nix/nixos/hosts/nixos-vm-02/disks.nix

{
  disko.devices = {
    disk = {
      sda = {
        device = "/dev/sda";
        content = {
          type = "table";
          format = "gpt";
          partitions = [
          {
            name = "BOOT";
            label = "BOOT";
            start = "0%";
            end = "550MiB";
            bootable = true;
            flags = [ "esp" ];
            fs-type = "fat32";
            content = {
              type = "filesystem";
              format = "vfat";
              mountpoint = "/boot";
            };
          }
          {
            name = "ROOT";
            label = "ROOT";
            size = "100%";
            content = {
              type = "luks";
              name = "LUKS-ROOT";
              extraOpenArgs = [ "--allow-discards" ];
              settings.keyFile = "/tmp/secret.key";
              content = {
                type = "btrfs";
                extraArgs = [ "-f" ];
                subvolumes = {
                  "/root" = {
                    mountpoint = "/";
                    mountOptions = [ "compress=zstd" "noatime" ];
                  };
                  "/home" = {
                    mountpoint = "/home";
                    mountOptions = [ "compress=zstd" "noatime" ];
                  };
                  "/nix" = {
                    mountpoint = "/nix";
                    mountOptions = [ "compress=zstd" "noatime" ];
                  };
                };
              };
            }
          ];
        };
      };
    };
  };
}