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application.nix
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application.nix
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rec {
fullProductName = "Dividat PlayOS";
safeProductName = "playos";
version = "2024.7.0";
greeting = label: ''
_
, -"" "".
,' ____ `.
,' ,' `. `._
(`. _..--.._ ,' ,' \\ \\
(`-.\\ .-"" ""' / ( d _b
(`._ `-"" ,._ ( `-( \\
<_ ` ( <`< \\ `-._\\
<`- (__< < : ${label}
(__ (_<_< ;
-----`------------------------------------------------------ ----------- ------- ----- --- -- -
'';
overlays = [
(import ./application/overlays version)
];
module = { config, lib, pkgs, ... }: {
imports = [
./application/playos-status.nix
./application/power-management/default.nix
./application/limit-vtes.nix
];
# Kiosk runs as a non-privileged user
users.users.play = {
isNormalUser = true;
home = "/home/play";
extraGroups = [
"dialout" # Access to serial ports for the Senso flex
];
};
# Note that setting up "/home" as persistent fails due to https://github.com/NixOS/nixpkgs/issues/6481
playos.storage.persistentFolders."/home/play" = {
mode = "0700";
user = "play";
group = "users";
};
# Limit virtual terminals that can be switched to
# Virtual terminal 7 is the kiosk, 8 is the status screen
playos.xserver.activeVirtualTerminals = [ 7 8 ];
# System-wide packages
environment.systemPackages = with pkgs; [ breeze-contrast-cursor-theme ];
# Kiosk session
services.xserver = let sessionName = "kiosk-browser";
in {
enable = true;
desktopManager = {
xterm.enable = false;
session = [{
name = sessionName;
start = ''
# Disable screen-saver control (screen blanking)
xset s off
xset s noblank
xset -dpms
# Localization for xsession
if [ -f /var/lib/gui-localization/lang ]; then
export LANG=$(cat /var/lib/gui-localization/lang)
fi
if [ -f /var/lib/gui-localization/keymap ]; then
setxkbmap $(cat /var/lib/gui-localization/keymap) || true
fi
# Set preferred screen resolution
scaling_pref=$(cat /var/lib/gui-localization/screen-scaling 2>/dev/null || echo "default")
case "$scaling_pref" in
"default" | "full-hd")
xrandr --size 1920x1080;;
"native")
# Nothing to do, let system decide.
;;
*)
echo "Unknown scaling preference '$scaling_pref'. Ignoring."
;;
esac
# Enable Qt WebEngine Developer Tools (https://doc.qt.io/qt-5/qtwebengine-debugging.html)
export QTWEBENGINE_REMOTE_DEBUGGING="127.0.0.1:3355"
${pkgs.playos-kiosk-browser}/bin/kiosk-browser \
${config.playos.kioskUrl} \
http://localhost:3333/
waitPID=$!
'';
}];
};
displayManager = {
# Always automatically log in play user
lightdm = {
enable = true;
greeter.enable = false;
autoLogin.timeout = 0;
};
autoLogin = {
enable = true;
user = "play";
};
defaultSession = sessionName;
sessionCommands = ''
${pkgs.xorg.xrdb}/bin/xrdb -merge <<EOF
Xcursor.theme: ${pkgs.breeze-contrast-cursor-theme.themeName}
EOF
'';
};
};
# Firewall configuration
networking.firewall = {
enable = true;
# Allow use of TFTP client for Senso firmware update
connectionTrackingModules = [ "tftp" ];
extraCommands = ''
iptables --table raw --append OUTPUT --protocol udp --dport 69 --jump CT --helper tftp
'';
};
# Driver service
systemd.services."dividat-driver" = {
description = "Dividat Driver";
# Run driver with permissible origin limited to the origin of the kiosk URL
serviceConfig.ExecStart = ''
/bin/sh -c '${pkgs.dividat-driver}/bin/dividat-driver --permissible-origin $(echo "${config.playos.kioskUrl}" | grep -oP "^[^:]+://[^/]+")'
'';
serviceConfig.User = "play";
wantedBy = [ "multi-user.target" ];
};
# Audio
sound.enable = true;
hardware.pulseaudio = {
enable = true;
extraConfig = ''
# Use HDMI output
set-card-profile 0 output:hdmi-stereo
# Respond to changes in connected outputs
load-module module-switch-on-port-available
load-module module-switch-on-connect
'';
};
# Enable avahi for Senso discovery
services.avahi.enable = true;
# Enable pcscd for smart card identification
services.pcscd.enable = true;
# Blacklist NFC modules conflicting with CCID (https://ludovicrousseau.blogspot.com/2013/11/linux-nfc-driver-conflicts-with-ccid.html)
boot.blacklistedKernelModules = [ "pn533_usb" "pn533" "nfc" ];
# Allow play user to access pcsc
security.polkit.extraConfig = ''
polkit.addRule(function(action, subject) {
if (subject.user == "play" && (action.id == "org.debian.pcsc-lite.access_pcsc" || action.id == "org.debian.pcsc-lite.access_card")) {
return polkit.Result.YES;
}
});
'';
playos.remoteMaintenance = {
enable = true;
network = "a09acf02330ccc60";
authorizedKeys = [
"ssh-rsa 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 openpgp:0x01C16138"
"ssh-rsa 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 openpgp:0xEC33A79F"
];
};
# Enable persistent journaling with low maximum size
playos.storage.persistentFolders."/var/log/journal" = {
mode = "0755";
user = "root";
group = "root";
};
services.journald.extraConfig = ''
Storage=persistent
SystemMaxUse=1G
'';
# Set a low default timeout when stopping services, to prevent the Windows 95 shutdown experience
systemd.extraConfig = "DefaultTimeoutStopSec=15s";
playos.hardening.enable = true;
};
}