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docs: add NixOS module installation instructions

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Robert Helgesson 2019-02-26 22:32:18 +01:00
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doc/installation.xml
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@ -145,8 +145,86 @@ $HOME/.nix-profile/etc/profile.d/hm-session-vars.sh
<title>NixOS module</title>
<para>
To be done.
Home Manager provides a NixOS module that allows you to prepare user
environments directly from the system configuration file, which often is
more convenient than using the <command>home-manager</command> tool. It also
opens up additional possibilities, for example, to automatically configure
user environments in NixOS declarative containers or on systems deployed
through NixOps.
</para>
<para>
To make the NixOS module available for use you must <option>import</option>
it into your system configuration. This is most conveniently done by adding
a Home Manager channel, for example
</para>
<screen>
<prompt>#</prompt> <userinput>nix-channel --add https://github.com/rycee/home-manager/archive/master.tar.gz home-manager</userinput>
<prompt>#</prompt> <userinput>nix-channel --update</userinput>
</screen>
<para>
if you are following Nixpkgs master or an unstable channel and
</para>
<screen>
<prompt>#</prompt> <userinput>nix-channel --add https://github.com/rycee/home-manager/archive/release-18.09.tar.gz home-manager</userinput>
<prompt>#</prompt> <userinput>nix-channel --update</userinput>
</screen>
<para>
if you follow a Nixpkgs version 18.09 channel.
</para>
<para>
It is then possible to add
</para>
<programlisting language="nix">
imports = [ &lt;home-manager/nixos&gt; ];
</programlisting>
<para>
to your system <filename>configuration.nix</filename> file, which will
introduce a new NixOS option called <option>home-manager.users</option>
whose type is an attribute set that maps user names to Home Manager
configurations.
</para>
<para>
For example, a NixOS configuration may include the lines
</para>
<programlisting language="nix">
users.users.eve.isNormalUser = true;
home-manager.users.eve = { pkgs, ... }: {
home.packages = [ pkgs.atool pkgs.httpie ];
programs.bash.enable = true;
};
</programlisting>
<para>
and after a <command>nixos-rebuild switch</command> the user eve's
environment should include a basic Bash configuration and the packages atool
and httpie.
</para>
<note>
<para>
By default packages will be installed to
<filename>$HOME/.nix-profile</filename> but they can be installed to
<filename>/etc/profiles</filename> if
</para>
<programlisting language="nix">
home-manager.useUserPackages = true;
</programlisting>
<para>
is added to the system configuration. This is necessary if, for example,
you wish to use <command>nixos-rebuild build-vm</command>. This option may
become the default value in the future.
</para>
</note>
</section>
<section xml:id="sec-install-nix-darwin-module">
<title>nix-darwin module</title>