/nixos.svg loading=lazy alt="Featured image of post NixOS and Home Manager"></a></div><div class=article-details><div class=article-title-wrapper><h2 class=article-title><a href=/p/nixos-and-home-manager/>NixOS and Home Manager</a></h2></div><footer class=article-time><div><svg class="icon icon-tabler icon-tabler-calendar-time" width="56" height="56" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><path d="M11.795 21H5a2 2 0 01-2-2V7a2 2 0 012-2h12a2 2 0 012 2v4"/><circle cx="18" cy="18" r="4"/><path d="M15 3v4"/><path d="M7 3v4"/><path d="M3 11h16"/><path d="M18 16.496V18l1 1"/></svg>
<time class=article-time--published>31 Aug 2025</time></div><div><svg class="icon icon-tabler icon-tabler-clock" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><circle cx="12" cy="12" r="9"/><polyline points="12 7 12 12 15 15"/></svg>
<time class=article-time--reading>4 minute read</time></div></footer></div></header><section class=article-content><p>Nix is a declarative package manager (and its main language) that allows for reproducible environments (i.e., files in a folder).</p><p>One of the cool things about nix is that you can use it to run a package without installing it permanently in your system.
For instance, I recently needed the <code>readelf</code> utility and it wasn&rsquo;t installed in my system, so I ran:</p><div class=highlight><div class=chroma><table class=lntable><tr><td class=lntd><pre tabindex=0 class=chroma><code><span class=lnt>1
</span></code></pre></td><td class=lntd><pre tabindex=0 class=chroma><code class=language-fallback data-lang=fallback><span class=line><span class=cl>nix run &#39;nixpkgs#toybox&#39; -- readelf -l /home/j/.local/share/uv/python/cpython-3.10.11-linux-x86_64-gnu/bin/python | grep interpreter
</span></span></code></pre></td></tr></table></div></div><p>That&rsquo;s it.
No need to deal with dependencies, incompatibilities, or to uninstall the package once you no longer need it.</p><p>NixOS is a Linux Operating system that uses this package manager and system configuration (e.g., users, network interfaces, etc.) defined in the Nix language to create reproducible systems.</p><p>Home-manager takes the concepts from NixOS to user-space, allowing you to define your personal environment (i.e., home).
It can be used on any system that supports the Nix package manager (e.g., Linux, Mac and Windows).</p><p>There is a lot to like</p><h2 id=context>Context</h2><p>(Last year)[https://github.com/balkian/dotfiles/commit/fa7041ff8bde6c5288ad55db6b0d61ed593bbccc] I started experimenting with nix and home-manager to configure my environments.
The context is that for some years now I&rsquo;ve been switching devices quite frequently.
It started when my main laptop died (DELL!!), I started using a desktop for most of my work, but I also needed a laptop to teach.
One thing led to another, and I ended up using vanilla Ubuntu or EndeavourOS installations with Gnome and very minimal customization.
That in itself is not wrong.
The thing is that, before that, I was a <a class=link href=https://github.com/balkian/dotfiles target=_blank rel=noopener>tinkerer with a customized environment</a>.</p><ol><li>I was being inefficient (and I felt it)</li><li>That inefficiency turned some easy things into a chore</li><li>This made work in general less enjoyable.</li><li>As a result, I became even less productive</li></ol><p>The idea was to get back to a usable terminal and editor setup with minimal</p><h2 id=nixos>NixOS</h2><p>I&rsquo;ve only been running NixOS for three days now, but so far I like the experience.
My approach is to keep the system definition as simple as possible, and rely on home-manager to install and configure most of my tools.
The basics would be:</p><ul><li>Network configuration</li><li>System users</li><li>Desktop environment (wayland and multiple DE&rsquo;s)</li></ul><p>All that goins into my <code>/etc/nixos/configuration.nix</code>, and then I do:</p><div class=highlight><div class=chroma><table class=lntable><tr><td class=lntd><pre tabindex=0 class=chroma><code><span class=lnt>1
</span></code></pre></td><td class=lntd><pre tabindex=0 class=chroma><code class=language-fallback data-lang=fallback><span class=line><span class=cl>sudo nixos-rebuild switch
</span></span></code></pre></td></tr></table></div></div><p>If it fails, nothing is changed in your system.
If it works, most of the changes will have been applied (e.g., new services started, others stopped).
The previous configuration does not disappear: you can roll back to it manually or when booting your system.</p><h2 id=home-manager>Home-Manager</h2><p>Here&rsquo;s where most of my configuration lives.
I use <code>homeConfigurations</code> to keep more than one configuration in the same repo (e.g., work (<code>j@lenny</code>) and personal computers (<code>j</code>, on any other system)).</p><p>To make it easier to install this configuration</p><h3 id=running-on-nixos>Running on NixOS</h3><p>There are two ways to run it: as part of your general configuration (i.e., it will be applied using the same <code>nixos-rebuild</code> command) or standalone.
I prefer the latter, because it allows me to tinker with the configuration more easily, and it is no different from applying it on other systems (see below).
After you change your config, simply run:</p><div class=highlight><div class=chroma><table class=lntable><tr><td class=lntd><pre tabindex=0 class=chroma><code><span class=lnt>1
</span></code></pre></td><td class=lntd><pre tabindex=0 class=chroma><code class=language-fallback data-lang=fallback><span class=line><span class=cl>home-manager switch
</span></span></code></pre></td></tr></table></div></div><h3 id=on-other-systems>On other systems</h3><p>Running nix on other operating systems (e.g., Arch Linux) is similar to a standalone installation on NixOS.
The only difference is that you need to <a class=link href=https://nix.dev/install-nix.html target=_blank rel=noopener>install nix first</a> and <a class=link href=https://nix-community.github.io/home-manager/index.xhtml#sec-install-standalone target=_blank rel=noopener>configure the appropriate channels</a>.</p><h2 id=its-a-little-flakey>It&rsquo;s a little flakey</h2><p>Flakes are an experimental feature of nix that use version control and some special conventions to bring more reproducibility guarantees.
For instance, they make it trivial to install a specific commit version of my home-manager config, which in itself could use program definitions from external git repositories.
Flakes are not the only solution to this problem, and they are a bit controversial among hardcore nix users.
However, the community as a whole seems to have embraced flakes.</p><p>I personally chose to set up my config as a flake.
I still have not tried to install it on other systems, so time will tell.</p></section><footer class=article-footer><section class=article-copyright><svg class="icon icon-tabler icon-tabler-copyright" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><circle cx="12" cy="12" r="9"/><path d="M14.5 9a3.5 4 0 100 6"/></svg>
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