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