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‘nixos-rebuild dry-activate’ builds the new configuration and then prints what systemd services would be stopped, restarted etc. if the configuration were actually activated. This could be extended later to show other activation actions (like uids being deleted). To prevent confusion, ‘nixos-rebuild dry-run’ has been renamed to ‘nixos-rebuild dry-build’.
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.