servers/machines/lebesgue/config/hardware-configuration.nix

{
  config,
  lib,
  pkgs,
  modulesPath,
  ...
}: {
  imports = [
    (modulesPath + "/profiles/qemu-guest.nix")
  ];

  services.qemuGuest.enable = true;

  boot.initrd.availableKernelModules = ["ata_piix" "uhci_hcd" "virtio_pci" "sr_mod" "virtio_blk"];
  boot.initrd.kernelModules = [];
  boot.kernelModules = [];
  boot.extraModulePackages = [];
  boot.supportedFilesystems = ["btrfs"];

  boot.initrd.postDeviceCommands = lib.mkAfter ''
    mkdir /btrfs_tmp
    mount /dev/disk/by-label/NIXROOT /btrfs_tmp
    if [[ -e /btrfs_tmp/root ]]; then
        mkdir -p /btrfs_tmp/old_roots
        timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
        mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
    fi

    delete_subvolume_recursively() {
        IFS=$'\n'
        for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
            delete_subvolume_recursively "/btrfs_tmp/$i"
        done
        btrfs subvolume delete "$1"
    }

    for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
        delete_subvolume_recursively "$i"
    done

    btrfs subvolume create /btrfs_tmp/root
    umount /btrfs_tmp
  '';

  fileSystems."/" = {
    device = "/dev/disk/by-label/NIXROOT";
    fsType = "btrfs";
    options = ["subvol=root" "defaults" "noatime" "compress=zstd:1" "discard=async" "nodatacow"];
  };

  fileSystems."/nix" = {
    device = "/dev/disk/by-label/NIXROOT";
    fsType = "btrfs";
    neededForBoot = true;
    options = ["subvol=nix" "defaults" "noatime" "compress=zstd:3" "discard=async" "nodatacow"];
  };

  fileSystems."/persist" = {
    device = "/dev/disk/by-label/NIXROOT";
    fsType = "btrfs";
    neededForBoot = true;
    options = ["subvol=persist" "defaults" "noatime" "compress=zstd:1" "discard=async" "nodatacow"];
  };

  fileSystems."/boot" = {
    device = "/dev/disk/by-label/NIXBOOT";
    fsType = "vfat";
    options = ["fmask=0077" "dmask=0077"];
  };

  swapDevices = [];

  networking.useDHCP = lib.mkDefault true;

  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
}