113 lines
3.2 KiB
Nix
113 lines
3.2 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.cage;
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in {
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options.services.cage.enable = mkEnableOption "cage kiosk service";
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options.services.cage.user = mkOption {
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type = types.str;
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default = "demo";
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description = ''
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User to log-in as.
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'';
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};
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options.services.cage.extraArguments = mkOption {
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type = types.listOf types.str;
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default = [];
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defaultText = literalExpression "[]";
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description = "Additional command line arguments to pass to Cage.";
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example = ["-d"];
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};
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options.services.cage.environment = mkOption {
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type = types.attrsOf types.str;
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default = {};
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example = {
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WLR_LIBINPUT_NO_DEVICES = "1";
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};
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description = "Additional environment variables to pass to Cage.";
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};
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options.services.cage.program = mkOption {
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type = types.path;
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default = "${pkgs.xterm}/bin/xterm";
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defaultText = literalExpression ''"''${pkgs.xterm}/bin/xterm"'';
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description = ''
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Program to run in cage.
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'';
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};
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config = mkIf cfg.enable {
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# The service is partially based off of the one provided in the
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# cage wiki at
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# https://github.com/Hjdskes/cage/wiki/Starting-Cage-on-boot-with-systemd.
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systemd.services."cage-tty1" = {
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enable = true;
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after = [
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"systemd-user-sessions.service"
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"plymouth-start.service"
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"plymouth-quit.service"
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"systemd-logind.service"
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"getty@tty1.service"
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];
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before = [ "graphical.target" ];
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wants = [ "dbus.socket" "systemd-logind.service" "plymouth-quit.service"];
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wantedBy = [ "graphical.target" ];
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conflicts = [ "getty@tty1.service" ];
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restartIfChanged = false;
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unitConfig.ConditionPathExists = "/dev/tty1";
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serviceConfig = {
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ExecStart = ''
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${pkgs.cage}/bin/cage \
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${escapeShellArgs cfg.extraArguments} \
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-- ${cfg.program}
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'';
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User = cfg.user;
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IgnoreSIGPIPE = "no";
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# Log this user with utmp, letting it show up with commands 'w' and
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# 'who'. This is needed since we replace (a)getty.
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UtmpIdentifier = "%n";
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UtmpMode = "user";
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# A virtual terminal is needed.
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TTYPath = "/dev/tty1";
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TTYReset = "yes";
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TTYVHangup = "yes";
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TTYVTDisallocate = "yes";
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# Fail to start if not controlling the virtual terminal.
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StandardInput = "tty-fail";
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StandardOutput = "journal";
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StandardError = "journal";
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# Set up a full (custom) user session for the user, required by Cage.
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PAMName = "cage";
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};
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environment = cfg.environment;
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};
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security.polkit.enable = true;
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security.pam.services.cage.text = ''
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auth required pam_unix.so nullok
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account required pam_unix.so
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session required pam_unix.so
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session required pam_env.so conffile=/etc/pam/environment readenv=0
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session required ${config.systemd.package}/lib/security/pam_systemd.so
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'';
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hardware.graphics.enable = mkDefault true;
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systemd.targets.graphical.wants = [ "cage-tty1.service" ];
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systemd.defaultUnit = "graphical.target";
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};
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meta.maintainers = with lib.maintainers; [ matthewbauer ];
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}
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