feat: Adds workflow for NixOS build

.github/workflows/kiosk-iso.yml

@@ -0,0 +1,43 @@
+name: Build NixOS Kiosk ISO
+
+on:
+  push:
+    branches: [ main, profile-install ]
+  workflow_dispatch:
+
+jobs:
+  flake-check:
+    runs-on: ubuntu-latest
+    container:
+      image: nixos/nix:2.33.0
+    env:
+      NIX_CONFIG: extra-experimental-features = nix-command flakes
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Flake check
+        run: nix flake check -L
+
+  build-iso:
+    runs-on: ubuntu-latest
+    needs: [ flake-check ]
+    container:
+      image: nixos/nix:2.33.0
+    env:
+      NIX_CONFIG: extra-experimental-features = nix-command flakes
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build ISO
+        run: |
+          nix --version
+          nix build .#iso -L --system x86_64-linux
+          ls -la result
+          mkdir -p artifacts
+          cp -v result/iso/*.iso artifacts/
+      - name: Upload ISO artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: kiosk-iso
+          path: artifacts/*.iso
+          if-no-files-found: error

flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1751274312,
+        "narHash": "sha256-/bVBlRpECLVzjV19t5KMdMFWSwKLtb5RyXdjz3LJT+g=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "50ab793786d9de88ee30ec4e4c24fb4236fc2674",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,28 @@
+{
+  description = "Kiosk NixOS ISO with Firefox in kiosk mode";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system: {
+      # Build a bootable ISO image using the built-in NixOS iso module
+      packages.iso = (
+        (nixpkgs.lib.nixosSystem {
+          system = "x86_64-linux";
+          modules = [
+            ./nixos/kiosk.nix
+            (import "${nixpkgs}/nixos/modules/installer/cd-dvd/iso-image.nix")
+          ];
+        }).config.system.build.isoImage
+      );
+
+      # Expose the NixOS configuration for direct use if desired
+      nixosConfigurations.kiosk = (nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        modules = [ ./nixos/kiosk.nix ];
+      });
+    });
+}

