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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019, 2020 Oleg Pykhalov <>
;;; Copyright © 2020 Peng Mei Yu <>
;;; 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
;;; 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 <>.
(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)
#:use-module (ice-9 match)
#:use-module (ice-9 format)
#:use-module (guix modules)
#:export (nix-service-type
;;; Commentary:
;;; This module provides a service definition for the Nix daemon.
;;; Code:
(define-record-type* <nix-configuration>
nix-configuration make-nix-configuration
(package nix-configuration-package ;package
(default nix))
(sandbox nix-configuration-sandbox ;boolean
(default #t))
(build-sandbox-items nix-configuration-build-sandbox-items ;list of strings
(default '()))
(extra-config nix-configuration-extra-config ;list of strings
(default '()))
(extra-options nix-configuration-extra-options ;list of strings
(default '())))
;; 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
(unfold (cut > <> count)
(lambda (n)
(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"))))
(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.
(($ <nix-configuration> package sandbox build-sandbox-items extra-config)
(with-imported-modules (source-module-closure
'((guix build store-copy)))
(use-modules (guix build utils)
(ice-9 format)
(srfi srfi-1)
(srfi srfi-26))
(for-each (cut mkdir-p <>) '("/nix/store" "/nix/var/log"
(chown "/nix/store"
(passwd:uid (getpw "root")) (group:gid (getpw "nixbld01")))
(chmod "/nix/store" #o775)
(for-each (cut chmod <> #o777) '("/nix/var/nix/profiles"
(mkdir-p "/etc/nix")
(with-output-to-file "/etc/nix/nix.conf"
(lambda _
(format #t "sandbox = ~a~%" (if #$sandbox "true" "false"))
;; config.nix captures store file names.
(format #t "build-sandbox-paths = ~{~a ~}~%"
(append (append-map (cut call-with-input-file <> read)
'#$(map references-file
(list package)))
(for-each (cut display <>) '#$extra-config)
(define nix-shepherd-service
;; Return a <shepherd-service> for Nix.
(($ <nix-configuration> package _ _ _ extra-options)
(provision '(nix-daemon))
(documentation "Run nix-daemon.")
(requirement '())
(start #~(make-forkexec-constructor
(list (string-append #$package "/bin/nix-daemon")
(respawn? #f)
(stop #~(make-kill-destructor)))))))
(define nix-service-type
(name 'nix)
(list (service-extension shepherd-root-service-type nix-shepherd-service)
(service-extension account-service-type nix-accounts)
(service-extension activation-service-type nix-activation)
(service-extension profile-service-type
(compose list nix-configuration-package))))
(description "Run the Nix daemon.")
(default-value (nix-configuration))))
;;; nix.scm ends here