From 3e12af7daa2d73666e6d826e633a787e4d813d40 Mon Sep 17 00:00:00 2001
From: Jordan Holt <jordan@vimium.com>
Date: Fri, 5 May 2023 20:23:24 +0100
Subject: [PATCH] Add helios configuration

---
 flake.nix                               |  9 ++++
 hosts/desktop.nix                       |  7 ++-
 hosts/helios/README.md                  | 33 +++++++++++++
 hosts/helios/default.nix                | 50 +++++++++++++++++++
 hosts/helios/hardware-configuration.nix | 65 +++++++++++++++++++++++++
 5 files changed, 163 insertions(+), 1 deletion(-)
 create mode 100644 hosts/helios/README.md
 create mode 100644 hosts/helios/default.nix
 create mode 100644 hosts/helios/hardware-configuration.nix

diff --git a/flake.nix b/flake.nix
index b106ac4..6b291d6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -50,6 +50,15 @@
           ];
           specialArgs = { inherit lib inputs; };
         };
+        helios = nixpkgs.lib.nixosSystem {
+          system = "x86_64-linux";
+          modules = [
+            inputs.home-manager.nixosModules.home-manager
+            (import ./modules)
+            ./hosts/helios
+          ];
+          specialArgs = { inherit lib inputs; };
+        };
       };
   };
 }
diff --git a/hosts/desktop.nix b/hosts/desktop.nix
index a85c66a..b5fb5d8 100644
--- a/hosts/desktop.nix
+++ b/hosts/desktop.nix
@@ -32,5 +32,10 @@ with lib.my;
     pulse.enable = true;
   };
 
+  environment.systemPackages = with pkgs; [
+    git
+    neovim
+  ];
+
   modules.desktop.gnome.enable = true;
-}
\ No newline at end of file
+}
diff --git a/hosts/helios/README.md b/hosts/helios/README.md
new file mode 100644
index 0000000..a832a1c
--- /dev/null
+++ b/hosts/helios/README.md
@@ -0,0 +1,33 @@
+# Helios
+
+## Overview
+Dell OptiPlex 980 small form factor desktop.
+
+## Specs
+* CPU - Intel Core i7-860 @ 2.8GHz
+* Memory - 8 GB DDR3
+* GPU - AMD FirePro 2460
+
+### Disks
+Device | Partitions _(filesystem, usage)_
+--- | ---
+SanDisk Ultra II | `/dev/sda1` (ext2, NixOS Boot) <br> `/dev/sda2` (ZFS, NixOS Root)
+
+#### ZFS pool layout
+```
+rpool/
+├── local
+│   ├── nix
+│   └── tmp
+├── system
+│   ├── root
+│   └── var
+└── user
+    └── home
+```
+
+See [Graham Christensen's article](https://grahamc.com/blog/nixos-on-zfs/#datasets) for the motivation behind these datasets.
+
+### Networks
+- DHCP on `192.168.0.0/32` subnet.
+- Tailscale on `100.64.0.0/10` subnet. FQDN: `helios.mesh.vimium.net`.
diff --git a/hosts/helios/default.nix b/hosts/helios/default.nix
new file mode 100644
index 0000000..9d39c89
--- /dev/null
+++ b/hosts/helios/default.nix
@@ -0,0 +1,50 @@
+{ config, lib, pkgs, ... }:
+
+with lib.my;
+{
+  imports = [
+    ./hardware-configuration.nix
+    ../desktop.nix
+  ];
+
+  boot.loader.grub.enable = true;
+  boot.loader.grub.version = 2;
+  boot.loader.grub.device = "/dev/sda";
+  boot.loader.grub.zfsSupport = true;
+
+  networking.hostName = "helios";
+  networking.hostId = "47d23505";
+  networking.networkmanager.enable = true;
+
+  nix.package = pkgs.nixFlakes;
+  nix.extraOptions = ''
+    experimental-features = nix-command flakes
+  '';
+
+  users.defaultUserShell = pkgs.zsh;
+
+  system.stateVersion = "22.11";
+
+  modules = {
+    desktop = {
+      apps.qbittorrent.enable = true;
+      browsers = {
+        firefox.enable = true;
+      };
+    };
+    dev = {
+      node.enable = true;
+    };
+    editors = {
+      neovim.enable = true;
+    };
+    security = {
+      gpg.enable = true;
+      pass.enable = true;
+    };
+    shell = {
+      git.enable = true;
+      zsh.enable = true;
+    };
+  };
+}
diff --git a/hosts/helios/hardware-configuration.nix b/hosts/helios/hardware-configuration.nix
new file mode 100644
index 0000000..f8bad89
--- /dev/null
+++ b/hosts/helios/hardware-configuration.nix
@@ -0,0 +1,65 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ehci_pci" "ahci" "usbhid" "usb_storage" "sd_mod" "sr_mod" "zfs" ];
+  boot.initrd.kernelModules = [ ];
+  boot.initrd.supportedFilesystems = [ "zfs" ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.kernelParams = [ "elevator=none" ];
+  boot.extraModulePackages = [ ];
+  boot.supportedFilesystems = [ "zfs" ];
+
+  fileSystems."/" =
+    { device = "rpool/system/root";
+      fsType = "zfs";
+    };
+
+  fileSystems."/home" =
+    { device = "rpool/user/home";
+      fsType = "zfs";
+    };
+
+  fileSystems."/nix" =
+    { device = "rpool/local/nix";
+      fsType = "zfs";
+    };
+
+  fileSystems."/tmp" =
+    { device = "rpool/local/tmp";
+      fsType = "zfs";
+    };
+
+  fileSystems."/var/log" =
+    { device = "rpool/system/var/log";
+      fsType = "zfs";
+    };
+
+  fileSystems."/var/tmp" =
+    { device = "rpool/system/var/tmp";
+      fsType = "zfs";
+    };
+
+  fileSystems."/boot" =
+    { device = "/dev/sda1";
+      fsType = "ext2";
+    };
+
+  swapDevices = [ ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.eno1.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}