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nixpkgs/modules/services/system/dbus.nix

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# D-Bus system-wide daemon.
{pkgs, config, ...}:
with pkgs.lib;
let
cfg = config.services.dbus;
inherit (pkgs) dbus;
homeDir = "/var/run/dbus";
configFile = pkgs.stdenv.mkDerivation {
name = "dbus-conf";
buildCommand = ''
ensureDir $out
ln -s ${dbus}/etc/dbus-1/system.conf $out/system.conf
# Note: system.conf includes ./system.d (i.e. it has a relative,
# not absolute path).
ensureDir $out/system.d
for i in ${toString cfg.packages}; do
ln -s $i/etc/dbus-1/system.d/* $out/system.d/
done
''; # */
};
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 = [dbus.daemon dbus.tools];
users.extraUsers = singleton
{ name = "messagebus";
uid = config.ids.uids.messagebus;
description = "D-Bus system message bus daemon user";
home = homeDir;
};
jobs = singleton
{ name = "dbus";
startOn = "startup";
stopOn = "shutdown";
preStart =
''
mkdir -m 0755 -p ${homeDir}
chown messagebus ${homeDir}
mkdir -m 0755 -p /var/lib/dbus
${dbus.tools}/bin/dbus-uuidgen --ensure
rm -f ${homeDir}/pid
# !!! hack - dbus should be running once this job is
# considered "running"; should be fixable once we have
# Upstart 0.6.
${dbus}/bin/dbus-daemon --config-file=${configFile}/system.conf
'';
postStop =
''
pid=$(cat ${homeDir}/pid)
if test -n "$pid"; then
kill -9 $pid
fi
'';
};
};
}