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<a href="#nixpkgshostplatform" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.hostPlatform
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.hostPlatform">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_6" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_4" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgslocalsystem" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.localSystem
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.localSystem">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_7" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_5" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgsoverlays" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.overlays
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.overlays">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_8" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_6" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgspkgs" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.pkgs
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.pkgs">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_9" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_7" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgssystem" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.system
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.system">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_10" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_8" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../oci/" class="md-nav__link">
<span class="md-ellipsis">
Oci
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../openstack/" class="md-nav__link">
<span class="md-ellipsis">
Openstack
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../power/" class="md-nav__link">
<span class="md-ellipsis">
Power
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../powerManagement/" class="md-nav__link">
<span class="md-ellipsis">
powerManagement
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../qt/" class="md-nav__link">
<span class="md-ellipsis">
Qt
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../specialisation/" class="md-nav__link">
<span class="md-ellipsis">
Specialisation
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../swapDevices/" class="md-nav__link">
<span class="md-ellipsis">
swapDevices
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../system/" class="md-nav__link">
<span class="md-ellipsis">
System
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../time/" class="md-nav__link">
<span class="md-ellipsis">
Time
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../xdg/" class="md-nav__link">
<span class="md-ellipsis">
Xdg
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../zramSwap/" class="md-nav__link">
<span class="md-ellipsis">
zramSwap
</span>
</a>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../boot/" class="md-nav__link">
<span class="md-ellipsis">
Boot
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../networking/" class="md-nav__link">
<span class="md-ellipsis">
Networking
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../programs/_1password-gui/" class="md-nav__link">
<span class="md-ellipsis">
Programs
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../security/" class="md-nav__link">
<span class="md-ellipsis">
Security
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../services/" class="md-nav__link">
<span class="md-ellipsis">
Services
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../systemd/" class="md-nav__link">
<span class="md-ellipsis">
Systemd
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../users/" class="md-nav__link">
<span class="md-ellipsis">
Users
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../virtualisation/" class="md-nav__link">
<span class="md-ellipsis">
Virtualisation
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
<a href="../../Nixpkgs/" class="md-nav__link">
<span class="md-ellipsis">
Nixpkgs
</span>
<span class="md-nav__icon md-icon"></span>
</a>
</li>
</ul>
</nav>
</div>
</div>
</div>
<div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" >
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
<label class="md-nav__title" for="__toc">
<span class="md-nav__icon md-icon"></span>
Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#nixpkgsflakesetflakeregistry" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.flake.setFlakeRegistry
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.flake.setFlakeRegistry">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgsflakesetnixpath" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.flake.setNixPath
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.flake.setNixPath">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_1" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgsflakesource" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.flake.source
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.flake.source">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_2" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgsbuildplatform" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.buildPlatform
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.buildPlatform">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_3" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_1" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgsconfig" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.config
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.config">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_4" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_2" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgscrosssystem" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.crossSystem
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.crossSystem">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_5" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_3" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgshostplatform" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.hostPlatform
