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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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 base)
#:use-module (gnu services)
#:use-module (gnu system shadow) ; 'user-account', etc.
#:use-module (gnu system linux) ; 'pam-service', etc.
#:use-module (gnu packages admin)
#:use-module ((gnu packages base)
#:select (glibc-final))
#:use-module (gnu packages package-management)
#:use-module (guix gexp)
#:use-module (guix monads)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 format)
#:export (host-name-service
mingetty-service
nscd-service
syslog-service
guix-service
%base-services))
;;; Commentary:
;;;
;;; Base system services---i.e., services that 99% of the users will want to
;;; use.
;;;
;;; Code:
(define (host-name-service name)
"Return a service that sets the host name to NAME."
(with-monad %store-monad
(return (service
(documentation "Initialize the machine's host name.")
(provision '(host-name))
(start #~(lambda _
(sethostname #$name)))
(respawn? #f)))))
(define* (mingetty-service tty
#:key
(motd (text-file "motd" "Welcome.\n"))
(allow-empty-passwords? #t))
"Return a service to run mingetty on TTY."
(mlet %store-monad ((motd motd))
(return
(service
(documentation (string-append "Run mingetty on " tty "."))
(provision (list (symbol-append 'term- (string->symbol tty))))
;; Since the login prompt shows the host name, wait for the 'host-name'
;; service to be done.
(requirement '(host-name))
(start #~(make-forkexec-constructor
(string-append #$mingetty "/sbin/mingetty")
"--noclear" #$tty))
(stop #~(make-kill-destructor))
(pam-services
;; Let 'login' be known to PAM. All the mingetty services will have
;; that PAM service, but that's fine because they're all identical and
;; duplicates are removed.
(list (unix-pam-service "login"
#:allow-empty-passwords? allow-empty-passwords?
#:motd motd)))))))
(define* (nscd-service #:key (glibc glibc-final))
"Return a service that runs libc's name service cache daemon (nscd)."
(with-monad %store-monad
(return (service
(documentation "Run libc's name service cache daemon (nscd).")
(provision '(nscd))
(start
#~(make-forkexec-constructor (string-append #$glibc "/sbin/nscd")
"-f" "/dev/null"
"--foreground"))
(stop #~(make-kill-destructor))
(respawn? #f)))))
(define (syslog-service)
"Return a service that runs 'syslogd' with reasonable default settings."
;; Snippet adapted from the GNU inetutils manual.
(define contents "
# Log all kernel messages, authentication messages of
# level notice or higher and anything of level err or
# higher to the console.
# Don't log private authentication messages!
*.err;kern.*;auth.notice;authpriv.none /dev/console
# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none /var/log/messages
# Same, in a different place.
*.info;mail.none;authpriv.none /dev/tty12
# The authpriv file has restricted access.
authpriv.* /var/log/secure
# Log all the mail messages in one place.
mail.* /var/log/maillog
")
(mlet %store-monad
((syslog.conf (text-file "syslog.conf" contents)))
(return
(service
(documentation "Run the syslog daemon (syslogd).")
(provision '(syslogd))
(start
#~(make-forkexec-constructor (string-append #$inetutils
"/libexec/syslogd")
"--no-detach"
"--rcfile" #$syslog.conf))
(stop #~(make-kill-destructor))))))
(define* (guix-build-accounts count #:key
(first-uid 30001)
(gid 30000)
(shadow shadow))
"Return a list of COUNT user accounts for Guix build users, with UIDs
starting at FIRST-UID, and under GID."
(with-monad %store-monad
(return (unfold (cut > <> count)
(lambda (n)
(user-account
(name (format #f "guixbuilder~2,'0d" n))
(password "!")
(uid (+ first-uid n -1))
(gid gid)
(comment (format #f "Guix Build User ~2d" n))
(home-directory "/var/empty")
(shell #~(string-append #$shadow "/sbin/nologin"))))
1+
1))))
(define* (guix-service #:key (guix guix) (builder-group "guixbuild")
(build-user-gid 30000) (build-accounts 10))
"Return a service that runs the build daemon from GUIX, and has
BUILD-ACCOUNTS user accounts available under BUILD-USER-GID."
(mlet %store-monad ((accounts (guix-build-accounts build-accounts
#:gid build-user-gid)))
(return (service
(provision '(guix-daemon))
(start
#~(make-forkexec-constructor (string-append #$guix
"/bin/guix-daemon")
"--build-users-group"
#$builder-group))
(stop #~(make-kill-destructor))
(user-accounts accounts)
(user-groups (list (user-group
(name builder-group)
(id build-user-gid)
(members (map user-account-name
user-accounts)))))))))
(define %base-services
;; Convenience variable holding the basic services.
(let ((motd (text-file "motd" "
This is the GNU operating system, welcome!\n\n")))
(list (mingetty-service "tty1" #:motd motd)
(mingetty-service "tty2" #:motd motd)
(mingetty-service "tty3" #:motd motd)
(mingetty-service "tty4" #:motd motd)
(mingetty-service "tty5" #:motd motd)
(mingetty-service "tty6" #:motd motd)
(syslog-service)
(guix-service)
(nscd-service)
;; FIXME: Make this an activation-time thing instead of a service.
(host-name-service "gnu"))))
;;; base.scm ends here
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