phundrak
ba018ef841
Configuration is now held by the `.org` files. All `.nix` files are tangled from the org-mode files.
1.6 KiB
ZFS Support
ZFS Support
Enabling ZFS is quite straightforward on my machines. In my module
nixos.zfs, I expose two options: which ZFS pools to import, and
whether to force-import the root pool. But first, here’s the skeleton
of my module.
{
flake.modules.nixos.zfs = {
lib,
config,
...
}:
with lib; let
cfg = config.mySystem.boot;
in {
<<options>>
<<enable>>
<<pools>>
<<force-import-root>>
};
}The main option is the list of pools, which I pass directly to the standard NixOS configuration.
options.mySystem.boot.zfs = {
pools = mkOption {
type = types.listOf types.str;
default = [];
};
forceImportRoot = mkEnableOption "Force-import the ZFS root pool at boot, even if it looks already imported elsewhere";
};Now, I can enable ZFS on the system importing the current module.
config.boot.supportedFilesystems = ["zfs"];And lastly, passing the list of pools to the standard NixOS option is quite simple.
config.boot.zfs.extraPools = cfg.zfs.pools;Force-importing the root pool can paper over a stale or mismatched host ID, but it also risks mounting a pool that’s already imported elsewhere and corrupting it, so NixOS is moving to disable it by default. I’d rather keep that safety and only turn it back on for the rare host (or the rare boot) that actually needs it.
config.boot.zfs.forceImportRoot = cfg.zfs.forceImportRoot;