nixpkgs/modules/services/system/dbus.nix
Eelco Dolstra 25fd35862a * Add /nix/var/nix/profiles/default and config.system.path to the list
of DBus configuration directories.  Thus packages with DBus
  configuration files installed in the default profile will be found
  automatically.  (It would be nice to include $HOME/.nix-profile in
  the session bus search path, but I don't think that's possible.)

svn path=/nixos/trunk/; revision=22737
2010-07-26 14:10:04 +00:00

167 lines
4.1 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}|' \
-e 's|<includedir>system.d</includedir>|${systemIncludeDirs}|'
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}|' \
-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 = [ dbus.daemon dbus.tools ];
environment.etc = singleton
{ 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";
};
services.dbus.packages =
[ "/nix/var/nix/profiles/default"
config.system.path
];
};
}