3 files changed, 222 insertions, 0 deletions
diff --git a/hardware/pc/default.nix b/hardware/pc/default.nix
new file mode 100644
index 0000000..15d6b76
--- /dev/null
+++ b/hardware/pc/default.nix
@@ -0,0 +1,6 @@
+{ ... }:
+{
+  imports = [ ./hardware.nix ];
+
+  boot.loader.timeout = 5;
+}
diff --git a/hardware/pc/disks.nix b/hardware/pc/disks.nix
new file mode 100644
index 0000000..06db9f4
--- /dev/null
+++ b/hardware/pc/disks.nix
@@ -0,0 +1,176 @@
+{ config, lib, inputs, pkgs, modulesPath, isIso, ... }:
+let
+  HDD = "/dev/disk/by-id/nvme-WD_BLACK_SN770_1TB_2251AD458811";
+
+  partitionsCreateScript = ''
+    parted -s "${HDD}" mklabel gpt
+    parted -s "${HDD}" mkpart "efi" fat32 1024KiB 64M
+    parted -s "${HDD}" set 1 esp on
+    parted -s -a optimal "${HDD}" mkpart  "boot" 64M 264M
+    parted -s -a optimal "${HDD}" mkpart "root" 264M 100%
+
+    udevadm trigger --subsystem-match=block; udevadm settle
+  '';
+  partitionsFormatScript = ''
+    mkfs.vfat "${HDD}"-part1
+    cryptsetup -q luksFormat "${HDD}"-part2  --type luks1
+    cryptsetup open --type luks "${HDD}"-part2 encrypted_boot
+    mkfs.ext4 /dev/mapper/encrypted_boot
+    cryptsetup close encrypted_boot
+    cryptsetup -q luksFormat "${HDD}"-part3  --type luks2
+    cryptsetup open --type luks "${HDD}"-part3 encrypted_root
+    pvcreate /dev/mapper/encrypted_root
+    vgcreate encrypted_root_pool /dev/mapper/encrypted_root
+    lvcreate -L 4G -n persist encrypted_root_pool
+    mkfs.btrfs -f /dev/mapper/encrypted_root_pool-persist
+    lvcreate -L 128G -n nix encrypted_root_pool
+    mkfs.btrfs -f /dev/mapper/encrypted_root_pool-nix
+    lvcreate -l 100%FREE -n home encrypted_root_pool
+    mkfs.btrfs -f /dev/mapper/encrypted_root_pool-home
+    vgchange -a n encrypted_root_pool
+    cryptsetup close encrypted_root
+  '';
+  partitionsMountScript = ''
+    mount -t tmpfs none /mnt
+    mkdir -p /mnt/{boot,nix,persist,home}
+
+    cryptsetup open --type luks /dev/disk/by-partlabel/boot encrypted_boot
+    mount /dev/mapper/encrypted_boot /mnt/boot
+    mkdir -p /mnt/boot/efi
+    mount /dev/disk/by-partlabel/efi /mnt/boot/efi
+    cryptsetup open --type luks /dev/disk/by-partlabel/root encrypted_root
+    vgchange -ay encrypted_root_pool
+    mount -o compress-force=zstd /dev/mapper/encrypted_root_pool-home /mnt/home
+    mount -o compress-force=zstd,noatime /dev/mapper/encrypted_root_pool-persist /mnt/persist
+    mount -o compress-force=zstd,noatime /dev/mapper/encrypted_root_pool-nix /mnt/nix
+  '';
+
+  # Utility to save a snapshot of the root tree
+  save-root = pkgs.writers.writeDashBin "save-root" ''
+    ${pkgs.findutils}/bin/find \
+      / -xdev \( -path /tmp -o -path /var/tmp -o -path /var/log/journal \) \
+      -prune -false -o -print0 | sort -z | tr '\0' '\n' > "$1"
+  '';
+
+  # Utility to compare the root tree
+  diff-root = pkgs.writers.writeDashBin "diff-root" ''
+    export PATH=${with pkgs; lib.makeBinPath [ diffutils less ]}:$PATH
+    current="$(mktemp current-root.XXX --tmpdir)"
+    trap 'rm "$current"' EXIT INT HUP
+    ${save-root}/bin/save-root "$current"
+    diff -u /run/initial-root "$current" --color=always | ''${PAGER:-less -R}
+  '';
+in
+{
+  config = {
+
+    environment.persistence."/persist" = {
+      directories = [
+        "/var/log"
+        "/var/lib"
+        "/root"
+      ];
+      files = [
+        "/etc/machine-id"
+        "/etc/nix/id_rsa"
+        "/etc/ssh/ssh_host_rsa_key"
+        "/etc/ssh/ssh_host_rsa_key.pub"
+        "/etc/ssh/ssh_host_ed25519_key"
+        "/etc/ssh/ssh_host_ed25519_key.pub"
+      ];
+    };
+
+    fileSystems."/" = {
