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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Andy Wingo <wingo@igalia.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 desktop)
#:use-module (gnu services)
#:use-module (gnu system shadow)
#:use-module (gnu packages glib)
#:use-module (gnu packages admin)
#:use-module (gnu packages gnome)
#:use-module (guix monads)
#:use-module (guix store)
#:use-module (guix gexp)
#:use-module (ice-9 match)
#:export (dbus-service
upower-service
colord-service))
;;; Commentary:
;;;
;;; This module contains service definitions for a "desktop" environment.
;;;
;;; Code:
;;;
;;; D-Bus.
;;;
(define (dbus-configuration-directory dbus services)
"Return a configuration directory for @var{dbus} that includes the
@code{etc/dbus-1/system.d} directories of each package listed in
@var{services}."
(define build
#~(begin
(use-modules (sxml simple)
(srfi srfi-1))
(define (services->sxml services)
;; Return the SXML 'includedir' clauses for DIRS.
`(busconfig
,@(append-map (lambda (dir)
`((includedir
,(string-append dir "/etc/dbus-1/system.d"))
(servicedir ;for '.service' files
,(string-append dir "/share/dbus-1/services"))))
services)))
(mkdir #$output)
(copy-file (string-append #$dbus "/etc/dbus-1/system.conf")
(string-append #$output "/system.conf"))
;; The default 'system.conf' has an <includedir> clause for
;; 'system.d', so create it.
(mkdir (string-append #$output "/system.d"))
;; 'system-local.conf' is automatically included by the default
;; 'system.conf', so this is where we stuff our own things.
(call-with-output-file (string-append #$output "/system-local.conf")
(lambda (port)
(sxml->xml (services->sxml (list #$@services))
port)))))
(gexp->derivation "dbus-configuration" build))
(define* (dbus-service services #:key (dbus dbus))
"Return a service that runs the \"system bus\", using @var{dbus}, with
support for @var{services}.
@uref{http://dbus.freedesktop.org/, D-Bus} is an inter-process communication
facility. Its system bus is used to allow system services to communicate and
be notified of system-wide events.
@var{services} must be a list of packages that provide an
@file{etc/dbus-1/system.d} directory containing additional D-Bus configuration
and policy files. For example, to allow avahi-daemon to use the system bus,
@var{services} must be equal to @code{(list avahi)}."
(mlet %store-monad ((conf (dbus-configuration-directory dbus services)))
(return
(service
(documentation "Run the D-Bus system daemon.")
(provision '(dbus-system))
(requirement '(user-processes))
(start #~(make-forkexec-constructor
(list (string-append #$dbus "/bin/dbus-daemon")
"--nofork"
(string-append "--config-file=" #$conf "/system.conf"))))
(stop #~(make-kill-destructor))
(user-groups (list (user-group
(name "messagebus")
(system? #t))))
(user-accounts (list (user-account
(name "messagebus")
(group "messagebus")
(system? #t)
(comment "D-Bus system bus user")
(home-directory "/var/run/dbus")
(shell
#~(string-append #$shadow "/sbin/nologin")))))
(activate #~(begin
(use-modules (guix build utils))
(mkdir-p "/var/run/dbus")
(let ((user (getpwnam "messagebus")))
(chown "/var/run/dbus"
(passwd:uid user) (passwd:gid user)))
(unless (file-exists? "/etc/machine-id")
(format #t "creating /etc/machine-id...~%")
(let ((prog (string-append #$dbus "/bin/dbus-uuidgen")))
;; XXX: We can't use 'system' because the initrd's
;; guile system(3) only works when 'sh' is in $PATH.
(let ((pid (primitive-fork)))
(if (zero? pid)
(call-with-output-file "/etc/machine-id"
(lambda (port)
(close-fdes 1)
(dup2 (port->fdes port) 1)
(execl prog)))
(waitpid pid)))))))))))
;;;
;;; Upower D-Bus service.
;;;
(define* (upower-configuration-file #:key watts-up-pro? poll-batteries?
ignore-lid? use-percentage-for-policy?
percentage-low percentage-critical
percentage-action time-low
time-critical time-action
critical-power-action)
"Return an upower-daemon configuration file."
