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<ol class="chapter"><li class="chapter-item expanded "><a href="../../index.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="../start/index.html"><strong aria-hidden="true">2.</strong> Quick Start</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../start/iso.html"><strong aria-hidden="true">2.1.</strong> ISO</a></li><li class="chapter-item expanded "><a href="../start/bootstrapping.html"><strong aria-hidden="true">2.2.</strong> Bootstrapping</a></li><li class="chapter-item expanded "><a href="../start/from-nixos.html"><strong aria-hidden="true">2.3.</strong> From NixOS</a></li></ol></li><li class="chapter-item expanded "><a href="../concepts/index.html"><strong aria-hidden="true">3.</strong> Key Concepts</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../concepts/extern.html"><strong aria-hidden="true">3.1.</strong> Extern</a></li><li class="chapter-item expanded "><a href="../concepts/hosts.html"><strong aria-hidden="true">3.2.</strong> Hosts</a></li><li class="chapter-item expanded "><a href="../concepts/overrides.html" class="active"><strong aria-hidden="true">3.3.</strong> Overrides</a></li><li class="chapter-item expanded "><a href="../concepts/profiles.html"><strong aria-hidden="true">3.4.</strong> Profiles</a></li><li class="chapter-item expanded "><a href="../concepts/suites.html"><strong aria-hidden="true">3.5.</strong> Suites</a></li><li class="chapter-item expanded "><a href="../concepts/users.html"><strong aria-hidden="true">3.6.</strong> Users</a></li></ol></li><li class="chapter-item expanded "><a href="../outputs/index.html"><strong aria-hidden="true">4.</strong> Outputs</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../outputs/modules.html"><strong aria-hidden="true">4.1.</strong> Modules</a></li><li class="chapter-item expanded "><a href="../outputs/overlays.html"><strong aria-hidden="true">4.2.</strong> Overlays</a></li><li class="chapter-item expanded "><a href="../outputs/pkgs.html"><strong aria-hidden="true">4.3.</strong> Packages</a></li></ol></li><li class="chapter-item expanded "><div><strong aria-hidden="true">5.</strong> Concerns</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../lib.html"><strong aria-hidden="true">5.1.</strong> Lib</a></li><li class="chapter-item expanded "><a href="../secrets.html"><strong aria-hidden="true">5.2.</strong> Secrets</a></li><li class="chapter-item expanded "><a href="../tests.html"><strong aria-hidden="true">5.3.</strong> Tests</a></li></ol></li><li class="chapter-item expanded "><a href="../flk/index.html"><strong aria-hidden="true">6.</strong> Helper Script – flk</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../flk/up.html"><strong aria-hidden="true">6.1.</strong> up</a></li><li class="chapter-item expanded "><a href="../flk/update.html"><strong aria-hidden="true">6.2.</strong> update</a></li><li class="chapter-item expanded "><a href="../flk/get.html"><strong aria-hidden="true">6.3.</strong> get</a></li><li class="chapter-item expanded "><a href="../flk/iso.html"><strong aria-hidden="true">6.4.</strong> iso</a></li><li class="chapter-item expanded "><a href="../flk/install.html"><strong aria-hidden="true">6.5.</strong> install</a></li><li class="chapter-item expanded "><a href="../flk/home.html"><strong aria-hidden="true">6.6.</strong> home</a></li></ol></li><li class="chapter-item expanded "><a href="../integrations/index.html"><strong aria-hidden="true">7.</strong> Integrations</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../integrations/cachix.html"><strong aria-hidden="true">7.1.</strong> Cachix</a></li><li class="chapter-item expanded "><a href="../integrations/deploy.html"><strong aria-hidden="true">7.2.</strong> Deploy RS</a></li><li class="chapter-item expanded "><a href="../integrations/hercules.html"><strong aria-hidden="true">7.3.</strong> Hercules CI</a></li></ol></li><li class="chapter-item expanded "><a href="../CONTRIBUTING.html"><strong aria-hidden="true">8.</strong> Contributing</a></li></ol>
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<main>
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<h1 id="overrides"><a class="header" href="#overrides">Overrides</a></h1>
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<p>By default, the NixOS systems are based on unstable. While it is trivial to
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change this to a stable release, or any other branch of nixpkgs by
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changing the flake url, sometimes all we want is a single package from another
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branch.</p>
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<p>This is what the overrides are for. By default, they are pulled directly from
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nixpkgs/master, but you can change the <code>override</code> flake input url to
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nixos-unstable, or even a specific sha revision.</p>
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<p>They are defined in the <code>extern/overrides.nix</code> file.</p>
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<h2 id="example"><a class="header" href="#example">Example</a></h2>
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<h3 id="packages"><a class="header" href="#packages">Packages</a></h3>
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<p>The override packages are defined as a regular overlay with an extra arguement
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<code>pkgs</code>. This refers to the packages built from the <code>override</code> flake.</p>
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<p>Pulling the manix package from the override flake:</p>
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<pre><code class="language-nix">{
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packages = pkgs: final: prev: {
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inherit (pkgs) manix;
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};
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}
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</code></pre>
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<h3 id="modules"><a class="header" href="#modules">Modules</a></h3>
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<p>You can also pull modules from override. Simply specify their path relative to
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the nixpkgs <a href="https://github.com/NixOS/nixpkgs/tree/master/nixos/modules">modules</a> directory. The old version will be added
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to <code>disabledModules</code> and the new version imported into the configuration.</p>
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<p>Pulling the zsh module from the override flake:</p>
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<pre><code class="language-nix">{
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modules = [ "programs/zsh/zsh.nix" ];
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}
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</code></pre>
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<blockquote>
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<h5 id="note"><a class="header" href="#note"><em>Note:</em></a></h5>
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<p>Sometimes a modules name will change from one branch to another. This is what
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the <code>disabledModules</code> list is for. If the module name changes, the old
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version will not automatically be disabled, so simply put it's old name in
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this list to disable it.</p>
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