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.hostPlatform">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_6" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_4" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgslocalsystem" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.localSystem
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.localSystem">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_7" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_5" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgsoverlays" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.overlays
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.overlays">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_8" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_6" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgspkgs" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.pkgs
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.pkgs">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_9" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_7" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#nixpkgssystem" class="md-nav__link">
<span class="md-ellipsis">
nixpkgs.system
</span>
</a>
<nav class="md-nav" aria-label="nixpkgs.system">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#default_10" class="md-nav__link">
<span class="md-ellipsis">
Default
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#example_8" class="md-nav__link">
<span class="md-ellipsis">
Example
</span>
</a>
</li>
</ul>
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</li>
</ul>
</nav>
</div>
</div>
</div>
<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
<h1>Nixpkgs</h1>
<p>Nixpkgs</p>
<h2 id="nixpkgsflakesetflakeregistry" nixpkgs-flake-setFlakeRegistry="nixpkgs-flake-setFlakeRegistry"><code>nixpkgs.flake.setFlakeRegistry</code></h2>
<p>Whether to pin nixpkgs in the system-wide flake registry (<code>/etc/nix/registry.json</code>) to the
store path of the sources of nixpkgs used to build the NixOS system.</p>
<p>This is on by default for NixOS configurations built with flakes.</p>
<p>This option makes {command}<code>nix run nixpkgs#hello</code> reuse dependencies from the system, avoid
refetching nixpkgs, and have a consistent result every time.</p>
<p>Note that this option makes the NixOS closure depend on the nixpkgs sources, which may add
undesired closure size if the system will not have any nix commands run on it.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default" nixpkgs-flake-setFlakeRegistry-default="nixpkgs-flake-setFlakeRegistry-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;config.nixpkgs.flake.source != null&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs-flake.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs-flake.nix</a></p>
<h2 id="nixpkgsflakesetnixpath" nixpkgs-flake-setNixPath="nixpkgs-flake-setNixPath"><code>nixpkgs.flake.setNixPath</code></h2>
<p>Whether to set {env}<code>NIX_PATH</code> to include <code>nixpkgs=flake:nixpkgs</code> such that <code>&lt;nixpkgs&gt;</code>
lookups receive the version of nixpkgs that the system was built with, in concert with
{option}<code>nixpkgs.flake.setFlakeRegistry</code>.</p>
<p>This is on by default for NixOS configurations built with flakes.</p>
<p>This makes {command}<code>nix-build '&lt;nixpkgs&gt;' -A hello</code> work out of the box on flake systems.</p>
<p>Note that this option makes the NixOS closure depend on the nixpkgs sources, which may add
undesired closure size if the system will not have any nix commands run on it.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_1" nixpkgs-flake-setNixPath-default="nixpkgs-flake-setNixPath-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;config.nixpkgs.flake.source != null&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs-flake.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs-flake.nix</a></p>
<h2 id="nixpkgsflakesource" nixpkgs-flake-source="nixpkgs-flake-source"><code>nixpkgs.flake.source</code></h2>
<p>The path to the nixpkgs sources used to build the system. This is automatically set up to be
the store path of the nixpkgs flake used to build the system if using
<code>nixpkgs.lib.nixosSystem</code>, and is otherwise null by default.</p>
<p>This can also be optionally set if the NixOS system is not built with a flake but still uses
pinned sources: set this to the store path for the nixpkgs sources used to build the system,
as may be obtained by <code>builtins.fetchTarball</code>, for example.</p>
<p>Note: the name of the store path must be "source" due to
<a href="https://github.com/NixOS/nix/issues/7075">https://github.com/NixOS/nix/issues/7075</a>.</p>
<p><strong>Type:</strong> <code>null or string or path</code></p>
<h3 id="default_2" nixpkgs-flake-source-default="nixpkgs-flake-source-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;if (using nixpkgsFlake.lib.nixosSystem) then self.outPath else null&quot;</span></code></p>
<h3 id="example" nixpkgs-flake-source-example="nixpkgs-flake-source-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;builtins.fetchTarball { name = </span><span class="se">\&quot;</span><span class="s2">source</span><span class="se">\&quot;</span><span class="s2">; sha256 = </span><span class="se">\&quot;</span><span class="s2">sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=</span><span class="se">\&quot;</span><span class="s2">; url = </span><span class="se">\&quot;</span><span class="s2">https://github.com/nixos/nixpkgs/archive/somecommit.tar.gz</span><span class="se">\&quot;</span><span class="s2">; }&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs-flake.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs-flake.nix</a></p>
<h2 id="nixpkgsbuildplatform" nixpkgs-buildPlatform="nixpkgs-buildPlatform"><code>nixpkgs.buildPlatform</code></h2>
<p>Specifies the platform on which NixOS should be built.
