nixpkgs/nixos/modules/services/system/dbus.nix

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# D-Bus configuration and system bus daemon.
{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.dbus;
homeDir = "/var/run/dbus";
configDir = pkgs.stdenv.mkDerivation {
name = "dbus-conf";
preferLocalBuild = true;
buildCommand = ''
ensureDir $out
cp -v ${pkgs.dbus_daemon}/etc/dbus-1/system.conf $out/system.conf
# !!! Hm, these `sed' calls are rather error-prone...
# Tell the daemon where the setuid wrapper around
# dbus-daemon-launch-helper lives.
sed -i $out/system.conf \
-e 's|<servicehelper>.*/libexec/dbus-daemon-launch-helper|<servicehelper>${config.security.wrapperDir}/dbus-daemon-launch-helper|'
# Add the system-services and system.d directories to the system
# bus search path.
sed -i $out/system.conf \
-e 's|<standard_system_servicedirs/>|${systemServiceDirs}|' \
-e 's|<includedir>system.d</includedir>|${systemIncludeDirs}|'
cp ${pkgs.dbus_daemon}/etc/dbus-1/session.conf $out/session.conf
# Add the services and session.d directories to the session bus
# search path.
sed -i $out/session.conf \
-e 's|<standard_session_servicedirs />|${sessionServiceDirs}&|' \
-e 's|<includedir>session.d</includedir>|${sessionIncludeDirs}|'
''; # */
};
systemServiceDirs = concatMapStrings
(d: "<servicedir>${d}/share/dbus-1/system-services</servicedir> ")
cfg.packages;
systemIncludeDirs = concatMapStrings
(d: "<includedir>${d}/etc/dbus-1/system.d</includedir> ")
cfg.packages;
sessionServiceDirs = concatMapStrings
(d: "<servicedir>${d}/share/dbus-1/services</servicedir> ")
cfg.packages;
sessionIncludeDirs = concatMapStrings
(d: "<includedir>${d}/etc/dbus-1/session.d</includedir> ")
cfg.packages;
in
{
###### interface
options = {
services.dbus = {
enable = mkOption {
default = true;
description = ''
Whether to start the D-Bus message bus daemon, which is
required by many other system services and applications.
'';
merge = pkgs.lib.mergeEnableOption;
};
packages = mkOption {
default = [];
description = ''
Packages whose D-Bus configuration files should be included in
the configuration of the D-Bus system-wide message bus.
Specifically, every file in
<filename><replaceable>pkg</replaceable>/etc/dbus-1/system.d</filename>
is included.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.dbus_daemon pkgs.dbus_tools ];
environment.etc = singleton
{ source = configDir;
target = "dbus-1";
};
users.extraUsers.messagebus = {
uid = config.ids.uids.messagebus;
description = "D-Bus system message bus daemon user";
home = homeDir;
group = "messagebus";
};
users.extraGroups.messagebus.gid = config.ids.gids.messagebus;
# FIXME: these are copied verbatim from the dbus source tree. We
# should install and use the originals.
systemd.units."dbus.socket".text =
''
[Unit]
Description=D-Bus System Message Bus Socket
[Socket]
ListenStream=/var/run/dbus/system_bus_socket
'';
2013-10-27 22:36:41 +00:00
systemd.units."dbus.service".text =
''
[Unit]
Description=D-Bus System Message Bus
Requires=dbus.socket
[Service]
ExecStartPre=${pkgs.dbus_tools}/bin/dbus-uuidgen --ensure
ExecStartPre=-${pkgs.coreutils}/bin/rm -f /var/run/dbus/pid
ExecStart=${pkgs.dbus_daemon}/bin/dbus-daemon --system --address=systemd: --nofork --systemd-activation
2012-07-20 21:38:36 +00:00
ExecReload=${pkgs.dbus_tools}/bin/dbus-send --print-reply --system --type=method_call --dest=org.freedesktop.DBus / org.freedesktop.DBus.ReloadConfig
OOMScoreAdjust=-900
'';
security.setuidOwners = singleton
{ program = "dbus-daemon-launch-helper";
source = "${pkgs.dbus_daemon}/libexec/dbus-daemon-launch-helper";
owner = "root";
group = "messagebus";
setuid = true;
setgid = false;
permissions = "u+rx,g+rx,o-rx";
};
services.dbus.packages =
[ "/nix/var/nix/profiles/default"
config.system.path
];
environment.pathsToLink = [ "/etc/dbus-1" "/share/dbus-1" ];
};
}