160 lines
4.4 KiB
Nix
160 lines
4.4 KiB
Nix
# D-Bus configuration and system bus daemon.
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{ config, pkgs, ... }:
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with pkgs.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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buildCommand = ''
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ensureDir $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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# FIXME: these are copied verbatim from the dbus source tree. We
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# should install and use the originals.
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systemd.units."dbus.socket".text =
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''
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[Unit]
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Description=D-Bus System Message Bus Socket
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[Socket]
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ListenStream=/var/run/dbus/system_bus_socket
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'';
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systemd.units."dbus.service".text =
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''
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[Unit]
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Description=D-Bus System Message Bus
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Requires=dbus.socket
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[Service]
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ExecStartPre=${pkgs.dbus_tools}/bin/dbus-uuidgen --ensure
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ExecStartPre=-${pkgs.coreutils}/bin/rm -f /var/run/dbus/pid
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ExecStart=${pkgs.dbus_daemon}/bin/dbus-daemon --system --address=systemd: --nofork --systemd-activation
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ExecReload=${pkgs.dbus_tools}/bin/dbus-send --print-reply --system --type=method_call --dest=org.freedesktop.DBus / org.freedesktop.DBus.ReloadConfig
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OOMScoreAdjust=-900
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'';
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security.setuidOwners = singleton
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{ program = "dbus-daemon-launch-helper";
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source = "${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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environment.pathsToLink = [ "/etc/dbus-1" "/share/dbus-1" ];
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};
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}
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