nixpkgs/modules/services/system/dbus.nix
Eelco Dolstra 7aecd0ca53 * hal: depend on both dbus and acpid (if enabled).
* dbus: don't signal Upstart, since that seems to make it forget about
  pending events or something.  In any case starting dbus after acpid
  was running wouldn't trigger hal to be started (but the other way
  around did work).

svn path=/nixos/branches/upstart-0.6/; revision=18251
2009-11-07 12:01:12 +00:00

157 lines
3.9 KiB
Nix

# D-Bus system-wide daemon.
{pkgs, config, ...}:
with pkgs.lib;
let
cfg = config.services.dbus;
inherit (pkgs) dbus;
homeDir = "/var/run/dbus";
configDir = pkgs.stdenv.mkDerivation {
name = "dbus-conf";
buildCommand = ''
ensureDir $out
ln -s ${dbus}/etc/dbus-1/session.conf $out/session.conf
cp ${dbus}/etc/dbus-1/system.conf $out/system.conf
# 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 directories to the daemon's search path.
sed -i $out/system.conf \
-e 's|<standard_system_servicedirs/>|${systemServiceDirs}|'
# Note: system.conf includes ./system.d (i.e. it has a relative,
# not absolute path).
ensureDir $out/session.d
ensureDir $out/system.d
for i in ${toString cfg.packages}; do
for j in $i/etc/dbus-1/session.d/*; do
ln -s $j $out/session.d/
done
for j in $i/etc/dbus-1/system.d/*; do
ln -s $j $out/system.d/
done
done
''; # */
};
systemServiceDirs = concatMapStrings
(d: "<servicedir>${d}/share/dbus-1/system-services</servicedir> ")
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 = [dbus.daemon dbus.tools];
environment.etc = singleton
# We need /etc/dbus-1/system.conf for now, because
# dbus-daemon-launch-helper is called with an empty environment
# and no arguments. So we have no way to tell it the location
# of our config file.
{ source = configDir;
target = "dbus-1";
};
users.extraUsers = singleton
{ name = "messagebus";
uid = config.ids.uids.messagebus;
description = "D-Bus system message bus daemon user";
home = homeDir;
group = "messagebus";
};
users.extraGroups = singleton
{ name = "messagebus";
gid = config.ids.gids.messagebus;
};
jobs.dbus =
{ startOn = "started udev";
preStart =
''
mkdir -m 0755 -p ${homeDir}
chown messagebus ${homeDir}
mkdir -m 0755 -p /var/lib/dbus
${dbus.tools}/bin/dbus-uuidgen --ensure
rm -f ${homeDir}/pid
'';
daemonType = "fork";
exec = "${dbus}/bin/dbus-daemon --config-file=${configDir}/system.conf";
postStop =
''
# !!! Hack: doesn't belong here.
pid=$(cat /var/run/ConsoleKit/pid || true)
if test -n "$pid"; then
kill $pid || true
rm -f /var/run/ConsoleKit/pid
fi
'';
};
security.setuidOwners = singleton
{ program = "dbus-daemon-launch-helper";
source = "${dbus}/libexec/dbus-daemon-launch-helper";
owner = "root";
group = "messagebus";
setuid = true;
setgid = false;
permissions = "u+rx,g+rx,o-rx";
};
};
}