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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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