feat: add hosts/aijiro config

My portable desktop machine.

hosts/aijiro/README.org

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+#+TITLE: Aijiro
+#+DATE:  September 3, 2021
+
+* Overview
+...
+
+* Specs
++ Intel i5-6400
++ 8GB
+
+* Installation
+** Set up root file system
+#+BEGIN_SRC sh
+parted /dev/sda -- mklabel gpt
+parted /dev/sda -- mkpart ESP fat32 1MiB 512MiB
+parted /dev/sda -- mkpart primary linux-swap 512MiB 8.5GiB
+parted /dev/sda -- mkpart primary 8.5GiB 100%
+parted /dev/sda -- set 1 boot on
+mkfs.fat -F32 -n BOOT /dev/sda1
+mkswap -L swap /dev/sda2
+mkfs.ext4 -L nixos /dev/sda3
+#+END_SRC
+
+** Mount drives
+#+BEGIN_SRC sh
+mount /dev/sda3 /mnt
+mkdir -p /mnt/boot
+mount /dev/sda1 /mnt/boot
+swapon /dev/sda2
+#+END_SRC

hosts/aijiro/default.nix

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+# Shiro -- my laptop
+
+{ ... }:
+{
+  imports = [
+    ../home.nix
+    ./hardware-configuration.nix
+  ];
+
+  ## Modules
+  modules = {
+    desktop = {
+      bspwm.enable = true;
+      apps = {
+        discord.enable = true;
+        rofi.enable = true;
+        # godot.enable = true;
+      };
+      browsers = {
+        default = "brave";
+        brave.enable = true;
+        # firefox.enable = true;
+        # qutebrowser.enable = true;
+      };
+      gaming = {
+        # steam.enable = true;
+        # emulators.enable = true;
+        # emulators.psx.enable = true;
+      };
+      media = {
+        daw.enable = true;
+        documents.enable = true;
+        graphics.enable = true;
+        mpv.enable = true;
+        recording.enable = true;
+        spotify.enable = true;
+      };
+      term = {
+        default = "xst";
+        st.enable = true;
+      };
+      vm = {
+        qemu.enable = true;
+      };
+    };
+    dev = {
+      node.enable = true;
+      rust.enable = true;
+      python.enable = true;
+    };
+    editors = {
+      default = "nvim";
+      emacs.enable = true;
+      vim.enable = true;
+    };
+    shell = {
+      # adl.enable = true;
+      vaultwarden.enable = true;
+      direnv.enable = true;
+      git.enable    = true;
+      gnupg.enable  = true;
+      tmux.enable   = true;
+      zsh.enable    = true;
+    };
+    services = {
+      ssh.enable = true;
+      docker.enable = true;
+      # Needed occasionally to help the parental units with PC problems
+      # teamviewer.enable = true;
+    };
+    theme.active = "alucard";
+  };
+
+
+  ## Local config
+  programs.ssh.startAgent = true;
+  services.openssh.startWhenNeeded = true;
+
+  networking.networkmanager.enable = true;
+  # The global useDHCP flag is deprecated, therefore explicitly set to false
+  # here. Per-interface useDHCP will be mandatory in the future, so this
+  # generated config replicates the default behaviour.
+  networking.useDHCP = false;
+
+  time.timeZone = "Europe/Copenhagen";
+}

hosts/aijiro/hardware-configuration.nix

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+{ config, lib, pkgs, inputs, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  boot = {
+    initrd.availableKernelModules = [ "xhci_pci" "ahci" "usb_storage" "usbhid" "sd_mod" "sr_mod" "nvme" ];
+    initrd.kernelModules = [ "dm-snapshot" ];
+    kernelModules = [ "kvm-intel" ];
+    extraModulePackages = [ ];
+    kernelParams = [
+      # HACK Disables fixes for spectre, meltdown, L1TF and a number of CPU
+      #      vulnerabilities. Don't copy this blindly! And especially not for
+      #      mission critical or server/headless builds exposed to the world.
+      "mitigations=off"
+    ];
+
+    # Refuse ICMP echo requests on my desktop/laptop; nobody has any business
+    # pinging them, unlike my servers.
+    kernel.sysctl."net.ipv4.icmp_echo_ignore_broadcasts" = 1;
+  };
+
+  # Modules
+  modules.hardware = {
+    audio.enable = true;
+    fs = {
+      enable = true;
+      ssd.enable = true;
+    };
+  };
+
+  # CPU
+  nix.maxJobs = lib.mkDefault 4;
+  hardware.cpu.intel.updateMicrocode = true;
+  # performance gives better battery life/perf than ondemand on sandy bridge and
+  # newer because of intel pstates.
+  powerManagement.cpuFreqGovernor = "performance";
+  # Without this wpa_supplicant may fail to auto-discover wireless interfaces at
+  # startup (and must be restarted).
+  networking.wireless.interfaces = [ "wlp3s0" ];
+
+  # Storage
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-label/nixos";
+      fsType = "ext4";
+      options = [ "noatime" ];
+    };
+    "/boot" = {
+      device = "/dev/disk/by-label/BOOT";
+      fsType = "vfat";
+    };
+  };
+  swapDevices = [ { device = "/dev/disk/by-label/swap"; }];
+}