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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>Each NixOS host follows one channel. But many times it is useful to get packages
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or modules from different channels.</p>
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<h2 id="packages"><a class="header" href="#packages">Packages</a></h2>
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<p>You can make use of <code>overlays/overrides.nix</code> to override specific packages in the
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default channel to be pulled from other channels. That file is simply an example
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of how any overlay can get <code>channels</code> as their first argument.</p>
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<p>You can add overlays to any channel to override packages from other channels.</p>
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<p>Pulling the manix package from the <code>latest</code> channel:</p>
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<pre><code class="language-nix">channels: final: prev: {
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__dontExport = true;
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inherit (pkgs.latest) manix;
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}
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</code></pre>
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<p>It is recommended to set the <code>__dontExport</code> property for override specific
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overlays. <code>overlays/overrides.nix</code> is the best place to consolidate all package
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overrides and the property is already set for you.</p>
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<h2 id="modules"><a class="header" href="#modules">Modules</a></h2>
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<p>You can also pull modules from other channels. All modules have access to the
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<code>modulesPath</code> for each channel as <code><channelName>ModulesPath</code>. And you can use
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<code>disabledModules</code> to remove modules from the current channel.</p>
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<p>To pull zsh module from the <code>latest</code> channel this code can be placed in any module, whether its your host file, a profile, or a module in ./modules etc:</p>
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<pre><code class="language-nix">{ latestModulesPath }:
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{
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imports = [ "${latestModulesPath}/programs/zsh/zsh.nix" ];
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disabledModules = [ "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.</p>
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</blockquote>
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