# Legacy storage configuration for emergent
# This file manually defines ZFS datasets matching the existing on-disk layout
# to allow incremental migration to the new storage module (generateBase = true).
#
# Current on-disk dataset layout:
#   rpool/local/                    - parent (canmount=off)
#   rpool/local/system/nix          - nix store
#   rpool/local/system/root         - root filesystem
#
# Migration plan:
#   Phase 1: Rename datasets on disk (boot from live USB)
#     zfs rename -p rpool/local/system/nix rpool/persist/local/nix
#     zfs rename rpool/local rpool/persist/local
#     # This moves: local/system/root -> persist/local/root (need to rename after)
#     # Actually, since local/system/root needs to become persist/local/root:
#     zfs rename rpool/persist/local/system/root rpool/persist/local/root
#     zfs destroy rpool/persist/local/system  # now empty
#     # Recreate blank snapshot:
#     zfs destroy rpool/persist/local/root@blank
#     zfs snapshot rpool/persist/local/root@blank
#
#   Phase 2: Delete this file, remove its import from default.nix, rebuild.
{...}: {
  # Disable automatic base dataset generation so we can define them manually
  storage.generateBase = false;

  # Manually define ZFS datasets matching the existing on-disk layout
  storage.zfs.datasets = {
    "local" = {
      type = "zfs_fs";
      mount = null;
    };
    "local/system/nix" = {
      type = "zfs_fs";
      mount = "/nix";
      atime = "off";
      relatime = "off";
      snapshot = {
        autoSnapshot = false;
      };
    };
    "local/system/root" = {
      type = "zfs_fs";
      mount = "/";
      snapshot = {
        blankSnapshot = true;
        autoSnapshot = true;
      };
    };
  };
}