330 lines
11 KiB
Nix
330 lines
11 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.systemd.user;
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inherit (lib) getAttr hm isBool literalExpression mkIf mkMerge mkOption types;
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# From <nixpkgs/nixos/modules/system/boot/systemd-lib.nix>
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mkPathSafeName =
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lib.replaceStrings [ "@" ":" "\\" "[" "]" ] [ "-" "-" "-" "" "" ];
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enabled = cfg.services != { } # \
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|| cfg.slices != { } # \
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|| cfg.sockets != { } # \
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|| cfg.targets != { } # \
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|| cfg.timers != { } # \
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|| cfg.paths != { } # \
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|| cfg.mounts != { } # \
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|| cfg.automounts != { } # \
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|| cfg.sessionVariables != { };
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toSystemdIni = lib.generators.toINI {
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listsAsDuplicateKeys = true;
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mkKeyValue = key: value:
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let
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value' = if isBool value then
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(if value then "true" else "false")
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else
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toString value;
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in "${key}=${value'}";
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};
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buildService = style: name: serviceCfg:
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let
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filename = "${name}.${style}";
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pathSafeName = mkPathSafeName filename;
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# Needed because systemd derives unit names from the ultimate
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# link target.
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source = pkgs.writeTextFile {
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name = pathSafeName;
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text = toSystemdIni serviceCfg;
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destination = "/${filename}";
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} + "/${filename}";
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install = variant: target: {
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name = "systemd/user/${target}.${variant}/${filename}";
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value = { inherit source; };
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};
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in lib.singleton {
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name = "systemd/user/${filename}";
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value = { inherit source; };
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} ++ map (install "wants") (serviceCfg.Install.WantedBy or [ ])
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++ map (install "requires") (serviceCfg.Install.RequiredBy or [ ]);
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buildServices = style: serviceCfgs:
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lib.concatLists (lib.mapAttrsToList (buildService style) serviceCfgs);
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servicesStartTimeoutMs = builtins.toString cfg.servicesStartTimeoutMs;
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unitType = unitKind:
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with types;
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let primitive = either bool (either int str);
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in attrsOf (attrsOf (attrsOf (either primitive (listOf primitive)))) // {
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description = "systemd ${unitKind} unit configuration";
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};
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unitDescription = type: ''
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Definition of systemd per-user ${type} units. Attributes are
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merged recursively.
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</para><para>
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Note that the attributes follow the capitalization and naming used
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by systemd. More details can be found in
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<citerefentry>
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<refentrytitle>systemd.${type}</refentrytitle>
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<manvolnum>5</manvolnum>
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</citerefentry>.
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'';
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unitExample = type:
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literalExpression ''
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{
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${lib.toLower type}-name = {
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Unit = {
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Description = "Example description";
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Documentation = [ "man:example(1)" "man:example(5)" ];
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};
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${type} = {
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…
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};
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};
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};
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'';
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sessionVariables = mkIf (cfg.sessionVariables != { }) {
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"environment.d/10-home-manager.conf".text = lib.concatStringsSep "\n"
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(lib.mapAttrsToList (n: v: "${n}=${toString v}") cfg.sessionVariables)
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+ "\n";
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};
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in {
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meta.maintainers = [ lib.maintainers.rycee ];
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options = {
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systemd.user = {
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systemctlPath = mkOption {
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default = "${pkgs.systemd}/bin/systemctl";
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defaultText = literalExpression ''"''${pkgs.systemd}/bin/systemctl"'';
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type = types.str;
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description = ''
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Absolute path to the <command>systemctl</command> tool. This
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option may need to be set if running Home Manager on a
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non-NixOS distribution.
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'';
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};
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services = mkOption {
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default = { };
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type = unitType "service";
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description = unitDescription "service";
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example = unitExample "Service";
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};
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slices = mkOption {
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default = { };
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type = unitType "slice";
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description = unitDescription "slice";
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example = unitExample "Slice";
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};
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sockets = mkOption {
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default = { };
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type = unitType "socket";
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description = unitDescription "socket";
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example = unitExample "Socket";
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};
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targets = mkOption {
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default = { };
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type = unitType "target";
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description = unitDescription "target";
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example = unitExample "Target";
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};
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timers = mkOption {
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default = { };
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type = unitType "timer";
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description = unitDescription "timer";
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example = unitExample "Timer";
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};
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paths = mkOption {
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default = { };
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type = unitType "path";
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description = unitDescription "path";
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example = unitExample "Path";
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};
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mounts = mkOption {
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default = { };
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type = unitType "mount";
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description = unitDescription "mount";
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example = unitExample "Mount";
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};
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automounts = mkOption {
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default = { };
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type = unitType "automount";
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description = unitDescription "automount";
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example = unitExample "Automount";
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};
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startServices = mkOption {
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default = "suggest";
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type = with types;
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either bool (enum [ "suggest" "legacy" "sd-switch" ]);
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apply = p: if isBool p then if p then "legacy" else "suggest" else p;
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description = ''
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Whether new or changed services that are wanted by active targets
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should be started. Additionally, stop obsolete services from the
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previous generation.
