--- /dev/null
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 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 avahi)
+ #:use-module (gnu services)
+ #:use-module (gnu system shadow)
+ #:use-module (gnu packages avahi)
+ #:use-module (guix monads)
+ #:use-module (guix gexp)
+ #:export (avahi-service))
+
+;;; Commentary:
+;;;
+;;; This module provides service definitions for the Avahi
+;;; "zero-configuration" tool set.
+;;;
+;;; Code:
+
+(define* (configuration-file #:key host-name publish?
+ ipv4? ipv6? wide-area? domains-to-browse)
+ "Return an avahi-daemon configuration file."
+ (define (bool value)
+ (if value "yes\n" "no\n"))
+
+ (text-file "avahi-daemon.conf"
+ (string-append
+ "[server]\n"
+ (if host-name
+ (string-append "host-name=" host-name "\n")
+ "")
+
+ "browse-domains=" (string-join domains-to-browse)
+ "\n"
+ "use-ipv4=" (bool ipv4?)
+ "use-ipv6=" (bool ipv6?)
+ "[wide-area]\n"
+ "enable-wide-area=" (bool wide-area?)
+ "[publish]\n"
+ "disable-publishing=" (bool (not publish?)))))
+
+(define* (avahi-service #:key (avahi avahi)
+ host-name
+ (publish? #t)
+ (ipv4? #t) (ipv6? #t)
+ wide-area?
+ (domains-to-browse '()))
+ "Return a service that runs @command{avahi-daemon}, a system-wide
+mDNS/DNS-SD responder that allows for service discovery and
+\"zero-configuration\" host name lookups.
+
+If @var{host-name} is different from @code{#f}, use that as the host name to
+publish for this machine; otherwise, use the machine's actual host name.
+
+When @var{publish?} is true, publishing of host names and services is allowed;
+in particular, avahi-daemon will publish the machine's host name and IP
+address via mDNS on the local network.
+
+When @var{wide-area?} is true, DNS-SD over unicast DNS is enabled.
+
+Boolean values @var{ipv4?} and @var{ipv6?} determine whether to use IPv4/IPv6
+sockets."
+ (mlet %store-monad ((config (configuration-file #:host-name host-name
+ #:publish? publish?
+ #:ipv4? ipv4?
+ #:ipv6? ipv6?
+ #:wide-area? wide-area?
+ #:domains-to-browse
+ domains-to-browse)))
+ (return
+ (service
+ (documentation "Run the Avahi mDNS/DNS-SD responder.")
+ (provision '(avahi-daemon))
+ (requirement '(dbus-system networking))
+
+ (start #~(make-forkexec-constructor
+ (string-append #$avahi "/sbin/avahi-daemon")
+ "--syslog" "-f" #$config))
+ (stop #~(make-kill-destructor))
+ (activate #~(begin
+ (use-modules (guix build utils))
+ (mkdir-p "/var/run/avahi-daemon")))
+
+ (user-groups (list (user-group
+ (name "avahi"))))
+ (user-accounts (list (user-account
+ (name "avahi")
+ (group "avahi")
+ (comment "Avahi daemon user")
+ (home-directory "/var/empty")
+ (shell
+ "/run/current-system/profile/sbin/nologin"))))))))
+
+;;; avahi.scm ends here
--- /dev/null
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 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 dbus)
+ #:use-module (gnu services)
+ #:use-module (gnu system shadow)
+ #:use-module (gnu packages glib)
+ #:use-module (guix monads)
+ #:use-module (guix gexp)
+ #:export (dbus-service))
+
+;;; Commentary:
+;;;
+;;; This module supports the configuration of the D-Bus message bus
+;;; (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.
+;;;
+;;; Code:
+
+(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))
+
+ (define (services->sxml services)
+ ;; Return the SXML 'includedir' clauses for DIRS.
+ `(busconfig
+ ,@(map (lambda (dir)
+ `(includedir ,(string-append dir
+ "/etc/dbus-1/system.d")))
+ 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}.
+
+@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
+ (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"))))
+ (user-accounts (list (user-account
+ (name "messagebus")
+ (group "messagebus")
+ (comment "D-Bus system bus user")
+ (home-directory "/var/run/dbus")
+ (shell
+ "/run/current-system/profile/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)))))))))))
+
+;;; dbus.scm ends here
HCoop / jackhill / guix / guix.git / commitdiff