By default, NixOS is built on the system where it runs, but you can
change where it's built. Setting this option will cause NixOS to be
cross-compiled.</p>
<p>For instance, if you're doing distributed multi-platform deployment,
or if you're building machines, you can set this to match your
development system and/or build farm.</p>
<p>Ignored when <code>nixpkgs.pkgs</code> is set.</p>
<p><strong>Type:</strong> <code>string or (attribute set)</code></p>
<h3 id="default_3" nixpkgs-buildPlatform-default="nixpkgs-buildPlatform-default">Default</h3>
<p><code class="highlight">config<span class="o">.</span>nixpkgs<span class="o">.</span>hostPlatform</code></p>
<h3 id="example_1" nixpkgs-buildPlatform-example="nixpkgs-buildPlatform-example">Example</h3>
<p><code class="highlight"><span class="p">{</span><span class="ss">system</span> <span class="o">=</span> <span class="s2">&quot;x86_64-linux&quot;</span><span class="p">;</span><span class="p">}</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix</a></p>
<h2 id="nixpkgsconfig" nixpkgs-config="nixpkgs-config"><code>nixpkgs.config</code></h2>
<p>Global configuration for Nixpkgs.
The complete list of <a href="https://nixos.org/manual/nixpkgs/unstable/#sec-config-options-reference">Nixpkgs configuration options</a> is in the <a href="https://nixos.org/manual/nixpkgs/unstable/#chap-packageconfig">Nixpkgs manual section on global configuration</a>.</p>
<p>Ignored when {option}<code>nixpkgs.pkgs</code> is set.</p>
<p><strong>Type:</strong> <code>nixpkgs config</code></p>
<h3 id="default_4" nixpkgs-config-default="nixpkgs-config-default">Default</h3>
<p><code class="highlight"><span class="p">{</span> <span class="p">}</span></code></p>
<h3 id="example_2" nixpkgs-config-example="nixpkgs-config-example">Example</h3>
<p><code class="highlight"><span class="p">{</span> <span class="ss">allowBroken</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span> <span class="ss">allowUnfree</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span> <span class="p">}</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix</a></p>
<h2 id="nixpkgscrosssystem" nixpkgs-crossSystem="nixpkgs-crossSystem"><code>nixpkgs.crossSystem</code></h2>
<p>Systems with a recently generated <code>hardware-configuration.nix</code>
may instead specify <em>only</em> {option}<code>nixpkgs.buildPlatform</code>,
or fall back to removing the {option}<code>nixpkgs.hostPlatform</code> line from the generated config.</p>
<p>Specifies the platform for which NixOS should be
built. Specify this only if it is different from
<code>nixpkgs.localSystem</code>, the platform
<em>on</em> which NixOS should be built. In other
words, specify this to cross-compile NixOS. Otherwise it
should be set as null, the default. See its description in the
Nixpkgs manual for more details.</p>
<p>Ignored when <code>nixpkgs.pkgs</code> or <code>hostPlatform</code> is set.</p>
<p><strong>Type:</strong> <code>null or (attribute set)</code></p>
<h3 id="default_5" nixpkgs-crossSystem-default="nixpkgs-crossSystem-default">Default</h3>
<p><code class="highlight"><span class="no">null</span></code></p>
<h3 id="example_3" nixpkgs-crossSystem-example="nixpkgs-crossSystem-example">Example</h3>
<p><code class="highlight"><span class="p">{</span><span class="ss">system</span> <span class="o">=</span> <span class="s2">&quot;aarch64-linux&quot;</span><span class="p">;</span><span class="p">}</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix</a></p>
