145 lines
3.7 KiB
Nix
145 lines
3.7 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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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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cp -v ${pkgs.dbus.daemon}/etc/dbus-1/system.conf $out/system.conf
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# !!! Hm, these `sed' calls are rather error-prone...
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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 and system.d directories to the system
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# bus 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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-e 's|<includedir>system.d</includedir>|${systemIncludeDirs}|'
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cp ${pkgs.dbus.daemon}/etc/dbus-1/session.conf $out/session.conf
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# Add the services and session.d directories to the session bus
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# search path.
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sed -i $out/session.conf \
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-e 's|<standard_session_servicedirs />|${sessionServiceDirs}&|' \
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-e 's|<includedir>session.d</includedir>|${sessionIncludeDirs}|'
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''; # */
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};
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systemServiceDirs = concatMapStrings
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(d: "<servicedir>${d}/share/dbus-1/system-services</servicedir> ")
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cfg.packages;
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systemIncludeDirs = concatMapStrings
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(d: "<includedir>${d}/etc/dbus-1/system.d</includedir> ")
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cfg.packages;
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sessionServiceDirs = concatMapStrings
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(d: "<servicedir>${d}/share/dbus-1/services</servicedir> ")
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cfg.packages;
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sessionIncludeDirs = concatMapStrings
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(d: "<includedir>${d}/etc/dbus-1/session.d</includedir> ")
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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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type = types.bool;
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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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};
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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}/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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[ "/nix/var/nix/profiles/default"
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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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