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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 the latest release. While it is
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trivial to change this to nixos-unstable 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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<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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