services: Add 'nix-service-type'.

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

1 files changed, 41 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index a9cd66ce87..83981b50d2 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -24197,6 +24197,47 @@ setuid-root (@pxref{Setuid Programs}) such that unprivileged users can invoke
 @command{singularity run} and similar commands.
 @end defvr
 
+@cindex Nix
+@subsubheading Nix service
+
+The @code{(gnu services nix)} module provides the following service.
+
+@defvr {Scheme Variable} nix-service-type
+
+This is the type of the service that runs 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
+  ;; @dots{}
+  (packages (append (list nix)
+                    %base-packages))
+
+  (services (append (list (service nix-service-type))
+                    %base-services)))
+@end example
+
+After @command{guix system reconfigure} configure Nix for your user:
+
+@itemize
+@item Add a Nix channel and update it.  See @url{https://nixos.org/nix/manual/,
+Nix Package Manager Guide}.
+
+@item Create a symlink to your profile and activate Nix profile:
+@end itemize
+
+@example
+$ ln -s "/nix/var/nix/profiles/per-user/$USER/profile" ~/.nix-profile
+$ source /run/current-system/profile/etc/profile.d/nix.sh
+@end example
+
+@end defvr
+
 @node Setuid Programs
 @section Setuid Programs