129 lines
4.3 KiB
Nix
129 lines
4.3 KiB
Nix
# greetd source/docs:
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# - <https://git.sr.ht/~kennylevinsen/greetd>
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{ config, lib, pkgs, ... }:
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let
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systemd-cat = "${pkgs.systemd}/bin/systemd-cat";
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runWithLogger = identifier: cmd: pkgs.writeShellScriptBin identifier ''
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echo "launching ${identifier}..." | ${systemd-cat} --identifier=${identifier}
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${cmd} 2>&1 | ${systemd-cat} --identifier=${identifier}
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'';
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cfg = config.sane.gui.greetd;
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in
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{
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options = with lib; {
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sane.gui.greetd.enable = mkOption {
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default = false;
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type = types.bool;
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};
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sane.gui.greetd.session.command = mkOption {
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type = types.str;
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description = ''
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name to use for the default session in syslog.
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'';
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};
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sane.gui.greetd.session.name = mkOption {
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default = "greetd-session";
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type = types.str;
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description = "name of session to use in logger";
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};
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sane.gui.greetd.session.user = mkOption {
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default = null;
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type = types.nullOr types.str;
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};
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# helpers for common things to layer on top of greetd
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sane.gui.greetd.sway.enable = mkOption {
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default = false;
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type = types.bool;
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description = ''
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use sway as a wayland compositor in which to host a graphical greeter like gtkgreet, phog, etc.
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'';
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};
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sane.gui.greetd.sway.greeterCmd = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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command for sway to `exec` that provides the actual graphical greeter.
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'';
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};
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sane.gui.greetd.sway.gtkgreet.enable = mkOption {
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default = false;
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type = types.bool;
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description = ''
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have sway launch gtkgreet instead of directly presenting a desktop.
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'';
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};
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sane.gui.greetd.sway.gtkgreet.session.command = mkOption {
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type = types.str;
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description = ''
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command for gtkgreet to execute on successful authentication.
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'';
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};
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sane.gui.greetd.sway.gtkgreet.session.name = mkOption {
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type = types.str;
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description = ''
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name to use for the default session in syslog and in the gtkgreet menu.
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note that this `sessionName` will become a binary on the user's PATH.
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'';
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};
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sane.gui.greetd.sway.gtkgreet.session.user = mkOption {
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type = types.str;
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default = "colin";
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description = ''
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name of user which one expects to login as.
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'';
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};
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};
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config = lib.mkIf cfg.enable (lib.mkMerge [
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(lib.mkIf cfg.sway.enable {
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sane.gui.greetd.session = if cfg.sway.greeterCmd != null then {
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name = "sway-as-greeter";
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command = let
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swayAsGreeterConfig = pkgs.writeText "sway-as-greeter-config" ''
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exec ${cfg.sway.greeterCmd}
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'';
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in "${pkgs.sway}/bin/sway --debug --config ${swayAsGreeterConfig}";
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} else {
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name = "sway";
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user = lib.mkDefault "colin";
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command = "${pkgs.sway}/bin/sway --debug";
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};
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})
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(lib.mkIf cfg.sway.gtkgreet.enable (
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let
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inherit (cfg.sway.gtkgreet) session;
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sessionProvider = runWithLogger session.name session.command;
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in {
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# gtkgreet shows the --command argument in the UI
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# - so we want it to look nice (not a /nix/store/... path)
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# - to do that we put it in the user's PATH.
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sane.gui.greetd.sway.greeterCmd = "${pkgs.greetd.gtkgreet}/bin/gtkgreet --layer-shell --command ${session.name}";
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users.users.${session.user}.packages = [ sessionProvider ];
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}
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))
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{
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services.greetd = {
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enable = true;
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# i could have gtkgreet launch the session directly: but stdout/stderr gets dropped
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# settings.default_session.command = cfg.session.command;
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# wrapper to launch with stdout/stderr redirected to system journal.
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settings.default_session.command = let
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launchWithLogger = runWithLogger cfg.session.name cfg.session.command;
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in "${launchWithLogger}/bin/${cfg.session.name}";
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};
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# persisting fontconfig & mesa_shader_cache improves start time by ~5x
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users.users.greeter.home = "/var/lib/greeter";
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sane.persist.sys.byStore.plaintext = [
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{ user = "greeter"; group = "greeter"; path = "/var/lib/greeter/.cache/fontconfig"; }
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{ user = "greeter"; group = "greeter"; path = "/var/lib/greeter/.cache/mesa_shader_cache"; }
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];
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}
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]);
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}
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