[bug#35648] [PATCH] services: Add 'nix-service-type'.

["Ludovic Courtès" <ludo@gnu.org>]

Hi Oleg,

Oleg Pykhalov <go.wigust@gmail.com> skribis:

> * gnu/services/nix.scm: New file.
> * gnu/local.mk: Add this.
> * doc/guix.texi (Miscellaneous Services): Document this.

[...]

> +@defvr {Scheme Variable} nix-service-type
> +
> +This is the type of the service that runs @url{https://nixos.org/nix/, Nix}, a
> +daemon that is required to use the Nix package manager.

“… that runs the build daemon of the @url{https://nixos.org/nix, Nix}
package manager.  Here is an example showing how to use it:”

> +@example
> +(use-modules (gnu))
> +(use-service-modules nix)
> +(use-package-modules package-management)
> +
> +(operating-system

Add a line like:

  ;; @dots{}

> +  (packages (append (list nix)
> +                    %base-packages))
> +
> +  (services (append (list (service nix-service-type))
> +                    %base-services)))
> +@end example
> +
> +After @command{guix system reconfigure} you need to configure Nix for your
> +user, e.g.:
> +
> +@example
> +$ nix-channel --add https://nixos.org/channels/nixpkgs-unstable
> +$ nix-channel --update
> +$ ln -s "/nix/var/nix/profiles/per-user/$USER/profile" ~/.nix-profile
> +$ source /run/current-system/profile/etc/profile.d/nix.sh
> +$ nix-env --install hello
> +$ hello
> +@end example

Can we instead simply add a link to upstream documentation for this?  I
would feel more comfortable that way.

Otherwise LGTM, thanks!

Ludo’.