<h2 id="nixpkgshostplatform" nixpkgs-hostPlatform="nixpkgs-hostPlatform"><code>nixpkgs.hostPlatform</code></h2>
<p>Specifies the platform where the NixOS configuration will run.</p>
<p>To cross-compile, set also <code>nixpkgs.buildPlatform</code>.</p>
<p>Ignored when <code>nixpkgs.pkgs</code> is set.</p>
<p><strong>Type:</strong> <code>string or (attribute set)</code></p>
<h3 id="default_6" nixpkgs-hostPlatform-default="nixpkgs-hostPlatform-default">Default</h3>
<p><code class="highlight"><span class="p">(</span><span class="nb">import</span> <span class="s2">&quot;</span><span class="si">${</span>nixos<span class="si">}</span><span class="s2">/../lib&quot;</span><span class="p">)</span><span class="o">.</span>lib<span class="o">.</span>systems<span class="o">.</span>examples<span class="o">.</span>aarch64-multiplatform</code></p>
<h3 id="example_4" nixpkgs-hostPlatform-example="nixpkgs-hostPlatform-example">Example</h3>
<p><code class="highlight"><span class="p">{</span><span class="ss">system</span> <span class="o">=</span> <span class="s2">&quot;aarch64-linux&quot;</span><span class="p">;</span><span class="p">}</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix</a></p>
<h2 id="nixpkgslocalsystem" nixpkgs-localSystem="nixpkgs-localSystem"><code>nixpkgs.localSystem</code></h2>
<p>Systems with a recently generated <code>hardware-configuration.nix</code>
do not need to specify this option, unless cross-compiling, in which case
you should set <em>only</em> {option}<code>nixpkgs.buildPlatform</code>.</p>
<p>If this is somehow not feasible, you may fall back to removing the
{option}<code>nixpkgs.hostPlatform</code> line from the generated config and
use the old options.</p>
<p>Specifies the platform on which NixOS should be built. When
<code>nixpkgs.crossSystem</code> is unset, it also specifies
the platform <em>for</em> which NixOS should be
built. If this option is unset, it defaults to the platform
type of the machine where evaluation happens. Specifying this
option is useful when doing distributed multi-platform
deployment, or when building virtual machines. See its
description in the Nixpkgs manual for more details.</p>
<p>Ignored when <code>nixpkgs.pkgs</code> or <code>hostPlatform</code> is set.</p>
<p><strong>Type:</strong> <code>attribute set</code></p>
<h3 id="default_7" nixpkgs-localSystem-default="nixpkgs-localSystem-default">Default</h3>
<p><code class="highlight"><span class="p">(</span><span class="nb">import</span> <span class="s2">&quot;</span><span class="si">${</span>nixos<span class="si">}</span><span class="s2">/../lib&quot;</span><span class="p">)</span><span class="o">.</span>lib<span class="o">.</span>systems<span class="o">.</span>examples<span class="o">.</span>aarch64-multiplatform</code></p>
<h3 id="example_5" nixpkgs-localSystem-example="nixpkgs-localSystem-example">Example</h3>
<p><code class="highlight"><span class="p">{</span><span class="ss">system</span> <span class="o">=</span> <span class="s2">&quot;aarch64-linux&quot;</span><span class="p">;</span><span class="p">}</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix</a></p>
<h2 id="nixpkgsoverlays" nixpkgs-overlays="nixpkgs-overlays"><code>nixpkgs.overlays</code></h2>
<p>List of overlays to apply to Nixpkgs.