nixos/kiosk.nix

@@ -0,0 +1,151 @@
+{ config, pkgs, lib, ... }:
+
+{
+  ############################################
+  # Base system
+  ############################################
+  nixpkgs.hostPlatform = "x86_64-linux";
+  system.stateVersion = "24.11";
+
+  # Simple console-based kiosk using cage (Wayland single-app compositor)
+  services.xserver.enable = false; # Not using an X11 display manager
+
+  # Autologin to TTY1 as kiosk user
+  services.getty.autologinUser = "kiosk";
+
+  # Kiosk user
+  users.users.kiosk = {
+    isNormalUser = true;
+    description = "Kiosk User";
+    home = "/home/kiosk";
+    extraGroups = [ "wheel" ];
+    initialPassword = "kiosk";
+  };
+
+  # Packages required (aligning with the Debian preseed intent)
+  environment.systemPackages = with pkgs; [
+    firefox
+    cage
+    curl
+    unzip
+    # chromium # available if you want it in addition to Firefox
+  ];
+
+  ############################################
+  # Firefox policies (preconfigured profile settings)
+  ############################################
+  programs.firefox = {
+    enable = true;
+    policies = {
+      DisableDeveloperTools = true;
+      BlockAboutAddons = true;
+      BlockAboutConfig = true;
+      BlockAboutProfiles = true;
+      BlockAboutSupport = true;
+      DisableFirefoxAccounts = true;
+      DisablePrivateBrowsing = true;
+      DisableProfileImport = true;
+      DisableProfileRefresh = true;
+      DisableSafeMode = true;
+      DisablePocket = true;
+      DisableFirefoxScreenshots = true;
+      DisableSetDesktopBackground = true;
+
+      Homepage = {
+        URL = "https://mahn.ke";
+        Locked = true;
+      };
+
+      NewTabPage = { Enabled = false; };
+
+      # Use a Linux path for downloads in kiosk
+      DownloadDirectory = {
+        Path = "/home/kiosk/Downloads";
+        Locked = true;
+      };
+
+      PromptForDownloadLocation = false;
+      StartDownloadsInTempDirectory = false;
+      DisableAppUpdate = true;
+
+      Permissions = {
+        Camera = "deny";
+        Microphone = "deny";
+        Location = "deny";
+        Notifications = "deny";
+      };
+
+      ShowHomeButton = false;
+      DisplayMenuBar = false;
+      DisplayBookmarksToolbar = false;
+
+      # Extension & user messaging controls (per your Debian policy JSON)
+      UserMessaging = {
+        ExtensionRecommendations = false;
+        FeatureRecommendations = false;
+        UrlbarInterventions = false;
+        SkipOnboarding = false;
+        MoreFromMozilla = false;
+        FirefoxLabs = false;
+        Locked = false;
+      };
+
+      # Install Tampermonkey automatically (Firefox will fetch at runtime).
+      # Note: AMO URL may change; this is the typical latest channel.
+      Extensions = {
+        Install = [
+          "https://addons.mozilla.org/firefox/downloads/latest/tampermonkey/latest.xpi"
+        ];
+      };
+    };
+
+    # Helpful preferences to keep Firefox minimal
+    preferences = {
+      "browser.fullscreen.autohide" = true;
+      "browser.shell.checkDefaultBrowser" = false;
+      "browser.startup.page" = 1; # Start with homepage
+    };
+  };
+
+  ############################################
+  # Kiosk launch behavior (replicates your bash_profile approach)
+  ############################################
+  # Create a bash_profile for the kiosk user that launches cage + firefox
+  system.activationScripts.kioskBashProfile = lib.stringAfter ["users"] ''
+    mkdir -p /home/kiosk
+    chown kiosk:kiosk /home/kiosk
+    sudo -u kiosk mkdir -p /home/kiosk/.config
+    cat > /home/kiosk/.bash_profile <<'EOF'
+if [ -z "$WAYLAND_DISPLAY" ] && [ "$(tty)" = "/dev/tty1" ]; then
+    exec ${pkgs.cage}/bin/cage ${pkgs.firefox}/bin/firefox --kiosk https://c3nav.de
+fi
+EOF
+    chown kiosk:kiosk /home/kiosk/.bash_profile
+  '';
+
+  # Unpack preconfigured Firefox profile from the repository into kiosk's home
+  system.activationScripts.kioskFirefoxProfile = lib.stringAfter ["users"] ''
+    mkdir -p /home/kiosk/.mozilla/firefox
+    # Only unzip if directory is empty (first activation)
+    if [ -z "$(ls -A /home/kiosk/.mozilla/firefox 2>/dev/null)" ]; then
+      ${pkgs.unzip}/bin/unzip -o ${../Firefox.zip} -d /home/kiosk/.mozilla/firefox
+      chown -R kiosk:kiosk /home/kiosk/.mozilla/firefox
+    fi
+  '';
+
+  ############################################
+  # Include your userscripts in the image for easy import
+  ############################################
+  environment.etc."kiosk/tampermonkey".source = ./../tampermonkey;
+
+  ############################################
+  # Networking & basic services
+  ############################################
+  networking.hostName = "kiosk";
+  time.timeZone = "UTC";
+  services.openssh.enable = true; # optional, mirrors preseed tasksel ssh-server
+
+
+  # Keep system simple, disable unneeded DM
+  services.displayManager.enable = false;
+}

post_install.sh

@@ -60,3 +60,9 @@ if [ -z "$WAYLAND_DISPLAY" ] && [ "$(tty)" = "/dev/tty1" ]; then
     exec cage firefox --kiosk https://c3nav.de
 fi
 EOF
+
+mkdir -p /home/kiosk/.mozilla/firefox
+curl -fsSL -o /tmp/Firefox.zip "https://git.hamburg.ccc.de/Firefox.zip"
+unzip -o /tmp/Firefox.zip -d /home/kiosk/.mozilla/firefox
+chown -R kiosk:kiosk /home/kiosk/.mozilla/firefox
+rm -f /tmp/Firefox.zip

preseed.cfg

@@ -53,6 +53,7 @@ d-i pkgsel/include string \
     sudo \
     cage \
     firefox-esr \
+    unzip \
     curl
 
 d-i pkgsel/exclude string gnome-software
@@ -64,4 +65,4 @@ d-i finish-install/reboot_in_progress note
 d-i preseed/late_command string \
     in-target curl -o /tmp/post_install.sh https://git.hamburg.ccc.de/ViMaSter/preseed/raw/branch/main/post_install.sh; \
     in-target chmod +x /tmp/post_install.sh; \
-    in-target /tmp/post_install.sh
+    in-target /tmp/post_install.sh;

tampermonkey/backtohome.js

@@ -9,22 +9,31 @@
 // @grant        GM_addStyle
 // ==/UserScript==
 
+const target = "https://kiosk.39c3.by.vincent.mahn.ke/";
 (function() {
     'use strict';
 
