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