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nixpkgs/nixos/doc/manual/development/building-nixos.xml
Emmanuel Rosa 4bee34dcc5
doc: clarify building-nixos CD/DVD instructions
This change updates the instructions for building a NixOS ISO so that it's clear how to do it.

Previously, the instructions stated to set NIXOS_CONFIG prior to running `nix-build`, yet the example provided by-passed NIXOS_CONFIG anyway. But the *really* important missing piece is the need for nixos/default.nix. See #21840.

This change removes the NIXOS_CONFIG verbiage, and adds steps to clone nixpkgs and (most importantly) cd'ing into nixpkgs/nixos. That way, the reader may think: *Oh, so I need a default.nix and a configuration.nix. Ahhh, OK.*

I purposely added the redundant default.nix argument.
2017-06-02 21:13:19 -04:00

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XML

<chapter xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-building-cd">
<title>Building Your Own NixOS CD</title>
<para>Building a NixOS CD is as easy as configuring your own computer. The
idea is to use another module which will replace
your <filename>configuration.nix</filename> to configure the system that
would be installed on the CD.</para>
<para>Default CD/DVD configurations are available
inside <filename>nixos/modules/installer/cd-dvd</filename>.
<screen>
$ git clone https://github.com/NixOS/nixpkgs.git
$ cd nixpkgs/nixos
$ nix-build -A config.system.build.isoImage -I nixos-config=modules/installer/cd-dvd/installation-cd-minimal.nix default.nix</screen>
</para>
<para>Before burning your CD/DVD, you can check the content of the image by mounting anywhere like
suggested by the following command:
<screen>
# mount -o loop -t iso9660 ./result/iso/cd.iso /mnt/iso</screen>
</para>
</chapter>