let
  jsonConfig = builtins.fromJSON (builtins.readFile ./config.json);
in {
  disko.devices = {
    disk = {
      main = {
        type = "disk";
        device = jsonConfig.rootDevice;
        content = {
          type = "gpt";
          partitions = {
            bios = {
              size = "1M";
              type = "EF02"; # for GRUB BIOS boot
              priority = 1;
            };
            esp = {
              size = "512M";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = ["defaults" "umask=0077"];
              };
            };
            root = {
              size = "100%";
              content = {
                type = "filesystem";
                format = "ext4";
                mountpoint = "/";
                mountOptions = ["noatime" "nodiratime" "discard"];
              };
            };
          };
        };
      };
    };
  };
}