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127 lines
3 KiB
Nix
127 lines
3 KiB
Nix
# D-Bus configuration and system bus daemon.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.dbus;
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homeDir = "/var/run/dbus";
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systemExtraxml = concatStrings (flip concatMap cfg.packages (d: [
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"<servicedir>${d}/share/dbus-1/system-services</servicedir>"
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"<includedir>${d}/etc/dbus-1/system.d</includedir>"
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]));
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sessionExtraxml = concatStrings (flip concatMap cfg.packages (d: [
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"<servicedir>${d}/share/dbus-1/services</servicedir>"
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"<includedir>${d}/etc/dbus-1/session.d</includedir>"
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]));
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configDir = pkgs.stdenv.mkDerivation {
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name = "dbus-conf";
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preferLocalBuild = true;
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allowSubstitutes = false;
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buildCommand = ''
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mkdir -p $out
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sed '${./dbus-system-local.conf.in}' \
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-e 's,@servicehelper@,${config.security.wrapperDir}/dbus-daemon-launch-helper,g' \
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-e 's,@extra@,${systemExtraxml},' \
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> "$out/system-local.conf"
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sed '${./dbus-session-local.conf.in}' \
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-e 's,@extra@,${sessionExtraxml},' \
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> "$out/session-local.conf"
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'';
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};
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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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type = types.bool;
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default = false;
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internal = 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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};
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packages = mkOption {
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type = types.listOf types.path;
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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 = [ pkgs.dbus.daemon pkgs.dbus_tools ];
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environment.etc = singleton
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{ source = configDir;
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target = "dbus-1";
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};
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users.extraUsers.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.messagebus.gid = config.ids.gids.messagebus;
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systemd.packages = [ pkgs.dbus.daemon ];
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security.setuidOwners = singleton
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{ program = "dbus-daemon-launch-helper";
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source = "${pkgs.dbus_daemon.out}/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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services.dbus.packages = [
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pkgs.dbus.out
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config.system.path
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];
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# Don't restart dbus-daemon. Bad things tend to happen if we do.
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systemd.services.dbus.reloadIfChanged = true;
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systemd.services.dbus.restartTriggers = [ configDir ];
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environment.pathsToLink = [ "/etc/dbus-1" "/share/dbus-1" ];
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};
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}
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