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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019, 2020, 2021, 2024 Oleg Pykhalov <go.wigust@gmail.com>
;;; Copyright © 2020 Peng Mei Yu <i@pengmeiyu.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 bash)
#: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 file-systems)
#: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
nix-configuration
nix-configuration?))
;;; Commentary:
;;;
;;; This module provides a service definition for the Nix daemon.
;;;
;;; Code:
(define-record-type* <nix-configuration>
nix-configuration make-nix-configuration
nix-configuration?
(package nix-configuration-package ;file-like
(default nix))
(sandbox nix-configuration-sandbox ;boolean
(default #t))
(build-directory nix-configuration-build-directory ;string
(default "/tmp"))
(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
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.
#~(begin
(use-modules (guix build utils)
(srfi srfi-26))
(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-service-etc
(match-lambda
(($ <nix-configuration> package sandbox build-directory build-sandbox-items extra-config)
(let ((ref-file (references-file package)))
`(("nix/nix.conf"
,(computed-file
"nix.conf"
#~(begin
(use-modules (srfi srfi-26)
(ice-9 format))
(with-output-to-file #$output
(lambda _
(define internal-sandbox-paths
(call-with-input-file #$ref-file read))
(format #t "sandbox = ~a~%" (if #$sandbox "true" "false"))
;; config.nix captures store file names.
(format #t "build-sandbox-paths = ~{~a ~}~%"
(append (list (string-append "/bin/sh=" #$bash-minimal "/bin/sh"))
internal-sandbox-paths
'#$build-sandbox-items))
(for-each (cut display <>) '#$extra-config)))))))))))
(define %nix-store-directory
"/nix/store")
(define %immutable-nix-store
;; Read-only store to avoid users or daemons accidentally modifying it.
;; 'nix-daemon' has provisions to remount it read-write in its own name
;; space.
(list (file-system
(device %nix-store-directory)
(mount-point %nix-store-directory)
(type "none")
(check? #f)
(flags '(read-only bind-mount)))))
(define nix-shepherd-service
;; Return a <shepherd-service> for Nix.
(match-lambda
(($ <nix-configuration> package _ build-directory _ _ extra-options)
(list
(shepherd-service
(provision '(nix-daemon))
(documentation "Run nix-daemon.")
(requirement '(user-processes file-system-/nix/store))
(start #~(make-forkexec-constructor
(list (string-append #$package "/bin/nix-daemon")
#$@extra-options)
#:environment-variables
(list (string-append "TMPDIR=" #$build-directory)
"PATH=/run/current-system/profile/bin")))
(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)
(service-extension etc-service-type nix-service-etc)
(service-extension profile-service-type
(compose list nix-configuration-package))
(service-extension file-system-service-type
(const %immutable-nix-store))))
(description "Run the Nix daemon.")
(default-value (nix-configuration))))
;;; nix.scm ends here
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