This option allows modifying the Nixpkgs package set accessed through the <code>pkgs</code> module argument.</p>
<p>For details, see the <a href="https://nixos.org/manual/nixpkgs/stable/#chap-overlays">Overlays chapter in the Nixpkgs manual</a>.</p>
<p>If the {option}<code>nixpkgs.pkgs</code> option is set, overlays specified using <code>nixpkgs.overlays</code> will be applied after the overlays that were already included in <code>nixpkgs.pkgs</code>.</p>
<p><strong>Type:</strong> <code>list of (nixpkgs overlay)</code></p>
<h3 id="default_8" nixpkgs-overlays-default="nixpkgs-overlays-default">Default</h3>
<p><code class="highlight"><span class="p">[</span> <span class="p">]</span></code></p>
<h3 id="example_6" nixpkgs-overlays-example="nixpkgs-overlays-example">Example</h3>
<p><code class="highlight"><span class="p">[</span><span class="p">(</span>self<span class="p">:</span> super<span class="p">:</span> <span class="p">{</span><span class="ss">openssh</span> <span class="o">=</span> super<span class="o">.</span>openssh<span class="o">.</span>override <span class="p">{</span><span class="ss">hpnSupport</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span><span class="ss">kerberos</span> <span class="o">=</span> self<span class="o">.</span>libkrb5<span class="p">;</span><span class="p">};</span><span class="p">})</span><span class="p">]</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix</a></p>
<h2 id="nixpkgspkgs" nixpkgs-pkgs="nixpkgs-pkgs"><code>nixpkgs.pkgs</code></h2>
<p>If set, the pkgs argument to all NixOS modules is the value of
this option, extended with <code>nixpkgs.overlays</code>, if
that is also set. Either <code>nixpkgs.crossSystem</code> or
<code>nixpkgs.localSystem</code> will be used in an assertion
to check that the NixOS and Nixpkgs architectures match. Any
other options in <code>nixpkgs.*</code>, notably <code>config</code>,
will be ignored.</p>
<p>If unset, the pkgs argument to all NixOS modules is determined
as shown in the default value for this option.</p>
<p>The default value imports the Nixpkgs source files
relative to the location of this NixOS module, because
NixOS and Nixpkgs are distributed together for consistency,
so the <code>nixos</code> in the default value is in fact a
relative path. The <code>config</code>, <code>overlays</code>,
<code>localSystem</code>, and <code>crossSystem</code> come
from this option's siblings.</p>
<p>This option can be used by applications like NixOps to increase
the performance of evaluation, or to create packages that depend
on a container that should be built with the exact same evaluation
of Nixpkgs, for example. Applications like this should set
their default value using <code>lib.mkDefault</code>, so
user-provided configuration can override it without using
<code>lib</code>.</p>
<p>Note that using a distinct version of Nixpkgs with NixOS may
be an unexpected source of problems. Use this option with care.</p>
<p><strong>Type:</strong> <code>An evaluation of Nixpkgs; the top level attribute set of packages</code></p>
<h3 id="default_9" nixpkgs-pkgs-default="nixpkgs-pkgs-default">Default</h3>
<p><code class="highlight"><span class="nb">import</span> <span class="s2">&quot;</span><span class="si">${</span>nixos<span class="si">}</span><span class="s2">/..&quot;</span> <span class="p">{</span><span class="k">inherit</span> <span class="p">(</span>cfg<span class="p">)</span> config overlays localSystem crossSystem<span class="p">;</span><span class="p">}</span></code></p>
<h3 id="example_7" nixpkgs-pkgs-example="nixpkgs-pkgs-example">Example</h3>
<p><code class="highlight"><span class="nb">import</span> <span class="l">&lt;nixpkgs&gt;</span> <span class="p">{}</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix</a></p>
<h2 id="nixpkgssystem" nixpkgs-system="nixpkgs-system"><code>nixpkgs.system</code></h2>
<p>This option does not need to be specified for NixOS configurations
with a recently generated <code>hardware-configuration.nix</code>.</p>
<p>Specifies the Nix platform type on which NixOS should be built.
It is better to specify <code>nixpkgs.localSystem</code> instead.
<div class="highlight"><pre><span></span><code>{
nixpkgs.system = ..;
}
</code></pre></div>
is the same as
<div class="highlight"><pre><span></span><code>{
nixpkgs.localSystem.system = ..;
}
</code></pre></div>
See <code>nixpkgs.localSystem</code> for more information.</p>
<p>Ignored when <code>nixpkgs.pkgs</code>, <code>nixpkgs.localSystem</code> or <code>nixpkgs.hostPlatform</code> is set.</p>
<p><strong>Type:</strong> <code>string</code></p>
<h3 id="default_10" nixpkgs-system-default="nixpkgs-system-default">Default</h3>
<p>Traditionally <code>builtins.currentSystem</code>, but unset when invoking NixOS through <code>lib.nixosSystem</code>.</p>
<h3 id="example_8" nixpkgs-system-example="nixpkgs-system-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;i686-linux&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/misc/nixpkgs.nix</a></p>
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