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-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-fhs-environments">
- <title>buildFHSUserEnv</title>
-
- <para>
-  <function>buildFHSUserEnv</function> provides a way to build and run FHS-compatible lightweight sandboxes. It creates an isolated root with bound <filename>/nix/store</filename>, so its footprint in terms of disk space needed is quite small. This allows one to run software which is hard or unfeasible to patch for NixOS -- 3rd-party source trees with FHS assumptions, games distributed as tarballs, software with integrity checking and/or external self-updated binaries. It uses Linux namespaces feature to create temporary lightweight environments which are destroyed after all child processes exit, without root user rights requirement. Accepted arguments are:
- </para>
-
- <variablelist>
-  <varlistentry>
-   <term>
-    <literal>name</literal>
-   </term>
-   <listitem>
-    <para>
-     Environment name.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>targetPkgs</literal>
-   </term>
-   <listitem>
-    <para>
-     Packages to be installed for the main host's architecture (i.e. x86_64 on x86_64 installations). Along with libraries binaries are also installed.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>multiPkgs</literal>
-   </term>
-   <listitem>
-    <para>
-     Packages to be installed for all architectures supported by a host (i.e. i686 and x86_64 on x86_64 installations). Only libraries are installed by default.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraBuildCommands</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional commands to be executed for finalizing the directory structure.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraBuildCommandsMulti</literal>
-   </term>
-   <listitem>
-    <para>
-     Like <literal>extraBuildCommands</literal>, but executed only on multilib architectures.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraOutputsToInstall</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional derivation outputs to be linked for both target and multi-architecture packages.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraInstallCommands</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional commands to be executed for finalizing the derivation with runner script.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>runScript</literal>
-   </term>
-   <listitem>
-    <para>
-     A command that would be executed inside the sandbox and passed all the command line arguments. It defaults to <literal>bash</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
- </variablelist>
-
- <para>
-  One can create a simple environment using a <literal>shell.nix</literal> like that:
- </para>
-
-<programlisting><![CDATA[
-{ pkgs ? import <nixpkgs> {} }:
-
-(pkgs.buildFHSUserEnv {
-  name = "simple-x11-env";
-  targetPkgs = pkgs: (with pkgs;
-    [ udev
-      alsaLib
-    ]) ++ (with pkgs.xorg;
-    [ libX11
-      libXcursor
-      libXrandr
-    ]);
-  multiPkgs = pkgs: (with pkgs;
-    [ udev
-      alsaLib
-    ]);
-  runScript = "bash";
-}).env
-]]></programlisting>
-
- <para>
-  Running <literal>nix-shell</literal> would then drop you into a shell with these libraries and binaries available. You can use this to run closed-source applications which expect FHS structure without hassles: simply change <literal>runScript</literal> to the application path, e.g. <filename>./bin/start.sh</filename> -- relative paths are supported.
- </para>
-</section>