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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Appendix B. NixOS Module Options</title><link rel="stylesheet" type="text/css" href="style.css" /><script src="highlight.min.js" type="text/javascript"></script><script src="highlight.load.js" type="text/javascript"></script><meta name="generator" content="DocBook XSL Stylesheets V1.79.2" /><link rel="home" href="index.html" title="Home Manager Manual" /><link rel="up" href="index.html" title="Home Manager Manual" /><link rel="prev" href="options.html" title="Appendix A. Configuration Options" /><link rel="next" href="nix-darwin-options.html" title="Appendix C. nix-darwin Module Options" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Appendix B. NixOS Module Options</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="options.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="nix-darwin-options.html">Next</a></td></tr></table><hr /></div><div class="appendix"><div class="titlepage"><div><div><h1 class="title"><a id="ch-nixos-options"></a>Appendix B. NixOS Module Options</h1></div></div></div><div class="variablelist"><a id="nixos-options"></a><dl class="variablelist"><dt><span class="term"><a id="nixos-opt-home-manager.backupFileExtension"></a><a class="term" href="nixos-options.html#nixos-opt-home-manager.backupFileExtension"><code class="option">home-manager.backupFileExtension</code></a></span></dt><dd><p>On activation move existing files by appending the given
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Appendix B. NixOS Module Options</title><link rel="stylesheet" type="text/css" href="style.css" /><script src="highlight.min.js" type="text/javascript"></script><script src="highlight.load.js" type="text/javascript"></script><meta name="generator" content="DocBook XSL Stylesheets V1.79.2" /><link rel="home" href="index.html" title="Home Manager Manual" /><link rel="up" href="index.html" title="Home Manager Manual" /><link rel="prev" href="options.html" title="Appendix A. Configuration Options" /><link rel="next" href="nix-darwin-options.html" title="Appendix C. nix-darwin Module Options" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Appendix B. NixOS Module Options</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="options.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="nix-darwin-options.html">Next</a></td></tr></table><hr /></div><div class="appendix"><div class="titlepage"><div><div><h1 class="title"><a id="ch-nixos-options"></a>Appendix B. NixOS Module Options</h1></div></div></div><div class="variablelist"><a id="nixos-options"></a><dl class="variablelist"><dt><span class="term"><a id="nixos-opt-_module.args"></a><a class="term" href="nixos-options.html#nixos-opt-_module.args"><code class="option">_module.args</code></a></span></dt><dd><p>Additional arguments passed to each module in addition to ones
like `lib`, `config`,
and `pkgs`, `modulesPath`.
This option is also available to all submodules. Submodules do not
inherit args from their parent module, nor do they provide args to
their parent module or sibling submodules. The sole exception to
this is the argument `name` which is provided by
parent modules to a submodule and contains the attribute name
the submodule is bound to, or a unique generated name if it is
not bound to an attribute.
Some arguments are already passed by default, of which the
following *cannot* be changed with this option:
- {var}`lib`: The nixpkgs library.
- {var}`config`: The results of all options after merging the values from all modules together.
- {var}`options`: The options declared in all modules.
- {var}`specialArgs`: The `specialArgs` argument passed to `evalModules`.
- All attributes of {var}`specialArgs`
Whereas option values can generally depend on other option values
thanks to laziness, this does not apply to `imports`, which
must be computed statically before anything else.
For this reason, callers of the module system can provide `specialArgs`
which are available during import resolution.
For NixOS, `specialArgs` includes
{var}`modulesPath`, which allows you to import
extra modules from the nixpkgs package tree without having to
somehow make the module aware of the location of the
`nixpkgs` or NixOS directories.
```
{ modulesPath, ... }: {
imports = [
(modulesPath + "/profiles/minimal.nix")
];
}
```
For NixOS, the default value for this option includes at least this argument:
- {var}`pkgs`: The nixpkgs package set according to
the {option}`nixpkgs.pkgs` option.</p><p><span class="emphasis"><em>Type:</em></span> lazy attribute set of raw value</p><p><span class="emphasis"><em>Declared by:</em></span></p><table border="0" summary="Simple list" class="simplelist"><tr><td><code class="filename"><a class="filename" href="https://github.com/nix-community/home-manager/blob/master/lib/modules.nix#blob-path" target="_top">
&lt;home-manager/lib/modules.nix&gt;
</a></code></td></tr></table></dd><dt><span class="term"><a id="nixos-opt-home-manager.backupFileExtension"></a><a class="term" href="nixos-options.html#nixos-opt-home-manager.backupFileExtension"><code class="option">home-manager.backupFileExtension</code></a></span></dt><dd><p>On activation move existing files by appending the given
file extension rather than exiting with an error.</p><p><span class="emphasis"><em>Type:</em></span> null or string</p><p><span class="emphasis"><em>Default:</em></span> <code class="literal">null</code></p><p><span class="emphasis"><em>Example:</em></span> <code class="literal">"backup"</code></p><p><span class="emphasis"><em>Declared by:</em></span></p><table border="0" summary="Simple list" class="simplelist"><tr><td><code class="filename"><a class="filename" href="https://github.com/nix-community/home-manager/blob/master/nixos/common.nix#blob-path" target="_top">
&lt;home-manager/nixos/common.nix&gt;
</a></code></td></tr></table></dd><dt><span class="term"><a id="nixos-opt-home-manager.extraSpecialArgs"></a><a class="term" href="nixos-options.html#nixos-opt-home-manager.extraSpecialArgs"><code class="option">home-manager.extraSpecialArgs</code></a></span></dt><dd><p>Extra <code class="literal">specialArgs</code> passed to Home Manager. This