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+;;; GNU Guix --- Functional package management for GNU
+;;; 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 upower)
+ #:use-module (gnu services)
+ #:use-module (gnu system shadow)
+ #:use-module (gnu packages gnome)
+ #:use-module (ice-9 match)
+ #:use-module (guix monads)
+ #:use-module (guix store)
+ #:use-module (guix gexp)
+ #:export (upower-service))
+
+;;; Commentary:
+;;;
+;;; This module provides service definitions for the UPower power and battery
+;;; monitoring service.
+;;;
+;;; Code:
+
+(define* (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 (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
+ "/run/current-system/profile/sbin/nologin"))))))))
+
+;;; upower.scm ends here