From e8e3b46207b6295671be4872b161316f8e30e289 Mon Sep 17 00:00:00 2001
From: Samuel Dionne-Riel <samuel@dionne-riel.com>
Date: Tue, 24 Sep 2019 22:57:43 -0400
Subject: [PATCH] examples/demo: inits a demo configuration for a system

---
 examples/demo/configuration.nix | 107 ++++++++++++++++++++++++++++++++
 examples/demo/default.nix       |   5 ++
 2 files changed, 112 insertions(+)
 create mode 100644 examples/demo/configuration.nix

diff --git a/examples/demo/configuration.nix b/examples/demo/configuration.nix
new file mode 100644
index 00000000..d45d5b82
--- /dev/null
+++ b/examples/demo/configuration.nix
@@ -0,0 +1,107 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) mkForce;
+in
+  {
+    imports = [
+      ../../profiles/installer.nix
+    ];
+    disabledModules = [
+      <nixpkgs/nixos/modules/installer/cd-dvd/iso-image.nix>
+      <nixpkgs/nixos/modules/installer/cd-dvd/installation-cd-base.nix>
+    ];
+
+  config = lib.mkMerge [
+    {
+
+      services.xserver = {
+        enable = true;
+
+        libinput.enable = true;
+        videoDrivers = [ "fbdev" ];
+
+        # xfce has been chosen mainly because it is light, and quick to start.
+        # FIXME: Find a better demo environment.
+        desktopManager.xfce.enable = true;
+
+        # Automatically login as nixos.
+        displayManager.slim = {
+          enable = true;
+          defaultUser = "nixos";
+          autoLogin = true;
+        };
+
+      };
+
+      powerManagement.enable = true;
+      hardware.pulseaudio.enable = true;
+
+      environment.systemPackages = with pkgs; [
+        firefox
+        sgtpuzzles
+        hard-reboot
+        hard-shutdown
+      ];
+
+      # Hacky way to setup an initial brightness
+      # TODO: better factor this out...
+      mobile.boot.stage-1.initFramebuffer = ''
+        brightness=10
+        echo "Setting brightness to $brightness"
+        if [ -e /sys/class/backlight/backlight/brightness ]; then
+          echo $(($(cat /sys/class/backlight/backlight/max_brightness) * brightness / 100)) > /sys/class/backlight/backlight/brightness
+        elif [ -e /sys/class/leds/lcd-backlight/max_brightness ]; then
+          echo $(($(cat /sys/class/leds/lcd-backlight/max_brightness)  * brightness / 100)) > /sys/class/leds/lcd-backlight/brightness
+        elif [ -e /sys/class/leds/lcd-backlight/brightness ]; then
+          # Assumes max brightness is 100... probably wrong, but good enough, eh.
+          echo $brightness > /sys/class/leds/lcd-backlight/brightness
+        fi
+      '';
+
+      # Puts some icons on the desktop.
+      system.activationScripts.fillDesktop = let
+        minesDesktopFile = pkgs.writeScript "mines.desktop" ''
+          [Desktop Entry]
+          Version=1.0
+          Type=Application
+          Name=Mines
+          Exec=${pkgs.sgtpuzzles}/bin/sgt-puzzle-mines
+        '';
+
+        homeDir = "/home/nixos/";
+        desktopDir = homeDir + "Desktop/";
+
+      in ''
+        mkdir -p ${desktopDir}
+        chown nixos ${homeDir} ${desktopDir}
+
+        ln -sfT ${minesDesktopFile} ${desktopDir + "mines.desktop"}
+      '';
+
+      # FIXME : Stop relying on initrd for `ssh` via USB.
+      networking.networkmanager.enable = true;
+      networking.networkmanager.unmanaged = [ "rndis0" "usb0" ];
+
+      # Setup USB gadget networking in initrd...
+      mobile.boot.stage-1.networking.enable = true;
+      #mobile.boot.stage-1.ssh.enable = true;
+
+      # Start SSH by default...
+      systemd.services.sshd.wantedBy = lib.mkOverride 10 [ "multi-user.target" ];
+      services.openssh.permitRootLogin = lib.mkForce "yes";
+
+      # Forcibly set a password on users...
+      # FIXME: highly insecure!
+      # FIXME: Figure out why this breaks...
+      #services.openssh.extraConfig = "PermitEmptyPasswords yes";
+      users.users.nixos.password = "nixos";
+      users.users.root.password = "nixos";
+
+      # Okay, systemd-udev-settle times out... no idea why yet...
+      # Though, it seems fine to simply disable it.
+      # FIXME : figure out why systemd-udev-settle doesn't work.
+      systemd.services.systemd-udev-settle.enable = false;
+    }
+  ];
+}
diff --git a/examples/demo/default.nix b/examples/demo/default.nix
index 9e465a35..469f5aac 100644
--- a/examples/demo/default.nix
+++ b/examples/demo/default.nix
@@ -1,10 +1,15 @@
 { device ? null }:
 let
+  system-build = import ../../. {
+    inherit device;
+    configuration = [ (import ./configuration.nix) ];
+  };
   burn-tool-build = import ../../. {
     inherit device;
     configuration = [ (import ./android-burn-tool.nix) ];
   };
 in
   {
+    inherit (system-build.build) android-bootimg android-device;
     android-burn-tool = burn-tool-build.build.android-bootimg;
   }