doc: clarify building-nixos CD/DVD instructions #26341
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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.
Motivation for this change
Things done
(nix.useSandbox on NixOS,
or option
build-use-sandbox
innix.conf
on non-NixOS)
nix-shell -p nox --run "nox-review wip"
./result/bin/
)