+    // if the user is on target already or subdomain, do nothing
+    if (window.location.href === target || window.location.href.startsWith(target + '/')) {
+        return;
+    }
+
     const btn = document.createElement('button');
     btn.textContent = 'Home';
     btn.style.cssText = '     all: unset; box-sizing: border-box; border: 2px solid #141414; background: #faf5f5; text-align: center; color: #141414;  position: fixed;    right: 10px;    bottom: 10px;    width: 60px;    height: 60px;    z-index: 2147483647;    padding-top: 6px;    border-radius: 60px;';
     btn.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-house-icon lucide-house"><path d="M15 21v-8a1 1 0 0 0-1-1h-4a1 1 0 0 0-1 1v8"/><path d="M3 10a2 2 0 0 1 .709-1.528l7-6a2 2 0 0 1 2.582 0l7 6A2 2 0 0 1 21 10v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/></svg>';
     btn.addEventListener('click', () => {
-      window.location.href = 'http://127.0.0.1:8080';
+      window.location.href = target;
     });
     (document.body || document.documentElement).appendChild(btn);
 
 
-    const IDLE_LIMIT_MS = 30_000; // 30 seconds
+    const IDLE_LIMIT_MS = 60_000;
     let idleTimer = null;
     let promptVisible = false;
+    const PROMPT_LIMIT_MS = 30_000;
+    let promptInterval = null;
+    let promptTimeout = null;
 
     const modal = document.createElement('div');
     modal.id = 'idle-modal';
@@ -46,6 +55,7 @@
       <p>Do you want to stay on this page or go back to the home page?</p>
       <button id="idle-stay">Stay</button>
       <button id="idle-go">Go to Home</button>
+      <p id="idle-countdown-msg" style="margin-top:8px">Auto return in <span id="idle-countdown">30</span>s</p>
     `;
     document.body.appendChild(modal);
 
@@ -76,21 +86,57 @@
       promptVisible = true;
       modal.hidden = false;
       backdrop.hidden = false;
-      debugger;
+
-      // Move focus to the primary action for accessibility
+      // Clear any previous prompt timers
-        document.querySelector("#idle-stay").addEventListener("click", () => {
+      if (promptInterval) { clearInterval(promptInterval); promptInterval = null; }
+      if (promptTimeout) { clearTimeout(promptTimeout); promptTimeout = null; }
+
+      // Wire button actions (once to avoid duplicates)
+      const stayBtn = document.querySelector("#idle-stay");
+      const goBtn = document.querySelector("#idle-go");
+
+      if (stayBtn) {
+        stayBtn.addEventListener("click", () => {
           hidePrompt();
           resetIdleTimer();
-      });
+        }, { once: true });
-        document.querySelector("#idle-go").addEventListener("click", () => {
+      }
-          window.location.href = 'https://www.google.com';
+
-      });
+      if (goBtn) {
+        goBtn.addEventListener("click", () => {
+          window.location.href = target;
+        }, { once: true });
+      }
+
+      // 30s countdown visible to the user
+      let remaining = PROMPT_LIMIT_MS / 1000; // seconds
+      const countdownEl = document.querySelector("#idle-countdown");
+      if (countdownEl) countdownEl.textContent = String(remaining);
+
+      promptInterval = setInterval(() => {
+        remaining -= 1;
+        if (remaining >= 0 && countdownEl) {
+          countdownEl.textContent = String(remaining);
+        }
+      }, 1000);
+
+      // Auto-go when expired
+      promptTimeout = setTimeout(() => {
+        const go = document.querySelector("#idle-go");
+        if (go) {
+          go.click();
+        } else {
+          window.location.href = target;
+        }
+      }, PROMPT_LIMIT_MS);
     }
 
     function hidePrompt() {
       promptVisible = false;
       modal.hidden = true;
       backdrop.hidden = true;
+      if (promptInterval) { clearInterval(promptInterval); promptInterval = null; }
+      if (promptTimeout) { clearTimeout(promptTimeout); promptTimeout = null; }
     }
 
     function onIdle() {