nixpkgs-suyu/modules/services/system/dbus.nix
Eelco Dolstra 44656be396 * dbus-daemon: use /etc/dbus-1/system.conf (i.e. ‘--system’) rather than
${configDir}/system.conf.  This is necessary to enable dbus to
  reload its configuration on SIGHUP after a nixos-rebuild.  (The
  daemon cannot be restarted because then console-kit-daemon loses its
  state.)
* Generate a proper /etc/dbus-1/session.conf.

svn path=/nixos/trunk/; revision=22572
2010-07-13 09:22:52 +00:00

167 lines
4.2 KiB
Nix

# D-Bus configuration and system bus daemon.
{ config, pkgs, ... }:
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
cp ${dbus}/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}|'
cp ${dbus}/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}|'
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;
sessionServiceDirs = concatMapStrings
(d: "<servicedir>${d}/share/dbus-1/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 and started syslogd";
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 --system";
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";
};
};
}