.files/nix/disko/tungsten/btrfs.nix

{
  disko.devices = {
    disk = {
      main = {
        type = "disk";
        device = "/dev/sda";
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              size = "500M";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [ "umask=0077" ];
              };
            };

            # Use LUKS for disk encryption
            luks = {
              size = "100%";
              content = {
                type = "luks";
                name = "crypted";
                extraOpenArgs = [ ];
                settings.allowDiscards = true;
                content = {
                  type = "lvm_pv";
                  vg = "pool";
                };
              };
            };
          };
        };
      };
    };

    # Use LVM to create a partition for swap
    lvm_vg = {
      pool = {
        type = "lvm_vg";
        lvs = {
          # Set swap device as resume device
          swap = {
            size = "4G";
            content = {
              type = "swap";
              discardPolicy = "both";
              resumeDevice = true;
            };
          };

          # Use btrfs over ext4 for:
          # - compression
          #   nix store can be shrinked using this feature
          # - more transparent partitions (subvolumes)
          #   no more "I need more space here and not there"
          btrfs = {
            size = "100%";
            content = {
              type = "btrfs";

              mountpoint = "/btrfs-root";

              # # DANGER:
              # # Override existing partition at partition creation
              # extraArgs = ["-f"];

              subvolumes = {
                "/root" = {
                  mountpoint = "/";
                };

                "/home" = {
                  mountOptions = [ "compress=zstd" ];
                  mountpoint = "/home";
                };

                "/nix" = {
                  mountOptions = [
                    "compress=zstd"
                    "noatime"
                  ];
                  mountpoint = "/nix";
                };
              };
            };
          };
        };
      };
    };
  };
}