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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Oleg Pykhalov <go.wigust@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu services nix)
+ #:use-module (gnu packages admin)
+ #:use-module (gnu packages package-management)
+ #:use-module (gnu services base)
+ #:use-module (gnu services configuration)
+ #:use-module (gnu services shepherd)
+ #:use-module (gnu services web)
+ #:use-module (gnu services)
+ #:use-module (gnu system shadow)
+ #:use-module (guix gexp)
+ #:use-module (guix packages)
+ #:use-module (guix records)
+ #:use-module (guix store)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:export (nix-service-type))
+
+;;; Commentary:
+;;;
+;;; This module provides a service definition for the Nix daemon.
+;;;
+;;; Code:
+
+
+;;;
+;;; Accounts
+;;;
+
+;; Copied from gnu/services/base.scm
+(define* (nix-build-accounts count #:key
+ (group "nixbld")
+ (shadow shadow))
+ "Return a list of COUNT user accounts for Nix build users with the given
+GID."
+ (unfold (cut > <> count)
+ (lambda (n)
+ (user-account
+ (name (format #f "nixbld~2,'0d" n))
+ (system? #t)
+ (group group)
+ (supplementary-groups (list group "kvm"))
+ (comment (format #f "Nix Build User ~2d" n))
+ (home-directory "/var/empty")
+ (shell (file-append shadow "/sbin/nologin"))))
+ 1+
+ 1))
+(define (nix-accounts _)
+ "Return the user accounts and user groups."
+ (cons (user-group
+ (name "nixbld")
+ (system? #t)
+
+ ;; Use a fixed GID so that we can create the store with the right
+ ;; owner.
+ (id 40000))
+ (nix-build-accounts 10 #:group "nixbld")))
+
+(define (nix-activation _)
+ "Return the activation gexp."
+ (with-imported-modules '((guix build utils))
+ #~(begin
+ (use-modules (guix build utils))
+ (for-each (cut mkdir-p <>) '("/nix/store" "/nix/var/log"
+ "/nix/var/nix/gcroots/per-user"
+ "/nix/var/nix/profiles/per-user"))
+ (chown "/nix/store"
+ (passwd:uid (getpw "root")) (group:gid (getpw "nixbld01")))
+ (chmod "/nix/store" #o775)
+ (for-each (cut chmod <> #o777) '("/nix/var/nix/profiles"
+ "/nix/var/nix/profiles/per-user")))))
+
+(define (nix-shepherd-service _)
+ "Return a <shepherd-service> for Nix."
+ (list
+ (shepherd-service
+ (provision '(nix-daemon))
+ (documentation "Run nix-daemon.")
+ (requirement '())
+ (start #~(make-forkexec-constructor
+ (list (string-append #$nix "/bin/nix-daemon"))))
+ (respawn? #f)
+ (stop #~(make-kill-destructor)))))
+
+(define nix-service-type
+ (service-type
+ (name 'nix)
+ (extensions
+ (list (service-extension shepherd-root-service-type nix-shepherd-service)
+ (service-extension account-service-type nix-accounts)
+ (service-extension activation-service-type nix-activation)))
+ (default-value '())
+ (description "Run the Nix daemon.")))
+
+;;; nix.scm ends here