;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2019, 2020 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 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 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 ;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 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-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 #$sandbox "true" "false")) ;; config.nix captures store file names. (format #t "build-sandbox-paths = ~{~a ~}~%" (append internal-sandbox-paths '#$build-sandbox-items)) (for-each (cut display <>) '#$extra-config))))))))))) (define nix-shepherd-service ;; Return a <shepherd-service> for Nix. (match-lambda (($ <nix-configuration> package _ _ _ extra-options) (list (shepherd-service (provision '(nix-daemon)) (documentation "Run nix-daemon.") (requirement '()) (start #~(make-forkexec-constructor (list (string-append #$package "/bin/nix-daemon") #$@extra-options))) (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)))) (description "Run the Nix daemon.") (default-value (nix-configuration)))) ;;; nix.scm ends here