162 lines
4 KiB
Nix
162 lines
4 KiB
Nix
# D-Bus system-wide daemon.
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{pkgs, config, ...}:
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with pkgs.lib;
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let
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cfg = config.services.dbus;
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inherit (pkgs) dbus;
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homeDir = "/var/run/dbus";
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configDir = pkgs.stdenv.mkDerivation {
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name = "dbus-conf";
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buildCommand = ''
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ensureDir $out
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ln -s ${dbus}/etc/dbus-1/session.conf $out/session.conf
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cp ${dbus}/etc/dbus-1/system.conf $out/system.conf
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# Tell the daemon where the setuid wrapper around
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# dbus-daemon-launch-helper lives.
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sed -i $out/system.conf \
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-e 's|<servicehelper>.*/libexec/dbus-daemon-launch-helper|<servicehelper>${config.security.wrapperDir}/dbus-daemon-launch-helper|'
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# Add the system-services directories to the daemon's search path.
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sed -i $out/system.conf \
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-e 's|<standard_system_servicedirs/>|${systemServiceDirs}|'
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# Note: system.conf includes ./system.d (i.e. it has a relative,
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# not absolute path).
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ensureDir $out/session.d
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ensureDir $out/system.d
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for i in ${toString cfg.packages}; do
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for j in $i/etc/dbus-1/session.d/*; do
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ln -s $j $out/session.d/
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done
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for j in $i/etc/dbus-1/system.d/*; do
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ln -s $j $out/system.d/
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done
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done
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''; # */
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};
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systemServiceDirs = concatMapStrings
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(d: "<servicedir>${d}/share/dbus-1/system-services</servicedir> ")
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cfg.packages;
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in
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{
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###### interface
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options = {
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services.dbus = {
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enable = mkOption {
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default = true;
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description = ''
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Whether to start the D-Bus message bus daemon, which is
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required by many other system services and applications.
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'';
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merge = pkgs.lib.mergeEnableOption;
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};
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packages = mkOption {
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default = [];
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description = ''
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Packages whose D-Bus configuration files should be included in
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the configuration of the D-Bus system-wide message bus.
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Specifically, every file in
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<filename><replaceable>pkg</replaceable>/etc/dbus-1/system.d</filename>
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is included.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.systemPackages = [dbus.daemon dbus.tools];
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environment.etc = singleton
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# We need /etc/dbus-1/system.conf for now, because
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# dbus-daemon-launch-helper is called with an empty environment
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# and no arguments. So we have no way to tell it the location
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# of our config file.
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{ source = configDir;
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target = "dbus-1";
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};
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users.extraUsers = singleton
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{ name = "messagebus";
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uid = config.ids.uids.messagebus;
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description = "D-Bus system message bus daemon user";
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home = homeDir;
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group = "messagebus";
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};
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users.extraGroups = singleton
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{ name = "messagebus";
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gid = config.ids.gids.messagebus;
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};
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jobs.dbus =
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{ startOn = "started udev";
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preStart =
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''
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mkdir -m 0755 -p ${homeDir}
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chown messagebus ${homeDir}
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mkdir -m 0755 -p /var/lib/dbus
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${dbus.tools}/bin/dbus-uuidgen --ensure
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rm -f ${homeDir}/pid
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'';
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daemonType = "fork";
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exec = "${dbus}/bin/dbus-daemon --config-file=${configDir}/system.conf";
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postStart =
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''
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# Signal Upstart that it can connect to the system bus.
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kill -HUP 1 || true
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'';
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postStop =
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''
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# !!! Hack: doesn't belong here.
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pid=$(cat /var/run/ConsoleKit/pid || true)
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if test -n "$pid"; then
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kill $pid || true
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rm -f /var/run/ConsoleKit/pid
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fi
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'';
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};
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security.setuidOwners = singleton
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{ program = "dbus-daemon-launch-helper";
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source = "${dbus}/libexec/dbus-daemon-launch-helper";
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owner = "root";
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group = "messagebus";
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setuid = true;
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setgid = false;
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permissions = "u+rx,g+rx,o-rx";
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};
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};
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}
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