# nix run github:nix-community/disko -- --mode create ./disko-config-chungus.nix --dry-run
# nix run github:nix-community/disko -- --mode mount ./disko-config-chungus.nix --dry-run
# nixos-generate-config --root /mnt/
# vim /mnt/configuration.nix
# nixos-install --root /mnt

{ raid_disks ? {
    "HITACHI_E3834563CDU11M" = "/dev/disk/by-id/ata-HITACHI_HTS723232A7A364_E3834563CDU11M";
    "HITACHI_E3834563CDU12M" = "/dev/disk/by-id/ata-HITACHI_HTS723232A7A364_E3834563CDU12M";
    "HITACHI_E3834563CDU13M" = "/dev/disk/by-id/ata-HITACHI_HTS723232A7A364_E3834563CDU13M";
    "HITACHI_E3834563CDU15M" = "/dev/disk/by-id/ata-HITACHI_HTS723232A7A364_E3834563CDU15M";
    "HITACHI_E3834563CDU17M" = "/dev/disk/by-id/ata-HITACHI_HTS723232A7A364_E3834563CDU17M";
  }
, ...
}: {
  disko.devices = {
    disk = {
      root = {
        type = "disk";
        device = "/dev/nvme0n1";
        content = {
          type = "table";
          format = "gpt";
          partitions = [
            {
              type = "partition";
              name = "ESP";
              start = "0";
              end = "500MiB";
              bootable = true;
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [
                  "defaults"
                ];
              };
            }
            {
              name = "zfs";
              start = "500MiB";
              end = "100%";
              content = {
                type = "luks";
                name = "root";
                #keyFile = "/tmp/secret.key";
                content = {
                  type = "zfs";
                  pool = "zroot";
                };
              };
            }
          ];
        };
      };
    } // mapAttrs
      (name: device_path:
        {
          name = name;
          value = {
            type = "disk";
            device = device_path;
            content = {
              type = "table";
              format = "gpt";
              partitions = [
                {
                  name = "zfs";
                  start = "0";
                  end = "100%";
                  content = {
                    type = "luks";
                    name = "raid_${name}";
                    #keyFile = "/tmp/secret.key";
                    content = {
                      type = "zfs";
                      pool = "zraid";
                    };
                  };
                }
              ];
            };
          };
        }
      )
      raid_disks;

    zpool = {

      zroot = {
        type = "zpool";
        datasets = {
          "root" = {
            type = "zfs_fs";
            mountpoint = "/";
          };
        };
      };

      zraid = {
        type = "zpool";
        mode = "raidz2";
        datasets = {
          "media" = {
            type = "zfs_fs";
            mountpoint = "/media";
          };
          "media/nextcloud" = {
            type = "zfs_fs";
            mountpoint = "/media/nextcloud";
            options = {
              # question: is that combination of frequency and keep even possible?
              "com.sun:auto-snapshot" = "false";
              "com.sun:auto-snapshot:daily,keep=32" = "true";
              "com.sun:auto-snapshot:weekly,keep=52" = "true";
              "com.sun:auto-snapshot:montly,keep=24" = "true";
            };
          };
        };
      };

    };

  };
}