From 5339e045194c5ad482250c0271959a5fd9f97db2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Sun, 2 Jan 2022 17:23:58 +0100
Subject: nios: Add sentinel module

---
 nixos/modules/turris-board.nix | 95 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 nixos/modules/turris-board.nix

(limited to 'nixos/modules/turris-board.nix')

diff --git a/nixos/modules/turris-board.nix b/nixos/modules/turris-board.nix
new file mode 100644
index 0000000..4b8aa0d
--- /dev/null
+++ b/nixos/modules/turris-board.nix
@@ -0,0 +1,95 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+
+  options = {
+    turris.board = mkOption {
+      type = types.enum [ "omnia" "mox" ];
+      description = "The unique Turris board identifier.";
+    };
+
+    turris.device = mkOption {
+      type = types.str;
+      example = "/dev/mmcblk0";
+      description = "The device used to boot the Turris system.";
+    };
+  };
+
+  config = {
+    assertions = [{
+      assertion = config.turris.board != null;
+      message = "Turris board has to be specified";
+    }];
+
+    # We do not need Grub as U-Boot supports boot using extlinux like file
+    boot.loader.grub.enable = false;
+    boot.loader.generic-extlinux-compatible.enable = true;
+    # Use early print to the serial console
+    boot.kernelParams = [
+      "earlyprintk" "console=ttyMV0,115200" "earlycon=ar3700_uart,0xd0012000"
+      "boot.shell_on_fail"
+    ];
+
+    # Use the latest kernel
+    boot.kernelPackages = pkgs.linuxPackages_latest;
+
+    # The supported deployment is on BTRFS
+    boot.supportedFilesystems = [ "btrfs" ];
+
+    # Cover nix memory consumption peaks by compressing the RAM
+    zramSwap = {
+      enable = true;
+      memoryPercent = 100;
+    };
+    # Nix is really memory hungry so we have to sometimes also use swap device.
+    # We expect that to be the second partition on the root device.
+    swapDevices = [{
+      device = config.turris.device + "p2";
+      priority = 0;
+    }];
+
+    fileSystems = {
+      # Root filesystem is expected to be on:
+      # Mox: SD card
+      # Omnia: internam MMC storage
+      "/" = {
+        device = config.turris.device + "p1";
+        fsType = "btrfs";
+      };
+    };
+
+    # The default hostname
+    # TODO set this only if not already set
+    networking.hostName = "nixturris";
+
+    # Enable flakes for nix as we are using that instead of legacy setup
+    nix = {
+      package = pkgs.nixFlakes;
+      extraOptions = "experimental-features = nix-command flakes";
+    };
+
+    # Allow root access over SSH
+    # TODO allow disable as it is nice only for initial setup
+    services.openssh = {
+      enable = true;
+      passwordAuthentication = true;
+      permitRootLogin = "yes";
+    };
+
+    # Set default editor
+    # TODO probably switch to nano later on
+    programs.vim.defaultEditor = true;
+
+    # The additional administration packages
+    environment.systemPackages =  with pkgs; [
+      (pkgs.nixos-rebuild.override { nix = config.nix.package.out; })
+      git # This is required to access the repository
+      htop
+    ];
+
+    # No need for installer tools in standard system
+    system.disableInstallerTools = true;
+  };
+}
-- 
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