128 lines
5.3 KiB
Scheme
128 lines
5.3 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services dbus)
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#:use-module (gnu services)
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#:use-module (gnu system shadow)
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#:use-module (gnu packages glib)
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#:use-module (gnu packages admin)
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#:use-module (guix monads)
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#:use-module (guix store)
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#:use-module (guix gexp)
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#:export (dbus-service))
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;;; Commentary:
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;;;
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;;; This module supports the configuration of the D-Bus message bus
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;;; (http://dbus.freedesktop.org/). D-Bus is an inter-process communication
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;;; facility. Its "system bus" is used to allow system services to
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;;; communicate and be notified of system-wide events.
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;;;
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;;; Code:
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(define (dbus-configuration-directory dbus services)
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"Return a configuration directory for @var{dbus} that includes the
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@code{etc/dbus-1/system.d} directories of each package listed in
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@var{services}."
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(define build
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#~(begin
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(use-modules (sxml simple)
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(srfi srfi-1))
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(define (services->sxml services)
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;; Return the SXML 'includedir' clauses for DIRS.
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`(busconfig
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,@(append-map (lambda (dir)
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`((includedir
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,(string-append dir "/etc/dbus-1/system.d"))
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(servicedir ;for '.service' files
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,(string-append dir "/share/dbus-1/services"))))
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services)))
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(mkdir #$output)
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(copy-file (string-append #$dbus "/etc/dbus-1/system.conf")
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(string-append #$output "/system.conf"))
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;; The default 'system.conf' has an <includedir> clause for
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;; 'system.d', so create it.
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(mkdir (string-append #$output "/system.d"))
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;; 'system-local.conf' is automatically included by the default
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;; 'system.conf', so this is where we stuff our own things.
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(call-with-output-file (string-append #$output "/system-local.conf")
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(lambda (port)
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(sxml->xml (services->sxml (list #$@services))
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port)))))
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(gexp->derivation "dbus-configuration" build))
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(define* (dbus-service services #:key (dbus dbus))
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"Return a service that runs the system bus, using @var{dbus}, with support
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for @var{services}.
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@var{services} must be a list of packages that provide an
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@file{etc/dbus-1/system.d} directory containing additional D-Bus configuration
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and policy files. For example, to allow avahi-daemon to use the system bus,
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@var{services} must be equal to @code{(list avahi)}."
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(mlet %store-monad ((conf (dbus-configuration-directory dbus services)))
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(return
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(service
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(documentation "Run the D-Bus system daemon.")
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(provision '(dbus-system))
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(requirement '(user-processes))
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(start #~(make-forkexec-constructor
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(list (string-append #$dbus "/bin/dbus-daemon")
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"--nofork"
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(string-append "--config-file=" #$conf "/system.conf"))))
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(stop #~(make-kill-destructor))
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(user-groups (list (user-group
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(name "messagebus")
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(system? #t))))
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(user-accounts (list (user-account
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(name "messagebus")
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(group "messagebus")
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(system? #t)
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(comment "D-Bus system bus user")
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(home-directory "/var/run/dbus")
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(shell
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#~(string-append #$shadow "/sbin/nologin")))))
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(activate #~(begin
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(use-modules (guix build utils))
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(mkdir-p "/var/run/dbus")
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(let ((user (getpwnam "messagebus")))
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(chown "/var/run/dbus"
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(passwd:uid user) (passwd:gid user)))
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(unless (file-exists? "/etc/machine-id")
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(format #t "creating /etc/machine-id...~%")
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(let ((prog (string-append #$dbus "/bin/dbus-uuidgen")))
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;; XXX: We can't use 'system' because the initrd's
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;; guile system(3) only works when 'sh' is in $PATH.
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(let ((pid (primitive-fork)))
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(if (zero? pid)
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(call-with-output-file "/etc/machine-id"
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(lambda (port)
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(close-fdes 1)
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(dup2 (port->fdes port) 1)
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(execl prog)))
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(waitpid pid)))))))))))
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;;; dbus.scm ends here
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