(define (bool value)
(if value "true\n" "false\n"))
(text-file "UPower.conf"
(string-append
"[UPower]\n"
"EnableWattsUpPro=" (bool watts-up-pro?)
"NoPollBatteries=" (bool (not poll-batteries?))
"IgnoreLid=" (bool ignore-lid?)
"UsePercentageForPolicy=" (bool use-percentage-for-policy?)
"PercentageLow=" (number->string percentage-low) "\n"
"PercentageCritical=" (number->string percentage-critical) "\n"
"PercentageAction=" (number->string percentage-action) "\n"
"TimeLow=" (number->string time-low) "\n"
"TimeCritical=" (number->string time-critical) "\n"
"TimeAction=" (number->string time-action) "\n"
"CriticalPowerAction=" (match critical-power-action
('hybrid-sleep "HybridSleep")
('hibernate "Hibernate")
('power-off "PowerOff"))
"\n")))
(define* (upower-service #:key (upower upower)
(watts-up-pro? #f)
(poll-batteries? #t)
(ignore-lid? #f)
(use-percentage-for-policy? #f)
(percentage-low 10)
(percentage-critical 3)
(percentage-action 2)
(time-low 1200)
(time-critical 300)
(time-action 120)
(critical-power-action 'hybrid-sleep))
"Return a service that runs @uref{http://upower.freedesktop.org/,
@command{upowerd}}, a system-wide monitor for power consumption and battery
levels, with the given configuration settings. It implements the
@code{org.freedesktop.UPower} D-Bus interface, and is notably used by GNOME."
(mlet %store-monad ((config (upower-configuration-file
#:watts-up-pro? watts-up-pro?
#:poll-batteries? poll-batteries?
#:ignore-lid? ignore-lid?
#:use-percentage-for-policy? use-percentage-for-policy?
#:percentage-low percentage-low
#:percentage-critical percentage-critical
#:percentage-action percentage-action
#:time-low time-low
#:time-critical time-critical
#:time-action time-action
#:critical-power-action critical-power-action)))
(return
(service
(documentation "Run the UPower power and battery monitor.")
(provision '(upower-daemon))
(requirement '(dbus-system udev))
(start #~(make-forkexec-constructor
(list (string-append #$upower "/libexec/upowerd"))
#:environment-variables
(list (string-append "UPOWER_CONF_FILE_NAME=" #$config))))
(stop #~(make-kill-destructor))
(activate #~(begin
(use-modules (guix build utils))
(mkdir-p "/var/lib/upower")
(let ((user (getpwnam "upower")))
(chown "/var/lib/upower"
(passwd:uid user) (passwd:gid user)))))
(user-groups (list (user-group
(name "upower")
(system? #t))))
(user-accounts (list (user-account
(name "upower")
(group "upower")
(system? #t)
(comment "UPower daemon user")
(home-directory "/var/empty")
(shell
#~(string-append #$shadow "/sbin/nologin")))))))))
;;;
;;; Colord D-Bus service.
;;;
(define* (colord-service #:key (colord colord))
"Return a service that runs @command{colord}, a system service with a D-Bus
interface to manage the color profiles of input and output devices such as
screens and scanners. It is notably used by the GNOME Color Manager graphical
tool. See @uref{http://www.freedesktop.org/software/colord/, the colord web
site} for more information."
(with-monad %store-monad
(return
(service
(documentation "Run the colord color management service.")
(provision '(colord-daemon))
(requirement '(dbus-system udev))
(start #~(make-forkexec-constructor
(list (string-append #$colord "/libexec/colord"))))
(stop #~(make-kill-destructor))
(activate #~(begin
(use-modules (guix build utils))
(mkdir-p "/var/lib/colord")
(let ((user (getpwnam "colord")))
(chown "/var/lib/colord"
(passwd:uid user) (passwd:gid user)))))
(user-groups (list (user-group
(name "colord")
(system? #t))))
(user-accounts (list (user-account
(name "colord")
(group "colord")
(system? #t)
(comment "colord daemon user")
(home-directory "/var/empty")
(shell
#~(string-append #$shadow "/sbin/nologin")))))))))
;;; desktop.scm ends here
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