nixpkgs/nixos/doc/manual/development/testing-installer.xml

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<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="ch-testing-installer">
<title>Testing the Installer</title>
<para>Building, burning, and booting from an installation CD is rather
tedious, so here is a quick way to see if the installer works
properly:
<screen>
$ nix-build -A config.system.build.nixos-install
$ mount -t tmpfs none /mnt
$ ./result/bin/nixos-install</screen>
To start a login shell in the new NixOS installation in
<filename>/mnt</filename>:
<screen>
$ ./result/bin/nixos-install --chroot
</screen>
</para>
</chapter>