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</para><para>
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The alternatives are
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<variablelist>
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<varlistentry>
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<term><literal>suggest</literal> (or <literal>false</literal>)</term>
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<listitem><para>
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Use a very simple shell script to print suggested
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<command>systemctl</command> commands to run. You will have to
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manually run those commands after the switch.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>legacy</literal> (or <literal>true</literal>)</term>
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<listitem><para>
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Use a Ruby script to, in a more robust fashion, determine the
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necessary changes and automatically run the
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<command>systemctl</command> commands.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>sd-switch</literal></term>
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<listitem><para>
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Use sd-switch, a third party application, to perform the service
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updates. This tool offers more features while having a small
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closure size. Note, it requires a fully functional user D-Bus
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session. Once tested and deemed sufficiently robust, this will
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become the default.
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</para></listitem>
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</varlistentry>
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</variablelist>
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'';
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};
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servicesStartTimeoutMs = mkOption {
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default = 0;
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type = types.ints.unsigned;
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description = ''
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How long to wait for started services to fail until their start is
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considered successful. The value 0 indicates no timeout.
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'';
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};
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sessionVariables = mkOption {
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default = { };
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type = with types; attrsOf (either int str);
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example = { EDITOR = "vim"; };
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description = ''
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Environment variables that will be set for the user session.
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The variable values must be as described in
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<citerefentry>
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<refentrytitle>environment.d</refentrytitle>
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<manvolnum>5</manvolnum>
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</citerefentry>.
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'';
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};
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};
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};
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config = mkMerge [
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{
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assertions = [{
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assertion = enabled -> pkgs.stdenv.isLinux;
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message = let
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names = lib.concatStringsSep ", " (lib.attrNames ( # \
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cfg.services # \
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// cfg.slices # \
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// cfg.sockets # \
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// cfg.targets # \
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// cfg.timers # \
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// cfg.paths # \
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// cfg.mounts # \
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// cfg.sessionVariables));
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in "Must use Linux for modules that require systemd: " + names;
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}];
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}
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# If we run under a Linux system we assume that systemd is
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# available, in particular we assume that systemctl is in PATH.
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# Do not install any user services if username is root.
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(mkIf (pkgs.stdenv.isLinux && config.home.username != "root") {
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xdg.configFile = mkMerge [
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(lib.listToAttrs ((buildServices "service" cfg.services)
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++ (buildServices "slice" cfg.slices)
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++ (buildServices "socket" cfg.sockets)
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++ (buildServices "target" cfg.targets)
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++ (buildServices "timer" cfg.timers)
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++ (buildServices "path" cfg.paths)
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++ (buildServices "mount" cfg.mounts)
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++ (buildServices "automount" cfg.automounts)))
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sessionVariables
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];
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# Run systemd service reload if user is logged in. If we're
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# running this from the NixOS module then XDG_RUNTIME_DIR is not
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# set and systemd commands will fail. We'll therefore have to
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# set it ourselves in that case.
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home.activation.reloadSystemd = hm.dag.entryAfter [ "linkGeneration" ]
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(let
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cmd = {
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suggest = ''
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PATH=${dirOf cfg.systemctlPath}:$PATH \
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bash ${./systemd-activate.sh} "''${oldGenPath=}" "$newGenPath"
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'';
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legacy = ''
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PATH=${dirOf cfg.systemctlPath}:$PATH \
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${pkgs.ruby}/bin/ruby ${./systemd-activate.rb} \
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"''${oldGenPath=}" "$newGenPath" "${servicesStartTimeoutMs}"
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'';
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sd-switch = let
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timeoutArg = if cfg.servicesStartTimeoutMs != 0 then
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"--timeout " + servicesStartTimeoutMs
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else
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"";
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in ''
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${pkgs.sd-switch}/bin/sd-switch \
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''${DRY_RUN:+--dry-run} $VERBOSE_ARG ${timeoutArg} \
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''${oldGenPath:+--old-units $oldGenPath/home-files/.config/systemd/user} \
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--new-units $newGenPath/home-files/.config/systemd/user
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'';
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};
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ensureRuntimeDir =
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"XDG_RUNTIME_DIR=\${XDG_RUNTIME_DIR:-/run/user/$(id -u)}";
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systemctl = "${ensureRuntimeDir} ${cfg.systemctlPath}";
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in ''
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systemdStatus=$(${systemctl} --user is-system-running 2>&1 || true)
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if [[ $systemdStatus == 'running' || $systemdStatus == 'degraded' ]]; then
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if [[ $systemdStatus == 'degraded' ]]; then
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warnEcho "The user systemd session is degraded:"
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${systemctl} --user --no-pager --state=failed
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warnEcho "Attempting to reload services anyway..."
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fi
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${ensureRuntimeDir} \
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${getAttr cfg.startServices cmd}
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else
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echo "User systemd daemon not running. Skipping reload."
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fi
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unset systemdStatus
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'');
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})
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];
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}
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