+      device = "none";
+      fsType = "tmpfs";
+      options = [ "defaults" "mode=755" ];
+    };
+
+    boot.initrd.luks.devices."encrypted_boot" = {
+      device = "/dev/disk/by-partlabel/boot";
+      preLVM = true;
+    };
+
+    fileSystems."/boot" = {
+      device = "/dev/mapper/encrypted_boot";
+      fsType = "ext4";
+    };
+
+    fileSystems."/boot/efi" = {
+      device = "/dev/disk/by-partlabel/efi";
+      fsType = "vfat";
+    };
+
+    boot.initrd.luks.devices."encrypted_root".device = "/dev/disk/by-partlabel/root";
+
+    fileSystems."/nix" = {
+      device = "/dev/mapper/encrypted_root_pool-nix";
+      fsType = "btrfs";
+      neededForBoot = true;
+      options = [ "compress-force=zstd" "noatime" ];
+    };
+
+    fileSystems."/persist" = {
+      device = "/dev/mapper/encrypted_root_pool-persist";
+      fsType = "btrfs";
+      neededForBoot = true;
+      options = [ "compress-force=zstd" "noatime" ];
+    };
+
+    fileSystems."/home" = {
+      device = "/dev/mapper/encrypted_root_pool-home";
+      fsType = "btrfs";
+      options = [ "compress-force=zstd" ];
+    };
+
+    swapDevices = [ ];
+
+    services.btrfs.autoScrub.enable = true;
+
+    zramSwap.enable = true;
+
+
+    environment.systemPackages = [
+      config.disks-create
+      config.disks-format
+      config.disks-mount
+
+      diff-root
+    ];
+
+    systemd.services.save-root-snapshot = {
+      description = "save a snapshot of the initial root tree";
+      wantedBy = [ "sysinit.target" ];
+      requires = [ "-.mount" ];
+      after = [ "-.mount" ];
+      serviceConfig.Type = "oneshot";
+      serviceConfig.RemainAfterExit = true;
+      serviceConfig.ExecStart = ''${save-root}/bin/save-root /run/initial-root'';
+    };
+  };
+
+  options.disks-create = with lib; mkOption rec {
+    type = types.package;
+    default = with pkgs; symlinkJoin {
+      name = "disks-create";
+      paths = [ (writeScriptBin default.name partitionsCreateScript) parted ];
+    };
+  };
+
+  options.disks-format = with lib; mkOption rec {
+    type = types.package;
+    default = with pkgs; symlinkJoin {
+      name = "disks-format";
+      paths = [ (writeScriptBin default.name partitionsFormatScript) cryptsetup lvm2 dosfstools e2fsprogs btrfs-progs ];
+    };
+  };
+
+  options.disks-mount = with lib; mkOption rec {
+    type = types.package;
+    default = with pkgs; symlinkJoin {
+      name = "disks-mount";
+      paths = [ (writeScriptBin default.name partitionsMountScript) cryptsetup lvm2 ];
+    };
+  };
+
+}
diff --git a/hardware/pc/hardware.nix b/hardware/pc/hardware.nix
new file mode 100644
index 0000000..b8c7fa1
--- /dev/null
+++ b/hardware/pc/hardware.nix
@@ -0,0 +1,40 @@
+{ config, lib, inputs, pkgs, modulesPath, ... }:
+let
+  powerMode = "performance";
+in
+{
+  imports = [
+    ./disks.nix
+    "${modulesPath}/profiles/all-hardware.nix"
+  ];
+
+  boot = {
+    initrd = {
+      availableKernelModules = [ "xhci_pci" "usb_storage" "sd_mod" "sdhci_acpi" "aesni_intel" "cryptd" ];
+      kernelModules = [ ];
+    };
+    kernelPackages = pkgs.linuxPackages_latest;
+    kernelModules = [ "kvm_intel" "amdgpu" ];
+    extraModulePackages = [ ];
+    kernelParams = [ "boot.shell_on_fail" "net.ifnames=0" "biosdevname=0" "iomem=relaxed" "mitigations=off" ];
+  };
+
+  powerManagement.cpuFreqGovernor = powerMode;
+
+  services = {
+    xserver = {
+      videoDrivers = [ "amdgpu" ];
+    };
+    fstrim.enable = true;
+  };
+
+  hardware = {
+    cpu.intel.updateMicrocode = true;
+
+    opengl = {
+      enable = true;
+      driSupport = true;
+    };
+  };
+
+}